Restorative & Materials · single question
For a large distal caries on tooth #2 (maxillary right second molar), what is the BEST initial approach for cavity preparation?
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Correct answer: B. Occlusal approach
Regardless of which proximal surface is involved, posterior cavity preparations (Class II) are always initiated from the OCCLUSAL surface. The occlusal entry establishes the outline form, axial wall depth, and provides access to the proximal box. Starting from the distal directly risks damaging the adjacent tooth, provides poor access, and violates preparation principles. The proximal extension is then made from the occlusal entry.
- A. CORRECT. All Class II preparations begin with an occlusal entry point, then extend to the proximal box (distal in this case).
- B. Incorrect. Beginning preparation directly from the distal surface risks damage to adjacent tissues and violates standard preparation sequence.
- C. Incorrect. A mesial approach is not appropriate for a distal caries lesion and would require unnecessary tooth structure removal.
- D. Incorrect. A buccal approach is used for Class V cervical lesions — not for Class II proximal caries on posterior teeth.
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