Bond strengths of customized titanium brackets manufactured by selective laser melting.
- Author:
Dao-xing ZOU
1
;
Ze-min WANG
;
Hong-ming GUO
;
Song LI
;
Yu-xing BAI
Author Information
- Publication Type:Journal Article
- MeSH: Acid Etching, Dental; Adolescent; Bicuspid; Child; Composite Resins; chemistry; Dental Bonding; methods; Dental Debonding; Dentin-Bonding Agents; chemistry; Humans; Lasers; Orthodontic Brackets; Phosphoric Acids; chemistry; Random Allocation; Shear Strength; Tensile Strength; Titanium
- From: Chinese Journal of Stomatology 2013;48(7):419-422
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the bond strengths of customized titanium bracket manufactured by selective laser melting.
METHODSEighty 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.
RESULTSThe 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.
CONCLUSIONSThe shear bond strength and tensile bond strength of both kinds of brackets were enough for clinic application.
