Objective: The purpose of this study was to investigate the shear bond strength (SBS) of two different adhesive resin cements used to lute ceramics on laser-etched dentin. Background data: Erbium, chromium: yttrium, scandium, gallium, garnet (Er,Cr:YSGG) laser irradiation has been claimed to improve the adhesive properties of dentin, but results to date have been controversial, and its compatibility with existing adhesive resin cements has not been conclusively determined. Materials and methods: Two adhesive cements, one ''etch-and-rinse'' [Variolink II (V)] and one ''self-etch'' [Clearfil Esthetic Cement (C)] luting cement, were used to lute ceramic blocks (Vita Celay Blanks, Vita) onto dentin surfaces. In total, 80 dentin specimens were distributed randomly into eight experimental groups according to the dentin surface-etching technique used Er,Cr:YSGG laser and Er:YAG laser: (1) 37% orthophosphoric acid + V (control group), (2) Er,Cr:YSGG laser + V, (3) Er,Cr:YSGG laser + acid + V, (4) Er:YAG laser + V, (5) Er:YAG laser + acid + V, (6) C, (7) Er,Cr:YSGG laser + C, and (8) Er:YAG laser + C. Following these applications, the ceramic discs were bonded to prepared surfaces and were shear loaded in a universal testing machine until fracture. SBS was recorded for each group in MPa. Shear test values were evaluated statistically using the Mann-Whitney U test. Results: No statistically significant differences were evident between the control group and the other groups ( p > 0.05). The Er,Cr:YSGG laser + A + V group demonstrated significantly higher SBS than did the Er,Cr:YSGG laser + V group ( p = 0.034). The Er,-Cr:YSGG laser + C and Er:YAG laser + C groups demonstrated significantly lower SBS than did the C group ( p < 0.05). Conclusions: Dentin surfaces prepared with lasers may provide comparable ceramic bond strengths, depending upon the adhesive cement used.

Summary. The EEC syndrome is a condition characterized by ectrodactyly, ectodermal dysplasia and clefting of the lip and/or palate. Here we report a case of a boy with the EEC syndrome. The clinical and radiologic aspects of this condition, as well as the dental treatment, are reviewed. Résumé. La dysplasie ectodermique, l'ectrodactyle et la fente palatine et labiale sont caractéristiques d'un syndrôme. L'aspect clinique, radiologique et le traitement dentaire d'un patient atteint de ce syndrôme, sont étudiés dans cet article. Zusammenfassung. Das EEC Syndrom ist charakterisiert durch Ektrodaktylie, ektodermale Dysplasie und durch Lippenoder und Gaumenspalten. In diesem Bericht wird ein Fall mit EEC Syndrom beschrieben, die klinischen und röntgoloischen Aspekte dieses Syndromes, ebenso die zahnärztliche Behandlung dieses Falles. Resumen. El sindrome EEC (EDF) es una condición caracterizada por ectrodactilidad, displasia ectodérmica y fisura (hendidura) del labio y/o paladar. Se reporta un caso con el síndrome EEC y los aspectos clínicos y radiográficos de la condición así como el tratmiento odontológico realizado.