title: Improving the long-term stability of Ti6Al4V abutment screw by coating micro/nano-crystalline diamond films.
abstract: Abutment screw loosening is the most common complication of implanting teeth. Aimed at improving the long-term stability of them, well-adherent and homogeneous micro-crystalline diamond (MCD) and nano-crystalline diamond (NCD) were deposited on DIO(®) (Dong Seo, Korea) abutment screws using a hot filament chemical vapor deposition (HFCVD) system. Compared with bare DIO(®) screws, diamond coated ones showed higher post reverse toque values than the bare ones (p<0.05) after cyclic loading one million times under 100N, and no obvious flaking happened after loading test. Diamond coated disks showed lower friction coefficients of 0.15 and 0.18 in artificial saliva when countered with ZrO2 than that of bare Ti6Al4V disks of 0.40. Though higher cell apoptosis rate was observed on film coated disks, but no significant difference between MCD group and NCD group. And the cytotoxicity of diamond films was acceptable for the fact that the cell viability of them was still higher than 70% after cultured for 72h. It can be inferred that coating diamond films might be a promising modification method for Ti6Al4V abutment screws.
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha 410083, PR China.
authors.forename: Youneng
authors.initials: Y
authors.lastname: Xie
authors.affiliation: Changsha Stomatological Hospital, Changsha 410008, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha 410083, PR China. Electronic address: qiupwei@csu.edu.cn.
authors.forename: Qiuping
authors.initials: Q
authors.lastname: Wei
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha 410083, PR China. Electronic address: zhiming@csu.edu.cn.
authors.forename: Z M
authors.initials: ZM
authors.lastname: Yu
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha 410083, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Luo
authors.affiliation: School of Materials Science and Engineering, Central South University, Changsha 410083, PR China.
authors.forename: Bo
authors.initials: B
authors.lastname: Zhou
authors.affiliation: Xiangya Stomatological Hospital, Central South University, Changsha 410078, PR China. Electronic address: tangzhangui@aliyun.com.
authors.forename: Z G
authors.initials: ZG
authors.lastname: Tang
mesh_terms: D000497:Alloys; D000818:Animals; D017209:Apoptosis; D001863:Bone Screws; D002460:Cell Line; D018130:Diamond / Q000737:chemistry*; D005347:Fibroblasts; D051379:Mice; D053758:Nanoparticles / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; C031462:titanium alloy (TiAl6V4); D018130:Diamond; D014025:Titanium
keywords: Biocompatibility; Friction coefficient; HFCVD; Long-term stability; MCD; NCD