| 0521 In Vivo Wear of Acrylic Denture Teeth | ||
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T. STOBER, H. GILDE, J. KUGLER, K. ROHSTOCK, and P. RAMMELSBERG, Ruprecht-Karls-Universitaet Heidelberg, Germany Objectives: Wear resistance is an important requirement for posterior denture teeth to maintain occlusal stability, and to prevent temporomandibular disorders. It is difficult to predict clinical wear behavior of denture teeth on the basis of current in vitro data. Therefore, the purpose of this prospective study was to evaluate the clinical wear rate of posterior acrylic denture teeth used in removable partial dentures, complete dentures, and overdentures. Methods: 30 patients, provided with removable partial dentures (n=21), complete dentures (n=11) or overdentures (n=4) were included in this study. Altogether, 204 posterior denture teeth (Vitapan, Vita Zahnfabrik, Bad Säckingen, Germany) were investigated. Gypsum casts (GC Fujirock EP Pearl White, Leuven, Belgium) were made from preliminary polyvinylsiloxane impressions (Flexitime, Heraeus Kulzer, Dormagen, Germany) after denture insertion (baseline data) and after a period of 6 months. Wear measurements were carried out from gypsum replicas using a 3D Laser Scanner (Willytec, Munich, Germany). Wear was calculated as the difference between the replica surfaces at 6 months and at baseline. Statistical analysis was performed using Mann-Whitney-U-Test (p=0.05). Results: The mean wear of all denture teeth was –20,5(14,6)µm. No significant differences in wear by gender (female: –19,5(13,5)µm / male: –22,1(16,0)µm) and the antagonistic material (acrylic denture tooth: –19,2(13,2)µm / resin veneering material: –24,5(16,6)µm / ceramic: –24,3(19,1)µm / enamel: –24,1(16,7)µm / others: –19,6(10,0)µm / no antagonist: –5,4(4,3)µm) were found. A separate analysis of the variable “type of denture” and the wear rate revealed slight differences (removable partial dentures: –22,7(14,9)µm / overdentures: –17,4(16,7)µm / complete dentures: –18,9(13,2)µm). The differences between removable partial dentures and overdentures were significant (p=0,01). Conclusions: The results indicate that the type of denture has a significant influence on the short time wear rate of acrylic denture teeth. | ||
| Seq #50 - Dental Materials: Physical Properties, Non - Polymers 2:00 PM-3:30 PM, Saturday, 28 August 2004 Crowne Plaza Hotel SEDIR III | ||
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