Evaluation of shear bond strength of different orthodontic primers on natural teeth – An in-vitro study

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Original Article

Author Details : M. Karthi*, A. Raja, S. Raja, K. Prabhakar

Volume : 5, Issue : 4, Year : 2021

Article Page : 26-32

https://doi.org/10.18231/j.jco.2021.005

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Abstract

Aim and Objective: The aim of this study was to evaluate the Shear Bond Strength of three different Hydrophilic primers available in the market compared with a conventional hydrophobic Primer and also to evaluate the amount of residual adhesive resin on the enamel surface after debonding using ARI Index.

Matrials and Methods: Hundred natural premolar teeth extracted for orthodontic treatment were included in this study. This study compared the Shear Bond Strength of three different hydrophilic primers namely Transbond MIP (3M Unitek), OrthoSolo (Ormco) and Stedman (Anabond) under salivary contaminated conditions with the standard hydrophobic Primer (Transbond XT – 3M Unitek) under dry conditions. The natural premolar teeth were equally divided into four groups namely Group A, Group B, Group C and Group D with 25 teeth in each group mounted in acrylic blocks. The teeth in these groups were bonded with three different hydrophilic primers [Transbond MIP (3M Unitek), OrthoSolo (Ormco) and Stedman (Anabond)] respectively after salivary contamination. All the premolars  were bonded with 0.022 MBT metal Brackets. A light cure unit (Ivoclar Vivadent) was used to cure the adhesive. For Salivary contamination on the teeth after acid etching, the operator’s saliva was collected by Spitting Method in a test tube and used. The bonded teeth were subjected to evaluation of shear bond strength using a Universal Testing Machine. After debonding, ARI scores on the Enamel Surface were evaluated using the Stereomicroscope under 10X magnification. The results of the shear bond strength were measured in Megapascals and tabulated for Statistical analysis. Shapiro Wilks Test was performed to evaluate the normality of the distribution, Kruskal Wallis Test was done to identify the association between various groups. Chi Square test was done to find the association between groups for ARI scores.

Results & Conclusion: The results showed that based on p value, all the primers are highly statistically significant in achieving the acceptable shear bond strength. Under contaminated condition, Transbond MIP (3M Unitek) showed highest mean shear bond strength of about 12.24 MPa followed by OrthoSolo primer (Ormco) and the lowest shear bond strength by Anabond Stedman primer. Transbond XT showed mean shear bond strength of 9.22 MPa under dry condition. Based on Post hoc dunn’s Test, there was no significant difference between individual groups except between Group B (Transbond MIP) and Group D (Anabond Stedman) & Group B (Transbond MIP) and Group C (OrthoSolo) which showed statistically significant difference of p<0> bond failure at the adhesive bracket interface resulting in reduced enamel fracture with highest percentage exhibited by Transbond XT(84%) followed by OrthoSolo(68%), Transbond MIP(64%) and Anabond Stedman primer(60%). Transbond XT primer showed 0% of frequency of enamel fracture indicating that no bond failure occurred at the adhesive bracket interface resulting in reduced enamel fracture.

Keywords: Shear Bond Strength, Transbond XT, Transbond MIP, OrthoSolo, Stedman, Universal Testing Machine(UTM), Shear Bond Strength(SBS), Adhesive Remnant Index(ARI), Stereomicroscope.

How to cite : Karthi M, Raja A, Raja S, Prabhakar K, Evaluation of shear bond strength of different orthodontic primers on natural teeth – An in-vitro study. J Contemp Orthod 2021;5(4):26-32

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