Assessment of Postoperative Sensitivity in Direct Resin Composite Restorations with and Without Liners

Background: Sensitivity after treatment is one of the most frequent complications with direct resin composite restoration work that can seriously affect patient comfort. Reduction of this sensitivity has been put forth by liners use, and their evidence is inadequate yet. The study aimed to develop and evaluate postoperative sensitivity of restorations done using liners and un-linered. Methods: This comparative, randomized controlled study was generated between January and April 2025 at the Department of Operative Dentistry, [Name of Institution]. One hundred patients who were in Class I and II posterior corrected restorations were accepted, through consecutively non-probability sampling. The subjects were randomly assigned into either Group A which had resin composite restoration but included a cavity liner (calcium hydroxide or resin modified glass ionomer) or Group B which had no liner at all. To determine sensitivity, a visual analog scale (VAS) was assessed at baseline, 24 hours, 3 days and 7 days after surgery. The analysis of data was performed with SPSS 26.0, and independent t-tests and chi-square tests were employed. The p-value < 0.05 was taken to be statistically significant. Results: The sensitivity of group A was considerably low at 24 hours, 3 days, and 7 days (p = 0.01, 0.003 and 0.0005 correspondingly) in comparison with group B. Less differences of baseline demographic or clinical parameters were observed. Conclusion: Under the resin composite restoration, liners have been chosen successfully to alleviate the initially perceived postoperative sensitivity. The evidence can be used to include liners in the standard restorative practice.