Dentistry/Dental AST. Simulation Examination 8
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Premolars and molars are used for _____ food.
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Tearing
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Cutting
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Grinding
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All of the above
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This is a Simulated Examination for Gulf Dentistry/Dental Ast Examinations taken from Last Month's HAAD Feedbacks.
This examination contains 100 of the most UPDATED EXAMS from Abu Dhabi, KSA, and UAE.
Take this examination for 120 minutes. You need to get 86% to pass the HAAD. 60% to pass MOH, DHA, or Prometrics.
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- 2.
Permanent maxillary molars have _____ roots.
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Three
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Four
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Two
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One
Correct Answer
A. ThreeExplanation
Permanent maxillary molars typically have three roots. This is a common characteristic of these molars, with each root providing stability and support to the tooth. The three roots are known as the mesiobuccal, distobuccal, and palatal roots. They are positioned in different directions, allowing for effective anchorage and distribution of forces during chewing and biting. The presence of three roots in permanent maxillary molars helps ensure their long-term durability and functionality.Rate this question:
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- 3.
In the Universal Numbering System, the maxillary permanent premolars are:
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#4, #5, #12, and #13.
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#14, #15, #24, and #25.
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#20, #21, #28, and #29.
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#34, #35, #44, and #45.
Correct Answer
A. #14, #15, #24, and #25. -
- 4.
There are ___ teeth in a quadrant of the primary dentition.
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5
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10
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20
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8
Correct Answer
A. 5Explanation
In the primary dentition, there are usually 20 teeth in total, with 10 teeth in each arch. A quadrant refers to one-fourth of the mouth, so in a quadrant of the primary dentition, there would be half of the total number of teeth in that arch. Therefore, in a quadrant of the primary dentition, there would be 5 teeth.Rate this question:
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- 5.
How many canines are in a quadrant of the permanent dentition?
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1
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2
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4
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8
Correct Answer
A. 1Explanation
In the permanent dentition, there is only one canine tooth in each quadrant. Canine teeth are the pointed teeth located on either side of the incisors, and they are used for tearing and grasping food. Therefore, the correct answer is 1.Rate this question:
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- 6.
There are _____ molars in the permanent dentition.
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8
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14
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16
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12
Correct Answer
A. 12Explanation
The permanent dentition refers to the set of teeth that replace the primary or baby teeth. In the permanent dentition, there are a total of 12 molars. Molars are the larger, flatter teeth located at the back of the mouth, used for grinding and chewing food.Rate this question:
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- 7.
Canines are also referred to as:
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Wisdom teeth.
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Eyeteeth.
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Cuspids.
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Both b and c.
Correct Answer
A. Both b and c.Explanation
Canines are the sharp, pointed teeth located on either side of the incisors in humans and other mammals. They are also commonly referred to as "eyeteeth" or "cuspids." Therefore, the correct answer is "both b and c" since both terms are used to describe canines.Rate this question:
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- 8.
Characteristics of the primary dentition include:
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Darker enamel.
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Relatively thicker enamel.
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Relatively large pulp chambers.
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A tooth crown that is longer in relation to the total tooth length.
Correct Answer
A. Relatively large pulp chambers.Explanation
The primary dentition refers to the set of baby teeth that children have before their permanent teeth come in. One of the characteristics of primary dentition is relatively large pulp chambers. The pulp chamber is the hollow space inside the tooth that contains blood vessels and nerves. In primary teeth, the pulp chambers are larger compared to permanent teeth because the primary teeth are smaller in size. This is important for the development and vitality of the primary teeth as they play a crucial role in chewing and speech development during childhood.Rate this question:
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- 9.
The first premolar is posterior to the _____ while the second premolar is anterior to the _____.
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Lateral incisor, second molar
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Canine, first molar
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Second premolar, first molar
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Canine, first premolar
Correct Answer
A. Canine, first molarExplanation
The first premolar is located behind the canine tooth and in front of the first molar. Similarly, the second premolar is located behind the first molar. Therefore, the first premolar is posterior to the canine and the second premolar is anterior to the first molar.Rate this question:
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- 10.
