|An acoustic emission study on interfacial debonding in composite restorations|
|Liu, Xiaozhou3,4; Li, Haiyan5; Li, Jianying5; Lu, Peijun1,2; Fok, Alex Siu-Lun5|
|关键词||Interfacial Debonding Composite Restoration Acoustic Emission Finite Element Method Shrinkage Stress|
|WOS标题词||Science & Technology|
|类目[WOS]||Dentistry, Oral Surgery & Medicine ; Materials Science, Biomaterials|
|研究领域[WOS]||Dentistry, Oral Surgery & Medicine ; Materials Science|
|关键词[WOS]||SHRINKAGE-STRESS ; POLYMERIZATION SHRINKAGE ; RESIN RESTORATIONS ; BOND STRENGTH ; C-FACTOR ; CLINICAL-EVALUATION ; CONFIGURATION ; DENTIN ; MICROLEAKAGE ; CONTRACTION|
Objective. This paper studied in vitro the effect of the C-factor on interfacial debonding during curing of composite restorations using the acoustic emission (AE) technique. Finite element (FE) analyzes were also carried out to evaluate the interfacial stresses caused by shrinkage of the composite resin in restorations with different C-factors.
Materials and methods. Twenty extracted third molars were divided into 4 groups of 5. They were cut to form Class-I (Groups 1 and 2) and Class-II (Groups 3 and 4) cavities with different C-factors. The average C-factors of the four groupswere 3.37, 2.88, 2.00, and 1.79, respectively. The cavities were then applied with an adhesive and restored with a composite, which was cured by a halogen light for 40 s. A 2-channel AE system was used to monitor the interfacial debonding, caused by shrinkage stress, between the tooth and restoration through an AE sensor attached to the surface of the specimen. Recording of the AE started at the same time as curing of the composite and lasted 10 min. Simplified FE modelswere used to evaluate the interfacial stresses in restorations with different C-factors, with a thermal load (temperature decrease) being applied to the composite resin to simulate its shrinkage.
Results. The mean and standard deviation of the total number of AE events for the four groups were 29.6 +/- 15.7, 10.0 +/- 5.8, 2.6 +/- 1.5, and 2.2 +/- 1.3, i.e. the number of AE events increased with an increase in the C-factor. The FE results also showed that, the higher the C-factor of the restoration, the higher the interfacial tensile stress between the tooth and restoration.
Significance. From the results of the AE tests and FE simulations, it can be concluded that, the higher the C-factor, the higher the shrinkage stress and the more likely is interfacial debonding. (C) 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
|资助机构||China Scholarship Council ; MDRCBB|
|作者单位||1.Peking Univ, Sch Stomatol, Minist Hlth, Res Ctr Engn & Technol Computerized Dent, Beijing 100871, Peoples R China|
2.Peking Univ, Hosp Stomatol, Minist Hlth, Res Ctr Engn & Technol Computerized Dent, Beijing 100871, Peoples R China
3.Peking Univ, Sch Stomatol, Dept Prosthodont, Beijing 100871, Peoples R China
4.Peking Univ, Hosp Stomatol, Dept Prosthodont, Beijing 100871, Peoples R China
5.Univ Minnesota, Sch Dent, Minnesota Dent Res Ctr Biomat & Biomech, Minneapolis, MN 55455 USA
|Liu, Xiaozhou,Li, Haiyan,Li, Jianying,et al. An acoustic emission study on interfacial debonding in composite restorations[J]. DENTAL MATERIALS,2011,27(9):934-941.|
|APA||Liu, Xiaozhou,Li, Haiyan,Li, Jianying,Lu, Peijun,&Fok, Alex Siu-Lun.(2011).An acoustic emission study on interfacial debonding in composite restorations.DENTAL MATERIALS,27(9),934-941.|
|MLA||Liu, Xiaozhou,et al."An acoustic emission study on interfacial debonding in composite restorations".DENTAL MATERIALS 27.9(2011):934-941.|