Low-viscosity Resin System이 복합레진 수복물의 변연누출에 미치는 영향
THE EFFECT OF LOW-VISCOSITY RESIN SYSTEMS OM MARGINAL LEAKAGE OF COMPOSITE RESIN RESTORATIONS
소속 상세정보
양정숙/Jeong Suk Yang
김문현/허선/김재곤/백병주/Mun Hyoun Kim/Sun Her/Jae Gon Kim/Byeong Ju Baik
KMID : 0358919970240020460
Abstract
결론
복합레진 수복 후 변연부 미세누출을 감소시키기 위하여 사용되는 다양한 Low-viscosity
resin system의 봉쇄효과를 비교, 평가하고자 70개의 건전한 소구치에 1급와동을 형성하고
복합레진으로 충전한 후 연마하여 변연부를 노출시키고, 각 시편을 무작위로 추출하여 사용
된 rebonding agent의 종류 및 처리방법에 따라 다음의 7개 군으로 분류하였다.
1군은 대조군으로써 아무런 처치를 하지 않았고, 2군은 Scotchbond Multipurpose(3M Co.)
의 도포 후 연마, 3군은 Fortify(Bisco Co.)의 도포 후 연마, 4군 및 5군은 Concise white
sealant(3M Co.)의 도포 후 연마를 시행한 경우와 시행하지 않은 경우이며, 6군 및 7군도 P
& F sealant (Bisco Co.)로 도포하고 연마여부에 따라 분류하였다.
이 후 thermocycling과 색소침투법을 시행하고, 입체광학현미경과 주사전자현미경으로 관
찰한 결과, 다음과 같은 결론을 얻었다.
1. 색소침투지수 비교시 대조군에 비해 Scotchbond Multipurpose와 Fortify로 처리한 2군
과 3군에서 통계학적으로 유의하게 낮은 색소 침투지수를 보였으며(P<0.05), white sealant
로 처리한 4군과 6군은 통계학적으로 유의한 차이가 없었다(P>0.05).
2. white sealant 도포 후 연마여부에 따른 색소침투지수를 비교시 연마를 시행한 4군과 6
군은 연마를 시행하지 않은 5군과 7군에 비해 높게 나타남으로서(P<0.05), 연마 여부에 따
른 차이가 관찰되었다.
3. Rebonding agent의 침투정도를 주사전자현미경으로 관찰한 결과, Scotchbond
Multipurpose와 Fortify는 변연공극내 30-40㎛ 정도까지 침투하였으나, white sealant는 변
연공극내로 침투하지 못하고 단순히 변연부 표면에만 결합되어있는 양상을 나타냈다.
#초록#
The purpose of this study was to evaluate and compare the effectiveness of various
low-viscosity resin systems used as rebonding agents to prevent microleakage at the
margins of class I composite resin restorations.
Seventy sound human premolars were selected for experiment. Class I cavities were
prepared and each cavity was conditioned with a 37% phosphoric acid for 15 sec, rinsed
with water for 15 sec, and dried with compressed air. Bonding agent(Scotchbond
Multipurpose, 3M Co.) was applied and a hybrid composite resin(Z-100, 3M Co.) was
placed using an incremental technic. The excess cured composite resin was carefully
removed with SofLex discs(3M Co.) to expose the original margins of the cavity.
The following seven groups were established : group 1 was not rebonded and used as
control group ; group 2 was rebonded with a Scotchbond Multipurpose(3M Co.) and
finished ; group 3 was rebonded with a Fortify(BISCO) and finished ; group 4 was
rebonded with a Concise white sealant(3M Co.) and finished ; group 5 was rebonded
with a Concise white sealant(3M Co.) and not finished ; group 6 was rebonded with a P
＆ F sealant(BISCO) and finished ; group 7 was rebonded with a P ＆ F
sealant(BISCO) and not finished.
The specimens were then subjected to 500 thermocycles between 5 ＆ 65 with a 10 sec
dwell time and immersed in 2% methylene blue dye solution for 24 hours and sectioned
with low-speed diamond cutter into two part under water condition. The extent of
microleakage at rebonded margins was evaluated microscopically and scored for dye
penetration according to the following scale : 0=no dye penetration ; 1=dye penetration
to half-way along axial wall between enamel surface and DEJ ; 2=dye penetration
beyond halfway along axial wall between enamel surface and DEJ ; 3=dye penetration to
the full depth of DEJ or beyond DEJ. Selected samples were prepared for SEM
observation to determine the depth of penetration of the rebonding agent into the
marginal interface.
The obtained results were as follows :
1. In the group 2 and 3, which is rebonded with a Scotchbond Multipurpose and
Fortify, dye penetration score were decreased significantly than that of group 1(P<0.05),
but group 4 and 6 were not statistically different from group 1(P<0.05).
2. There were significant differences between group 4, 6 and group 5, 7 when
compared by dye penetration score(P<0.05).
3. In the SEM observation, Scotchbond Multipurpose and Fortify were penetrated
within 30-40㎛ depth of the outermost surface. However, both sealants were failed to
penetrate into the debonded interface.
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