The bony ridge over the labial portion of the roots of the canines that helps to form the facial contours is the:
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Cusp.
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Canus.
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Imbrication line.
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Canine eminence.
Correct Answer
A. Canine eminence.Explanation
The correct answer is canine eminence. The canine eminence refers to the bony ridge over the labial portion of the roots of the canines. It helps to form the facial contours, giving the face a more defined appearance. The cusp is a pointed or rounded projection on the crown of a tooth, not related to the bony ridge. Canus is not a dental term, and imbrication line refers to the overlapping of enamel rods, not the bony ridge over the roots of canines.Rate this question:
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- 11.
The _____ often appear as a developmental anomaly, differing in size, shape, contour, and relative position.
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Maxillary central incisors
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Mandibular incisors
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Maxillary and mandibular third molars
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Mandibular first and second molars
Correct Answer
A. Maxillary and mandibular third molarsExplanation
The maxillary and mandibular third molars often appear as a developmental anomaly, differing in size, shape, contour, and relative position.Rate this question:
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- 12.
Most maxillary first premolars are considered to be ______ because they have a root that is divided into two roots.
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Bifurcated
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Succedaneous
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Trifurcated
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Bicanineate
Correct Answer
A. BifurcatedExplanation
Most maxillary first premolars are considered to be bifurcated because they have a root that is divided into two roots. This means that the root of the tooth splits into two separate branches, which is a common characteristic of maxillary first premolars.Rate this question:
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- 13.
A mandibular canine tooth:
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Usually erupts before the maxillary canine.
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Has a larger and more developed cusp than the maxillary canine.
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Has a sharper cusp tip than a maxillary canine.
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Has a sharper cusp tip than a maxillary canine.
Correct Answer
A. Usually erupts before the maxillary canine.Explanation
Mandibular canine tooth usually erupts before the maxillary canine because the mandibular arch develops and erupts earlier than the maxillary arch. This is a common pattern in tooth eruption, where the lower teeth tend to erupt before the upper teeth. The timing of eruption is influenced by various factors such as genetic factors, jaw size, and tooth development.Rate this question:
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- 14.
The difference(s) between the maxillary and mandibular central incisors is(are):
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Maxillary central incisors are larger than the mandibular central incisors in all dimensions.
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Labial surfaces of the maxillary central incisors are more rounded from the incisal aspect than those of the mandibular central incisors.
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Cingulum in less prominent on the maxillary central incisors than the cingulum on the mandibular central incisors.
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Both a and b.
Correct Answer
A. Both a and b.Explanation
The correct answer is "both a and b." This means that both statements a and b are true. Statement a states that the maxillary central incisors are larger than the mandibular central incisors in all dimensions. Statement b states that the labial surfaces of the maxillary central incisors are more rounded from the incisal aspect than those of the mandibular central incisors. Therefore, the difference between the maxillary and mandibular central incisors is that the maxillary ones are larger and have more rounded labial surfaces.Rate this question:
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- 15.
The developmental groove that extends mesiodistally and divides the occlusal table in half is the _____ groove.
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Marginal
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Triangular
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Central
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None of the above
Correct Answer
A. MarginalExplanation
The correct answer is "marginal." The explanation for this is that the marginal groove is a developmental groove that extends mesiodistally and divides the occlusal table in half. It is located near the marginal ridge of the tooth and helps to separate the cusps or lobes of the tooth. The other options, triangular and central, do not accurately describe the groove that is being referred to in the question.Rate this question:
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- 16.
The cusp of Carabelli is found on the:
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Premolars.
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Central incisors.
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Maxillary first molars.
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Maxillary second molars.
Correct Answer
A. Maxillary first molars.Explanation
The cusp of Carabelli is a small additional cusp found on the mesiolingual aspect of the maxillary first molars. It is not present on premolars, central incisors, or maxillary second molars.Rate this question:
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- 17.
The _____ are sometimes referred to as “wisdom” teeth.
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First molars
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Premolars
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Third molars
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Canines
Correct Answer
A. Third molarsExplanation
The third molars are sometimes referred to as "wisdom" teeth.Rate this question:
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- 18.
