Related Experiment Video
Updated: Jun 13, 2026
07:42
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Micro-CT evaluation of internal adaptation in composite restorations using incremental and sonic-activated techniques
Parthivi Singh1, Vartul Dwivedi1, Siddhi Yadav2
1Department of Conservative Dentistry and Endodontics, Peoples Pental Academy, Peoples University, Bhopal, Madhya Pradesh, India.
Bioinformation
|June 12, 2026
Summary
Sonic-activated bulk-fill composite restorations show superior internal adaptation compared to conventional incremental techniques. This method significantly reduces internal gaps and voids, potentially improving the longevity of posterior dental restorations.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Internal adaptation of composite restorations is crucial for clinical longevity, especially in posterior teeth.
- Voids and gaps in restorations can lead to secondary caries and failure.
- Conventional incremental layering techniques present challenges in achieving optimal adaptation.
Purpose of the Study:
- To compare the internal adaptation of composite restorations placed using different techniques.
- To evaluate conventional incremental, oblique incremental, and sonic-activated bulk-fill methods.
- To determine the impact of placement technique on internal gap and void formation.
Main Methods:
- Sixty standardized Class II cavities were prepared and restored.
- Three placement techniques were used: conventional incremental, oblique incremental, and sonic-activated bulk-fill (n=20 per group).
- High-resolution micro-computed tomography was employed to quantify internal gap volume, void volume, and total defect percentage.
Main Results:
- The sonic-activated bulk-fill technique exhibited significantly lower internal gap volumes (p<0.001).
- Void volumes were also significantly reduced with the sonic-activated bulk-fill technique compared to incremental methods (p<0.001).
- Total defect percentage was lowest in the sonic-activated bulk-fill group.
Conclusions:
- Sonic-activation technology provides superior internal adaptation in composite restorations.
- This improved adaptation suggests enhanced clinical performance and longevity for posterior restorations.
- The sonic-activated bulk-fill technique may offer advantages over traditional incremental layering methods.
