13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

- Oral Presentation 147

TITLE: Resin tags appeared in dentin after Er,Cr:YSGG laser irradiation: a S.E.M study.

AUTHORS: Espanya D, Vincent J, Arnabat-Domínguez J, España A.

EMDOLA Barcelona, University of Barcelona. Máster de laser en Odontología. Facultat d’Odontologia

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S147.

* doi:10.4317/medoral.17643646

http://dx.doi.org/10.4317/medoral.17643646

Abstract

Purpose: Some authors do strongly believe in the importance of the resin tags length that infiltrate the tubular dentin in order to achieve the bonding process of the current restorative materials. The aim of this study was to compare the differences between resin tags length when using Er.Cr:YSGG laser and conventional drill, both of them being treated with and without dentin acid-etching.

Materials and methods: Sixteen human third molars were stored in saline solution just after being extracted. The oclusal face of their crown was sectioned below the dentino-enamel junction until dentin was exposed. The 16 samples were divided into 4 groups of 4 elements each. Two groups were treated with laser and the other two groups were drilled with a high speed handpiece. One of the lased groups was etched with 35% orthophosphoric acid, the same than one of the bur prepared group. All the samples were treated with a dentin bonding agent. The adhesive system Syntac (by Vivadent) in three steps (primer, adhesive and bond) and the filling material Cavex Clearfil (by Curaray) were bonded to the prepared surfaces. The samples were placed in receptacles containing chlorhydric acid at 30% for 24 hours. Afterwards, the remaining restorative material was analysed by the scanning electron microscope (SEM, Leika Stereoscan).

Results: The non etched lased dentin group showed the longest resin tags, between 100-200 µm of length, followed by the lased and etched dentin, with a 15-30 µm tags length, and the conventional drill and etched dentin, with the same tags length of 15-30 µm. The group treated by conventional drilling and without acid etching revealed absence of tags.

Conclusions: Samples prepared with acid etching, in both lased and drill groups, showed a similar micromorphology. The longest resin tags were obtained from the combination of lasing and etching dentin.