Influence of luting agents on time required for cast post removal by ultrasound: an in vitro study
J. appl. oral sci
; J. appl. oral sci;17(3): 145-149, May-June 2009. ilus, tab
Article
en En
| LILACS
| ID: lil-514023
Biblioteca responsable:
BR1.1
ABSTRACT
OBJECTIVE:
This in vitro study evaluated the influence of luting agents on ultrasonic vibration time for intraradicular cast post removal. MATERIAL ANDMETHODS:
After endodontic treatment, 30 roots of extracted human canines were embedded in resin cylinders. The post-holes were prepared at 10 mm depth and their impressions were taken using autopolymerizing acrylic resin. After casting procedures using a nickel-chromium alloy, the posts were randomly distributed into 3 groups (n=10) according to the lutingmaterial:
G1- zinc phosphate (SS White) (control group), G2 - glass ionomer cement (Vidrion C; SS White), and G3- resin cement (C&B; Bisco). In G3, the adhesive procedure was performed before post cementation. After 24 h, the cement line was removed at the post/tooth interface using a fine diamond bur, and the ST-09 tip of an Enac ultrasound unit was applied at maximum power on all surfaces surrounding the posts. The application time was recorded with a chronometer until the post was completely dislodged and data were analyzed by ANOVA and Tukey's test (p<0.05).RESULTS:
The roots were removed from the acrylic resin and inspected to detect cracks and/or fractures. The means for G1, G2, and G3 were 168.5, 59.5, and 285 s, respectively, with statistically significant differences among them. Two G3 posts resisted removal, one of which developed a vertical fracture line.CONCLUSIONS:
Therefore, the cement type had a direct influence on the time required for ultrasonic post removal. Compared to the zinc phosphate and glass ionomer cements, the resin cement required a longer ultrasonic vibration time.Palabras clave
Texto completo:
1
Base de datos:
LILACS
Asunto principal:
Cemento de Fosfato de Zinc
/
Técnica de Perno Muñón
/
Desconsolidación Dental
/
Cementos de Resina
/
Cementos de Ionómero Vítreo
Idioma:
En
Revista:
J Appl Oral Sci
/
J. appl. oral sci
/
J. appl. oral sci. (Online)
/
Journal of applied oral science (Impresso)
Asunto de la revista:
ODONTOLOGIA
Año:
2009
Tipo del documento:
Article