Abstract
Data (MPa) were analyzed by two-way ANOVA (Surface treatment X Etching time) and Tukey's test (5%). Results and conclusions: Surface treatment with CVD tips (27.70 ± 4.04a) produced significantly higher bond strength values compared to diamond tips (23.96 ± 5.83b), and 5 second etching time on dentin produced similar bond strength values when compared to 10 and 15 second etching times. Objectives: Evaluate the microtensile bond strength of a total-etch adhesive to dentin, using a CVD tip and a diamond tip to use in dentin preparation and varying the etching time. Material and method: The dentin from the buccal face of sixty bovine teeth was exposed and prepared using two different methods (n=30): Group 1 (DT) – a diamond tip on a high-speed handpiece; and Group 2 (CVD) – a CVD tip on an ultrasonic handpiece. Each group used 37% phosphoric acid and was divided into three subgroups, according to the etching time (n=10): Subgroup 5 - 5 seconds; Subgroup 10 - 10 seconds; and Subgroup 15 - 15 seconds. The teeth were restored with Single Bond adhesive and the composite resin Herculite Classic. The specimens were subjected to thermomechanical wear (mechanical cycling/100.000 cycles, thermal cycling/1.000 cycles). Stick-like specimens were obtained and submitted to a microtensile test in a universal testing machine.
Highlights
A lmost five decades after the beginning of adhesion use on dental substrates, and with the advancement of technology and scientific knowledge applied to dentistry procedures, the bond to dentin has still been widely questioned, at the gingival margins of adhesive restorations, where the substrate is at the dentin/ cement junction is the dentin/cement junction [1]
The Group CVD, which promoted surface treatment with CVD tips (27.70±4.04a), presented higher bond strength values compared with Group DB, which promoted surface treatment with diamond burs (23.96±5.83b)
The first null hypothesis tested was rejected because surface treatment with CVD tips showed higher bond strength values when compared to surface treatment with diamond burs
Summary
A lmost five decades after the beginning of adhesion use on dental substrates, and with the advancement of technology and scientific knowledge applied to dentistry procedures, the bond to dentin has still been widely questioned, at the gingival margins of adhesive restorations, where the substrate is at the dentin/ cement junction is the dentin/cement junction [1]. A smear layer is deposited on the tooth substrates, and it can be modified according to the rotatory instrument used in cavity preparation [3,4,5,6]. The cavity preparation using diamond burs has advantages such as providing precise cuts, ease of operation, and tactile and visual operator control [4,6]. This technology can cause discomfort for the patient because it generates heat, pressure, vibration, and noise, making it difficult to gain the patient’s cooperation, especially in pediatric dentistry [6,7,8]
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