The objective of this study is to evaluate microtensile bond strength of three different bonding systems to pulp chamber with or without Er;Cr:YSGG laser application.
Method:
Fourteen freshly extracted human mandibular molar teeth were used in this study. The teeth were separated vertically into two pieces to obtain flat pulp-chamber surfaces. The obtained twenty eight teeth halves were randomly divided into seven groups including four halves in each group.
Group 1: % 37 phosphoric acid + Single Bond (3M ESPE, St. Paul, Minn, USA), Group 2: Clearfil SE Bond (Kuraray, Tokyo, Japan), Group 3: Futura Bond (Voco, Cuxhaven, Germany), Group 4: Er;Cr:YSGG (Biolase Technology, Inc, San Clement, CA) + Single Bond, Group 5: Er;Cr:YSGG+ % 37 phosphoric acid + Single Bond, Group 6: Er;Cr:YSGG + Clearfil SE Bond, Group 7: Er;Cr:YSGG + Futura Bond. The pulp chambers of all groups were restored with Clearfil Majesty restorative material (Kuraray, Tokyo, Japan) and sectioned with diamond discs under copious water cooling to obtain 1 mm2 sized composite resin-dentin sticks. Ten stick specimens were obtained from each group. These stick specimens were subjected to microtensile bond strength testing.
Result:
Data were statistically analyzed using SAS program One-way ANOVA. Statistically significant difference was found between groups. The group bonded with FuturaBond after laser etching has shown the highest microtensile bond strength values (21.68 ± 1.427) while the group bonded with FuturaBond purely has demonstrated statistically lowest values (10.40 ± 1.399). t test was used to compare the microtensile bond strength of groups with or without laser application. The t test showed that laser etched groups have statistically higher microtensile bond strength values.
Conclusion:
The results have pointed out that laser etching improved microtensile bond strength.