Influence of polymerization time on properties of dual-curing cements in combination with high translucency monolithic zirconia.
J Prosthodont Res
; 62(4): 468-472, 2018 Oct.
Article
en En
| MEDLINE
| ID: mdl-29983378
ABSTRACT
PURPOSE:
The aim of this in vitro study was to assess conversion degree (DC), micro-hardness (MH) and bond strength of two dual-curing resin cements employed under translucent monolithic zirconia irradiated with different time protocols.METHODS:
84 square shaped samples of 1mm thickness were prepared from high translucency zirconia blocks and divided into two groups (n=24) according to the cement employed (1) Rely-X Ultimate; (2) Panavia SA. Each group was further divided into 3 subgroups (n=8) according to the irradiation time (a) no light; (b) 20s; (c) 120s. Light curing was performed 60s after the sample was placed on the diamond support of a FT-IR spectrophotometer with a high power multiLED lamp. Final DC% were calculated after 10min. After 24h, Vickers Test on the cement layer was performed. The same protocol was used to lute composite cylinders in order to evaluate microshear bond-strength test. ANOVA and Bonferroni tests were performed to find differences between MH and bond-strength to zirconia, while for DC% the Scheirer-Ray-Hare two-way test was used.RESULTS:
The two cements reached higher DC% in subgroup (b) and (c). As concern MH, statistics showed an increase in curing time was able to improve MH significantly. Bond-strength was not affected by irradiation time only for Panavia SA.CONCLUSIONS:
The first null hypothesis has to be rejected since DC% and MH of the dual-cements tested were influenced by the curing time. The second null hypothesis is partially rejected since the bond strength was influenced by the curing time only for Rely-X Ultimate.Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Resinas Sintéticas
/
Circonio
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Recubrimiento Dental Adhesivo
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Resinas Compuestas
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Cementos Dentales
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Polimerizacion
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Lansoprazol
Idioma:
En
Revista:
J Prosthodont Res
Asunto de la revista:
ODONTOLOGIA
Año:
2018
Tipo del documento:
Article
País de afiliación:
Italia