TY - JOUR
T1 - Influence of Nd
T2 - YAG laser irradiation on microtensile bond strength of adhesive systems to sound or carious dentin
AU - Paranhos, Maria Paula Gandolfi
AU - Spohr, Ana Maria
AU - Marcondes, Maurem
AU - Oshima, Hugo Mitsuo Silva
AU - Mota, Eduardo Gonçalves
AU - Burnett, Luiz Henrique
PY - 2009
Y1 - 2009
N2 - Objective: To evaluate the microtensile bond strength of 2 adhesive systems (Adper Single Bond Plus [3M ESPE] and Clearfil SE Bond [Kuraray]) to carious or normal dentin, with or without previous treatment with Nd: YAG laser or Nd: YAG laser associated with fluoride. Method and Materials: Dentin surfaces of 60 human third molars were exposed. Teeth were divided into 12 groups; groups 1 to 6 were submitted to pH cycling for artificial caries, and groups 7 to 12 remained with normal dentin. Dentin surfaces received 3 treatments: laser Nd: YAG irradiation (60 mJ, 15 Hz, and 0.9 W) for 1 minute; laser Nd: YAG irradiation associated with fluoride in gel; and no treatment (controls). In experimental groups, adhesive systems were applied in accordance with the manufacturers' instructions, and a composite resin block (Filtek Z250, 3M ESPE) was made incrementally for the microtensile bond strength test. The teeth were sectioned serially in both x and y directions, and sticks were submitted to microtensile bond strength testing in a universal testing machine. Results: According to ANOVA and Tukey (P < .05), the highest mean bond strengths were obtained in groups of normal dentin treated with Clearfil SE Bond (40.65 MPa) and Single Bond (34.2 MPa). The presence of carious dentin significantly decreased the mean bond strengths of the 2 adhesive systems whether or not they were previously laser irradiated. Nevertheless, Clearfil SE Bond presented the best microtensile bond strength on an irradiated surface. Moreover, laser irradiation associated with fluoride also decreased the bond strength values of the 2 adhesive systems. Conclusion: After excavating a cavity with caries-affected dentin, the use of Nd: YAG laser followed by a self-etching adhesive system is the best clinical choice when considering bond strength, compared with the total etching- based system and laser.
AB - Objective: To evaluate the microtensile bond strength of 2 adhesive systems (Adper Single Bond Plus [3M ESPE] and Clearfil SE Bond [Kuraray]) to carious or normal dentin, with or without previous treatment with Nd: YAG laser or Nd: YAG laser associated with fluoride. Method and Materials: Dentin surfaces of 60 human third molars were exposed. Teeth were divided into 12 groups; groups 1 to 6 were submitted to pH cycling for artificial caries, and groups 7 to 12 remained with normal dentin. Dentin surfaces received 3 treatments: laser Nd: YAG irradiation (60 mJ, 15 Hz, and 0.9 W) for 1 minute; laser Nd: YAG irradiation associated with fluoride in gel; and no treatment (controls). In experimental groups, adhesive systems were applied in accordance with the manufacturers' instructions, and a composite resin block (Filtek Z250, 3M ESPE) was made incrementally for the microtensile bond strength test. The teeth were sectioned serially in both x and y directions, and sticks were submitted to microtensile bond strength testing in a universal testing machine. Results: According to ANOVA and Tukey (P < .05), the highest mean bond strengths were obtained in groups of normal dentin treated with Clearfil SE Bond (40.65 MPa) and Single Bond (34.2 MPa). The presence of carious dentin significantly decreased the mean bond strengths of the 2 adhesive systems whether or not they were previously laser irradiated. Nevertheless, Clearfil SE Bond presented the best microtensile bond strength on an irradiated surface. Moreover, laser irradiation associated with fluoride also decreased the bond strength values of the 2 adhesive systems. Conclusion: After excavating a cavity with caries-affected dentin, the use of Nd: YAG laser followed by a self-etching adhesive system is the best clinical choice when considering bond strength, compared with the total etching- based system and laser.
KW - Caries
KW - Dentin
KW - Dentin-bonding agents
KW - Laser
KW - Tensile strength
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M3 - Article
C2 - 19169447
AN - SCOPUS:67650155391
SN - 0033-6572
VL - 40
SP - 145
EP - 153
JO - Quintessence international
JF - Quintessence international
IS - 2
ER -