Abstract
ObjectiveTo assess microleakage in conservative class V cavities prepared with aluminum-oxide air abrasion or turbine and restored with self-etching or etch-and-rinse adhesive systems.Material and MethodsForty premolars were randomly assigned to 4 groups (I and II: air abrasion; III and IV: turbine) and class V cavities were prepared on the buccal surfaces. Conditioning approaches were: groups I/III - 37% phosphoric acid; groups II/IV -self-priming etchant (Tyrian-SPe). Cavities were restored with One Step Plus/Filtek Z250. After finishing, specimens were thermocycled, immersed in 50% silver nitrate, and serially sectioned. Microleakage at the occlusal and cervical interfaces was measured in mm and calculated by a software. Data were subjected to ANOVA and Tukey’s test (α=0.05).ResultsForty premolars were randomly assigned to 4 groups (I and II: air abrasion; III and IV: turbine) and class V cavities were prepared on the buccal surfaces. Conditioning approaches were: groups I/III - 37% phosphoric acid; groups II/IV -self-priming etchant (Tyrian-SPe). Cavities were restored with One Step Plus/Filtek Z250. After finishing, specimens were thermocycled, immersed in 50% silver nitrate, and serially sectioned. Microleakage at the occlusal and cervical interfaces was measured in mm and calculated by a software. Data were subjected to ANOVA and Tukey’s test (α=0.05).ConclusionMarginal seal of cavities prepared with aluminum-oxide air abrasion was different from that of conventionally prepared cavities, and the etch-and-rinse system promoted higher marginal seal at both enamel and dentin margins.
Highlights
The concept of cavity preparation has been modified and/or replaced by more conservative preparations due to the use of new techniques and restorative materials that preserve sound tooth structure by minimizing the necessity to enlarge the cavity preparation11
Air-abrasive technique using a high-speed stream of purified aluminum oxide particles delivered by air pressure for removal of tooth structure was reintroduced with the intention to eliminate pressure, heat, noise and vibration associated with rotary instruments, and to reduce pain, allowing preparation with less need for local anesthesia20
The roughened surface resulting from air abrasion preparation limits the penetration of the adhesive agent when this modified surface is not etched with acid9
Summary
The concept of cavity preparation has been modified and/or replaced by more conservative preparations due to the use of new techniques and restorative materials that preserve sound tooth structure by minimizing the necessity to enlarge the cavity preparation. Air-abrasive technique using a high-speed stream of purified aluminum oxide particles delivered by air pressure for removal of tooth structure was reintroduced with the intention to eliminate pressure, heat, noise and vibration associated with rotary instruments, and to reduce pain, allowing preparation with less need for local anesthesia. Following an etch-and-rinse approach, the tooth is first etched and rinsed off. This conditioning step treats enamel and dentin with inorganic acid (mostly 30-40% phosphoric acid), promoting the increase of the permeability and the demineralization of enamel as well as dentin (inter-, peritubular, intratubular)
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