Composite Resins

This randomized controlled clinical study aims to evaluate the clinical performance of five different bulk-fill composite materials representing distinct technological approaches according to the World Dental Federation (FDI) criteria. The materials include a thermoviscous bulk-fill composite applied with preheating, a sonic-activated bulk-fill composite, a flowable bulk-fill composite, an ORMOCER-based bulk-fill composite, and a conventional bulk-fill composite. Restorations will be clinically assessed at baseline, 1 month, 6 months, and 12 months for esthetic, functional, and biological outcomes.

Higher mechanical properties are needed to restore structurally compromised posterior teeth, short fiber reinforced resin composite and injectable bioactive resin composites provide superior properties to flowable composites that were traditionally used to improve adaptation in deep cavities below the packable resin composite restorations. Thus, this study was designed to assess the clinical outcome of high strength dentine substitute materials.

One challenge faced by dental professionals is that, unlike natural tooth structure, composite restorations do not lighten when exposed to bleaching agents. As a result, functional restorations may need replacement after bleaching to match the newly whitened teeth. However, replacing a composite restoration can lead to unnecessary removal of tooth structure, potentially weakening the tooth and increasing its susceptibility to further iatrogenic damage. This study will investigate the ability of Omnichroma restorations to shade-match tooth structure after bleaching. The null hypotheses will be: 1. Single-shade RBC will not exhibit similar shade and optical behavior to conventional RBC across all anterior restorations following bleaching. 2. Patient satisfaction regarding color blending between the restoration and tooth structure will not differ according to the type of material used. 3. Dentist satisfaction regarding color blending between the restoration and tooth structure will not differ according to the type of material used.

The ability of single-shade composite restorations to blend with adjacent tooth structure shades is called chameleon effect. This effect is enhanced using specially designed spherical particles in the composite material which will help diffuse light in a way that mimics the natural color and translucency of teeth making the restoration nearly imperceptible to the naked eye. The hypotheses of the investigation are as follow: * Single-shade RBC exhibits similar shade matching and optical behavior to conventional RBC across all anterior restorations. * Patient satisfaction regarding color blending between the restoration and tooth structure is comparable regardless of the type of material used. * Dentist satisfaction regarding color blending is similar for both single-shade RBC and conventional RBC materials.