13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

-  Poster 68

TITLE: Cleaning the root-end cavity prepared with ultrasonics using Er:YAG laser irradiation.

AUTHORS: Watanabe S, Kokuzawa C, Gombo B, Saegusa T, Ebihara A, Suda H.

Pulp Biology and Endodontics, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S216.

* doi:10.4317/medoral.17643716

http://dx.doi.org/10.4317/medoral.17643716

Abstract

Aim: To investigate the removal of smear layer on the rootend cavity prepared with ultrasonics by Er:YAG laser irradiation through a bent probe for various time.

Methodology: Forty roots of extracted human anterior teeth were used. After the tooth crown was removed, the length of the root was adjusted to 9 mm. The root canal was prepared using the conventional method and obturated with gutta-percha and root canal sealer (Sealapex, Sybron Endo, USA).Then, 3 mm of the root-end was resected, and a root-end cavity was prepared using ultrasonics (Piezon Master 400, EMS, Switzerland, moderate power setting).After the preparation, Er:YAG laser (Erwin AdvErL, Morita, Japan, 100 mJ 10 pps) was irradiated to the root-end cavity for 0, 20, 40 and 80s through a bent probe (CF600, Morita). The samples were observed by SEM (S-4500, Hitachi, Japan) and scored for the presence or absence of the smear layer on the root-end cavity surface. Data were analyzed by using Kruskal-Wallis test (p=0.05).

Results: The cavitiy surfaces irradiated for 0 and 20s were covered with the smear layer, and those irradiated for 40 and 80s showed cleanliness of the cavity walls, with dentinal tubules open. There were significant differences among the experimental groups (p<0.05).

Conclusions: Depending on irradiation time, Er:YAG laser irradiation through a bent probe could remove the smear layer on the root-end cavity surface prepared by ultrasonics.