Bond strengths of customized titanium brackets manufactured by selective laser melting
10.3760/cma.j.issn.1002-0098.2013.07.009
- VernacularTitle:选区激光融化成形钛合金个性化舌侧托槽粘接强度初探
- Author:
Dao-Xing ZOU
1
;
Ze-Min WANG
;
Hong-Ming GUO
;
Song LI
;
Yu-Xing BAI
Author Information
1. 佛山市口腔医院正畸科
- Keywords:
Orthodontic brackets;
Tensile strength;
Shear strength;
Titanium;
Selective laser metling
- From:
Chinese Journal of Stomatology
2013;48(7):419-422
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the bond strengths of customized titanium bracket manufactured by selective laser melting.Methods Eighty human premolars which had been extracted for orthodontic purpose were collected and divided randomly (by random table) into two groups (customized bracket group and 3M bracket group,40 molars in each group).The 35％ phosphoric acid was used for etching and the brackets were bonded with 3M Unitek bonding adhesive.All bonded specimens were placed in saline for 24 hours at room temperature and were tested on DWD3050 electronic testing machine to determine the shear bond strength and tensile bond strength.After debonding,the adhesive remnant indexes (ARI) were recorded.Results The shear bond strengths of customized brackets was 6.80 (6.20,8.32) MPa,which was significantly lower than that of the 3M brackets [10.46 (9.72,11.48) MPa] (Z =-3.463,P ＜ 0.05).And the tensile bond strengths of customized brackets was (6.93 ± 1.21) MPa,which was significantly higher than that of the 3M brackets [(5.88 ± 1.23) MPa] (t =2.81,P ＜ 0.05).No significant difference was found in the ARI between two different kinds of the brackets.Conclusions The shear bond strength and tensile bond strength of both kinds of brackets were enough for clinic application.
