Bond strength of composites on Er:YAG and Er,Cr:YSGG laser-irradiated enamel

Christian Apel; Norbert Gutknecht

doi:10.1117/12.339156

4 February 1999 Bond strength of composites on Er:YAG and Er,Cr:YSGG laser-irradiated enamel

Christian Apel, Norbert Gutknecht

Proceedings Volume 3564, Medical Applications of Lasers in Dermatology, Cardiology, Ophthalmology, and Dentistry II; (1999) https://doi.org/10.1117/12.339156
Event: BiOS Europe '98, 1998, Stockholm, Sweden

Abstract

In an in vitro study the bond strength of composite materials on Er:YAG and Er,Cr:YSGG laser-radiated enamel was examined. The results achieved on enamel surfaces conditioned conventionally using the acid etching method served as a control. On 80 extracted cariesfree third molars an enamel area of 4 X 4 mm was conditioned with three different systems. The Er:YAG laser was used at pulse frequencies of 8 Hz, 10 Hz, 12 Hz and 15 Hz using an energy of 120 mJ at each setting. The Er,Cr:YSGG laser was used at the settings of 20 Hz/50 mJ, 20 Hz/100 mJ and 20 Hz/150 mJ. The repetition rate for this device is constantly 20 Hz. In the reference group 10 teeth were etched with 37% phosphoric acid. In order to be able to perform the tensile tests under standard conditions metal brackets were placed on the conditioned surfaces. The 'Orthodontic-Bonding-System' was used as an adhesive system. The brackets were pulled off from the etched surfaces vertically to the tooth using a tensile testing machine. The results confirmed the highest bond strengths in the group of enamel surfaces which have been conditioned with acid etching gel. The bond strength of the Er:YAG laser (8, 10 and 12 Hz)- and Er,Cr:YSGG laser (20 Hz/150 mJ)-conditioned enamel surfaces was not significantly lower.

Citation Download Citation

Christian Apel and Norbert Gutknecht "Bond strength of composites on Er:YAG and Er,Cr:YSGG laser-irradiated enamel", Proc. SPIE 3564, Medical Applications of Lasers in Dermatology, Cardiology, Ophthalmology, and Dentistry II, (4 February 1999); https://doi.org/10.1117/12.339156

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