The mandibular lateral incisors are:
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Larger than the maxillary lateral incisors.
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Larger than the mandibular central incisors.
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Larger than the mandibular canines.
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Smaller than the mandibular central incisors.
Correct Answer
A. Larger than the mandibular central incisors.Explanation
The mandibular lateral incisors are larger than the mandibular central incisors. This is a characteristic feature of the mandibular teeth, where the lateral incisors are slightly larger in size compared to the central incisors.Rate this question:
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- 19.
The incisal surface of an anterior tooth is also known as the:
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Facial surface.
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Labial surface.
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Incisal edge.
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Incisal ridge.
Correct Answer
A. Incisal edge.Explanation
The incisal surface of an anterior tooth refers to the biting edge of the tooth, which is used for cutting and tearing food. This term specifically applies to the front teeth, known as incisors. The other options mentioned, such as facial surface and labial surface, refer to the outer surface of the tooth, while incisal ridge refers to the curved ridge on the cutting edge of the tooth. Therefore, the correct term for the biting edge of an anterior tooth is the incisal edge.Rate this question:
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- 20.
The largest and strongest teeth in the maxillary dentition are the maxillary:
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First molars.
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Second molars.
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Canines
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Central incisors.
Correct Answer
A. First molars.Explanation
The first molars are the largest and strongest teeth in the maxillary dentition. They are located towards the back of the mouth and have a larger surface area and stronger roots compared to other teeth. These molars are designed for grinding and chewing food, making them essential for proper digestion.Rate this question:
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- 21.
In the Universal Numbering System, the four first permanent molars are:
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#16, #26, #36, and #46.
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#3, #14, #19, and #30.
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#2, #15, #18, and #31.
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#18, #28, #38, and #48.
Correct Answer
A. #3, #14, #19, and #30. -
- 22.
A common anomaly of the maxillary lateral incisors that is characterized by the tooth being abnormally pointed or tapered in shape is called:
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Barrel laterals.
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Fused laterals.
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Pegged laterals.
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Dens in dente.
Correct Answer
A. Pegged laterals.Explanation
Pegged laterals refer to a common anomaly of the maxillary lateral incisors where the tooth is abnormally pointed or tapered in shape. This condition is characterized by the tooth resembling a peg or a small cone. It is a dental term used to describe the shape of these teeth and is often seen as a cosmetic concern.Rate this question:
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- 23.
The maxillary second premolar differs from the maxillary first premolar in that the:
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Distobuccal cusp slope is shorter than the mesiobuccal cusp slope on the second premolar.
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Cusps of the maxillary first premolar are not as sharp as the maxillary second premolar.
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Second premolar has only one root, and therefore only one root canal.
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Second premolar is wider mesiodistally than buccolingually.
Correct Answer
A. Second premolar has only one root, and therefore only one root canal.Explanation
The maxillary second premolar differs from the maxillary first premolar in that it has only one root, and therefore only one root canal. This is in contrast to the maxillary first premolar, which typically has two roots and two root canals.Rate this question:
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- 24.
The primary dentition has _____ molars and _____ premolars.
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12; 8
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8; 0
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8; 4
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4; 4
Correct Answer
A. 8; 0Explanation
The primary dentition refers to the set of teeth that a child has before their permanent teeth erupt. In the primary dentition, there are a total of 20 teeth. These include 8 molars and 0 premolars. Molars are the larger, flatter teeth towards the back of the mouth, while premolars are the smaller teeth that come after the canines. Therefore, the correct answer is 8 molars and 0 premolars.Rate this question:
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- 25.
The _____ premolar has two bifurcated roots.
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Mandibular first
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Maxillary first
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Maxillary second
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Mandibular second
Correct Answer
A. Maxillary firstExplanation
The maxillary first premolar is the correct answer because it is the only premolar in the given options that has two bifurcated roots. Bifurcated means divided into two branches or forks, and the maxillary first premolar typically has a mesial and a distal root. The mandibular premolars, on the other hand, usually have one root.Rate this question:
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- 26.
The permanent _____ replace the primary first and second molars.
