The correct access cavity preparation for the mandibular second molar is:
- a. Oval.
- b. Quadrilateral.
- c. Round.
- d. Triangular.
The correct access cavity preparation for the mandibular second molar is d. Triangular, not any of the other options.
While the upper second molar indeed has a triangular access cavity, the lower second molar shares its shape with the lower first molar, which is trapezoid. This shape allows for optimal access to the pulp chamber and root canals while maintaining enough tooth structure for support.
Here's a quick summary of access cavity shapes for both upper and lower teeth:
Upper Jaw:
- Central incisor: Triangular
- Lateral incisor: Ovoid
- Canine: Ovoid
- Premolars: Ovoid
- First molar: Triangular
- Second molar: Triangular
Lower Jaw:
- Central incisor: Ovoid
- Lateral incisor: Ovoid
- Canine: Ovoid
- Premolars: Ovoid
- First molar: Trapezoid
- Second molar: Trapezoid
I apologize if my previous response about the lower second molar's access cavity being triangular was incorrect. I hope this clarifies the information!
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Endodontics