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Published on: April 29, 2014
Dimensional accuracy of vinyl polyether and polyvinyl siloxane impression materials in direct implant impression
Rohini Rajendran1, N Gopi Chander1, Kuttae Vishwanathan Anitha1
1Department of Prosthodontics, SRM Dental College, Chennai, TamilNadu, India.
Purpose:
The present study compared the dimensional accuracy of vinyl polyether silicone (VPES) and polyvinyl siloxane (PVS) impression materials used for non-splinted (NS) and splinted (S) direct open-tray impression techniques for multiple implants inserted in simulated edentulous mandibles.
Materials And Methods:
A mandibular stainless steel model with eight internal connections for implant analogs was fabricated to simulate a clinical scenario. The acrylic resin splinted and non-splinted direct impressions were obtained for both VPES and PVS materials. Seventy-two cast samples were divided into four groups based on the impression techniques and materials used. The dimensional accuracies of the casts were measured in three different axes using a computerized coordinate measuring machine (CMM), and were statistically compared.
Results:
The differences in the distortion values between the VPES and PVS impression materials were not statistically significant. Similarly, the differences between the splinted and non-splinted groups among the VPES and PVS materials were not statistically significant.
Conclusion:
The casts fabricated from VPS or PVS impression materials provide similar dimensional accuracy regardless of the implant splinting method.
