A precise impression is the preliminary requirement for the accurately fitting indirect dental restorations. The commonly used technique in making impression with silicone elastomer is putty- wash technique.
Aims and objectives: This study was conducted to evaluate the effect of thickness of the spacer used in putty-reline technique on the accuracy of the stone casts.
Materials and methods: The master model consisted of dentate mandibular arch acrylic typodont (Nissin) in which right mandibular first premolar was prepared to receive porcelain fused to metal fixed dental prosthesis. The sharply defined notches were prepared on the middle of buccocclusal and linguocclusal line angles of the abutment and in the middle of facial margins of the abutment. The width, height and interabutment distances were measured on the master model.
Results: The average height of the abutment on the group I, II and III stone casts are 5.618mm, 5.746mm and 5.778mm with standard deviation of 0.0764, 0.024 and 0.027 respectively as shown in table 1. Abutment height on group I, II and III stone casts deviated from that of master model by -1.25%, 1% and 1% respectively as is given in table 1. The abutment height measurements when subjected to one way ANOVA, p-Value was 0.0095 that is highly significant.
Conclusion: The clinical implication of this study is that desired wash bulk can create by the use of temporary crowns of desired thickness in the two step controlled putty reline technique. Further investigation is needed to determine the exact amount and technique of achieving wash space that is essential for accuracy in using two-step putty/wash impression techniques in conjunction with impression polyvinyl siloxane materials.