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Shear Bond Strength of Composite Resin Bonded to Enamel Etched with Er; Cr : YSGG Laser: A Comparative in vitro Study

Author: Qasim Abdulkareem Mohammad
Journal: Medical Journal of Babylon مجلة بابل الطبية ISSN: 1812156X 23126760 Year: 2016 Volume: 13 Issue: 3 Pages: 610 -622
Publisher: Babylon University جامعة بابل

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Abstract

Eighty sound bovine incisors have been selected for this study, and divided into eight groups (N=10). The labial enamel of group 1 was conventionally etched by 37% phosphoric acid, group 2 roughened with diamond bur then acid etched, group 3, 5, and 7 etched by Er;Cr:YSG Glaser with a power of 1W, 2W and 3W respectively, groups 4, 6 and 8 same as groups 3, 5 and 7 but followed by acid etching. After that self-etching bonding agent applied and cured then a composite core made and loaded till failure. One-way AVOVA test showed significant differences between groups (p<0.05). Duncan multiple range post-hoc test showed that the SBS mean value for group 3 was (5.8±1.2 MPa), and the group 4 (9.7±1.6) which was significantly higher than group 3, but both of them were significantly lower than other groups. There were no significant differences among group 5 (15.6±1.2), group 7 (16±1.1) and group 1 (17.1±2.6). No significant differences were found among group 2 (21.2±1.9), group 6 (21.3±2.2) and group 8 (22.6±1.5), and these three groups were significantly more retentive than all other groups in this study. Conclusions: 1W laser etching produced the least SBS. 2W and 3W laser etching can substitute acid etching, but they give better results as good as bur roughened+acid etching if they followed by acid etching.


Article
Evaluation of Shear Bond Strength of Composite Resin to Dentin after Etching with Er,Cr:YSGG Laser And Conventional Acid Etch (An In Vitro Study

Author: Saif Nadhim Hassoon سيف نديم حسون
Journal: Tikrit Journal for Dental Sciences مجلة تكريت لعلوم طب الاسنان ISSN: 20731213 Year: 2015 Volume: 3 Issue: 1 Pages: 45-54
Publisher: Tikrit University جامعة تكريت

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Abstract

The aim of this study was to evaluate shear bond strength of composite to dentin after etching with conventional acid, Er,Cr:YSGG laser and Er,Cr:YSGG laser in conjunction with acid. Thirty recently extracted lower third molars were collected. Scaling and polishing of teeth were done. Roots of teeth were embedded inside self cured acrylic resin blocks to form acrylic base with occlusal surfaces parallel to base of blocks. Crowns of teeth were sectioned at one third of the crowns to obtain a flat dentin surfaces. Total number of samples were divided into 3 groups each of one contained (10) samples as following : Group 1- dentin surfaces were treated with 35% phosphoric acid only. Group 2- dentin surfaces were treated with Er,Cr:YSGG laser only. Group 3- dentin surfaces were initially treated with Er,Cr:YSGG laser, then with 35% phosphoric acid. Bonding agent was applied to dentin surfaces and composite was applied by using rubber mold then light cured. Composite posts were released from molds then shear bond strength was measured. Statistical analysis showed that there was significant difference among all groups and acid etching group showed significant highest Shear bond strength followed by group of laser & acid etching then group of laser etching showed the significant least shear bond strength. From this study it can be concluded that etching of dentin with Er,Cr:YSGG laser can produce shear bond strength weaker than that of conventional acid etching.

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