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Dental Anatomy
Root Morphology
| Question | Answer |
|---|---|
| T-F all proximal surfaces converge toward the apex from crest of curvature (height of contour) | TRUE |
| In an ideal dentition, the proximal crest of curvature would also be the ____ ____ | contact area |
| Proximal crests are located in the ___ or ___ third of the crown. | Proximal crests are located in the INCISAL or MIDDLE THIRD of the crown. |
| The general rule is that the ___ crest is more incisal-occlusal than the ___ crest, and ___ cusp ridges are shorter than ___ cusp ridges; ___ outlines are straighter than ___ outlines. | The general rule is that the MESIAL crest is more incisal-occlusal than the DISTAL crest, and MESIAL cusp ridges are shorter than DISTAL cusp ridges; MESIAL outlines are straighter than DISTAL outlines. |
| T-F: all facial surfaces of the crown are concave and the crest of curvature is located at the cervical third of the crown. | FALSE, all facial surfaces of the crown are CONVEX ---->( |
| T-F: the lingual surfaces of posterior teeth are concave and the crest of curvature is located in the middle third. | FALSE, the lingual surfaces of posterior teeth are CONVEX ---->( |
| T-F: the lingual surfaces of anterior teeth are concave in the middle third. | TRUE, ( <---- |
| The CEJ on the proximal surface curves toward the ___-___ surface on the anterior teeth than on the posterior teeth. | The CEJ on the proximal surface curves toward the INCISAL-OCCLUSAL surface on the anterior teeth than on the posterior teeth. |
| the mandibular posterior teeth's long axis of the crown tilts _____ to the long axis of the root. | LINGUALLY |
| (1st statement, 2nd statement T-F) proximal surfaces converge toward the lingual; the two exceptions are the maxillary second premolar and the maxillary first molar. | first statement true, second FALSE.the two exceptions are the MANDIBULAR second premolar and the maxillary first molar. |
| the three roots of teeth are called: ____, ____, and ____. | mesiobuccal, distobuccal, lingual (or palatal) |
| root concavities: | longitudinal depressions (AKA fluting) |
| T-F: individual roots are basically cone shaped. | TRUE, cone shaped: being widest at the CEJ and converging to the apex. |
| a cervical cross-section of teeth with one root shows these three basic shapes: | conical/triangular, ovoid, and elliptical |
| triangular teeth: | maxillary incisors |
| ovoid teeth: | canines and some mandibular premolars. |
| elliptical teeth: | maxillary premolars, mandibular incisors, and some mandibular premolars. |
| second and third molar roots are more likely to be ___ and distally inclined. | fused |
| T-F: all maxillary roots are more lingually inclined than their crowns. | TRUE |
| this tooth may have a palatoradicular groove on the lingual aspect, extending from the crown to the root. | maxillary lateral incisor |
| why is it easier to access the proximal surfaces of anterior incisors and cuspids from the linguals? | because their roots have smaller/narrower lingula surfaces then facial surfaces. |
| this tooth is the longest and strongest of ALL teeth in the dentition. | Canines |
| typically, ____ root trunks are longer than ___ root trunks. | typically, MAXILLARY root trunks are longer than MANDIBULAR root trunks. |
| this maxillary tooth will most likely have 2 roots. | FIRST PREMOLAR |
| this tooth has a prominent mesial root concavity that begins on the crown apical to the medial contact and extends apically to the furcation, making it periodontally fragile. | Max. 1st Premolar |
| this tooth's root trunk is the longest. | Max. 1st Premolar |
| of the max. first molar, the ____ root is the longest | Palatal (lingual) |
| the ___ root and the ___ root's apices curve toward each other like a pliers' handle. | the MESIOFACIAL root and the DISTOFACIAL root's apices curve toward each other like a pliers' handle. |
| T-F: the root trunk of the max. first molar is at least 1/2 of the root length | FALSE, 1/3 |
| the ___ molar trunk is usually longer than the ___ molar trunk | second, first |
| the second molar's furcations are hard to find because: | the roots are closer together. |
| this tooth has proximal grooves on both sides which can give the appearance of a double root. | mandibular incisors |
| these roots are small and narrow mesially-distally | mandibular incisors. |
| this tooth has the longest root in the mandibular arch | canine |
| these teeth may have a deep proximal root concavity on the distal root surface | mand. 1st premolars |
| crowns of these teeth are inclined toward the lingual and may be more difficult to instrument. | all of the mandibular posterior teeth |
| the distal root of this tooth is more narrow than the mesial. | mand. first molar |
| the concavity on this tooth befor the furcation on the facial begins just after the CEJ (fluting) | mand. first molar |
| this tooth's root trunk is shorter and has a larger interradicular area | mand. first molar |
| this tooth has proximal and furcal concavities on the mseial root. | mand first molar |
| this tooth's mesial root is wider and stronger than the distal root | mand. first molar |
| this tooth can have supernumerary roots, dilacerations, hypercementosis, enamel pearls, and/or fused roots | mand. third molar |
| this tooth has a deep lingula groove that starts on the distolingual marginal ridge and extends onto the root. | max. laterals |
| T-F: roots with furcation involvement are especially difficult to manage. | TRUE |
| T-F: Cervical enamel projections occur two times as often on maxillary molars thanmandibular molars and more often on the buccal surface. | FALSE, CEP may occur on mand. molars. |
Created by:
Jenny teeth