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First molars
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First and second molars
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Premolars
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Canines
Correct Answer
A. PremolarsExplanation
The permanent premolars replace the primary first and second molars. This is because the premolars are the teeth that come after the primary molars in the dental development sequence. As the primary molars are shed, the permanent premolars erupt to take their place.Rate this question:
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- 27.
The raised border on the mesial and distal surfaces of the lingual surface of anterior teeth is the:
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Fossa.
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Cingulum.
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Marginal ridge.
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Mamelon
Correct Answer
A. Marginal ridge.Explanation
The raised border on the mesial and distal surfaces of the lingual surface of anterior teeth is known as the marginal ridge. The marginal ridge helps to define the shape and contour of the tooth, providing support and stability to the adjacent teeth. It also helps in the proper alignment and occlusion of the teeth during biting and chewing. The other options, such as fossa, cingulum, and mamelon, do not accurately describe the raised border on the mesial and distal surfaces of the lingual surface of anterior teeth.Rate this question:
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- 28.
There are how many incisors in each arch of the permanent dentitions?
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2
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4
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6
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8
Correct Answer
A. 4Explanation
In each arch of the permanent dentitions, there are four incisors. Incisors are the front teeth that are used for cutting and biting food. They are located in the front of the mouth and are typically the first teeth to erupt in both the upper and lower jaws. The four incisors in each arch include two central incisors and two lateral incisors.Rate this question:
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- 29.
The maxillary second premolar differs from the maxillary first premolar in that the:
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First premolar is more narrow buccolingually than mesiodistally.
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Cusps of second premolars are not as sharp as those of first premolars.
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Lingual cusp is smaller than the buccal cusp on the maxillary second premolar.
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All of the above.
Correct Answer
A. Cusps of second premolars are not as sharp as those of first premolars.Explanation
The cusps of second premolars are not as sharp as those of first premolars. This means that the cusps on the second premolar are less pointed or tapered compared to the cusps on the first premolar. This difference in cusp shape is a distinguishing characteristic between these two teeth.Rate this question:
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- 30.
There are how many premolars in the permanent dentition?
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2
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4
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6
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8
Correct Answer
A. 8Explanation
In the permanent dentition, there are a total of 8 premolars. Premolars are the teeth located between the canines and molars in each quadrant of the mouth. They are used for chewing and grinding food.Rate this question:
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- 31.
There are no ______ in the primary dentition.
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Molars
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Canines
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Premolars
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Incisors
Correct Answer
A. PremolarsExplanation
In the primary dentition, which refers to the set of teeth that children have before their permanent teeth come in, there are no premolars. Premolars are the teeth that come after the canines and before the molars. However, in the primary dentition, the teeth consist of incisors, canines, and molars.Rate this question:
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- 32.
A _____ is a pinpoint depression in the occlusal surface of a posterior tooth where two or more grooves meet.
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Fossa
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Pit
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Fissure
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Developmental groove
Correct Answer
A. PitExplanation
A pit is a pinpoint depression in the occlusal surface of a posterior tooth where two or more grooves meet. It is a small, shallow area that can collect food debris and bacteria, making it susceptible to decay. Pits are often found in molars and premolars and can be difficult to clean properly with regular brushing and flossing. Therefore, pits are prone to developing cavities and may require dental treatment to prevent further damage to the tooth.Rate this question:
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- 33.
An unusually large space between adjacent teeth is known as a:
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Fossa.
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Mamelon.
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Cusp.
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Diastema.
Correct Answer
A. Diastema.Explanation
A diastema refers to an unusually large space between adjacent teeth. It is a condition that can occur due to various reasons such as tooth loss, undersized teeth, or an oversized labial frenum. This gap can be seen most commonly between the two upper front teeth but can also occur in other areas of the mouth. Treatment options for a diastema include orthodontic treatment, dental bonding, or dental veneers.Rate this question:
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- 34.
The root of the mandibular second premolar is ______ than that of a mandibular first premolar, but ______ than the roots of the maxillary premolars.
