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KMID : 1023820180100050388
The Journal of Advanced Prosthodontics
2018 Volume.10 No. 5 p.388 ~ p.394
Digital evaluation of axial displacement by implant-abutment connection type: An in vitro study
Kim Sung-Jun

Son Keunbada
Lee Kyu-Bok
Abstract
PURPOSE: To measure axial displacement of different implant-abutment connection types and materials during screw tightening at the recommended torque by using a contact scanner for two-dimensional (2D) and three-dimensional (3D) analyses.

MATERIALS AND METHODS: Twenty models of missing mandibular left second premolars were 3D-printed and implant fixtures were placed at the same position by using a surgical guide. External and internal fixtures were used. Three implant-abutment internal connection (INT) types and one implant-abutment external connection (EXT) type were prepared. Two of the INT types used titanium abutment and zirconia abutment; the other INT type was a customized abutment, fabricated by using a computer-controlled milling machine. The EXT type used titanium abutment. Screws were tightened at 10 N¡¤cm, simulating hand tightening, and then at the manufacturers' recommended torque (30 N¡¤cm) 10 min later. Abutments and adjacent teeth were subsequently scanned with a contact scanner for 2D and 3D analyses using a 3D inspection software.

RESULTS: Significant differences were observed in axial displacement according to the type of implant-abutment connection (P<.001). Vertical displacement of abutments was greater than overall displacement, and significant differences in vertical and overall displacement were observed among the four connection types (P<.05).

CONCLUSION: Displacement according to connection type and material should be considered in choosing an implant abutment. When adjusting a prosthesis, tightening the screw at the manufacturers' recommended torque is advisable, rather than the level of hand tightening.
KEYWORD
Dental implant, Dental implant-abutment connection, Tightening torque, Axial displacement
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