title: Evaluation of marginal failures of dental composite restorations by acoustic emission analysis.
abstract: In this study, a nondestructive method based on acoustic emission (AE) analysis was developed to evaluate the marginal failure states of dental composite restorations. Three types of ring-shaped substrates, which were modeled after a Class I cavity, were prepared from polymethyl methacrylate, stainless steel, and human molar teeth. A bonding agent and a composite resin were applied to the ring-shaped substrates and cured by light exposure. At each time-interval measurement, the tooth substrate presented a higher number of AE hits than polymethyl methacrylate and steel substrates. Marginal disintegration estimations derived from cumulative AE hits and cumulative AE energy parameters showed that a signification portion of marginal gap formation was already realized within 1 min at the initial light-curing stage. Estimation based on cumulative AE energy gave a higher level of marginal failure than that based on AE hits. It was concluded that the AE analysis method developed in this study was a viable approach in predicting the clinical survival of dental composite restorations efficiently within a short test period.
authors.affiliation: Department of Mechanical Engineering, Graduate School, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea.
authors.forename: Ja-Uk
authors.initials: JU
authors.lastname: Gu
authors.forename: Nak-Sam
authors.initials: NS
authors.lastname: Choi
mesh_terms: D003188:Composite Resins / Q000737:chemistry; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates; D008963:Molar; D058105:Polymerization; D019904:Polymethyl Methacrylate; D019279:Resin Cements / Q000737:chemistry; D013016:Sound; D013193:Stainless Steel
chemical_list: C112828:Clearfil AP-X; D003188:Composite Resins; D008689:Methacrylates; D019279:Resin Cements; D013193:Stainless Steel; D019904:Polymethyl Methacrylate