Shear bond strength of orthodontic attachments bonded to impacted teeth under in vivo and in vitro conditions.
OBJECTIVE
To evaluate and compare the shear bond strength (SBS) of stainless steel and gold-plated attachments to impacted lower third molars in vivo and in vitro with a light-cured orthodontic resin.


METHODS
Sixteen patients with bilaterally full soft tissue impaction of lower third molars were recruited on a voluntary basis from an oral and maxillofacial surgery department.


METHODS
A split-arch technique was used. Following surgical exposure of the crown, the tooth was luxated but not extracted. Then, two attachments (one stainless steel button and one gold-plated eyelet) were bonded to the labial enamel surface of the loosened tooth. Five minutes later, the luxated tooth was removed from its socket. In each patient, the impacted tooth on the other side was extracted, and attachments were bonded in vitro. The SBSs of the attachments were evaluated. For comparison, analysis of variance and multiple range tests were used (α = 0.05).


RESULTS
Statistically significant differences were evident in attachment adhesion to the impacted tooth surfaces among the four groups (p < 0.001). Superior SBS values were obtained for stainless steel button groups bonded in vitro. The mean bond strengths of the groups bonded in vitro were better than those of the same groups bonded in vivo.


CONCLUSIONS
Although the in vitro-bonded groups showed higher SBS values, adequate bond strength is possible with stainless steel buttons bonded in vivo.
Department of Orthodontics, Faculty of Dentistry, University of Ondokuz Mayis, Samsun, Turkey.
N
N
Arici
E
E
Bulut
D000293:Adolescent; D000328:Adult; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008964:Molar, Third / Q000473:pathology / Q000601:surgery; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D050793:Orthodontic Extrusion / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D013193:Stainless Steel / Q000737:chemistry; D013314:Stress, Mechanical; D014081:Tooth Extraction; D014095:Tooth, Impacted / Q000473:pathology* / Q000601:surgery; D055815:Young Adult
D006047:Gold Alloys; D019279:Resin Cements; D013193:Stainless Steel
bond strength; impacted teeth; in vitro bonding; in vivo bonding; orthodontic attachment