NBDE Dental Anatomy Perm-T
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104 terms
Terms | Definitions |
|---|---|
 Which tooth has the greatest axial inclination relative to the occlusal plane? | Max. Central Incisor |
| What is the longest and widest anterior tooth and the most prominent tooth in the mouth? | Max. Central Incisor |
| In Max. Central which outline is more convex? Mesial/Distal | Distal |
| In Max. Central what is the widest part of the crown outline? | wider mesiodistally than faciolingually |
| What are the characteristics of the Max. central root? | One root - one canal Conical - blunt apex Only max. tooth equal in thickness in all dimensions Not usual to have pulp horns |
| In Max. Central which incisal corner is more rounded? | Distoincisal |
| Where are the mesial and distal contact areas centered? | Faciolingually centered |
| Where is the cingulum of the Max. Central located? | Off-center toward the distal |
| What two teeth does the Max. central occlude with? | Mand. Central and Lateral incisors |
| What tooth has the narrowest incisal embrasure? | Max. Central |
| Which teeth have the most variable crown shape of all permanent teeth? | Max. Third molars |
| What is the shortest permanent tooth? | Max. 3rd molar |
| What teeth are congenitally missing or non functional | Max. 3rd molar |
| What tooth has a crown that tapers more from buccal to lingual | Max. 3rd molar |
| What tooth frequently only has three cusps and is sometimes difficult to identify each? DL cusp is frequently absent Oblique ridge is poorly developed | Max. 3rd molar |
| What tooth has roots that are unpredictable and usually short and fused? | Max. 3rd molar |
| What is sometimes fused to the distal of the Max. third molar? | A small molar called a paramolar |
| What teeth does the Max. 3rd molar occlude with? | Mand. third molar only |
| How is the Mand. lateral incisor tilted? | Tilted distally on the root |
| What are the characteristics of the Lateral Mand. incisor's root? | One root - small % with two canals Very narrow mesiaodistally Concavities on mesial and distal surfaces |
| In an anterior cross bite relationship (class III), as the mand. retrudes what teeth do the max. laterals contact? | Mand. canine and lateral. |
| Which tooth is the most often restored extracted and replaced? | Mand. first molar |
| What tooth has the largest mesiodistal dimension of any tooth? | Mand. first molar |
| What is the occlusal outline of the Mand. first molar? | Pentagonal "home plate" outline |
| Which dimension is larger on a Mand. first molar? | Mesiodistal slightly greater than the faciolingual |
| What are the characteristics of the Mand. first molar roots? | 2 roots - 3 canals (second in mesial root) Roots widely separated Short root trunk |
| What is the largest mandibular cusp? Smallest? | Mesiobuccal Distal |
| Which cusps on a mand. first molar are higher and pointy? | Lingual cusps |
| What is the occlusal pattern of Mand. first molars? | 2 Transverse ridges 3 fossae with pits crooked central groove |
| What is another name for mand. first molars? | Six-year molars first permanent tooth to erupt |
| What tooth has a mesiolingual developmental groove? | Mand. first premolar |
| What is the shape of the mand. first premolar | Bell-shaped, cervical very constricted |
| What has a more prominent buccal ridge? Mand. first/second premolar | Mand. first premolar |
| What are the characteristics of the Mand. first premolar? | one short and pointed broader facially than lingually no distal curvature slight concavities on mes. and dis. |
| What are the characteristics of the buccal cusp of mand. first premolar | large occupies 2/3rds of occlusal surface Prominent triangular ridge |
| What has a small lingual cusp which is about 2/3rd the height of the buccal cusp and is non-functioning? | Mand. first premolar |
| What crown usually has no central groove and its mesial marginal ridge is more cervical than the distal marginal ridge? | Mand. first molar |
| What does the Mand. first premolar mimic in masticatory function? | Mand. canine |
| What is the most reliable distinguishing feature of the mand. third molar? | Marked distal inclination of the root trunk 2 roots |
| What tooth has bulbous crowns that taper from the mesial to the distal? | Mand. third molars |
| What dimension is larger in a Mand. third molar? | Mesial distal dimension over the faciolingual dimension |
| Is the root trunk of the mand. third molar long or short? | Long |
| What kind of anomalies are more common in the mand. third molar? | Oversized Undersized in Max. third molars |
| Which cusps are wider and longer on the mand. third molar? | MB cusps over the DB cusps |
| What is the occlusal appearance of the Mand. third molars? | Irregular groove pattern with many supplemental grooves |
| What is the most distinguishable difference between the max. first and second premolars | The number of roots |
| Which tooth is more symetrical and less angular? Max. first/second premolar | Max. second premolar |
| What are the dimensions of the max. second premolar? | Wider faciolingually than mesiodistally |
| How many roots does the max. second premolar have? | 1 |
| What tooth has two cusps that are almost equal in height? | Maxillary second premolar |
| What two teeth have a mesial inclination? | Max. first and second premolars |
| Which cusp ridge is longer in a Max. second premolar? | DBCR instead of the MBCR (opposite of max. first premolar) |
| What is the occlusal pattern of the second max. premolar? | shorter central groove than first premolar with more supplemental grooves |
| What tooth has a rhomboidal shape that is sometimes accompanied by a fifth cusp? | Max. first molars |
