Tuesday, October 11, 2011

Laser-textured surfaces on the adhesion of composite to dentin

Dental Materials
Volume 27, Issue 10 , Pages 1038-1044, October 2011

Abstract 

Objective

To assess the influence of laser-textured surfaces on the adhesion of composite to dentin after being rotary prepared.

Methods

Thirty healthy teeth were kept in 0.1% thymol solution prior to being ground down to dentin to create a 4×4mm2 flat surface. Teeth were divided into 3 groups (n=10). Groups 1 and 2 utilized the prototype Erbium doped, Yttrium–Aluminum–Garnet Er:YAG laser by Dental Photonics, Inc. A single pulse was delivered to each spot to create an equally spaced square 4×4mm2 matrix of micro craters. All craters had 100μm diameter/45μm depth; two different spacing patterns were prepared in Groups 1 and 2. In Group 1, distance between crater centers was 50μm; Group 2 had 100μm. In Group 3 (control), 10 samples were prepared without laser texturing. G-bond (GC America) was applied to testing area of all samples in all groups according to manufacturer's instructions. Bonding resin was applied and shear-bond strength tests were employed using an Instron machine to measure adhesive strength.

Results

One-way analysis of variance (ANOVA) was used to compare the 3 groups. Pair wise t-tests implementing the Bonferroni correction for multiple comparisons found a statistically significant difference between Group 3 and Group 2 (p=0.019) but no statistically significant difference between Group 3 and Group 1 (p=0.263) or Group 1 and Group 2 (p=0.743).

Significance

The bond strengths between bonded composite to laser-textured dentinal surfaces with larger spacing patterns are greater than that of non-textured surfaces.

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