The purpose of this 12-month randomized clinical investigation was to compare the clinical performance of posterior composite resin restorations implanted in vital teeth using various placement techniques.

Because of their conservative nature, aesthetic qualities, and consistently improved mechanical performance and handling features, resin-based composites have become the restorative material of choice for posterior teeth. Nevertheless, significant obstacles influencing the stability of the marginal area, sensitivity following the procedure, and the durability and effectiveness of composite restorations in the long run are polymerization shrinkage and stress associated with shrinkage.

To reduce polymerization stress and maximize adaptability to hollow walls, various placement procedures have been suggested. While older incremental layering methods sought to lessen the configuration factor (C-factor) and increase light penetration, more recent methods like the Stamp and Snowplow approaches sought to replicate the occlusal architecture and enhance marginal sealing. Conversely, bulk-fill techniques were first developed to streamline clinical processes by enabling the use of bigger composite layers with the promise of lower shrinkage stress.

Despite a plethora of in vitro studies, there is a dearth of high-quality clinical data that compares these placement methods under controlled settings. Due to the fact that laboratory studies cannot completely replicate the oral environment, clinical trials continue to be the best way to assess the real-world efficacy of restorative procedures.

Consequently, this randomized clinical trial set out to assess the clinical efficacy of posterior composite restorations placed in vital teeth utilizing four distinct procedures over the course of a year

Inclusion Criteria:

• Good general and oral health
• Vital posterior teeth with primary occlusal caries
• Class I cavities with depth ranging from 3 to 4 mm

Exclusion Criteria:

• Non-vital or restored teeth
• Parafunctional habits (e.g., bruxism)