Compare the Effects of Different Etching Times on the Etching Pattern, Etching Depth, and Bond Strength in Permanent Teeth Using 37 % Phosphoric Acid and Enlight Light Cure Bonding Material

Abstract Background: Present study was done to compare the effects of different etching times on the etching pattern, etching depth, and bond strength in permanent teeth using 37 % phosphoric acid and Enlight light cure bonding material. Methodology: The study was done on total sample of 115 extracted premolar teeth. Samples were divided into five groups according to different etching time of 15, 30, 60, 90, 120 seconds. These were further subdivided into three subgroups for etch pattern, etch depth, and bond strength measurement. Result: Showed that highest mean etch depth was recorded in Group E (120 seconds etching) of 15.88±2.58 µm and least etch depth in Group A (15 seconds etching) of 8.87± 2.25 µm. Highest mean shear bond strength was recorded for Group C (60 seconds etching) of 17.06±3.80 Mpa and least was observed in Group E (120 seconds etching) of 9.78± 3.7Mpa. Conclusion: Above findings strongly suggest that 15 seconds etching and 30 seconds etching time should be the most preferred procedures to obtain clinically acceptable mean shear bond strength with minimum loss of enamel mineral. We strongly recommend these approaches.