California Registered Dental Assistant (RDA) Written Practice Exam

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What matrices are commonly used on primary teeth?

  1. Matrix band and wooden wedge

  2. T-band and spot welded

  3. Sectional matrix and ring

  4. Circumferential matrix

The correct answer is: T-band and spot welded

The matrix band and wooden wedge (choice A) are commonly used on permanent molars for Class II restorations, not primary teeth. Choice C, the sectional matrix and ring, are used for posterior Class II restorations in permanent teeth. Choice D, circumferential matrix, is used for anterior Class II restorations in permanent teeth. Therefore, choice B, T-band and spot welded, is the correct answer for matrices commonly used on primary teeth.

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