Influence of operating microscope in the sealing of cervical perforations.
BACKGROUND
Accidental root canal perforations are among the main complications of endodontic treatment.


OBJECTIVE
This study evaluated the influence of operating microscope (OM) in the marginal adaptation of mineral trioxide aggregate (MTA) (Angelus(®)) and glass ionomer (Vitremer) inserted into cervical perforations.


METHODS
Perforations were made in the cervical third of the buccal wall of the root canal in mandibular incisors. Next, the teeth were divided into four groups (N = 10): MG - MTA without OM; VG - Vitremer without OM; MOMG - MTA with OM; VOMG - Vitremer with OM. The perforations were sealed according to the group and the teeth were prepared for analysis by confocal laser scanning microscope. Images of perforation region (1,024×) were made and the gap presented by the materials was measured using the Image J program. LEXT OLS4100 three dimensional (3D) measuring laser microscope measured the volumetric misfit. Data of gap were analyzed by Kruskal-Wallis and Dunn's tests. Analysis of variance (ANOVA) and Tukey's tests compared the volumetric misfits.


RESULTS
The results showed lower volume and gap in the interface dentin/material in VOMG compared to the other groups (P < 0.05).


CONCLUSIONS
The use of OM improved the quality of cervical perforations sealed with Vitremer, being indicated in clinical situations of iatrogenic cervical perforations.
Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Bruna Schwingel
BS
Schmidt
Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Ivana Maria
IM
Zaccara
Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Marcus Vinícius
MV
Reis Só
Department of Restorative Dentistry, Araraquara Dental School, UNESP - Paulista State University, Araraquara, Brazil.
Milton Carlos
MC
Kuga
Department of Restorative Dentistry, Ribeirão Preto Dental School, USP - São Paulo University, Ribeirão Preto, São Paulo, Brazil.
Regina Guenka
RG
Palma-Dibb
Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Patrícia Maria Poli
PM
Kopper
Confocal laser scanning microscopy (CLSM); glass ionomer; mineral trioxide aggregate (MTA); operating microscope (OM)