| Summary: | Home bleaching is whitening treatment of vital teeth conducted by a patient at
home with under control of a dentist. Home bleaching generally uses 15% carbamide
peroxide. Application of 15% carbamid peroxide is recommended 4 to 8 hours each
day, and the duration of application is for 2 to 4 weeks. Recently nanofil and
nanoceramic composite resin have been widely used in dentistry. In clinical
condition, sometimes patient who need bleaching treatment have already had
composite resin restoration on their anterior teeth. The purpose of this study was to
investigate the effect of application duration of 15% carbamid peroxide on the surface
roughness alteration of nanofil and nanoceramic composite resin.
This in vitro study was conducted using 40 specimens of composite resin. All
specimens were assigned into two groups (nanofil and nanoceramic), then each group
was divided into 4 groups of 5 each. Groups I and V as control groups, were
immersed in artificial saliva for 14 days, groups II and VI as control groups, were
immersed in artificial saliva for 21 days, groups III and VII were applied by 15%
carbamide peroxide for 6 hours/day and the duration of application was 14 days,
groups IV and VIII same as group III and VII except the duration of application was
21 days. The measurement of surface roughness was carried out before and after
application of 15% carbamid peroxide using stylus profilometer. The data was
obtained by subtracting the value of final and initial surface roughness test.
The results showed that type of composite resin influence surface roughness
(p=0,048) as well as application duration of the 15% carbamide peroxide (p=0,000).
The results of Mann-Whitney U-test showed that there were significant difference
between control groups and application 15% carbamide peroxide groups with
duration of application 14 and 21 days on the surface roughness alteration of nanofil
and nanoceramic composite resin (p<0,05).
At conclusion, application duration of 15% carbamide peroxide altered the
surface roughness of nanofil and nanoceramic composite resin.
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