R S Freiberg1, J L Ferracane. 1. Department of Biomaterials and Biomechanics, Oregon Health Sciences University, Portland 97201, USA.
Abstract
PURPOSES: (1) To evaluate the degree of conversion (DC) and the physical properties of a new dental composite, Artglass (Kulzer), designed primarily as a replacement material for porcelain in PFMs; and (2) to compare the efficacy of two different curing units for two dissimilar composites (Artglass and Charisma, Kulzer). MATERIALS AND METHODS: Specimens (n = 10) were prepared by curing either in a continuous light exposure unit (Triad II, Dentsply) or in a high intensity strobe unit (Uni XS, Kulzer) for 180 s. Specimens were aged 24 hrs in water at 37 degrees C and tested for fracture toughness (FT-MPa m1/2; x-head = 0.13 mm/min), flexural modulus (E, GPa), flexural strength (FS, MPa; x-head = 0.5 mm/min), hardness (KHN, kg/mm2), and in vitro wear resistance (OHSU oral wear simulator). DC (%) was determined by transmission micro-FTIR. Results were compared by ANOVA/Turkey's test (P < or = 0.05). RESULTS: DC, FT, E and FS were improved for Artglass and DC and E were improved for Charisma when the strobe curing unit was used, probably due to its increased intensity. Artglass showed a greater DC and FT but a lower E, KHN and wear resistance compared to Charisma when similar curing methods were used.
PURPOSES: (1) To evaluate the degree of conversion (DC) and the physical properties of a new dental composite, Artglass (Kulzer), designed primarily as a replacement material for porcelain in PFMs; and (2) to compare the efficacy of two different curing units for two dissimilar composites (Artglass and Charisma, Kulzer). MATERIALS AND METHODS: Specimens (n = 10) were prepared by curing either in a continuous light exposure unit (Triad II, Dentsply) or in a high intensity strobe unit (Uni XS, Kulzer) for 180 s. Specimens were aged 24 hrs in water at 37 degrees C and tested for fracture toughness (FT-MPa m1/2; x-head = 0.13 mm/min), flexural modulus (E, GPa), flexural strength (FS, MPa; x-head = 0.5 mm/min), hardness (KHN, kg/mm2), and in vitro wear resistance (OHSU oral wear simulator). DC (%) was determined by transmission micro-FTIR. Results were compared by ANOVA/Turkey's test (P < or = 0.05). RESULTS: DC, FT, E and FS were improved for Artglass and DC and E were improved for Charisma when the strobe curing unit was used, probably due to its increased intensity. Artglass showed a greater DC and FT but a lower E, KHN and wear resistance compared to Charisma when similar curing methods were used.
Authors: Paula Barbosa Alves; William Cunha Brandt; Ana Christina Claro Neves; Leonardo Gonçalves Cunha; Lais Regiane Silva-Concilio Journal: Eur J Dent Date: 2013-01