Scanning electron microscopic study of prepared cavities involving enamel, dentin, and cementum.

The dental treatment needs of many elderly people involve root surface caries and class V restorations. A scanning electron microscopic examination of extracted teeth with class V cavity preparations showed that well-developed cementum margins could be produced. Most studies regard the dentinocemental junction as behaving as dentin in relation to the restorative sealing process and possible marginal leakage. This study emphasizes the importance of the inclusion of cementum in class V cavity preparation and the possibility of marginal leakage occurring, depending on the restorative material used and whether acid-etch techniques are involved. Further studies on the cementum margin should be undertaken in regard to special treatment requirements related to bonding, marginal preparation, and marginal leakage.