Oral Anatomy .....1
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Questions and Answers
- 1.
Root completion of all teeth except third molar at the age of?
- A.
14-16 years
- B.
12-13 years
- C.
16-18
- D.
18-21
Correct Answer
A. 14-16 yearsExplanation
The root completion of all teeth except the third molar typically occurs between the ages of 14-16 years. This is the time when the roots of the teeth are fully formed and developed. It is important to note that the third molars, also known as wisdom teeth, may continue to develop and erupt even after this age range.Rate this question:
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- 2.
Tooth with maximum mesiodistal inclination?
- A.
Maxillary central incisor
- B.
Maxillary canine
- C.
Maxillary first premolar
- D.
Maxillary second premolar
Correct Answer
B. Maxillary canineExplanation
The maxillary canine has the maximum mesiodistal inclination among the given options. This means that the maxillary canine is tilted or inclined more towards the mesial (towards the midline of the dental arch) compared to the other teeth listed. The inclination of the maxillary canine allows it to guide the mandibular canine into the proper position during occlusion and helps maintain the proper alignment of the teeth in the dental arch.Rate this question:
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- 3.
Corner stone of dentition?
- A.
Maxillary 2nd molar
- B.
Maxillary 1st molar
- C.
Mandibular canine
- D.
All
Correct Answer
B. Maxillary 1st molarExplanation
The maxillary 1st molar is considered the corner stone of dentition because it is the largest and strongest tooth in the upper jaw. It is the first permanent tooth to erupt in the mouth and plays a crucial role in chewing and grinding food. Its position and size also provide support to the other teeth in the dental arch. Therefore, the maxillary 1st molar is an essential tooth in maintaining proper occlusion and overall dental function.Rate this question:
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- 4.
H shaped grove is seen in?
- A.
3 cusp type mandibularb 2nd premolar
- B.
2 cusp type mandibular 2 nd premolar
- C.
Both
- D.
None
Correct Answer
B. 2 cusp type mandibular 2 nd premolarExplanation
The H-shaped groove is seen in the 2 cusp type mandibular 2nd premolar. This groove pattern resembles the letter "H" and is a characteristic feature of this particular tooth. The presence of this groove helps in identifying and distinguishing this type of premolar from others.Rate this question:
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- 5.
Largest cusp in mandibular 1st molar?
- A.
Distobuccal
- B.
Mesiolingual
- C.
Distobuccal
- D.
Mesiobuccal
Correct Answer
D. MesiobuccalExplanation
The largest cusp in the mandibular first molar is the mesiobuccal cusp.Rate this question:
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- 6.
Largest cusp in maxillary first molar?
- A.
Distolungual
- B.
Mesiolingual
- C.
Mesiobuccal
- D.
Distobuccal
Correct Answer
B. MesiolingualExplanation
The largest cusp in the maxillary first molar is the mesiolingual cusp. This cusp is located on the lingual side of the tooth, towards the mesial (front) aspect. It is larger than the distolingual cusp, mesiobuccal cusp, and distobuccal cusp.Rate this question:
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- 7.
Mesial contact area in distal aspect of canine?
- A.
Middle 3rd
- B.
Junction of incisal and middle third
- C.
Either
- D.
None
Correct Answer
A. Middle 3rdExplanation
The mesial contact area in the distal aspect of the canine is located in the middle third. This means that the contact area is positioned between the incisal third (the area closer to the incisal edge or biting surface) and the apical third (the area closer to the root).Rate this question:
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- 8.
Largest mesiodistal diameter in primary dentition?
- A.
Mandibular 1st molar
- B.
Mandibular 2nd molar
- C.
Maxillary 2 nd molar
- D.
None
Correct Answer
B. Mandibular 2nd molarExplanation
The mandibular second molar has the largest mesiodistal diameter in the primary dentition. This means that it is wider from front to back compared to the other teeth listed. The mandibular first molar is not the correct answer because it is not as wide as the second molar. The maxillary second molar is also not the correct answer because it is not part of the primary dentition. Therefore, the correct answer is the mandibular second molar.Rate this question:
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- 9.
Largest buccolingual dimension in primary dentition?
- A.
Maxillary 1st molar
- B.
Maxillary 2nd molar
- C.
Mandibular 2nd molar
- D.
Mandibular 1st molar
Correct Answer
B. Maxillary 2nd molarExplanation
The maxillary 2nd molar has the largest buccolingual dimension in the primary dentition. This means that it is wider from cheek to tongue compared to the other teeth listed. The maxillary 1st molar, mandibular 2nd molar, and mandibular 1st molar are all smaller in this dimension.Rate this question:
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- 10.
Which is a non supporting cusp?
- A.
Maxillary lingual cusp
- B.
Mandibular buccal cusp
- C.
Maxillary buccal cusp
- D.
None
Correct Answer
C. Maxillary buccal cuspExplanation
The maxillary buccal cusp is a non-supporting cusp because it does not make contact with any opposing teeth. The lingual cusps of the maxillary teeth and the buccal cusps of the mandibular teeth are supporting cusps because they make contact with the opposing teeth during occlusion. Therefore, the maxillary buccal cusp is the correct answer as a non-supporting cusp.Rate this question:
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- 11.
