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Acid etching in permanent teeth; laser etching in primary teeth was found more successful. The use of re-wetting agent did not provide an advance on bond strength of the adhesive in both primary and permanent teeth after acid-etch or laser-etch.

PURPOSEThe aim of this study was to evaluate effect of different surface treatment methods on the bond strength between aged composite-resin core and luting agent.MATERIALS AND METHODSSeventy-five resin composites and also seventy-five zirconia ceramic discs were prepared. 60 composite samples were exposed to thermal aging (10,000 cycles, 5 to 55℃) and different surface treatment. All specimens were separated into 5 groups (n=15): 1) Intact specimens 2) Thermal aging-air polishing 3) Thermal aging- Er:YAG laser irradiation 4) Thermal aging- acid etching 5) Thermal-aging. All specimens were bonded to the zirconia discs with resin cement and fixed to universal testing machine and bond strength testing loaded to failure with a crosshead speed of 0.5 mm/min. The fractured surface was classified as adhesive failure, cohesive failure and adhesive-cohesive failure. The bond strength data was statistically compared by the Kruskal-Wallis method complemented by the Bonferroni correction Mann-Whitney U test. The probability level for statistical significance was set at α=.05.RESULTSThermal aging and different surface treatment methods have significant effect on the bond strength between composite-resin cores and luting-agent (P<.05). The mean baseline bond strength values ranged between 7.07 ± 2.11 and 26.05 ± 6.53 N. The highest bond strength of 26.05 ± 6.53 N was obtained with Group 3. Group 5 showed the lowest value of bond strength.CONCLUSIONAppropriate surface treatment method should be applied to aged composite resin cores or aged-composites restorations should be replaced for the optimal bond strength and the clinical success.

Objectives: The aim of this study was to investigate the human dental pulp response after use of a hemostatic agent (Ankaferd Blood Stopper [ABS]) and a self-etching adhesive system (Clearfil Protect Bond [CPB]) in direct pulp capping.Materials and methods: For the first aim, 21 non-carious human third molar teeth scheduled for extraction were selected. Class I cavities with pulp exposures were prepared. In group 1, bleeding was controlled with sterile cotton pellets and restored with calcium hydroxide (CH) + ZnOE cement + amalgam. In group 2, bleeding was controlled with sterile cotton pellets and restored with CPB and a composite resin. In group 3, bleeding was controlled with ABS and restored with CPB and a composite resin. The teeth were extracted after 90 days, formalin-fixed, and prepared for histological investigation. The pulp response was categorized using the following criteria: inflammatory response, soft tissue organization, reparative dentine formation, and bacterial staining. Data were submitted to statistical analysis, using nonparametric Kruskal-Wallis test.Results: In pulp response study, it showed no statistically significant differences between groups for all parameters (p > 0.05).Conclusions: The application of CPB and ABS in direct contact with the mechanically exposed pulp of healthy human teeth can lead to acceptable repair of the dentine-pulp complex, such as wound healing with tertiary dentine bridge formation.