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Smaller; longer
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Longer; shorter
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Smaller; shorter
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Shorter; longer
Correct Answer
A. Longer; shorterExplanation
The root of the mandibular second premolar is longer than that of a mandibular first premolar, but shorter than the roots of the maxillary premolars.Rate this question:
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- 35.
The root of the maxillary lateral incisor:
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Is the same width as the root of the maxillary central incisor.
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Is a bifurcated root.
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May curve slightly to the distal.
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Is the same size as the root of the mandibular lateral incisor.
Correct Answer
A. May curve slightly to the distal.Explanation
The correct answer is that the root of the maxillary lateral incisor may curve slightly to the distal. This means that the root of this tooth, which is located in the upper jaw, may have a slight curvature towards the back of the mouth. This is a common anatomical variation and is important to consider when performing dental procedures or treatments involving this tooth.Rate this question:
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- 36.
The _____ are the longest teeth in the permanent dentition and are known as the cornerstone of the dental arches.
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Canines
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Central incisors
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Lateral incisors
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Molars
Correct Answer
A. CaninesExplanation
The canines are the longest teeth in the permanent dentition and are known as the cornerstone of the dental arches. They have a pointed shape and are located on either side of the incisors. Canines play an important role in biting and tearing food, as well as providing support and stability to the dental arches.Rate this question:
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- 37.
The smallest teeth in the permanent dentition are the:
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Maxillary lateral incisors.
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Mandibular central incisors.
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Mandibular canines.
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Maxillary central incisors.
Correct Answer
A. Mandibular central incisors.Explanation
The mandibular central incisors are the smallest teeth in the permanent dentition. This is because they are located in the front of the mouth and are generally smaller in size compared to other teeth. The maxillary lateral incisors and maxillary central incisors are larger in size, while the mandibular canines are also larger and have a more pointed shape. Therefore, the mandibular central incisors are the correct answer as they are the smallest teeth in the permanent dentition.Rate this question:
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- 38.
Using the Universal/National Teeth-Numbering System, what are the numbers for the permanent third molars?
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1, 2, 3, 4
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3, 14, 19, 30
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1, 16, 17, 32
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2, 15, 18, 31
Correct Answer
A. 1, 16, 17, 32Explanation
The correct answer is 1, 16, 17, 32. The Universal/National Teeth-Numbering System assigns specific numbers to each tooth in the mouth. In this system, the permanent third molars are numbered as 1, 16, 17, and 32.Rate this question:
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- 39.
The third molars and the _____ vary in form more than any other teeth in the mouth.
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Mandibular canines
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Maxillary lateral incisors
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Maxillary central incisors
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Second molars
Correct Answer
A. Maxillary lateral incisorsExplanation
The third molars and the maxillary lateral incisors vary in form more than any other teeth in the mouth. This means that these two types of teeth have the most variation in their shape and appearance compared to all the other teeth.Rate this question:
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- 40.
The size, shape, color, and position of the _____ directly relate to how a person looks.
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Posterior teeth
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Molars
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Anterior teeth
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Premolars
Correct Answer
A. Anterior teethExplanation
The size, shape, color, and position of the anterior teeth directly relate to how a person looks. The anterior teeth, which include the incisors and canines, are the front teeth that are visible when a person smiles or speaks. These teeth play a crucial role in the aesthetics of a person's smile and overall facial appearance. The size, shape, color, and position of these teeth can greatly impact the symmetry, balance, and attractiveness of a person's face.Rate this question:
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- 41.
Which of the following adult teeth is nonsuccedaneous?
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Maxillary right canine
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Maxillary left second premolar
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Mandibular right lateral incisor
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Mandibular left second molar
Correct Answer
A. Mandibular left second molarExplanation
The mandibular left second molar is the correct answer because it is a permanent tooth that does not replace a primary (baby) tooth. Nonsuccedaneous teeth are permanent teeth that do not have primary predecessors. The other options listed in the question are succedaneous teeth, which means they replace primary teeth.Rate this question:
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- 42.
The rounded enamel extensions on the incisal ridge of newly erupted central and lateral incisors are called:
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Mamelons.
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A fossa.
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A cingulum.
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A marginal ridge.
