[S.E.M. analysis of composite resin surfaces applied to chemically and chemo-mechanically treated dentin]. / Analisi, al S.E.M., delle superfici di resina composita applicata su dentina sottoposta a trattamento chimico o chemio-meccanico.

The authors evaluated, at scanning electron microscope (S.E.M.), the morphological aspects of composite resin surfaces applied on dentin subjected, "in vitro", to chemical or chemo-mechanical treatments. S.E.M. photographs of dentinal surfaces of composite, applied on dentin treated with acid agents or Caridex, showed extensive penetration of resin tags into dentinal tubules and their deep adaptation to rough and winding dentinal surfaces. The obtained results have been evaluated in the light of recent advances in biocompatibility and long-term stability of composite fillings, in particular, to setting up new materials and methods in cavities preparation and treatment.

[Scanning electron microscopy evaluation of wear of turbine rotary instruments]. / Valutazione al microscopio a scansione dell'usura di strumenti rotanti montati su turbina.

A wear test was conducted to evaluate carbide and diamond dental burs, in air turbines at 400,000 r.p.m., by using a dentine-enamel substrate. There is less variability within each bur type. All of the burs showed a decreased ability to make a standard cut with succeeding trials. Generally, a linear dulling rate was observed with a progressive reduction of cutting effectiveness, except for middle grain burs, that showed better characteristics among tested burs.