8/18/2023 0 Comments Dental circular contour definitionSupplemental grooves branch from the developmental grooves, but these grooves are not always present in the same pattern on the occlusal table of each different tooth type. In contrast, supplemental grooves, or secondary grooves, appear as shallower, more irregular linear depressions ( Figure 17-5). Finally, there are triangular grooves that separate a marginal ridge from the triangular ridge of a cusp, and at their terminations form the triangular fossae. Other developmental grooves are marginal grooves, which cross the marginal ridges and serve as a spillway, allowing food to escape during mastication. The most prominent developmental groove on posteriors is the central groove, which generally travels mesiodistally and separates the occlusal table buccolingually. The grooves are sharp, deep, V-shaped linear depressions. The developmental grooves on each different posterior tooth type are located in the same place and mark the junction between the developmental lobes. Sometimes located in the deepest parts of the fossae are occlusal developmental pits each pit is a sharp pinpoint depression where two or more grooves meet.ĭevelopmental grooves, or primary grooves, are also found on the occlusal table. Another type of fossa is the triangular fossa, which appears to have a triangular shape at the convergence of the cusp ridges, and is associated with the termination of the triangular grooves (discussed next). One type of fossa on posteriors, the central fossa, is located at the convergence of the cusp ridges in a central point, where the grooves meet. Some inclined planes are functional and thus involved in the occlusion of the teeth (see Chapter 20).įIGURE 17-4 Example of the other features of the occlusal table on a permanent posterior tooth, including the central groove.Įach shallow and wide depression on the occlusal table is a fossa, (plural, fossae). These planes are named by combining the names of the two cusp ridges that are between them. Between these cusp ridges are sloping areas, or four inclined cuspal planes. Some anatomists liken a cusp to a gothic pyramid, with four cusp ridges descending from each cusp tip. The occlusal surface also has two or more cusps. The crown of each has an occlusal surface as its masticatory surface, bordered by the raised marginal ridges that are located on both the distal surface and mesial surface ( Figure 17-2). The permanent posterior teeth include the premolars and molars ( Figure 17-1, see Figure 2-4 15-2). Trifurcated (try-fer- kay-ted ) Permanent Posterior Teeth Ridge: oblique (obleek), transverse (trans- vers), triangular Occlusal (ah- kloo-zl ) developmental pits, table Molars (mo-lers ): mulberry, (mull-bare-ee ), peg Groove: central, marginal, triangular ( kusp-al) New Key TermsĬusp of Carabelli (kusp kare-ah- bell-ee ), grooveįluting (fos-ah ) (plural, fossae, fos-ay ): central, triangularįossa (fos-ah ) (plural, fossae, fos-ay ): central, triangular Integrate the knowledge of dental anatomy of the permanent posterior teeth into the dental treatment of patients in order to preserve them.Discuss the important clinical considerations and developmental disturbances based on the anatomy of the permanent posterior teeth.Describe the general and specific features of posterior teeth and each posterior tooth type of the permanent dentition.Define and pronounce the key terms when discussing the permanent posterior teeth.Demonstrate the correct location of each permanent posterior tooth on a diagram and a patient.Use the correct names and universal designation numbers of each permanent posterior tooth when examining a diagram and a patient.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |