13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

- Oral Presentation 34

TITLE: The new CO₂ 9.6µ and Er:YAG 2.94µ laser on the enamel surface.

AUTHORS: Sahar-Helft S, Stabholz A, Moshonov J, Steinberg D.

Department of Endodontics, and the Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University-Hadassah, Jerusalem, Israel

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S34.

* doi:10.4317/medoral.17643533

http://dx.doi.org/10.4317/medoral.17643533

Abstract

Introduction: The Effect of a new CO₂ 9.6µ and Er:YAG 2.94µ laser on the enamel surface in vitro study. Aim: 1. Investigate the in vitro condition the efficacy of a new CO₂ laser 9.6µ on the enamel surface. 2. To compeer the efficacy of enamel ablation with the new laser C0₂ 9.6µ and Er:YAG laser. Material and Methods: molars teeth were collected divided into 2 groups of 30 teeth each. Our study examined irradiation of the teeth with two types of lasers. 1) A new 9.6µ wavelength CO₂ laser (Dentarey, Nathania Israel) was used in the study. A pulse energy of 10 Watt, a pulse width of 145 microseconds and pulse energy of 156.5mj. The irradiation time was 15 sec. 2) The Er:YAG laser 2.94µ wavelength (Opus 20 Yokneam Israel) with an output of 500 mj 12 pps for 15 sec. The dental enamel surfaces were lased in the coronal part. After irradiation samples were analyzed by scanning electron microscopy (SEM).

Results: Under the tested in vitro conditions, irradiation with Er:YAG laser demonstrated a deep crater in the enamel surface. It was noticed that the laser is efficient in drilling the enamel surface, but with no melting and wit out carbonization. The use of the new 9.6µ wavelength CO₂ laser showed from the floor of the crater showing enamel that was melted. The melted enamel was not homogenous and areas with re-solidified glo-bules can be observed. High magnification on the crater by Er:YAG laser demonstrate the digging of the laser beam inside the enamel surface It appears a life like appearance with relative sharp. No evidence of enamel melting can be observed. Higher magnification of the crater by CO₂ 9.6 µ, melted enamel presents a complete different structure then the non lased enamel. Conclusion: Based on our results it appears that Er:YAG laser irradiation demonstrated efficacy drilling on the enamel surface. CO₂ 9.6µ laser is presents a complete different structure a melted enamel.