Enamel and dentin irradiation with 9.6 µm CO2 and 2.94 µm Er:YAG lasers: bond strength evaluation

✍ Scribed by T. M. Marraccini; L. Bachmann; H. A. Wigdor; J. T. Walsh Jr.; M. L. Turbino; A. Stabholtz; D. M. Zezell

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 380 KB
• Volume: 3
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200510058

✦ Synopsis

Background and objective: The objective of this study
was to evaluate the bond strength between a composite resin and
dental hard tissues, which have been previously irradiated with an
Er:YAG (2.94 μm) or CO~2~ (9.6 μm) laser. Materials and
methods: A total of 156 bovine teeth were divided into 6 groups:
Group 1 – Enamel control: acid etched enamel (Single Bond); Group
2 – Dentin control: acid etched dentin (Single Bond); Group 3 –
Irradiated enamel (CO~2~ laser – 3 W) followed by acid etching;
Group 4 – Irradiated dentin (CO~2~ laser – 3 W) followed by
acid etching; Group 5 – Irradiated enamel (Er:YAG laser –
0.16 W) followed by acid etching; Group 6 – Irradiated dentin
(Er:YAG laser – 0.16 W) followed by acid etching. Results:
Treatment only with acid etching and also the Er:YAG laser
irradiation followed by acid etching showed the highest bond
strength value while the CO~2~ laser irradiation followed by acid
etching treatment produces the lowest bond strength values in both
tissues. Conclusion: Acid etching of non-irradiated and Erbium YAG
laser irradiated tissues produces better adhesion than acid
etching of CO~2~ laser irradiated surfaces.