Effect of light curing tip distance and resin shade on microhardness of a hybrid resin composite.

Abstract:

:Resin composite shades and resin composite polymerization performed with a distanced light tip are factors that can affect polymerization effectiveness. This in vitro study aimed to evaluate the influence of curing tip distance and resin shade on the microhardness of a hybrid resin composite (Z250-3M ESPE). Forty-five resin composite specimens were randomly prepared and divided into nine experimental groups (n = 5): three curing tip distances (2 mm, 4 mm, and 8 mm) and three resin shades (A1, A3.5, and C2). All samples were polymerized with a continuous output at 550 mW/cm(2). After 24 hours, Knoop microhardness measurements were obtained on the top and bottom surfaces of the sample, with a load of 25 grams for 10 seconds. Five indentations were performed on each surface of each sample. Results showed that bottom surface samples light-cured at 2 mm and 4 mm presented significantly higher hardness values than samples light-cured at 8 mm. The resin shade A1 presented higher hardness values and was statistically different from C2. The resin shade A3.5 did not present statistical differences from A1 and C2. For the top surface, there were no statistical differences among the curing tip distances. For all experimental conditions, the top surface showed higher hardness values than the bottom surface. It was concluded that light curing tip distance and resin shade are important factors to be considered for obtaining adequate polymerization.

journal_name

Braz Oral Res

journal_title

Brazilian oral research

authors

Aguiar FH,Lazzari CR,Lima DA,Ambrosano GM,Lovadino JR

doi

10.1590/s1806-83242005000400012

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

302-6

issue

4

eissn

1806-8324

issn

1807-3107

pii

S1806-83242005000400012

journal_volume

19

pub_type

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