불산 처리 시간이 강화형 전부도재관과 레진 시멘트의 전단 결합강도에 미치는 영향

김경일; 최근배; 안승근; 박찬운

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불산 처리 시간이 강화형 전부도재관과 레진 시멘트의 전단 결합강도에 미치는 영향
EFFECT OF ETCHING TIME ON SHEAR BOND STRENGTH OF RESIN CEMENTS TO REINFORCED ALL-CERAMIC CROWNS

대한치과보철학회지 2004년 42권 5호 p.501 ~ 513

김경일, 최근배, 안승근, 박찬운,

소속 상세정보

김경일 ( Kim Kyoung-Il ) - 전북대학교 치과대학 보철학교실
최근배 ( Choi Keun-Bae ) - 전북대학교 치과대학 보철학교실
안승근 ( Ahn Seung-Geun ) - 전북대학교 치과대학 보철학교실
박찬운 ( Park Charn-Woon ) - 전북대학교 치과대학 보철학교실

KMID : 0362420040420050501

Abstract

Purpose : The purpose of this study was to evaluate the effects of etching time on shear bond strength of four resin cements to IPS Empress 2 ceramic.

Material and Methods: Forty rectangular shape ceramic specimens (10×15×3.5mm size) were used for this study. The ceramic specimens divided into four groups and were etched with 10% hydrofluoric acid for 0, 10, 30, 60, 180, 300, 420, 600, and 900 seconds respectively. Etched surfaces of ceramic specimens were coated with ceramic adhesive system and bonded with four resin cement (Variolink II, Panavia F, Panavia 21, Super-Bond C&B) using acrylic glass tube. All cemented specimens were tested under shear loading untill fracture on universal testing machine at a crosshead speed 1mm/min: the maximum load at fracture (kg) was recored. Shear bond strengh data were analyzed with oneway analysis of variance and Tukey HSD tests (p<.05). Etched ceramic surfaces (0-, 60-, 300-, and 600-seconds etching period) and fracture surfaces after shear testing were examined mophologically using scanning electron microscopy.

Results : Ceramic surface treatment with 10% hydrofluoric acid improved the bond strength of three resin cement except for Super-Bond C&B cement. Variolink II (41.0±2.4 MPa) resin cement at 300-seconds etching time showed statistically higher shear bond strength than the other resin cements (Panavia F: 28.3±2.3 MPa, Panavia 21: 21.5±2.2 MPa, Super-Bond C&B: 16.7±1.6 MPa). Ceramic surface etched with 10% hydrofluoric acid for 300 seconds showed more retentive surface texture.

Conclusion: Within the limitation of this study, Variolink II resin cement are suitable for cementation of Empress 2 all-ceramic restorations and etching with 10% hydrofluoric acid for 180 to 300 seconds is required to enhance the bond strength.