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Journal of Indian Society of Pedodontics and Preventive Dentistry Official publication of Indian Society of Pedodontics and Preventive Dentistry
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 ORIGINAL ARTICLE
Year : 2021  |  Volume : 39  |  Issue : 3  |  Page : 267-274

The effect of acid concentration and etch time on morphology and tensile bond strength of primary dentin: An in vitro study


1 Department of Pedodontics and Preventive Dentistry, Manipal Academy of Higher Education, Manipal College of Dental Sciences, Manipal, Karnataka, India
2 Department of Dental Materials, Manipal Academy of Higher Education, Manipal College of Dental Sciences, Manipal, Karnataka, India

Correspondence Address:
Dr. Rashmi Nayak
Department of Pedodontics and Preventive Dentistry, Manipal Academy of Higher Education, Manipal College of Dental Sciences, Manipal - 576 104, Karnataka
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jisppd.jisppd_141_21

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Background: There are conflicting results concerning the ideal time for etching primary dentin and its effect on the bond strength of adhesive restorative materials. Aim: To assess in vitro, the effect of varied acid concentration and etch time on the morphological features and tensile bond strength of primary dentin. Materials and Methods: Forty healthy primary molars were prepared by exposing the dentin of the occlusal surface, creating a smear layer. A 3 mm × 3 mm test indow was demarcated, and specimens were randomly allocated to four groups (n = 10): Group 1A 10% phosphoric acid, 7 s; Group 1B 10% phosphoric acid, 15 s; Group 2A 37% phosphoric acid, 7 s and Group 2B 37% phosphoric acid, 15 s. Surface analysis was done using atomic force microscope and scanning electron microscope. For tensile bond strength evaluation, 24 specimens prepared as mentioned were mounted in acrylic blocks and allocated to four groups according to the prescribed etching protocol. Resin rods were bonded and tested in tension after 24 h (n = 6). Data were analyzed statistically using unpaired t-test. Results: Etching of primary dentin using 37% phosphoric acid for 7 s produced the highest tensile bond strength of 9.51 ± 2.19 MPa. Conclusion: Etching time of 7 s may improve the adhesion of resin restorative materials with primary dentin.






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