Effect of cavity-cleaning agents on shear bond strength between self-etching adhesives and dentin

Aim: The effect of cavity-cleaning agents on shear bonding strength between self-etching adhesives and dentin was evaluated. Methods: Twenty-five healthy human third molars were worn to obtain flat middle dentin. The samples were randomly divided into five groups according to the cleaning agent used: group CB not treated with any cavity disinfectants and served as control. Following groups, dentin surfaces were treated with 2% chlorhexidine (CHX group); 3% hydrogen peroxide (HP group); calcium hydroxide water (CH group); and 70% ethyl ethanol (E group). The dentin surfaces were cleaned by friction for 20 s and dentine bonding agent, Clearfil SE Bond, was applied. Cylinders (5.0 mm  1.2 mm, n = 19) of fluid composite resin were placed on the dentin surface, and the teeth were stored in deionized water at 37°C for 24 h. Subsequently, the samples were subjected to the shear bonding test, and the obtained values were subjected to one-way ANOVA and Tukey's test (α = 0.05). The failure pattern was analyzed descriptively by examining the specimens with a stereoscope at a magnification of 4, and failure was classified into adhesive, cohesive or mixed type. Results: Shear bonding was significantly lower in group HP (6.17 ± 5.69 MPa). The groups CB, CHX, CH and E were statiscally similar, 22.15 ± 6.54MPa; 18.40 ± 7.26MPa; 18.07 ± 5.98MPa ; 16.43 ± 6.19MPa respectively. The failure modes observed were only adhesive and mixed. Conclusion: The use of 2% chlorhexidine, calcium hydroxide water, and 70% ethyl ethanol did not negatively affect bond strength. Only 3% hydrogen peroxide is contraindicated as a cavity cleaner in adhesive restorative procedures when self-etching system is used

Aplicabilidade clínica dos avanços da tecnologia CAD-CAM em odontologia / Clinical applicability of advances in CAD-CAM technology in dentistry

O avanço tecnológico tem se mostrado um grande aliado em diversas áreas, assim como na odontologia. O surgimento da tecnológica CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) na década de 1950 trouxe outra realidade para a prática clínica diária. Previamente todo o processo laboratorial de trabalhos protéticos era demorado e puramente físico, atualmente a fabricação das peças protéticas demanda um menor tempo devido a utilização do meio digital, o que consequentemente diminui as consultas aos Cirurgiões-Dentistas. A adição de ferramentas digitais no planejamento e na execução dos tratamentos odontológicos alterou completamente o workflow, fazendo com que a busca para um aperfeiçoamento seja constante visando sempre o melhor atendimento e qualidade dos tratamentos realizados. Dessa forma este trabalho tem o objetivo de realizar uma revisão crítica da literatura sobre a aplicabilidade clínica da tecnologia CAD-CAM em Odontologia.

The technological advance has been shown to be a greatly in several areas, as well as in dentistry. The emergence of the technological CAD / CAM (Computer Aided Design / Computer Aided Manufacturing) in the 1950s brought another reality to daily clinical practice. Previously, the entire laboratory process of prosthetic work was time consuming and purely physical, currently the manufacture of prosthetic work requires less time due to the use of the digital medium, which consequently decreases the dentist appointments. The addition of digital tools in the planning and execution of dental treatments has completely altered the workflow, making the search for a constant improvement, always aiming at the best care and quality of treatment performed. Thus, this paper has the objective of performing a critical review of the literature on the clinical applicability of CAD / CAM technology in dentistry.