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Microshear bond strength of 2 and 3 step etch-and-rinse adhesive systems: effects of different treatments of etched dentin

Grant number: 11/20271-3
Support Opportunities:Regular Research Grants
Duration: March 01, 2012 - May 31, 2012
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal Investigator:Edson Alves de Campos
Grantee:Edson Alves de Campos
Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


The aim of this study is to evaluate the use of chlorhexidine in different excipients on the microshear bond strength of 2 and 3 step etch-and-rinse adhesive systems. For this study will be selected sound human molars. The occlusal surfaces of the teeth will be removed with a low-speed diamond saw to expose flat dentin surfaces. Different 2-step (Adper Single Bond 2 and Excite) and 3-step (ScotchBond Multi Purpose and Syntac) etch-and-rinse adhesive systems will be applied on the previously etched dentin (phosphoric acid 35%), after one of the following dentin treatments: dentin saturated with water; dentin impregnated with chlorhexidine in water; dentin saturated with ethanol; dentin impregnated with chlorhexidine in ethanol. Afterwards, transparent cylindrical arrays will be placed on the dentin surface treated with the adhesives and will be filled with a composite resin and photoactivated for 20 s. The arrays will be immediately removed to expose the composite resin cylinders with cross-sectional area of 0.38mm2. After a storage period of 7 days in artificial saliva at 37ºC, the specimens will be fitted with a device for testing bond strength to microshear held in a universal testing machine with a loading speed of 0.5mm/min. The results will be submitted to appropriate statistical tests, depending on data distribution. (AU)

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