The Influence of Er: YAG Laser, Alumi-num oxide and diamond bur on surface treatment of Aged Composite Resin to Repair Restoration

Abstract

Aims: Aim of this study is to investigate the effect of Er: YAG Laser, the sand blasted with aluminum oxide and wearing with diamond bur as a surface treatment to the bond strength of repaired composite resin after aged. Materials and Methods: Sixty Teflon mold (4mm×2mm), of Tetric® Ceram prepared. The specimens were randomly separated into six groups and undergo the following surface treatments: G1 no treatment (control), G2-G4 treated with a different amount of laser energy (40, 60, 80 mJ Er: YAG laser respectively) under a 2Hz frequency, G5 wearing with diamond bur, and G6 sandblasted with 50µm aluminum oxide. All 6 groups divided into two subgroups,1st control,2ed etched with 37 % phosphoric acid. Bonding material was applied and the second split of Teflon mold (4mm×1mm) placed onto the prepared specimen, filled with Tetric N-Ceram. The shear test was done using the Universal testing machine. Results: Significant differences of all variables, laser 60,40mj surface treatment displayed superior shear strength (45.24, 45.03 MPa respectively), aluminum oxide showed low shear value (32.48 MPa). Phosphoric acid showed the highest shear value (40.47 MPa) in compare to the control one (31.62 MPa). Conclusions: Using of Er:YAG laser improve the shear value of repaired composite in comparing with a diamond bur and aluminum oxide. Conditioning aged composite surface with a phosphoric acid enhancing its adhesive result. Keywords: Er: YAG Laser, Aluminum oxide air abrasion, and Composite repair. Hasan NH. The Influence of Er: YAG Laser, Aluminum oxide and diamond bur on surface treatment of Aged Composite Resin to Repair Restoration.. Al-Rafidain Dent J. 2012; 12(2): 257-265. Er: YAG Laser, Aluminum oxide, diamond bur and Composite Resin Repair Al -Rafidain Dent J Vol. 12, No2, 2012 Hasan NH Different letters indicate significant differences. Mj: mill jowl energy; AL 2 O 3 : Aluminum oxide air abrasive; PH: Phosphoric acid.

Effect of different surface treatments on the shear bond strength of nanofilled composite repairs

“…Following air abrasion, some of the resin matrix is removed and the surface fillers are exposed resulting in an increased surface roughness of the composite resin. 8 , 23 Several previous studies have reported contradictory findings about air abrasion. In some studies, sandblasting promoted the best repair bond strength, 1 , 25 , 26 while a reduction in repair strength after surface abrasion was found in a few studies.…”

“…In some studies, sandblasting promoted the best repair bond strength, 1 , 25 , 26 while a reduction in repair strength after surface abrasion was found in a few studies. 8 , 27 , 28 This reduction has been ascribed to the exposure of filler particles, and hence decreased amount of available resin for bonding. 8 , 23 It seems that the application of a silane coupling agent following sandblasting in the present study enhanced the bond to the exposed filler particles and thus, increased the repair bond strength.…”

“… 4 , 6 - 9 , 15 , 16 In recent years there has been more focus on the efficiency of lasers for composite repair bond strength, including Er:YAG laser. 4 , 8 , 9 , 17 …”

“…Studies have shown that Er:YAG laser can influence the surface of composite resins in addition to tooth surfaces. 4 , 8 , 9 , 17 The wavelength of Er:YAG laser is 2940 nm and it is absorbed by the water and hydroxyapatite of the tooth. In the laser ablation process the produced heat releases hydroxyl groups from hydroxyapatite, 18 causing the water surrounding the apatite crystals to evaporate suddenly.…”

Effects of surface treatments on the bond strength of glass hybrid restorative system repaired with hybrid composite resin

“…In this study, Al 2 O 3 increased the bonding strength significantly in the repair process of the RBCs. Most of the previous studies have also found that Al2O3 increases the bond strength significantly (16,(24)(25)(26)(27)(28)(29)(30)(31)(32), but a few studies found that opposite results (33,34). Al2O3 has the ability to form micro retention areas and these areas increase wettability and adhesion to the restoration (35).…”