Effect of different dental composite resins on the polymerization process


Autoria(s): RODRIGUES, T. P.; RASTELLI, A. N. S.; ANDRADE, M. F.; SAAD, J. R. C.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2009

Resumo

Dental composite resins possess good esthetic properties, and are currently among the most popular dental restorative materials. Both organic and inorganic phases might influence the material behavior, the filler particle features and rate are the most important factors related to improvement of the mechanical properties of resin composites. Thus, the objective of this study was to evaluate the effect of three different composite resins on the polymerization process by Vickers hardness test. The samples were prepared using three different composite resins, as follow: group I-P-60 (3M/ESPE); group II-Herculite XRV (Kerr), and group III-Durafill (Heraeus-Kulzer). The samples were made in a polytetrafluoroethylene mould, with a rectangular cavity measuring 7 mm in length, 4 mm in width, and 3 mm in thickness. The samples were photo-activated by one light-curing unit based on blue LEDs (Ultrablue III-DMC/Brazil) for 20 and 40 s of irradiation times. The Vickers hardness test was performed 24 h after the photo-activation until the standardized depth of 3 mm. The Vickers hardness mean values varied from 158.9 (+/- 0.81) to 81.4 (+/- 1.94) for P-60, from 138.7 (+/- 0.37) to 61.7 (+/- 0.24) for Herculite XRV, and from 107. 5 (+/- 0.81) to 44.5 (+/- 1.36) for Durafill composite resins photo-activated during 20 s for the 1st and 2nd mm, respectively. During 40 s of photo-activation, the Vickers hardness mean values were: from 181.0 (+/- 0.70) to 15.6 (+/- 0.29) for P-60, and from 161.8 (+/- 0.41) to 11.2 (+/- 0.17) for Herculite XRV composite resins, for the 1st and 3th mm, respectively. For Durafill composite resin the mean values varied from 120.1 (+/- 0.66) to 61.7 (+/- 0.20), for the 1st and 2nd mm, respectively. The variation coefficient (CV) was in the most of the groups lower than 1%, then the descriptive statistic analysis was used. The Vickers hardness mean values for Durafill were lower than P-60 and Herculite XRV composite resins for 20 and 40 s of irradiation time. The polymerization process was greatly affected by the composition of the composite resins.

FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo, SP, Brazil)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Identificador

LASER PHYSICS, v.19, n.12, p.2224-2229, 2009

1054-660X

http://producao.usp.br/handle/BDPI/30178

10.1134/S1054660X09230145

http://dx.doi.org/10.1134/S1054660X09230145

Idioma(s)

eng

Publicador

MAIK NAUKA/INTERPERIODICA/SPRINGER

Relação

Laser Physics

Direitos

restrictedAccess

Copyright MAIK NAUKA/INTERPERIODICA/SPRINGER

Palavras-Chave #LIGHT-CURING UNITS #ER-YAG LASERS #BOND STRENGTH #ACTIVATED RESIN #EMITTING-DIODE #DEPTH #CURE #CONVERSION #HALOGEN #RESTORATIONS #Optics #Physics, Applied
Tipo

article

original article

publishedVersion