ACABA DE SER PUBLICADA A TESE DA DENISE PONTES RALDI - PARABÉNS

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Feb;109(2):e154-61. Epub 2009 Dec 6.

Attachment of cultured fibroblasts and ultrastructural analysis of simulated cervical resorptions treated with high-power lasers and MTA.

Raldi DP, Mello I, Neves AC, Habitante SM, Miyagi SS, Lage-Marques JL.

Division of Endodontics, Department of Dentistry, University of Taubate, Taubate, Sao Paulo, Brazil. pontesdenise@uol.com.br

OBJECTIVE: The present study evaluated the fibroblast attachment and the morphologic changes of simulated cervical root resorptions after irradiation with high-power lasers and the use of mineral trioxide aggregate (MTA). STUDY DESIGN: Standardized cavities were done on the coronal third of 40 single-rooted teeth and assigned into 4 groups according to the treatment applied: (1) untreated control, (2) use of MTA, (3) irradiation with Er:YAG laser (42 mJ, 10 Hz, 10 s), and (4) irradiation with high-power diode laser (1 W, 10 s). Fragments were prepared for SEM analysis: 6 samples of each group were plated with human gingival fibroblasts and 4 samples were used for ultrastructural analysis. RESULTS: The cells' attachment was in decreasing order: G3 > G4 > G1> G2, with statistical differences among all groups (P < .05). The samples irradiated with Er:YAG exhibited roughness on the dentinal surface, no smear layer, and open dentinal tubules; those irradiated with diode laser exhibited a smooth surface, more smear layer, and closed dentinal tubules; and the control group showed high amount of smear layer and closed dentin tubules. CONCLUSIONS: Irradiation with Er:YAG and diode lasers caused morphologic changes on the dentinal surfaces of simulated resorptions that favored cells' adhesion. MTA showed lower biocompatibility than irradiated groups but allowed cells' adhesion. Copyright (c) 2010 Mosby, Inc. All rights reserved.

PMID: 19969481 [PubMed - in process]
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Feb;109(2):e154-61. Epub 2009 Dec 6