A Scanning Electron Microscopic Study Comparing the Marginal Adaptation of Different Bulk Fill Composites in a Class...

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Biomaterials

Background:

• Bulkfill composites offer efficiency in posterior restorations.
• Ensuring excellent marginal adaptation is crucial for longevity and preventing secondary caries.
• Low shrinkage composites aim to minimize polymerization stress and improve clinical outcomes.

Purpose of the Study:

• To compare the marginal adaptation of four different bulkfill low shrinkage composite materials in class II cavities.
• To evaluate the performance of these composites under scanning electron microscopy (SEM).

Main Methods:

• Extracted human molars were prepared with class II cavities.
• Four bulkfill composite materials (Tetric N Ceram, SDR, Sonicfill, Filtek bulkfill) were used for restoration.
• Marginal adaptation was assessed using SEM after sectioning, with some samples undergoing thermocycling.

Main Results:

• SDR and Sonicfill exhibited better marginal adaptation compared to Tetric N Ceram and Filtek bulkfill.
• All tested bulkfill composite groups demonstrated superior adaptation at the enamel margin versus the cementum margin.
• Thermocycling did not significantly alter the observed marginal adaptation patterns.

Conclusions:

• SDR and Sonicfill represent promising options for bulkfill low shrinkage composite restorations in class II cavities.
• Material selection plays a significant role in achieving optimal marginal integrity.
• Further clinical studies are warranted to confirm long-term performance.