| The Max. first molar is broadest in which dimension? | Broader lingually than buccally |
| What two angles of a Max. first molar are Obtuse? | ML and DB Acute = MB and DL |
| What are the characteristics of the Max. first molar's roots? | 3 MB often has two canals (MB an ML) MB and ML hive higher pulp horns than distal and palatal |
| What cusp is always the largest and highest on any posterior tooth? | ML |
| What tooth has a pronounced cervical concavity that needs special attention when root planning, and is the second tooth to erupt after the mand. first molar? | Max. first molar |
| Which tooth generally has the longest roots in the dental arch | Max. canines |
| What tooth represents a transition form the anterior to the posterior, where its mesial resembles the incisors and its distal posterior teeth | Max. Canine |
| What tooth is wider labiolingually and from a proximal view appears to be positioned vertically in the arch? | Max. Canine |
| What does the heavy root of the max. canine result in? | Canine eminence |
| Where does the cusp tip of the Max. molar appear to be from the incisal view? | mesial-facial of the crown |
| What groove does the max. canine have that no other tooth has? | Lingual-gingival groove |
| What is the least often extracted tooth? | Max. Canine and Mand. canine |
| What tooth has a lingual groove which extends from the enamel to the cementum area of the root? | Max. Lateral Incisor |
| True/False: The root lengths of Max. Central and Lateral incisors are equal. | True |
| What are the characteristics of the root of the Lateral maxi. incisor? | one Apex is pointed and deviates to distal |
| What is the most concave surface of all the incisors and has a linguoincisal ridge that is well developed? | Max. lateral Incisor |
| What might the lateral max. incisor have that would be prone to decay? | Radicular groove |
| What teeth does the max. lateral incisor occlude with? | Incisal edge of the Mand. lateral and canine |
| What is the tooth that is most often in an abnormal relation and contact with adjacent teeth in the same arch? | Max. lateral Incisors |
| What is the Anterior tooth which is most often absent congenitally? | Max. lateral Incisor |
| What tooth besides the third molars experiences the most variation in form? | Max. lateral Incisors "Peg shaped" or "Dens in Dente" |
| What is the last anterior tooth to begin calcification at 10 months? | max. lateral incisors |
| What is the mesial concavity on the Max. first premolar called? | Mesial developmental depression |
| What premolar is longer occluso-cervically than any its adjacent premolar first molar and second molar? | Max. First premolar |
| What is the only premolar that has two roots? | Max. first Premolar |
| Where is the lingual cusp directed on the Max. first premolar? | towards the distal of the tooth |
| What is the anterior tooth that is most likely to have a bifurcated root? | Mandibular Canine |
| What tooth has the greatest faciolingual measurement being greater than the greatest mesiodistal measurement? | Mandibular Canine |
| What are the characteristics of the root of the Mand. canine? | 1 Poss. bifurcated (Labial/lingual) Poss. developmental depression on mesial surface |
| Which way is the Mand. canine cusp tip displaced? | Lingually |
| On Mand. canine which cusp ridge is shorter? Distal/Mesial | Distal cusp ridge |
| What is significant about the mesial surface of the mand. canine? | Almost parallel to the long axis of the tooth |
| The fact that the mand. canine is smooth, slender and has less well developed labial and lingual ridges allows for what? | Mand. canine is very caries resistant |
| What do all canine have that is found on the labial surface in the incisal third just mesial to the labial ridge? | Mesiolabial developmental depression |
| What tooth can exhibit three types of occlusal patterns? What are they? | Mand. Second Premolars Y, H, U Types |
| What is the most usual type of Mand. second premolar and how may lobes does it develop from? | Y-type 5 lobes |
| What is the occlusal shape of the Mand. second premolar? | Square shorter and wider than first premolar |
| What are the characteristics of the Mand. second premolar root? | 1 apex approximates the mental foramen thicker and longer than mand. 1st premolar |
| What tooth is wider on the lingual than on the buccal, most frequently has a lingual pit and has no mesiolingual groove or tansverse ridge? | Mand. second premolar |
| Which molar is least likely to need a buccal pit restoration? | Max. second molar |
| What are two major differences between the Max. 1st and 2nd molars? | 2nd molar: Nonexistent DL cusp More angular than the first molar |
| What is different about the roots of second max. molars compared to max. first molars? | They bend more distal and have a longer root trunk |
| What is the hardest tooth to determine right from left? | Mand. second molar |
| What is the occlusal outline of the mand. second molar? | rectangular |
| Where is the greatest faciolingual diameter located on the Mand. second molar? | mesial third of the crown |
| What are the characteristics of the Mand. second molar root? | 2 Closer together straighter than 1st not as broad Faciolingually as 1st Longer root trunk than 1st |
| What is the occlusal pattern of a Mand. second molar? | Plus sign Straight central groove more secondary developmental grooves 2 transverse ridges |
| What is the most distinguishing feature of the Mand. second molar? | has only one buccal groove and one buccal pit |
| What is the smallest tooth in the dental arch? | Mand. Central incisor |
| What is the shape of the mesial and distal surfaces of the root of a Mand. central incisor? | Concave |
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