Dental Charting, Tooth Morphology, and Occlusion Flashcards

Which tooth has a distinctly heart-shaped cross-section at the cervical third?

Answer: Maxillary central incisor

The maxillary central incisor has a heart-shaped (triangular) cross-section at the cervical third due to its labial convexity and lingual concavity.

In the Universal Numbering System, which tooth is #17?

Answer: Mandibular left third molar

In the Universal system, #17 is the mandibular left third molar; numbering continues from #16 (maxillary left third molar) around the arch.

A charting symbol of a red circle drawn around an existing restoration indicates:

Answer: A restoration present that is defective or needs replacement

A red circle or outline around a charting symbol denotes an existing condition that is defective and requires treatment.

Which cusp of the maxillary first molar is the smallest and located on the mesiolingual line angle?

Answer: Cusp of Carabelli

The cusp of Carabelli is an anomalous fifth cusp found on the mesiolingual surface of the maxillary first molar and is the smallest cusp.

In Angle's Class II Division 2 malocclusion, how are the maxillary central incisors positioned?

Answer: Lingually inclined (retroclined)

Class II Division 2 is characterized by a distal molar relationship with maxillary central incisors that are retroclined (tipped lingually).

The buccal groove of the mandibular first molar separates which two cusps?

Answer: Mesiobuccal and distobuccal cusps

The buccal groove of the mandibular first molar runs cervically between the mesiobuccal and distobuccal cusps on the buccal surface.

When charting, the abbreviation 'PFM' refers to which type of restoration?

Answer: Porcelain fused to metal crown

PFM stands for porcelain fused to metal, a common crown type combining a metal substructure with a porcelain veneer.