가상 생리적 압력하에서 Porcelain laminate veneer 접착시 상아질 접착제의 변연 누출에 관한 연구

Abstract

[한글]

백아범랑질 경계 하방까지 변연이 확장된 porcelain laminate veneer를 가상 생리적 압력이 가해진 상태의 치아에 도말층 처리법이 다른 수종의 상아질 결합제의 변연 누출을 측정하기 위하여 발거한 치아 60개를 각각 15개씩 4군으로 나누어, 변연을 법랑질상에 둔

군을 대조군, 상아질에 변연을 둔 군들 중에서 All Bond 2를 사용한 군을 실험 1군, Scotchbond MP를 사용한 군을 실험 2군,Gluma를 사용한 군을 실험 3군으로 분류하였다. 각 시편의 치근을 절단하고 pocelain laminate veneer를 위한 치질의 삭제를 시행하고 치수

강내의 치수를 제거한 후 생리식염수를 이용해 가상 생리적압력을 가한 후 각각의 상아질 접착제를 이용해 치아에 pocelain laminate veneer를 접착하였다. 이들을 섭씨 37도의 항온조에 24시간 담근 후 1500회의 thermocyding을 하였으며, 그 후 0.5% basic fuchsin

용액으로 염색한 후 그 변연 누출 정도를 광학 현미경하에서 비교 관찰한 결과 다음과 같은 결론을 얻었다.

1. 법랑질상에 변연을 둔 대조군의 경우, 일부 시편에서만 변연누출을 보였고, 상아질에 변연을 둔 실험군들에서는 모든 시편에서 변연누출을 보였다.

2. 통계학적으로 법랑질상에 변연을 둔 대조군이 실험군들에 비해 가장 적은 변연누출을 보였고(p<0.05), All Bond 2를 사용한 실험 1군과 Scotchbond MP를 사용한 실험 2군은 유의차가 없었으며(p>0.05), Gluma를 사용한 실험 3군은 대조군과 다른 실험군보다 큰 변연누출을 보였다(p<0.05).

MICROLEAKAGE OF DENTIN BONDING AGENTS IN PORCELAIN LAMINATE VENEER UNDER SIMULATED

PHYSI0LOGIC PRESSURE

Young-Jin Choi, D.D.S.

Department of Dental Science, Graduate School, Yonsei Universty

(Directed by Prof. Ho-Young Lee, D.D.S., M.S.D., Ph.D)

The purpose of this study was to evlauate the microleakage of 3 dentin bonding

agents using different dentin pretreatment method under simulated physilogic

pressure in cementing the porcelain laminate veneer. Noncarious 60 human maxillary

molars were selected and randomly assigned to 4 groups of 15 each. The group with

the margin placed on the enamel was classified as the control and the groups with

the margin placed on root surface were subdivided into 3 groups according to the

dentin bonding agents used. The group using All Bond 2 was classified as

experimental group1, the group using Scotchbond MP was classified as experimental

group 2, and the group using Gluma was classified as experimental group 3.

Roots were removed at 3mm below the cementoenamel junction, and reductions of the

teeth for the porcelain laminate veneer were done on the mesial 1/2 of the buccal

surface of each teeth. The pulp was extirpated and the pulp chamber was cleaned

with 37% phosphoric acid for the patency of dentinal tubule. Under simulated

physiologic pressure, porcelain laminate veneers were cemented t0 the teeth using

each dentin bonding agent and luting cement. After cementation, all samples were

stored at 36℃ in water for 24 hours and thermocycled for 1500 cycles, then

immersed in 0.5% basic fuchsin solution and the teeth were sectioned longitudinally

by using diamond saw and the extent of microleakage was measured.

The following results were obtained,

1. Microleakage was observed in a few samples of control group but all the

samples of experimental groups.

2. The control group showed the less extent of microleakage than the experimental

groups. In experimental groups the experimental group 1 & the experimental group 2

showed similiar extent of microleakage and the experimental group 3 showed the

greater extent of microleakage than other groups.

Conclusively, practicing the porcelain laminate veneers in the clinic although

the margin of the porcelain laminate veneer should be placed on enamel, in the case

that it is inevitable to place the margin of the porcelain laminate veneer on the

root surface, it is recommened to use dentin bonding agents which use no dentin

pretreatment or a dentin pretreatment which can leave the smear plugs.

[영문]

The purpose of this study was to evlauate the microleakage of 3 dentin bonding agents using different dentin pretreatment method under simulated physilogic pressure in cementing the porcelain laminate veneer. Noncarious 60 human maxillary molars were selected and randomly assigned to 4 groups of 15 each. The group with the margin placed on the enamel was classified as the control and the groups with the margin placed on root surface were subdivided into 3 groups according to the dentin bonding agents used. The group using All Bond 2 was classified as

experimental group1, the group using Scotchbond MP was classified as experimental group 2, and the group using Gluma was classified as experimental group 3.

Roots were removed at 3mm below the cementoenamel junction, and reductions of the teeth for the porcelain laminate veneer were done on the mesial 1/2 of the buccal surface of each teeth. The pulp was extirpated and the pulp chamber was cleaned with 37% phosphoric acid for the patency of dentinal tubule. Under simulated physiologic pressure, porcelain laminate veneers were cemented t0 the teeth using each dentin bonding agent and luting cement. After cementation, all samples were stored at 36℃ in water for 24 hours and thermocycled for 1500 cycles, then

immersed in 0.5% basic fuchsin solution and the teeth were sectioned longitudinally by using diamond saw and the extent of microleakage was measured.

The following results were obtained,

1. Microleakage was observed in a few samples of control group but all the samples of experimental groups.

2. The control group showed the less extent of microleakage than the experimental groups. In experimental groups the experimental group 1 & the experimental group 2 showed similiar extent of microleakage and the experimental group 3 showed the

greater extent of microleakage than other groups.

Conclusively, practicing the porcelain laminate veneers in the clinic although the margin of the porcelain laminate veneer should be placed on enamel, in the case that it is inevitable to place the margin of the porcelain laminate veneer on the

root surface, it is recommened to use dentin bonding agents which use no dentin pretreatment or a dentin pretreatment which can leave the smear plugs.