A 24-month randomized clinical trial of a two- and three-step etch-and-rinse technique.
OBJECTIVE
This 24-month randomized paired tooth clinical study evaluated the performance of All Bond 3 used in the simplified (2-step) and full (3-step) versions.


METHODS
33 patients, with at least two similar sized non-carious cervical lesions participated in this study. A total of 66 restorations were placed, half using the 2-step All Bond 3 (AB3-2) and the other half using 3-step All Bond 3 (AB3-3). The restorations were placed incrementally using the composite resin Aelite. The restorations were evaluated at baseline and after 6, 12 and 24 months following the modified USPHS criteria. Statistical differences between the adhesive were tested using with McNemar's test and clinical performance over time for each material with the Fisher's exact test (alpha = 0.05).


RESULTS
After 24 months, six AB3-2 and four AB3-3 were rated as bravo for marginal discoloration but did not differ from each other significantly (P > 0.05). The retention rates at 24 months of AB3-2 and AB3-3 were 90.9% and 97.0%, respectively (P > 0.05).
School of Dentistry, Department of Restorative Dentistry, University Estadual de Ponta Grossa, Paraná, Brazil. reis_ale@hotmail.com
Alessandra
A
Reis
Diego
D
Mânica
Franciele
F
Ferneda
Roberto
R
Amaral
Rodrigo
R
Stanislawczuk
Adriana
A
Manso
Ricardo Marins
RM
De Carvalho
Alessandro D
AD
Loguercio
D000134:Acid Etching, Dental / Q000379:methods*; D000328:Adult; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003731:Dental Caries / Q000209:etiology; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods; D003807:Dentin Sensitivity / Q000209:etiology; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000379:methods*; D008297:Male; D008689:Methacrylates / Q000737:chemistry*; D008875:Middle Aged; D023861:Photography, Dental; D011446:Prospective Studies; D012008:Recurrence; D013499:Surface Properties; D019237:Tooth Cervix / Q000473:pathology; D014076:Tooth Diseases / Q000628:therapy; D055815:Young Adult
C485363:Aelite LS; C074864:All-Bond system; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates