Shear strength of the bond to primary dentin: influence of Er:YAG laser irradiation distance


Autoria(s): SCATENA, Camila; TORRES, Carolina Paes; GOMES-SILVA, Jaciara Miranda; CONTENTE, Marta Maria Martins Giamatei; PECORA, Jesus Djalma; PALMA-DIBB, Regina Guenka; BORSATTO, Maria Cristina
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

19/10/2012

19/10/2012

2011

Resumo

The aim of this study was to assess in vitro the influence of Er:YAG laser irradiation distance on the shear strength of the bond between an adhesive restorative system and primary dentin. A total of 60 crowns of primary molars were embedded in acrylic resin and mechanically ground to expose a flat dentin surface and were randomly assigned to six groups (n = 10). The control group was etched with 37% phosphoric acid. The remaining five groups were irradiated (80 mJ, 2 Hz) at different irradiation distances (11, 12, 16, 17 and 20 mm), followed by acid etching. An adhesive agent (Single Bond) was applied to the bonding sites, and resin cylinders (Filtek Z250) were prepared. The shear bond strength tests were performed in a universal testing machine (0.5 mm/min). Data were submitted to statistical analysis using one-way ANOVA and the Kruskal-Wallis test (p < 0.05). The mean shear bond strengths were: 7.32 +/- 3.83, 5.07 +/- 2.62, 6.49 +/- 1.64, 7.71 +/- 0.66, 7.33 +/- 0.02, and 9.65 +/- 2.41 MPa in the control group and the groups irradiated at 11, 12, 16, 17, and 20 mm, respectively. The differences between the bond strengths in groups II and IV and between the bond strengths in groups II and VI were statistically significant (p < 0.05). Increasing the laser irradiation distance resulted in increasing shear strength of the bond to primary dentin.

Identificador

LASERS IN MEDICAL SCIENCE, v.26, n.3, p.293-297, 2011

0268-8921

http://producao.usp.br/handle/BDPI/26449

10.1007/s10103-010-0776-y

http://dx.doi.org/10.1007/s10103-010-0776-y

Idioma(s)

eng

Publicador

SPRINGER LONDON LTD

Relação

Lasers in Medical Science

Direitos

restrictedAccess

Copyright SPRINGER LONDON LTD

Palavras-Chave #Er:YAG laser #Primary teeth #Dentin #Irradiation parameters #Bond strength #ER-YAG-LASER #COMPOSITE RESINS #ADHESIVE SYSTEMS #MORPHOLOGICAL-CHANGES #SURFACE-MORPHOLOGY #HARD SUBSTANCES #SEM EXAMINATION #HUMAN TEETH #WATER MIST #ABLATION #Engineering, Biomedical #Surgery
Tipo

article

original article

publishedVersion