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.
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