Title

Comparative evaluation of implant abutment positional accuracy using three impression techniques - An in vitro study

Authors

Vishnuvardhan Venkatachalam^1,*, Giri Chandramohan², Aparna Mohan², C. Celin Joel², Y.S. Saranya² & K. Vennila³

Affiliation

¹Department of Prosthodontics and Crown & Bridge, KSR Institute of Dental Science and Research, Tiruchengode, Tamil Nadu, India; ²Department of Prosthodontics and Crown & Bridge, Sree Mookambika Institute of Dental Sciences, Kulasekharam, Tamil Nadu, India; ³Department of Periodontics, Vivekanandha Dental College for Women, Tiruchengode, Tamil Nadu, India; *Corresponding author

Email

Vishnuvardhan Venkatachalam - E-mail: vishnuvardhanviji@gmail.com; Phone: +91 97501 80804

Giri Chandramohan - E-mail: giritc@yahoo.com; Phone: +91 98436 45654

Aparna Mohan - E-mail: aparraj1972@gmail.com; Phone: +91 94431 84674

C. Celin Joel - E-mail: joeldhurai@gmail.com; Phone: +91 97516 46908

Y.S. Saranya - E-mail: dr.saranyays1@gmail.com; Phone: +91 97444 93601

K. Vennila - E-mail: vennilamds@gmail.com; Phone: +91 94861 60525

Article Type

Research Article

Date

Received July 1, 2026; Revised July 31, 2026; Accepted July 31, 2026, Published July 31, 2026

Abstract

Bone-level implants were strategically positioned in the lower premolar and molar regions to create a master model using clear epoxy resin and the control group consisted of non-hex abutments alongside UCLA castable hex abutments for casting setup. Therefore, it is of interest to compare the positional accuracy of implants abutments using three different impression methods: closed tray, closed tray with snap cap and closed tray with clip-on. Subsequently, ten impressions per technique (totaling 30 samples) were made using addition silicone and dental stone casts were then produced and their accuracy was evaluated using a three-dimensional model scanner. The data obtained from this analysis underwent statistical processing through Geomagic software, along with analyses conducted in Microsoft Excel and SPSS version 22. Thus, data shows the critical importance of positional accuracy, revealing significant difference among the three techniques, with the closed tray with clip-on techniques achieving superior accuracy, especially for hex groups emphasizing the significance of precise impressions for successful implant prostheses.

Keywords

Implant impression technique accuracy, closed tray impression technique, direct transfer, snap on, clip on, hex abutment, 3D model scanner, geomagic software

Citation

Venkatachalam et al. Bioinformation 22(7): 4253-4257 (2026)

Edited by

Rashmi Laddha

ISSN

0973-2063

Publisher

Biomedical Informatics

License

This is an Open Access article which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. This is distributed under the terms of the Creative Commons Attribution License.