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J Korean Acad Prosthodont. 2018 Jul;56(3):179-187. Korean. Original Article. https://doi.org/10.4047/jkap.2018.56.3.179
Yi HG , Gil KS , Lee JJ , Ahn SG , Seo JM .
Department of Prosthodontics, School of Dentistry and Institute of Oral Bio-Science, Chonbuk National University, Jeonju, Republic of Korea. jmseo@jbnu.ac.kr
Abstract

Purpose

The purpose of this study was to investigate the effect of heat applied to disintegrate cement on the removal torque value and fracture strength of titanium abutment and abutment screw.

Materials and methods

Implants, titanium abutments and abutment screws were prepared for each 20 piece. Implant abutments and screws were classified as the control group in which no heat was applied and the experimental group was heated in a vacuum furnace to 450℃ for 8 minutes and cooled in air. The abutments and screws were connected to the implants with 30 Ncm tightening torque at interval 10 minutes and the removal torque value was measured 15 minutes later. And the fracture strength of abutment screw was measured using universal testing machine.

Results

The mean removal torque value was 27.84 ± 1.07 Ncm in the control group and 26.55 ± 1.56 Ncm in the experimental group and showed statistically significant difference (P < .05). The mean fracture strength was 731.47 ± 39.46 N in the control group and 768.58 ± 46.73 N in the experimental group and showed statistically no significant difference (P > .05).

Conclusion

The heat applied for cement disintegration significantly reduced the removal torque value of the abutment screw and did not significantly affect fracture strength of the abutment screw. Therefore, in the case of applying heat to disintegrate cement it is necessary to separate the abutment screw or pay attention to the reuse of the heated screw. However further studies are needed to evaluate the clinical reuse of the heated screw.

Copyright © 2019. Korean Association of Medical Journal Editors.