Correct Answer
A. Mamelons.Explanation
Mamelons are rounded enamel extensions found on the incisal ridge of newly erupted central and lateral incisors. They are commonly seen in children and gradually wear down over time. Mamelons are considered a normal anatomical feature and are not present in all individuals. They can sometimes be mistaken for chips or fractures in the teeth, but they are actually just natural variations in tooth morphology.Rate this question:
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- 43.
The primary teeth are classified in the Universal/National System using:
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Numbers 1 through 20.
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A number for each quadrant and a number for each tooth.
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Letters A through T.
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Numbers inside a bracket.
Correct Answer
A. Letters A through T.Explanation
The primary teeth are classified in the Universal/National System using letters A through T. This system assigns a letter to each tooth in the mouth, with A being the upper right second molar and T being the lower left second molar. This classification system is widely used in dentistry to easily identify and communicate about specific primary teeth.Rate this question:
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- 44.
The area where the cusp ridges converge at a central point on the occlusal surfaces of posterior teeth is the:
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Triangular fossa.
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Central fossa.
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Central groove
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Triangular groove.
Correct Answer
A. Central fossa.Explanation
The area where the cusp ridges converge at a central point on the occlusal surfaces of posterior teeth is known as the central fossa. This is a depression or concavity in the tooth's surface that is located in the center, where the cusps come together. It is important for proper occlusion and chewing function. The other options, such as triangular fossa and grooves, are not accurate descriptions of this specific area on the occlusal surface.Rate this question:
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- 45.
Which statement is NOT true of the maxillary canines?
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Which statement is NOT true of the maxillary canines?
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The cusp tip is sharper on a maxillary canine than on a mandibular canine.
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The canines have incisal edges similar to other anterior teeth.
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The crown of the maxillary canine is in longer than the crown of the mandibular canine.
Correct Answer
A. The crown of the maxillary canine is in longer than the crown of the mandibular canine.Explanation
The statement "The crown of the maxillary canine is in longer than the crown of the mandibular canine" is not true. The crown of the maxillary canine is typically longer than the crown of the mandibular canine.Rate this question:
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- 46.
Correct contact between adjacent teeth is important because proper contact:
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Helps prevent food from being trapped between the teeth.
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Stabilizes the dental arch by holding teeth in positive contact with each other.
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Protects the interproximal gingival tissue from trauma during chewing.
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Does all of the above.
Correct Answer
A. Does all of the above.Explanation
Proper contact between adjacent teeth is important because it helps prevent food from being trapped between the teeth, stabilizes the dental arch by holding teeth in positive contact with each other, and protects the interproximal gingival tissue from trauma during chewing.Rate this question:
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- 47.
The decidious dentition has some teeth of both dentitions present.
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True
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False
Correct Answer
A. FalseExplanation
The deciduous dentition refers to the set of teeth that are present in young children before their permanent teeth come in. These primary or baby teeth are eventually replaced by the permanent teeth. The statement that "the deciduous dentition has some teeth of both dentitions present" is false because the deciduous dentition only consists of primary teeth and does not include any permanent teeth.Rate this question:
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- 48.
Centric occlusion is the maximum contact between the occluding surfaces of the maxillary and mandibular teeth.
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True
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Falsa
Correct Answer
A. TrueExplanation
Centric occlusion refers to the position where the upper and lower teeth make maximum contact. It is the habitual biting position that allows for proper functioning of the teeth and jaw. In this position, the occluding surfaces of the upper and lower teeth are in their most stable and aligned position. Therefore, the statement that centric occlusion is the maximum contact between the occluding surfaces of the maxillary and mandibular teeth is true.Rate this question:
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- 49.
The mandibular canines are usually the first permanent teeth to erupt in the oral cavity.
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True
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False
Correct Answer
A. FalseExplanation
The mandibular canines are not usually the first permanent teeth to erupt in the oral cavity. The first permanent teeth to erupt are typically the mandibular first molars, which usually appear around the age of 6. The mandibular canines typically erupt after the mandibular first molars, usually around the age of 9-10. Therefore, the statement is false.Rate this question:
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