Gap-Modified Bulk Placement Technique For Reducing Shrinkage Stresses In Direct Occlusal Bulk-Fill Resin Composite Restorations

Hassan KA and Khier SE

Published on: 2023-11-22

Abstract

Restoration of a deep occlusal cavity with a single mass of 4 mm bulk-fill resin composite placed using the conventional bulk filling technique generates, upon polymerization, shrinkage stresses and develops shrinkage displacements at interfaces.

This results in several detrimental consequences, among which are the deboning and internal micro-gap formation at the pulpal floor. This could lead to postoperative sensitivity, persistent tooth pain and failure of the restoration.

This paper aims to mainly provide a detailed account on the shrinkage movement or displacement generated by light curing and polymerization of bulk-fill resin composites placed directly in deep occlusal cavities. It is also the objective of this paper to highlight the internal deboning and micro-gap formation at pulpal floors as detrimental consequences of such polymerization shrinkage. In addition, it aims to review the gap-modified bulk filling technique utilized for reducing the shrinkage stresses generated in direct large occlusal bulk?fill resin composite restorations.