Postoperative Sensitivity of Selective-Etch and Total-Etch Techniques in Composite Resin Restorations: An In Vivo StudyCorrespondence Address :
Trien Dentistry- The Dental Clinic, Second Floor, Anagha Apartment, Shihab Thangal Road, Panampilly Nagar, Kochi-682036, Kerala, India.
Introduction: Composite restorations placed using selectiveetch technique has been claimed to induce significantly lower postoperative sensitivity than a three-step etch and rinse technique. Selective-etch technique overcomes the main drawback of self-etch technique, which is suboptimal etching of mineralised enamel, by acid etching only the enamel prior to using the adhesive. The newer universal bonding agent can be used in a self-etch, selective-etch, or etch and rinse mode.
Aim: To evaluate the influence of selective-etch versus totaletch techniques of using Scotchbond universal adhesive on the postoperative sensitivity in composite restorations placed by undergraduate students.
Materials and Methods: Sixty patients with ICDAS code 4 or 5 cavities for composite restorations by undergraduate students were randomly allocated into two groups. Restorations were done using Filtek Z350 XT and Scotchbondâ„˘ Universal Adhesive. In total-etch group, the entire preparation was acid etched for 20 seconds, and rinsed with water spray for 15 seconds. In selective-etch group, only the enamel was acid etched for 20 seconds, and rinsed. The postoperative sensitivity of the restorations was evaluated preoperatively, immediately after treatment, 24 hours and 2 weeks after treatment. Sensitivity scores were generated from the patientâ€™s response to a Visual Analogue Scale (VAS) having scores from 0 to 10. The results were statistically analysed using Mann Whitney U-test and Friedman test. The level of significance was set at p-value less than 0.05.
Results: There was no significant difference in the sensitivity between total-etch and selective-etch groups pre-treatment and during three postoperative follow-up periods (p-value >0.05). However, there was statistically significant decrease in the sensitivity at 24 hours and 2 weeks after treatment when compared with baseline scores in both total-etch and selectiveetch groups (p-value <0.001).
Conclusion: Both total-etch and selective-etch techniques of bonding using universal adhesive systems can be safely practiced by dental undergraduate students without the fear of developing postoperative sensitivity in patients.
Acid etching, Composite bonding, Dentin sensitivity, Universal adhesive system, Visual analogue scale
Date of Submission: Oct 12, 2019
Date of Peer Review: Nov 18, 2019
Date of Acceptance: Mar 11, 2020
Date of Publishing: Apr 01, 2020
• Financial or Other Competing Interests: None
• Was Ethics Committee Approval obtained for this study? Yes
• Was informed consent obtained from the subjects involved in the study? Yes
• For any images presented appropriate consent has been obtained from the subjects. NA
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