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The Accuracy of Casts Obtained Using Different Impression Techniques and Impression Materials in Combined Parallel
Menaga V1, Babina Chirom2, Kangjam Gunadhar3
1Prosthodontics and Crown and Bridge, Thai Moogambigai Dental College and Hospital, Chennai, IND.
Cureus
|May 29, 2024
Summary
Vinylsiloxanether (VSE) impression material with an open tray technique, including sandblasting and adhesive coating, yielded more accurate casts than polyvinyl siloxane (PVS) for parallel implants. For angulated implants, impression technique, not material, significantly impacted cast accuracy.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Accurate dental casts are crucial for fabricating well-fitting implant prosthetics.
- Elastomeric impression materials like polyvinyl siloxane (PVS) and vinylsiloxanether (VSE) are commonly used.
- Impression techniques can influence the dimensional accuracy of casts, especially with angulated implants.
Purpose of the Study:
- To compare the accuracy of casts produced by PVS and VSE impression materials.
- To evaluate the effect of different impression techniques (closed tray, open tray, open tray with surface treatment) on cast accuracy.
- To assess accuracy for both parallel and angulated implant analogs.
Main Methods:
- An in vitro study using a reference model with parallel and 20-degree angulated implant analogs.
- 60 impressions were made using PVS and VSE materials with three techniques: closed tray, open tray, and open tray with sandblasting/adhesive.
- Inter-analog distances of casts were measured using a vision measuring machine and compared to the reference model.
Main Results:
- For both parallel and angulated implants, mean error rates decreased in the order of closed tray, open tray, and open tray with surface treatment techniques for both PVS and VSE.
- No significant difference in accuracy between PVS and VSE for parallel or angulated implants using closed or standard open tray techniques.
- VSE with the open tray, sandblasting, and adhesive coating technique showed significantly higher accuracy than PVS for parallel implants (P=0.033).
Conclusions:
- The open tray technique with sandblasting and adhesive coating, using VSE material, provides superior accuracy for parallel implants compared to PVS.
- For angulated implants, the impression technique significantly influences cast accuracy, with no significant difference between PVS and VSE materials.
- Optimizing impression techniques is critical for achieving accurate casts in implant dentistry, particularly with angulated placements.
