Formation of Diagonal Gaps as Stress-Relieving Sites: Rethinking the Concept of Increment Splitting in Direct Occlusal Composite Restorations

The split-increment horizontal placement technique is currently used, along with other restorative techniques, in moderate-to-large occlusal cavities for reducing the shrinkage stress generated during light polymerization. Such stress, if released uncontrolled, may cause damage within composite, tooth or at adhesive interface. term “diagonal cut” was used our original paper published 2005 to refer action of dividing each composite increment into segments prior polymerization and presented two-dimensional illustration. Besides, we made no mention gap” as an outcome such diagonal cutting. We recognize importance introducing need shedding some on its role help provide a more comprehensive view technique. purpose current rethink splitting concept direct restorations by stress-relieving vertical site demonstrating it three-dimensional illustration providing understanding Conclusion: In paper, introduced gap created cutting increment, before curing. This enables segmented undergo unrestrained shrinkage, where segment being free from adhesion can deform independently segments. relief curing prevents formation cracks enamel and/or debonding interfaces. Keywords: deformation; gap; incremental; occlusal; shrinkage; posterior composite; segment; split-increment; reduction;