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A STUDY ON THE EFFECT OF THERMOCYCLING TO THE PHYSICAL PROPERTIES OF DENTURE LINERS 열 순환에 따른 의치이장재의 물리적 성질의 변화에 관한 연구
Dong-Su Lee, Heon-Song Lim, Ju-Hwan Lim, In-Ho Cho
이동수, 임헌송, 임주환, 조인호

For the improvement of denture fitness of changed residual ridge, denture liner can be used. Denture
liner should be very stable physically in various environments of the mouth as well as be bond-
ed strongly with denture resin.
In this study, the specimens bonded with four kinds of soft denture liner and three kinds of hard
denture liner were used to test the physical properties of the liners. All experimental groups were
stored in 37±1℃ distilled water for 24hours, followed by thermocycling between 15℃ and 45℃
with 15 second dwell time. 1000, 2000, 3000 cycles of thermocycling were excuted and physical
properties were measured by Instron Universal Testing Machine. The obtained results were as
follows:   
1. In tensile bond test of soft liners, it was shown that both of Molloplast-B® specimens before and
after thermocycling had the highest tensile strength, and in case of hard liners, Dura-Liner
Ⅱ® specimen had the highest tensile strength before and after  thermocycling. Depending on
thermocycling, Soft-Relining®, Denture-Relining®, Molloplast-B®, Coe-Soft® and Kooliner® spec-
imen showed significant difference(p 〈0.05).
2. In strain test of soft liners, it was shown that Molloplast-B® specimen before thermocycling and
the Coe-Soft® after thermocycling showed highest results, and in case of hard liners, the Dura-
LinerⅡ® specimen before and after thermocycling had the highest result. Depending on ther-
mocycling, Denture-Relining®, Molloplast-B® and Dura-LinerⅡ® specimen showed significant
difference(p 〈0.05).
3. In maximum distance test of soft liners, the Molloplast-B® specimen before thermocycling and
the Coe-Soft® after  thermocycling showed highest results, and in case of hard liners, the Dura-
LinerⅡ® specimen  before  and  after  thermocycling  showed  highest  result. Depending  on
thermocycling, Denture-Relining®, Molloplast-B® specimens showed significant difference(p 〈0.05).
4. In elasticity test of soft liners, the Molloplast-B® specimen before and after thermocycling showed
highest result, and in case of hard liners, the Dura-LinerⅡ® specimen before thermocycling and
the  Tokuso-Rebase® after thermocycling showed highest results. Depending on thermocycling,
Soft-Relining®, Molloplast-B® specimens showed significant difference(p 〈0.05).

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