Microhardness evaluation of silorane and methacrylate composites submitted to erosion and abrasion processes

Figures & data

Table 1. Materials used in the study.

Material	Composition	pH	Manufacturer
Filtek Z250	Bis-GMA*, Bis-EMA (6)*, UDMA* and TEGDMA*. Zirconia and silica – 78.5%	–	3 M – ESPE, St. Paul, MN, USA
Filtek P90	Silorane (3,4-epoxy cyclohexylethyl siloxane,bis-3,4-epoxy cyclohexylethyl phenylmethyl silane). Quartz and yttrium – 76% – 0.47 μm	–	3 M – ESPE, St. Paul, MN, USA
Orange Juice (OJ)	Contains pure filtered water, premium concentrated orange juice, sugar, natural flavor, citric acid, ascorbic acid.	3.77	Minute Maid, Cia de Bebidas Ipiranga, Ribeirão Preto, SP, Brazil
Smirnoff Ice (SI)	4.5% alc/vol, water, sugar, citric acid, tartaric acid, sodium citrate, malic acid, sodium benzoate.	3.19	Viti Vinícula Cereser Ltd., Jundiaí, SP, Brazil
Gatorade (GA)	Water, saccharose, glucose, sodium chloride, sodium citrate, monobasic potassium phosphate, citric acid, flavorant.	3.24	Ambev, Jaguariuna, SP, Brazil
Colgate Luminous White	Aqua, hydrated silica, sorbitol, glycerin, pentasodium triphosphate, PEG-12, tetrapotassium pyrophosphate, sodium lauryl sulfate, aroma, cellulose gum, cocamidopryl betane, xanthan gum, sodium saccharin, sodium hydroxide, sodium fluoride (1100 ppm), RDA = 175.	–	Colgate Palmolive Industrial Ltd., São Bernardo do Campo, SP, Brazil

*Bis-GMA: bisphenol glycidyl methacrylate, TEGDMA: triethyleneglycol dimethacrylate, UDMA: urethane dimethacrylate, Bis-EMA: bisphenol ethoxylate dimethacrylate. Bis-EMA (6) is analogous to Bis-GMA; however, the former has six ethylene oxide units substituting the two hydroxyl groups between the aromatic backbone and the insaturates.

Table 2. Knoop hardness (KHN) means (standard deviations) in function of material and treatment.

Material	Control (G1–C)	Orange Juice (G2–OJ)	Smirnoff Ice (G3–SI)	Gatorade (G4–GA)
Filtek Z250	88.6 (9.6) Aa	89.7 (5.0) Aa	78.4 (9.4) Ba	83.6 (8.4) ABa
Filtek P90	55.6 (2.1) Ab	54.4 (3.7) Ab	54.9 (2.5) Ab	59.3 (2.3) Ab

Within the same material, means marked with the same capital letter were not significantly different. Within the same treatment, means marked with the same case letter were not significantly different.