상아질 접착제의 적용이 법랑질 접착에 미치는 영향

권태엽,권용훈,김교한,송근배 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.2

The objective of this study was to evaluate the effect of various enamel surface treatments on the bond strength of a composite resin to enamel (n=15). Ground bovine enamel specimens were divided into seven groups. A composite resin (Z250. 3M) was bonded to the specimens using different enamel surface treatments. Four groups examined the effect of application of all-in-one adhesives (Prompt L-Pop (POP), One-Up Bond F (ONE)) with respect to static priming (SP) or dynamic priming (DP). The other two examined use of the POP and ONE after phosphoric acid etching (PE). And the control group provided bond strength of the composite resin to phosphoric acid etched enamel with a resin bonding system (Single bond, SB, 3M). Shear bond strengths for the specimens were measured after 24 hours storage in water at 37 ℃. Effects of various surface treatments on enamel were examined by SEM. Dynamic priming resulted in higher enamel bond strengths than static priming and the best bond strengths were obtained when the enamel was etched with phosphoric acid. SEM analysis showed that depth of etching was related to the bond strengths measured. The enamel etch pattern after static priming showed little retentive surfaces. After dynamic priming, the enamel rod structure has become apparent in the shallow etch. SEM view showed that the resin tags and resin penetration were related to the bond strengths measured. SEM showed minimal resin penetration into enamel following static priming. After application of adhesives to phosphoric acid etched enamel, SEM showed more extended tags that are reflective of the deeper etch pattern.

금합금의 프라이머 처리가 교정용 브라켓의 접착에 미치는 영향

류동범,권태엽,권용훈,김교한 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.3

The purpose of this study was to compare the bonding strength and the interfacial micromorphology of two surface modification of gold alloys in direct bonding of orthodontic brackets. Flat tab of cast gold alloys (n= 120) were subjected to either of two surface treatments: 1.50㎛ aluminum oxide sandblasting, and 2. sandblasting plus adhesive primer for noble metal. Orthodontic brackets (RMO Co.) were bonded directly with Superbond C&B (Sun Medical Co. Ltd.), or Transbond XT (3M Unitek), or Ortho One (Bisco). All specimens were stored in distilled water at 37℃ for 24 hours, and then the tensile bond strength testing was performed in a Instron test machine. Bond failure sites were classified by a modified Adhesive Remnant Index (ARI) system. The results showed that sandblasting plus adhesive primer for noble metal produced stronger bonds to gold alloy than sandblasting only in all cases (Superbond C&B, Transbond XT, Ortho One). Superbond provided significantly stronger bonds to gold alloy than the others. Bond failure of Superbond to sandblast only and sandblast plus adhesive primer for noble metal to gold alloy occurred at the bracket/adhesives interface, whereas bond failure of the others occurred at the gold/adhesive interface. The clinical implications of these findings are discussed.

임플란트 보철물에서 임시 접착용 시멘트의 인장결합강도 비교

서경숙,권태엽,권용훈,김교한 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.4

The major disadvantage of cement-retained implant-supported superstructure is difficulty of retrievability. Sometimes, it is recommended that proetheses be provisionally cemented to implant abutment in order to ebaluate occlusion, screw loosening and tissue reaction. The retention of the provisional luting cementedusually employed in this case is considered to be important. This study compared tensile bond strength of gold crowns cemented to machined titanium implant abutments with three provisional luting cements. Also the effect of petrolatum and thermocycling on tensile bond stength were evaluated. Tensile bond strength of provisional luting cement were as follows with the decreasing order of Eugenol (13.06±1.544 kgf), Temp-Bond (9.41±0.737 kgf), Cavex (8.04±0.974 kgf), and Temp-bond with petrolatum (5.28±0.800 kgf). The addition of petrolatum in Temp-bond decreased tensile bond strength significantly (p<0.01). After thermocycling of 1,500 cycles, the tensile bond strengths of the cements were decreased with the order of Nogenol (10.87±3.031 kgf), Temp-Bond (8.1±0.667 kgf), Cavex (7.33±1.103 kgf), Temp-bond with petrolatum (4.88±1.348 kgf). The mocycling decreased the bond strength of Temp-Bond significantly, with no effects no other cements (p<0.01).

Vital Bleaching이 법랑질 접착에 미치는 영향

김종해,권태엽,권용훈,김교한 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.4

The objective of this in vitro study was to evaluate the effect of bleaching on the composite to enamel bond and surface hardness change. Extracted human premolars were treated with 35% hydrogen peroxide (Sigma Chemical Co, USA) for 1hr/day at 0, 3, 6 and 9 day respectively. For the obsrvation of surface mophology alteration due to the treatment with hydogen peroxide, a SEM (S-4300, Hitachi, Japan) was used. The specimens were ground flat using serial SiC papers and ground ultra-finely using a 0.1㎛ diamond compound paste. To measure the microhardness, five non-carious premolars were ground using SiC papers and ten indentations were made on the surfacd with Vickers hardness tester (FM-7 FUTURE-TEC Inc., Japan). To evaluate shear bond strength, composite was bonded with One Up Bond-F, Prompt L-Pop, AQ Bond to the non-bleached and bleached enamel surface of sixty non-carious premolars. The bonding procedure is postponed for 1 week after bleaching and shear bond strength was measured. All specimens with a SEM. Bleaching created some enamel porosity but the teeth showed nonsignificant morphological chonge as bleaching time increased from SEM analysis. Most microhardness change occured on the first day of bleaching. Bleaching with 35% hydrogen peroxide did not result in significant change in the shear bond strength of composite resin to enamel. In the shear bond strength test, the fractured surfaces of specimens showed mixed adhesive and cohesive failure behavior.

양극산화와 절연파괴로 형성한 인산칼슘 함유 티타늄 산화피막의 특성

최원호,이용승,김동환,권용훈,배태성 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.1

This study was performed to investigate the surface properties of electrochemically oxidized pure titanium by anodic spark deposition technique. Titanium plates of 10×10×1 ㎜ were polished sequentially from # 300 to # 1,000 emery paper. They were ultrasonically washed in ethyl alcohol and acetone for 5 min and dried in a desiccator. Titanium plates and titanium screw implants were anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 190-340 V and the current density was 30 ㎃/㎠. The surface oxide film was characterized by X-ray deffractometer(XRD), scanning electron microscope(SEM) and X-ray photoemission spectroscopy(XPS). The main crystal structure of the titanium oxide was anatase type as analyzed with thin-film X-ray diffractometery. The diameter of micropores increased with increasing the spark forming voltage. The porous coatings showed the growth of cell structure and more compact texture with increasing the spark forming voltage. Microcracks were examined in the coating formed at voltage of 340 V. Ca/P ratio in coatings was increased with increasing the voltage.