EVALUATION OF THE INFLUENCE OF DIFFERENT IMPLANT ANGULATIONS ON THE ACCURACY OF AN IMPRESSION RECORDED USING VARIOUS VISCOSITIES OF ADDITION SILICONE IMPRESSION MATERIAL-AN IN-VITRO STUDY


Dr. Reshma Babu, Dr. Neelima Menon.S

ABSTRACT

INTRODUCTION: Implant with an axial orientation that is not in line with the needs of prosthetic rehabilitation may occur for various reasons. As a result, the impression procedure may be adversely influenced. Inaccuracies during impressions inevitably lead to laboratory errors resulting in lack of precision and misfit of the restoration.

AIM AND OBJECTIVES: The primary objective of the present study was to evaluate the comparative accuracy of pick-up impressions –mono phasic versus single stage/single stage double mix technique (multiple mix) of implants with different angulations and with a secondary objective to evaluate the effect of different viscosities of vinyl polysiloxane impression material on the accuracy of the impressions.

MATERIALS AND METHODOLGY: Four sets of two implant analogues were placed parallel to each other at various angulations at 00, 50 ,100 ,150.Sample size -64 and p value <0.05. Definitive impressions were made using vinyl polysiloxane of different consistencies with the following impression techniques. Soft putty body and light body, heavy body and light body, medium body and Bite registration along with soft putty body and light body .Profile projector was used to measure the distance between two reference points.

RESULT: It was seen that the accuracy of Putty –light body polysiloxane impression for  parallel to 5 degrees, bite registration material-putty-light body polysiloxane impression for 5- 10  degrees and heavy-light body polysiloxane impression for10-15 degree angulated implants impressions was higher. The p value is <0.05 indicating that the above was statistically significant.

CONCLUSION: Through this study it can be concluded that higher angulations of the implants more force is required to retrieve the impression. Also, more viscous the impression material lesser the displacement of impression copings thus higher the accuracy of impression made.

Key words: Implant angulation, Impression copings, Dimensional accuracy, Dental impression material