Quantitative analysis of ceramic bracket base surfaces by 3D imaging system
3차원 영상 기술을 이용한 세라믹 브라켓 베이스의 정량적 표면 분석
Dept. of Dental Science/석사
Bracket base morphology can influence the bond strength of brackets by determining thegeometry of the cement tags and stress distribution within the cement bracket interface.However, there are a few studies about bracket base itself, and only by two-dimensionalanalysis. The purpose of this study was to investigate the three dimensional structural featuresof various ceramic bracket bases by comparing and quantitatively analyzing differences in surface features of each ceramic bracket base using scanning electron microscope, opticalinterferometry, and microcomputed tomography.One of metal [MicroArch (Tomy, Tokyo, Japan)] and four types of ceramic maxillary rightcentral incisor brackets [Crystaline MB (Tomy, Tokyo, Japan), INVU (TP Orthodontics,LaPorte, IN, USA), Fascination (Dentaurum, Ispringen, Germany), and Inspire ice (Ormco,Glendora, CA, USA)] were tested in this study. The bracket bases were examined with ascanning electron microscope to assess surface topography, and each bracket showed uniquesurface texture (MicroArch, Double mesh; Crystaline MB, Irregular; INVU, Single mesh;Fascination, Smooth; Inspire ice, Bead ball).With a three-dimensional optical surface profiler, characteristic three dimensional basesurface features and roughness of each bracket can be obtained. MicroArch metal bracketshowed the highest roughness among all brackets tested in this study. Crystaline MB showedthe highest roughness among the ceramic brackets, INVU was the next, and Fascinationshowed the lowest roughness.Whole and unit bracket base surface areas were evaluated with a Microcomputedtomography. MicroArch metal bracket showed the largest whole (50.04 ± 1.07 mm2) and unit (20.48 ± 0.86 mm2) bracket base surface area. INVU showed the largest whole bracket basesurface area (45.46 ± 0.87 mm2) among the ceramic brackets, Inspire ice (35.02 ± 0.75 mm2)was the next, and then Cystaline MB (33.73 ± 0.60 mm2). Fascination (27.81 ± 0.56 mm2)showed the smallest whole bracket base surface area. Inspire ice showed the largest unitbracket base surface area(15.28 ± 0.72 mm2) among the ceramic brackets, INVU (14.64 ±0.50 mm2) was the next, and then Cystaline MB (14.48 ± 0.35 mm2). Fascination (14.14 ±0.22 mm2) showed the smallest unit bracket base surface area.In this study, we evaluated bracket base surface structures by quantitatively and threedimensionally. With the further studies of bond strength change according to threedimensional surface structure alterations, brackets that give optimal bonding can be produced.