13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

- Oral Presentation 137

TITLE: Study on selective caries removal with Er:YAG laser using experimental Caries-detecting-dye-solutions.

AUTHORS: Yoshikawa K, Yasuo K, Iwata N, Awazu K, Yamamoto K.

Department of Operative Dentistry, Osaka Dental University, Osaka, Japan. Graduate School of Engineering, Osaka University, Osaka Japan

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S137.

* doi:10.4317/medoral.17643636

http://dx.doi.org/10.4317/medoral.17643636

Abstract

Introduction: Focusing on the specific absorption of lasers, we previously reported that the rate of laser absorption improved using a green CDS, and we revealed that the Er:YAG laser absorption improved by mixing compounds containing the highly laser-absorptive substances (HLA) with CDS. In this study, we experimentally produced CDS with HLA, and measured their Er:YAG laser efficiency of caries dentin removal, to evaluate the laser absorption properties of CDS with HLA.

Methods: We experimentally produced CDS mixed with 1.0, 2.0, and 4.0% HLA. The bovine dentin specimens were immersed in 0.1 M lactic acid for 24 hours, and the artificial carious dentin was produced. After dropping CDS, we removed the artificial carious dentin using Er:YAG laser irradiations were carried out at 1.0 W ,1 Hz. Erwin AdvErL was used as an Er:YAG laser apparatus (Morita, Japan). Formed cavities were measured using a 3D-morphological measurement apparatus, to investigate the removal volume. The data calculated were statistically evaluated using one-way variance analysis and Scheffe’s test (n=5).

Results: The removal volume on Er:YAG laser irradiation rose with increases in the concentration of HLA in CDS. The removal volume by Er:YAG laser was significantly higher with CDS at 4.0%(32±6.6mm³) than at another concentrations of HLA.

Conclusion: Our results suggest the possibility that dental caries can be selectively removed by Er:YAG laser using CDS mixed with HLA.