Open AccessPreliminary testing for reduction of insertion torque of orthodontic mini-screw implant using diamond-like carbon films
Author(s) -
Chavin Jongwannasiri,
Taksid Charasseangpaisarn,
Shuichi Watanabe
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1380/1/012062
Subject(s) - materials science , diamond like carbon , torque , composite material , coating , nanotechnology , thin film , physics , thermodynamics
Nowadays, titanium alloy is widely used as orthodontic mini-screw implants due to its suitable mechanical properties and excellence in biocompatibility. However, the excessive torques applied during the insertion of orthodontic mini-screw implant can cause necrosis of the surrounding bone. In this article, the insertion torque of orthodontic mini-screw implants is aimed to reduce during treatment by means of surface coating. The three types of coatings, namely, DLC, F-DLC 2:1 and Si-DLC 2:1 coated on orthodontic mini-screw implants were chosen to take into account the insertion torque values compared with uncoated surface. The friction behaviors of the films in ambient air and dry air were assessed using ball-on-disk friction testing. Cytotoxicity tests were performed using MTT assay. The insertion torque values were measured by physiodispenser. The results indicated that, both measured in ambient air and dry air, the addition of F into the DLC films slightly influenced the friction coefficients, while doping with Si strongly influenced the films. These films also exhibited less cytotoxicity on their surfaces. Furthermore, the insertion torque values decreased when coated orthodontic mini-screw implants with F-DLC 2:1 and Si-DLC 2:1 films. Therefore, the F-DLC 2:1 and Si-DLC 2:1 films can be considered to apply on orthodontic mini-screw implant for reducing the insertion torque.