Oral Anatomy .....1

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.

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.

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."

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.

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.

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.

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.

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.

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.

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).

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.

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.

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.

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.

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.

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.

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.

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.

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.