HOME > Abstract
THE EFFECTS OF THERMOCYCLING ON THE BOND STRENGTH BETWEEN COBALT-CHROMIUM ALLOY AND DENTURE BASE RESIN Thermocycling이 Cobalt-Chromium 합금과 의치상 레진의 결합강도에 미치는 영향
Su-Yeon Lee, Mong-Sook Vang
이수연, 방몽숙

The purpose of this study was to evaluate the effects of thermocycling on the shear bond strength
of Co-Cr alloy to denture base resin. PMMA denture base resin such as heat-cured Vertex-RS®,
self-cured Vertex-SC® and 4-META denture base resin such as heat-cured Meta-Dent®, self-cured
Meta-Fast® was bonded to Co-Cr alloy.
Samples were  divided  into  3  groups  :  no  thermocycling  group  as  control,  thermocycling
between 5℃ and 55℃ with 15 second dwell time as group 1, thermocycling with 1 minute dwell
time as group 2.
The shear bond strength was measured and the interface between metal and resin was observed
by SEM.
The results were as follows.
1. The  shear  bond  strength  decreased  significantly  according  to  thermocycling  and  dwell
time(P<0.001).
2. The bond strength of Co-Cr alloy and 4-META denture base resin was significantly higher than
that of Co-Cr alloy and PMMA denture base resin(P<0.001).
3. In SEM, there was no gap in control group, but there was much and large gap in group 1, 2.
The longer dwell times, the lower bond strength. PMMA denture base resin had more gap than
4-META denture base resin in the interface.
These results revealed that thermocycling decreased the bond strength between Co-Cr alloy and
denture base resin and dwell time of thermocycling changed the effect of thermocycling. The results
suggested that oral temperature change affect the bond strength of prosthesis.

* Keywords:

* 주요단어: