INBDE (Integrated National Board Dental Examination) Practice Exam

Class 1 composite retention is achieved by which 2 things?

1. Occlusal convergence and bonding

2. Micromechanical retention and base layer

3. Chemical retention and shape

4. Bonding and chemical retention

The correct answer is: Occlusal convergence and bonding

Composite restoration is a process where a tooth is restored using dental composite material that is tooth colored. Composite retention refers to the bond strength between the tooth structure and the composite material used in the restoration process. This is important as it ensures the longevity and stability of the restoration. Option A, occlusal convergence and bonding, is the correct answer because occlusal convergence creates a wider surface for bonding, increasing the retention of the composite material. This is achieved by shaping the cavity in a converging manner and then bonding the material to the tooth structure using an adhesive. Option B is incorrect because although micromechanical retention and a base layer may help to improve the bond strength, they are not the primary techniques used for composite retention. Option C is incorrect because while chemical retention may play a role in the bonding process, it is not as significant as occlusal convergence and bonding. Option D is incorrect because bonding alone may not provide sufficient retention and chemical retention needs to be combined with another technique such as occlusal convergence to achieve optimal results.