Abstract
BackgroundVinyl Polyether Siloxane is a newly introduced impression material and studies on that is scarce. Implant insertion in posterior mandible might be angulated due to anatomical considerations. The purpose of this study was to compare the dimensional and angular accuracy of impressions using full-arch versus sectional tray and Vinyl Polysiloxane versus Vinyl Polyether Siloxane in angulated implants.Material and MethodsFour implants were placed in dental areas #19, #21, #28 and #30 of a Kennedy class I mandibular acrylic model with 30° lingual angulation. Twenty sectional and 20 full-arch open trays were made on the primary cast. Impressions were taken using Vinyl Polysiloxane and Vinyl Polyether Siloxane (n=10 in 4 groups); and were poured with type IV dental stone. The coordinate measuring machine was used to measure displacements in the X, Y and Z axes and rotational discrepancies of implants. The data were analyzed using SPSS 22 and two-way ANOVA.ResultsType of tray had no significant effect on the dimensional and angular accuracy of impressions (p >0.05). Type of impression material significantly affected linear displacement (∆r) (P <0.05); but it did not significantly affect the rotational displacement (P >0.05).ConclusionsVinyl Polysiloxane yielded more accurate impressions of angulated implants. Key words:Dental implant, impression material, impression tray, vinyl polysiloxane, vinyl polyether silicone, coordinate measuring machine.
Highlights
Dental implant in the alveolar bone is not surrounded by the periodontal ligament, and assembly of prosthesis over the implant yields a structure composed of prosthetic superstructure, implant fixture and bone as one unit (1)
It is assumed that during taking impressions from angulated implants, full-arch trays would undergo greater distortion when removing the tray from bilateral undercuts and greater stress is created in the impression material, which may cause inaccuracies
Considering the information gap on the dimensional and angular accuracy of impressions taken with Vinyl Polyether Siloxane (VPES) and sectional tray, this study aimed to assess the accuracy of impressions taken from bilateral angulated implants using sectional versus full arch trays and PVES versus Vinyl Polysiloxane (VPS) impression materials
Summary
Dental implant in the alveolar bone is not surrounded by the periodontal ligament, and assembly of prosthesis over the implant yields a structure composed of prosthetic superstructure, implant fixture and bone as one unit (1). It is assumed that during taking impressions from angulated implants, full-arch trays would undergo greater distortion when removing the tray from bilateral undercuts and greater stress is created in the impression material, which may cause inaccuracies. In such cases, use of sectional tray may decrease impression errors since it covers fewer implants and is less flexible than the full-arch tray (2). The purpose of this study was to compare the dimensional and angular accuracy of impressions using full-arch versus sectional tray and Vinyl Polysiloxane versus Vinyl Polyether Siloxane in angulated implants. Conclusion: Vinyl Polysiloxane yielded more accurate impressions of angulated implants
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