Interfacial adaptation of in vivo aged polyacid-modified resin composite (compomer) restorations in primary molars |
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Authors: | I. E. Andersson-Wenckert J. W. V. van Dijken P. Hörstedt |
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Affiliation: | Department of Oral Biology, Faculty of Odontology, Ume? University, 90187 Ume?, Sweden e-mail: Ingrid.Andersson-Wenckert@oralbio.umu.se; Tel.: +46 90-7856234; Fax: +46 90-770330, SE Unit of Electron Microscopy, Department of Pathology, Ume? University, Ume?, Sweden, SE
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Abstract: | Polyacid-modified resin composite (PMC) restorations are being increasingly used in class II cavities in primary teeth. The aim of this study was to evaluate the interfacial adaptation of 1-month- and 30-month-old in vivo restorations by quantitative scanning electron microscopy (SEM) evaluation. Twelve PMC restorations were performed under clinically controlled conditions in primary molars planned for extraction 1 month later for orthodontic reasons. Eleven other PMC restorations, aged 30 months (range 1.5–3 years) and part of a multicenter study, were collected after exfoliation. To observe the interfacial adaptation of each restoration at several levels a thin layer of the proximal surface was ground off 2–3 times. Replica impressions of each level were prepared for SEM. The interfaces of the replicas were evaluated at ×200 and ×1000. In the 1-month-old restorations gap-free adaptation to enamel was found in 87% and to dentin in 84% of the total interfacial length investigated. For the 30-month-old restorations gap-free adaptation was registered in 59 and 63%, respectively. The interfacial quality was significantly better in the 1-month-old restorations than in those 30 months of age. Adaptation to enamel was significantly better in the cervical part of the 1-month-old restorations than in the axial walls, whereas there was no significant difference in dentin. No significant difference was found between the cervical and axial cavity walls of the 30-month-old restorations. Enamel fractures were registered in 31 and 24%, respectively of the interfacial length of the 1-month- and 30-month-old restorations. The corresponding findings in dentin were 0 and 0.9%. It can be concluded that restorations aged for a short time showed a high percentage of sealing, which decreased significantly for the 30-month-old ones. Received: 24 June 1998 / Accepted: 7 October 1998 |
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Keywords: | Resin composite Deciduous dentition Adaptation Clinical evaluation Scanning electron microscopy |
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