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KMID : 0362220100370030191
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Journal of The Korean Research Society for Dental Materials
2010 Volume.37 No. 3 p.191 ~ p.198
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Effects of the Curing Methods of the Soft Denture Lining Materials on Setting Rate and Shore A Hardness
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Ahn Hyun-Jeong
Han Ok-Sung
Kim Ji-Woo
Kim Min-Kang
Song Ho-June
Yang Hong-So
Park Young-Jun
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Abstract
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The purpose of this study was to evaluate the setting rate and time-dependent Shore A hardness changes of
the silicone-based resilient denture lining materials (Self-curing: Mucosoft®, Sofreliner® Tough M; Heat-curing:
Mucopren® soft, Molloplast® B). The setting behaviors of the resilient denture liners (RDL) were evaluated
using an oscillating rheometer. For Shore A hardness test, disc-shaped RDL specimens (D 35 × T 6 mm) were
fabricated in aluminum molds. Shore A hardness was determined after 1 day and 28 days of water storage at
37±1℃ and measured using a shore A durometer. Within self-cured RDL groups, Sofreliner Tough M showed
slower c u ring r ate compared t o that o f Mu cosoft as s hown w ith their scorch t ime as 3 a nd 2 m inu tes,
respectively. Their setting time was about 5 min, which is similar to that of the manufacturers’ recommended
curing time. They showed similar flexibility with a resistance torque value as about 12 lb·in. Heat-cured RDLs
(Mucopren® soft and Molloplast® B) showed significantly higher torque values (16.5 and 19.4 lb·in, respectively)
comparing to those of self-cured RDLs (p<0.05). All the RDLs tested in this study could be classified
a s ISO Type A ( soft), and t he S hore A h ardness valu es o f the heat-cured material (Molloplast® B,
Mucopren® soft) were significantly higher than those of the self-cured material (Mucosoft®, Sofreliner® Tough
M)(p<0.05). For all the tested RDL groups, the hardness values measured after 28 days of water storage were
similar with those measured after 1 day of water storage (p>0.05). There was a positive correlation between
resistance t orqu e valu es a nd 2 4h-5s Shore A hardness valu es [ r= 0 .80, p= 0.20; resistance torque =
0.82×(Shore A hardness value) - 14.11]
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KEYWORD
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Curing condition, Resilient denture liners, Setting behavior, Shore A hardness
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