Effect of cervical relining of acrylic resin copings on the accuracy of stone dies obtained using a polyether impression material.
The purpose of this study was to evaluate the accuracy of the respective dies after polyether elastomeric procedure in the presence or absence of cervical contact of the acrylic resin shell with the cervical region, establishing a comparison to dies obtained with stock trays. This study consisted of three groups with 10 specimens each: 1) acrylic copings without cervical contact, (cn); 2) acrylic copings with cervical contact (cc); 3) perforated stock tray, (st). The accuracy of the resulting dies was verified with the aid of a master crown, precisely fit to the master steel die. ANOVA test found statistically significant differences among groups (p<0.001). Tukey's test found that the smallest discrepancy occurred in group cn, followed by cc, while the st group presented the highest difference (cc x cn: p=0.007; st x cn: p<0.001; st x cc: p<0.001).
de Sá
André Tomazini Gomes
AT
Discipline of Restorative Dentistry, Londrina School of Dentistry, State University of Londrina, PR, Brazil.
de Freitas
César Antunes
CA
de Sá
Fátima Cristina
FC
Ursi
Wagner José Silva
WJ
Simões
Tânia Christina
TC
de Freitas
Márcia Furtado Antunes
MF
D000180:Acrylic Resins / Q000737:chemistry*; D002133:Calcium Sulfate / Q000737:chemistry*; D002858:Chromium Alloys / Q000737:chemistry; D003442:Crowns; D000044:Dental Abutments; D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique / Q000295:instrumentation; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003823:Denture Rebasing; D020724:Elastomers / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry; D003765:Models, Dental; D012117:Resins, Synthetic / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties; D019231:Tooth Preparation, Prosthodontic / Q000145:classification
D000180:Acrylic Resins; D002858:Chromium Alloys; D003760:Dental Impression Materials; D003764:Dental Materials; D020724:Elastomers; C022821:Impregum; D008768:Methylmethacrylates; D012117:Resins, Synthetic; D013193:Stainless Steel; C034578:Duralay; D002133:Calcium Sulfate