Posterior teeth with minimum mesiodistal inclination?
- A.
Maxillary first molar
- B.
Maxillary 2nd premolar
- C.
Mandibular 1st premolar
- D.
All
Correct Answer
B. Maxillary 2nd premolarExplanation
The maxillary second premolar has the least mesiodistal inclination among the given options. This means that it has the most upright position compared to the other posterior teeth.Rate this question:
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- 12.
Number of point angles in anterior teeth?
- A.
6
- B.
4
- C.
8
- D.
2
Correct Answer
B. 4Explanation
The correct answer is 4. In dentistry, point angles are the angles formed by the junction of two tooth surfaces. Anterior teeth refer to the front teeth, including incisors and canines. These teeth have four point angles: mesioincisal, distoincisal, mesiocervical, and distocervical. Therefore, the correct answer is 4.Rate this question:
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- 13.
Deciduous teeth which doesnot resemble any other teeth?
- A.
Primary maxillary first molar
- B.
Permenant maxillary first molar
- C.
Primary mandibular first molar
- D.
None
Correct Answer
C. Primary mandibular first molarExplanation
The primary mandibular first molar is the correct answer because it is the only tooth listed that is deciduous (baby tooth). Deciduous teeth are the first set of teeth that erupt in a child's mouth and are eventually replaced by permanent teeth. The primary mandibular first molar is unique in its appearance and does not resemble any other teeth. The other options listed are permanent teeth or do not have the same characteristics as the primary mandibular first molar.Rate this question:
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- 14.
Most common curvature of the palatal root of maxillary first molar?
- A.
Distal
- B.
Lingual
- C.
Facial
- D.
Mesial
Correct Answer
C. FacialExplanation
The most common curvature of the palatal root of the maxillary first molar is facial. This means that the root of the tooth curves towards the facial (cheek) side of the mouth. This is a common anatomical variation that can be observed in many individuals.Rate this question:
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- 15.
Most common curvature of palatal root of maxillary first molar ?
- A.
Distal
- B.
Facial
- C.
Mesial
- D.
Lingual
Correct Answer
B. FacialExplanation
The most common curvature of the palatal root of the maxillary first molar is facial. This means that the root of the tooth bends towards the facial (cheek) side of the mouth.Rate this question:
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- 16.
Shortest root in maxillary first molar?
- A.
Mesiobuccal
- B.
Distobuccal
- C.
Lingual
- D.
All
Correct Answer
B. DistobuccalExplanation
The distobuccal root is the shortest root in the maxillary first molar. This root is located towards the back (distal) and on the cheek side (buccal) of the tooth. The mesiobuccal root is located towards the front (mesial) and on the cheek side (buccal) of the tooth. The lingual root is located on the tongue side of the tooth. The option "All" suggests that all of the roots are the shortest, which is not correct. Therefore, the correct answer is the distobuccal root.Rate this question:
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- 17.
Major fossa in permenant maxillary first molar?
- A.
Mesial trangular fossa
- B.
Distal triangular fossa
- C.
Both
- D.
None
Correct Answer
B. Distal triangular fossaExplanation
The distal triangular fossa is a major fossa in the permanent maxillary first molar. Fossae are depressions or grooves on the occlusal surface of the tooth. The distal triangular fossa is located on the distal side of the tooth, towards the back. It is triangular in shape and serves as a space for food to be trapped during chewing. This fossa is important for the proper function and anatomy of the tooth.Rate this question:
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- 18.
Geometrical outline of buccal surface of posterior teeth?
- A.
Rhomboidal
- B.
Trapezoidal
- C.
Either
- D.
None
Correct Answer
B. TrapezoidalExplanation
The buccal surface of posterior teeth refers to the outer surface of the teeth that faces towards the cheeks or lips. The term "trapezoidal" refers to a shape that resembles a trapezoid, which is a quadrilateral with one pair of parallel sides. This suggests that the buccal surface of posterior teeth has a shape that is similar to a trapezoid. Therefore, the correct answer is "Trapezoidal."Rate this question:
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- 19.
Mesial slope of cusp is longer than distal in?
- A.
Mandibular canine
- B.
Maxillary canine
- C.
Maxillary first premolar
- D.
All
Correct Answer
C. Maxillary first premolarExplanation
The mesial slope of the cusp is longer than the distal slope in the maxillary first premolar. This is because the maxillary first premolar has a prominent mesial cusp called the buccal cusp, which is larger and longer than the distal cusp. This cusp is designed to aid in the grinding and chewing of food, making it necessary for the mesial slope to be longer for effective function.Rate this question:
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- 20.
Mesiolingual developmental grove is seen in?
- A.
Maxillary first molar
- B.
Maxillary 2nd molar
- C.
Mandibular first premolar
- D.
Maxillary first premolar
Correct Answer
C. Mandibular first premolarExplanation
The mesiolingual developmental groove is a characteristic feature of the mandibular first premolar. This groove is located on the mesial (towards the midline) surface of the tooth, and it serves as a developmental line that separates the mesial and lingual cusps of the premolar. It is an important anatomical feature used in identifying and classifying teeth. The other options, maxillary first molar, maxillary second molar, and maxillary first premolar, do not exhibit a mesiolingual developmental groove.Rate this question:
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