[논문]나노구조 알루미나 코팅 처리가 지르코니아 도재와 레진 시멘트 사이 전단 결합강도에 미치는 영향

김동운; 이정진; 김경아; 서재민

doi:10.4047/jkap.2016.54.4.354

나노구조 알루미나 코팅 처리가 지르코니아 도재와 레진 시멘트 사이 전단 결합강도에 미치는 영향
Influence of nano-structured alumina coating treatment on shear bond strength between zirconia ceramic and resin cement 원문보기

대한치과보철학회지 = The journal of Korean academy of prosthodontics, v.54 no.4, 2016년, pp.354 - 363

김동운 (전북대학교 치의학전문대학원 치과보철학교실 및 구강생체과학연구소) , 이정진 (전북대학교 치의학전문대학원 치과보철학교실 및 구강생체과학연구소) , 김경아 (을지대학교 의과대학 치과학교실) , 서재민 (전북대학교 치의학전문대학원 치과보철학교실 및 구강생체과학연구소)

초록
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목적: 본 연구는 지르코니아 도재 표면의 나노구조 알루미나 코팅이 지르코니아와 레진 시멘트와의 전단결합강도에 미치는 영향을 알아보고자 하였다. 재료 및 방법: 지르코니아 원판 80개를 표면처리방법(산화알루미늄 분사처리(A), 산화알루미늄 분사 후 Rocatec 처리(R), 연마 후 나노구조 알루미나 코팅(PC), 산화알루미늄 분사 후 나노구조 알루미나 코팅(AC))에 따라 4개의 군으로 나누었다. 알루미나 코팅은 질산 알루미늄을 가수분해시킨 용액에 침적 후 $900^{\circ}C$에서 열처리 하여 시행하였다. 지르코니아 표면 코팅은 주사전자 현미경을 이용하여 관찰하였다. 레진 블럭을 레진 시멘트를 이용하여 각 실험군의 지르코니아 표면에 합착하고 열순환처리 전, 후의 전단결합강도를 측정하였다. 결과: 알루미나 코팅을 한 지르코니아 표면은 균일하고 치밀한 나노구조 알루미나가 관찰되었다. PC, AC 군은 열순환처리 전과 후 모두 A와 R 군에 비해 현저하게 높은 전단결합 강도를 보였다. A, R 군은 열순환처리 후에 급격한 결합강도의 감소를 보였으나, PC와 AC군은 열순환처리에 의해 유의할만한 결합강도의 감소를 보이지 않았다. 결론: 지르코니아 표면에 나노구조 알루미나 코팅처리하는 것은 레진시멘트와의 결합강도를 증가시키는 방법이다.

Abstract ▼ AI-Helper

Purpose: The aim of this study was to investigate whether the application of nano-structured alumina coating to the surface of Y-TZP could enhance the bond strength with resin cement. Materials and methods: A total of 80 zirconia plates were prepared and divided into four groups. : 1) airborne particle abrasion treatment (A) : 2) Rocatec treatment after airborne particle abrasion (R) : 3) nano-structured alumina coating treatment after polishing (PC) and 4) nano-structured alumina coating after airborne particle abrasion (AC). Alumina coating was formed by the hydrolysis of aluminium nitride (AlN) powder and heat treatment at $900^{\circ}C$. Coating patterns were observed with FE-SEM. Resin block was bonded to treated zirconia ceramics using resin cement. The shear bond strengths were measured before and after thermocycling. Results: The FE-SEM images show a dense and uniform nano-structured alumina coating structure, which enhances shear bond strength by increasing micro mechanical interlocking to resin cement. PC and AC groups showed higher shear bond strengths than A and R groups before and after thermocycling. A and R groups displayed significant drops in shear bond strength after thermocycling. However, PC and AC groups did not show any meaningful decreases in shear bond strength after thermocycling. Conclusion: Treatment of Y-TZP ceramics with nano-structured alumina coating could significantly increase their shear bond strength.

주제어

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문제 정의

,⁴ it was reported that nano-sized inter-lamella spaces are open for resin penetration and are filled with resin matrix, forming an intermediate structure designated as the hybrid layer. The formation of the hybrid layer can improve the bond strength of resin cement, which has been shown by the results of this study.
The objective of this study is to analyze the bonding potential of Y-TZP ceramic with a nano-structured alumina coating to resin cement and compare the bond strength to those of ceramic surfaces with various surface treatments.
Therefore, the aim of this study is to suggest a new non-invasive process to increase zirconia-resin bonding. This is the application of nano-structured alumina coating on the surface of Y-TZP, which can increase the bonded surface area and achieve micro-mechanical interlocking by creating nano-retentions on the surface.

제안 방법

^29,31,32 In contrast, Kern and Wegner30 claimed that surface treatment of Y-TZP ceramics with airborne particle abrasion increased the bond strength with Bis-GMA resin cement, but the treatment was not stable for long term storage. In this study, A group treated with airborne particle abrasion showed the lowest bond strength and displayed significantly lower bond strength compared to PC and AC groups which were treated with nano-alumina coating (Table 3). This indicates that airborne particle abrasion can contribute to enhancing mechanical interlocking by roughening the Y-TZP ceramic surface but the process has a significantly lower bonding potential than nano-structured alumina coating treatment, which can create a large micro-retentive area.
To determine the influence of nano-structured alumina coating on the bond strength of a resin cement, this study measured the shear bond strength of Y-TZP ceramic substrates with resin cement after each of four different surface treatments. The groups with nanostructured alumina coating treatment displayed significantly higher shear strength than the groups with different treatments and had no statistically meaningful decline in shear bond strength.
To monitor the surface morphology of each group, two specimens from each group were analyzed using field-emission scanning electron microscopy (FE-SEM) (Supra 40VP, Carl Zeiss, Jena, Germany) before the shear bond strength test. Also, the fractured cross sections of 5 specimens from each group were filmed after the shear bond strength test to monitor failure modes.

대상 데이터

The AlN powder used for nano-structured alumina coating was AIN Grade C (H.C. Starck, Berlin, Germany) with a median particle size of 1.2 ㎛, a surface area of 6 m2 /g, and an oxygen content of 2.5 wt%O₂. A diluted aqueous suspension containing 3 wt% of AlN powder was prepared by dispersing 7.

데이터처리

, Chicago, IL, USA). In order to compare the shear bond strength between groups, the data were analyzed using analysis of variance (ANOVA). The Tukey HSD was performed for the post-hoc test (α=.
The mean and standard deviation values of the shear bond strength of the four different surface treatment groups were analyzed using one-way ANOVA (Table 3).
The paired t-test was carried out to assess the influence of thermocycling on the shear bond strength change of each group (α=.05).
Two-way ANOVA was performed to identify a possible interaction between thermocycling and surface treatment on the bond strength of resin cement (Table 2). The results showed no correlation between the two variables.

이론/모형

After conducting the shear bond strength test, failure modes were observed using FE-SEM (Fig. 6, Fig. 7, Fig. 8).

성능/효과

The studies conducted by Ernst35, Kern and Wegner³⁰ showed that tribochemical silica coating was ineffective in increasing bond strength. In this study, R group treated with tribochemical silica coating using Rocatec system showed higher bond strength than A group treated with airborne particle abrasion, but lower bond strength than PC and AC groups treated with nano alumina coating (Table 3). This indicates that chemical bonding due to silica-modified alumina particles and silane embedded in the Y-TZP ceramic surface can contribute to enhancing bond strength, though the increase was not significant.

후속연구

Further research on standardization options for nano-structured alumina coating on zirconia restoration and study of long term clinical trials are needed.

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저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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