Adhesion of a self‐etching system to dental substrate prepared by Er:YAG laser or air abrasion

Abstract

The purpose of this study was to assess the microtensile bond strength of a self-etching adhesive system to enamel and dentin prepared by Er:YAG laser irradiation or air abrasion, as well as to evaluate the adhesive interfaces by scanning electron microscopy (SEM). For microtensile bond strength test, 80 third molars were randomly assigned to five groups: Group I, carbide bur, control (CB); II, air abrasion with standard tip (ST); III, air abrasion with supersonic tip (SP); IV, Er:YAG laser 250 mJ/4 Hz (L250); V, Er:YAG laser 300 mJ/4 Hz (L300). Each group was divided into two subgroups (n = 8) (enamel, E and dentin, D). E and D surfaces were treated with the self-etching system Adper Prompt L-Pop and composite buildups were done with Filtek Z-250. Sticks with a cross-sectional area of 0.8 mm(2) (+/-0.2 mm(2)) were obtained and the bond strength tests were performed. Data were submitted to ANOVA and Tukey's test. For morphological analysis, disks of 30 third molars were restored, sectioned and prepared for SEM. Dentin presented the highest values of adhesion, differing from enamel. Laser and air-abrasion preparations were similar to enamel. Dentin air-abrasion with standard tip group showed higher bond strength results than Er:YAG-laser groups, however, air-abrasion and Er:YAG laser groups were similar to control group. SEM micrographs revealed that, for both enamel and dentin, the air-abrasion and laser preparations presented irregular adhesive interfaces, different from the ones prepared by rotary instrument. It was concluded that cavity preparations accomplished by both Er:YAG laser energies and air abrasion tips did not positively influence the adhesion to enamel and dentin.

Bond Strengths of One-Step Self-Etch Adhesives to Laser-Irradiated and Bur-Cut Dentin After Water Storage and Thermocycling

“…12,18 Such approaches replace the invasive technique of using highspeed dental burs. 12,17,19 , Cavity preparation using lasers takes more time than cavity preparation with rotary cutting instruments, but advantages include low noise and vibration and eliminating the need for local anesthesia in most cases. An additional advantage of laser cavity preparation is that a smear layer of debris is not produced on the surface of the prepared cavity.…”

“…9,10 In hydrophilic monomers, carboxylic and phosphate groups act as proton donors in the partial demineralization of the smear layer and have the potential to bond ionically with the calcium from residual hydroxyapatite. 7 The current trend in minimally invasive dentistry involves alternative techniques for dental cavity preparation, such as laser irradiation [11][12][13][14][15][16][17] and aluminum oxide air abrasive. 12,18 Such approaches replace the invasive technique of using highspeed dental burs.…”

“…7 The current trend in minimally invasive dentistry involves alternative techniques for dental cavity preparation, such as laser irradiation [11][12][13][14][15][16][17] and aluminum oxide air abrasive. 12,18 Such approaches replace the invasive technique of using highspeed dental burs. 12,17,19 , Cavity preparation using lasers takes more time than cavity preparation with rotary cutting instruments, but advantages include low noise and vibration and eliminating the need for local anesthesia in most cases.…”

Influence of CVD Diamond Tips and Er:YAG Laser Irradiation on Bonding of Different Adhesive Systems to Dentin

“…12 The lower bond strength values obtained with the association of the total-etch adhesive tested with the laser preparation may also be due to the fact that irradiation of dentin with Er:YAG laser can denature the organic components of subsurface intertubular dentin, and affect the surface morphology and chemistry of dentin, mainly the organic components, 28,29 which may not be favorable for bonding. 21,30 In addition, the remaining denatured collagen fibrils are fused together, thus, the resin diffusion into the interfibrillar collagen spaces is probably prevented, compromising the bonding effectiveness. 24 The association of Adper Scotchbond SE with CVD tips produced lower means than when dentin was prepared with diamond burs or laser, in spite of the low thickness smear layer formed by this method of dentin preparation and the high aggressiveness of this adhesive system.…”

Effect of different root caries treatments on the sealing ability of conventional glass ionomer cement restorations

“…Some studies have shown that even after etching by an acid or self-etching agent, the bond strength of irradiated permanent and deciduous dentin is lower than that of regular acid-etched dentin [8][9][10]. However, different results have been found in other studies, making this a controversial issue [11][12][13][14][15].…”