Comparative study of the shear bond strength of various veneering materials on commercially pure titanium

Abstract

목적: 절삭형 티타늄 구조물을 이용한 보철물 제작에 많이 사용되는 열중합 의치상 레진, 도재, 간접 복합 레진의 순수 티타늄과의 결합 강도를 비교 평가하였다. 방법: 지름 9 mm, 높이 10 mm의 Grade II 순수 티타늄 (Grade Ⅱ commercially pure titanium; CP-Ti, Dynamet, Santa Fe Springs, CA, USA) 원통형 시편 30 개를 3 군으로 나누어 각각 직경 7 mm, 두께 2 mm의 열중합 의치상 레진 (Lucitone 199, Dentsply Trubyte, York, PA, USA), 간접 복합 레진 (Sinfony, 3M ESPE, Seefeld, Germany), 도재 (Triceram, Dentaurum, Ispringen, Germany)를 결합시켰다. 대조군으로 Type Ⅳ gold alloy를 직경 9 mm로 주조하여 열중합 의치상 레진 (Lucitone 199)과 결합시켰다. 시편은 5-55 ℃에서 5000회 열 순환 처리 후, 만능 시험기 (Instron 4465, Canton, Mass, USA)를 이용하여 1 mm/min의 속도로 하중을 가하여 결합강도를 측정하였다. 측정값은 Kruskal-Wallis Test와 Mann-Whitney Test (SPSS 15.0, SPSS Inc., Chicago, IL, USA)로 통계 처리하였으며, 유의수준은 P < .05로 하였다. 파절면은 광학현미경관찰 및 SEM 관찰하였다. 결과: 티타늄 군에 대한 실험결과에서는 Ti-Lucitone 199 (12.11 ± 4.44 MPa) 의 결합 강도가 가장 높았으며, Ti-Triceram (11.09 ± 1.66 MPa), Ti-Sinfony (4.32 ± 0.64 MPa) 순으로 감소하였다. 주조 금합금에 Lucitone 199을 결합시킨 대조군 (16.14 ± 1.89 MPa)에 비하면 낮은 수치이나 대조군과 Ti-Lucitone 199군, Ti-Lucitone 199 군과 Ti-Triceram 군의 차이는 통계학적으로 유의하지 않았다. 파절면의 관찰결과 실험군의 대부분은 부착성 파절 양상을 보였다. 결론: 절삭형 티타늄과 의치상용 레진, 티타늄 전용 도재의 결합은 임상적으로 허용 가능한 결합강도를 갖는다.;Purpose: The objective of this study is to evaluate the shear bond strength of three different veneering materials to commercially pure titanium (CP-Ti). Materials and Methods: The total number of specimens for the experimental and control groups were 40. Thirty specimens of CP-Ti disc with 9 mm diameter and 10 mm height were divided into three experimental groups. Each group was bonded to heat-polymerized acrylic resin (Lucitone 199), porcelain (Triceram), and indirect composite (Sinfony) with 7 mm diameter and 2 mm height according to the manufacturers’ recommendations. For the control group (n = 10), type Ⅳ gold alloy castings with 9 mm diameter and 10 mm height were used and heat-polymerized acrylic resins (Lucitone 199) were applied on those castings. All samples were thermocycled for 5000 cycles in 5 - 55 ˚C water. The maximum shear bond strength (MPa) was measured with a Universal Testing Machine (Instron 4465, Canton, Mass, USA) with cross head speed of 1 mm/min. After the shear bond strength test, the failure mode of the veneering material on metal was assessed with a scanning electron microscope (SEM). Statistical analysis of the results was carried out with a Kruskal-Wallis Test and Mann-Whitney Test at a significance level of 0.05. Results: The mean shear bond strength and standard deviations for experimental groups were as follows: Ti-Lucitone 199 (12.11 ± 4.44 MPa); Ti-Triceram (11.09 ± 1.66 MPa); Ti-Sinfony (4.32 ± 0.64 MPa). All of these experimental groups showed lower shear bond strength than the control group (16.14 ± 1.89 MPa). However, there was no statistically significant difference between the Ti-Lucitone 199 group and the control group, and the Ti-Lucitone 199 group and the Ti-Triceram group. Most of the failure patterns in all experimental groups were adhesive failures. Conclusions: The combinations of the casted gold alloy with Lucitone 199, titanium with Lucitone 199, and titanium with Triceram have shown the clinically acceptable shear bond strength.