Effect of Different Temporarization Material and Surface Treatments Methods on Shear Bond Strength of Orthodontic Brackets: An In-Vitro Study
Khalid Alhendi, Ahmed Mohammed Alassiry
Abstract
AIM- The study aims to evaluate the shear bond strength and adhesive remnant index scores of three different types of provisional crown material which have been treated with four different surface treatment methods.
MATERIAL AND METHODS- 80 blocks each of auto-curing PMMA, CAD/CAM PMMA and bis-acryl resin were fabricated (n=240) and were divided into four sub-groups (n=20/sub-group). The blocks were treated with four different types of surface treatment methods (surface roughening, sandblasting, MMA chemical application and CO2 laser). Orthodontic brackets were bonded, SBS testing was performed and ARI scores were evaluated. The data was analyzed by two-way ANOVA, post-hoc Tukey’s test and chi-square analysis.
RESULTS- Mean SBS was highest in bis-acryl group (16.08 ± 3.54 MPa) and lowest in auto-polymerizing PMMA group (9.41 ± 3.05 MPa). Two-way ANOVA demonstrated statistically significant differences (p<0.05) in mean SBS values of different surface treatment methods. Post-hoc Tukey’s test demonstrated that sandblasted and CO2 laser sub-groups showed significant differences (p<0.05) in CAD/CAM PMMA group and only sandblasted sub-group showed in bis-acryl group (p<0.05). Chi-square test demonstrated no significant difference in ARI scores of different materials and surface treatment methods. ARI scores 2 and 3 were predominantly more in bis-acryl groups whereas other groups consisted more of ARI score 0 and 1.
CONCLUSION- The bis-acryl group presented with highest mean SBS values. Sandblasting and application of CO2 laser on the surface of CAD/CAM PMMA blocks lead to higher SBS than other methods. In bis-acryl group, higher SBS was found in the sandblasting group as compared to others. Most of the provisional crown material presented with ARI scores of 0 and 1 indicating adhesive type failure.
CLINICAL SIGNIFICANCE- Provisional crown materials with superior surface treatment methods can enhance the bond strength of the adhesive on the orthodontic brackets.
Full Text: PDF DOI: 10.15640/ijhs.v11n1a3
Today
All Days
Online