Bond strengths of customized titanium brackets manufactured by selective laser melting / 中华口腔医学杂志
Chinese Journal of Stomatology
;
(12): 419-422, 2013.
Article
in Chinese
| WPRIM
| ID: wpr-293563
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the bond strengths of customized titanium bracket manufactured by selective laser melting.</p><p><b>METHODS</b>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.</p><p><b>RESULTS</b>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.</p><p><b>CONCLUSIONS</b>The shear bond strength and tensile bond strength of both kinds of brackets were enough for clinic application.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Phosphoric Acids
/
Tensile Strength
/
Titanium
/
Acid Etching, Dental
/
Bicuspid
/
Random Allocation
/
Chemistry
/
Dental Bonding
/
Orthodontic Brackets
/
Dental Debonding
Type of study:
Controlled clinical trial
Limits:
Adolescent
/
Child
/
Humans
Language:
Chinese
Journal:
Chinese Journal of Stomatology
Year:
2013
Type:
Article
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