Effects of occlusal cavity configuration on 3D shrinkage vectors in a flowable composite
| Autor: | Karl-Heinz Kunzelmann, Jian Jin, Guangyun Lai, Dalia Kaisarly, Peter Rösch, Moataz El Gezawi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Dental Stress Analysis
Molar Materials science Composite number 02 engineering and technology In Vitro Techniques Composite Resins 03 medical and health sciences Dental cavity preparation 0302 clinical medicine Materials Testing Flowable Composite Humans Composite material Dental Restoration Permanent General Dentistry Shrinkage Enamel paint X-Ray Microtomography 030206 dentistry Dental Marginal Adaptation 021001 nanoscience & nanotechnology Bevel visual_art visual_art.visual_art_medium Adhesive Dental Cavity Preparation 0210 nano-technology |
| Zdroj: | Clinical Oral Investigations. 22:2047-2056 |
| ISSN: | 1436-3771 1432-6981 |
| DOI: | 10.1007/s00784-017-2304-y |
| Popis: | The objective of this study was to investigate the effects of cavity configuration on the shrinkage vectors of a flowable resin-based composite (RBC) placed in occlusal cavities. Twenty-seven human molars were divided into three groups (n = 9) according to cavity configuration: “adhesive,” “diverging,” and “cylindrical.” The “adhesive” cavity represented beveled enamel margins and occlusally converging walls, the “diverging” cavity had occlusally diverging walls, and the “cylindrical” cavity had parallel walls (diameter = 6 mm); all cavities were 3 mm deep. Each prepared cavity was treated with a self-etch adhesive (Adper Easy Bond, 3 M ESPE) and filled with a flowable RBC (Tetric EvoFlow, Ivoclar Vivadent) to which had been added 2 wt% traceable glass beads. Two micro-CT scans were performed on each sample (uncured and cured). The scans were then subjected to medical image registration for shrinkage vector calculation. Shrinkage vectors were evaluated three-dimensionally (3D) and in the axial direction. The “adhesive” group had the greatest mean 3D shrinkage vector lengths and upward movement (31.1 ± 10.9 μm; − 13.7 ± 12.1 μm), followed by the “diverging” (27.4 ± 12.1 μm; − 5.7 ± 17.2 μm) and “cylindrical” groups (23.3 ± 11.1 μm; − 3.7 ± 13.6 μm); all groups differed significantly (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink