Comparing the Effect of Three Different Primers on Shear Bond Strength of Metal Brackets Bonded using Transbond XT Adhesive: An Invitro study

OBJECTIVE: The aim of the present study is to compare the effect of three different primers (Transbond XT, Transbond MIP, Orthofix Anabond) on shear bond strength of brackets bonded using Transbond XT adhesive. MATERIALS AND METHODS: 90 adolescent premolars extracted for orthodontic purposes were collected over a period of 3 month period. All the teeth were examined for caries, fractures, discolorations. The sample which met the inclusion criteria were debrided and stored in 10% formalin solution. Forty-eight hours before testing the samples for shear bond strength, the brackets were bonded to the teeth samples along with their primers and adhesive allocated to the three groups (Group A Transbond XT, Group B Transbond MIP and Group C Orthofix Anabond). After bonding, the samples were stored in distilled water until the tests were initiated. Thermocycling was carried out in a stability chamber TH 90 S/G, Labline pvt ltd with a dwell time of 60 seconds in each bath for 3000x cycles. After thermocycling, the samples were mounted on a Universal Testing Machine for shear bond strength analysis. A blade at a cross-head speed of 1mm/min was applied to the bracket base until the bracket de-bonds. The values are recorded in Mega Pascals. STATISTICAL INFERENCE: Based on the statistical data, there was no significant differences between the three groups studied(ANOVA. The independent t-test between two groups showed a statistical significance between group A and group B(p= 0.44), and t-test between group B & C and group A & C showed no statistical significance(p=0.88 &p=0.06). RESULT: Thus from the above data the two MIP’s (Transbond MIP and Orthofix Anabond) showed a similar mean shear bond strength of 10.88±2.98Mpa and 11.00± 3.01Mpa.The ARI scores of the three groups showed a score of 2 for the Transbong XT group and Anabond group suggesting a bond failure between the resin. The Transbond MIP group indicated a bond failure at the tooth-resin interface (score 1). CONCLUSION: Orthofix Anabond possessed a mean value similar to that of Transbond XT and can be used as an alternate to the latter. All the three primers provided an acceptable clinical bond strength