[S.E.M. examination of different grades of curette wear]. / Esame al S.E.M. del diverso grado di usura delle curettes.

After succeeding working trials, a wear test was conducted to evaluate different curettes, by using S.E.M. analysis and replica technique. The obtained results underline the importance of structural characteristics of curettes to maintain standard rates of cutting effectiveness.

[Effect on periodontal tissue of a "cushioned" bristle brush. (S.E.M. analysis)]. / Effetti sui tessuti parodontali di uno spazzolino a setole "ammortizzate" (Analisi al S.E.M.)

The Authors have made in vivo verification by means of replica technique observed with SEM any possible traumatic effects and gingival modification which a bristle toothbrush (Sanogyl, Berna) has on the soft tissues. The toothbrush has particular features which make it possible to perform an almost perfect dental hygiene of the papillar area, it does not produce any secondary negative effects on the gingival soft tissues.