안면신경 마비 환자에 있어서의 측두근 및 근막피판을 이용한 안면근 기능 회복 증례보고

정창주,권혁도,엄인웅,우승철,민승기,정호용 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1

Generally, the totally paralyzed face can never be made normal by any of the current methods of reconstruction. Careful selection of patients based on sound judgment of what can and cannot be achieved by the proposed surgical technique is paramount to a successful operation and a satisfied patient. The results are related to time of delayed between injury and repair : the shorter the delay the better are the results. The objectives in correcting facial paralysis are to achieve normal appearance at rest ; symmetry with voluntary motion ; control of the ocular, oral, and nasal sphincter; symmetry with involuntary emotion and controlled balance when expressing when expressing emotion ; and no significant functional deficit secondary to the reconstructive surgery. It must be employed a number of concepts, for treatment of the paralyzed face by surgeon, depending on the cause, time interval, and wound characteristics, as well as the availability of and necessity for neuromuscular substitution. Nerve grafts, crossovers, muscle transfers, free muscle and nerve-muscle grafts, micronuerovascular muscle transfers, and regional muscle transpostion are the principal methods being developed. We applied the tmporal musle transposition for reanimation of unilatrally paralyzed faces for long times on two patients. The results of muscle transposition can be enhanced by the patient's learning to activate the transposed muscle by voluntary effort, and are best in patients who are motivated to learn the necessary motor-sensory coordination techniques.

단량체 및 무기질 filler 조성 변화에 따른 복합레진의 유변학적 특성

이인복,이종혁,조병훈,손호현,이상탁,엄정문 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.6

Objectives. The aim of this study was to investigate the effect of monomer and filler compositions on the rheological properties related to the handling characteristics of resin composites. Methods. Resin matrices that Bis-GMA as base monomer was blended with TEGDMA as diluent at various ratio were mixed with the Barium glass (0.7 um and 1.0 um), 0.04 um fumed silica and 0.5 um round silica. All used fillers were silane treated. In order to vary the viscosity of experimental composites, the type and content of incorporated fillers were changed. Using a rheometer, a steady shear test and a dynamic oscillatory shear test were used to evaluate the viscosity (η) of resin matrix, and the storage shear modulus (G′), the loss shear modulus (G″), the loss tangent (tanδ) and the complex viscosity (η*) of the composites as a function of frequency ω= 0.1-100 rad/s. To investigate the effect of temperature on the viscosity of composites, a temperature sweep test was also undertaken. Results. Resin matrices were Newtonian fluid regardless of diluent concentration and all experimental composites exhibited pseudoplastic behavior with increasing shear rate. The viscosity of composites was exponentially increased with increasing filler volume%. In the same filler volume, the smaller the fillers were used, the higher the viscosities were. The effect of filler size on the viscosity was increased with increasing filler content. Increasing filler content reduced tanδby increasing the G′further than the G″. The viscosity of composites was decreased exponentially with increasing temperature.

점도, 시편형태 그리고 접착의 유무가 광중합 복합레진의 선형중합수축의 측정에 미치는 영향

이인복,손호현,권혁춘,엄정문,조병훈 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.6

Objectives. The aim of study was to investigate the effect of flow, specimen geometry and adhesion on the measurement of linear polymerization shrinkage of light cured composite resins using linear shrinkage measuring device. Methods. Four commercially available composites an anterior posterior hybrid composite Z100, a posterior packable composite P60 and two flowable composites, Filtek flow and Tetric flow were studied. The linear polymerization shrinkage of composites was determined using 'bonded disc method' and 'non bond ed' free shrinkage method at varying C factor in the range of 1~8 by changing specimen geometry. These measured linear shrinkage values were compared with free volumetric shrinkage values. The viscosity and flow of composites were determined and compared by measuring the dropping speed of metal rod under constant load. Results. In non bonded method, the linear shrinkage approximated one third of true volumetric shrink age by isotropic contraction. However, in bonded disc method, as the bonded surface increased the linear shrinkage increased up to volumetric shrinkage value by anisotropic contraction. The linear shrinkage value increased with increasing C factor and approximated true volumetric shrinkage and reached plateau at about C factor 5~6. The more flow the composite was, reduced linear shrinkage was measured by compensation radial flow.

복합레진 수복시 와동의 크기 및 수복 방법이 교두 굴곡에 미치는 영향

이미라,이인복,석창인,이상탁,엄정문 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.6

The aim of this study was to measure the cusp deflection during composite restoration for MOD cavity in premolar and to examine the influence of cavity dimension, C-factor and restoration method on the cusp deflection. Thirty extracted maxillary premolar were prepared to four different sizes of MOD cavity and divided into six groups. The width and depth of the cavity were as follows. Group 1; 1.5 × 1 ㎜, Group 2; 1.5 × 2 ㎜, Group 3; 3 × 1 ㎜, and Group 4-6; 3 × 2 ㎜ respectively. Group 1-4 were restored using bulk filling method with Z-250 composite. However, Group 5 was restored incrementally, and Group 6 was restored with an indirect resin inlay. The cusp deflection was recorded at the buccal and lingual cusp tips using LVDT probe for 10,000 seconds. The measured cusp deflections were compared between groups, and the relationship between the cube of the length of cavity wall/the cube of the thickness of cavity wall (L³ / T³), C-factor and cusp deflection or %flexure (100 × cuspal deflection / cavity width) was analyzed. The cusp deflection of Group 1-4 were 12.1 ㎛, 17.2 ㎛, 16.2 ㎛ and 26.4 ㎛ respectively. The C-factor was related to the %flexure rather than the cusp deflection. There was a strong positive correlationship between the L³ / T³ and the cusp deflection. The cusp deflection of Group 5 and 6 were 17.4 ㎛ and 17.9 ㎛ respectively, which are much lower value than that of Group 4.

자연치와 복합레진의 색 분포에 관한 연구

김희선,이인복,엄정문 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.2

The structure of current guides is largely illogical and without any rational use of color ordering. The shade guides are generally made of plastic (rather than the actual composite material) and do not accurately depict the true shade, translucency, or opacity of the composite resin after polymerization. To solve this problem, information based on evaluations of natural teeth and material that use the same method and experimental conditions is necessary. The present investigation measured the color of natural maxillary anterior teeth in vivo and compared the results with those of composite resins. 269 Korean subjects were selected for this study. Intact central incisor, lateral incisor, and canine were selected. The clinical crowns were free of caries or restorations. The middle site of the coronal portion on the labial surface of the tooth was measured by Chroma Meter. The five light activated, resin-based materials(Amelogen, Denfil, Elitefil, Spectrum, Z100) were used in this study. Resin composite was condensed into plastic mold with a diameter of 8mm and a thickness of 4mm, pressed between glass plates to flatten the surfaces, and polymerized using a Visilux II visible light-activation unit, The surfaces were polished sequentially on wet sandpaper. Color measurements of each specimen were accomplished by Chroms Meter. A compute program that compares each tooth color with each composite resin color was written and the minimum CIELAB color difference(ΔE*) between tooth and each material was calculated. Under the conditions of this study: 1.Teeth tend to become darker with advancing age. 2.Canines were darker, more yellow, and less green than incisors. 3.The teeth from the women were lighter, more green, and less yellow than the male teeth. 4.In general, composite resins were lighter, more green, and less yellow than teeth. Deficiencies were noted in Hues in YR range. 5.Mean color differences between the five composite resin products and teeth were detectable to the naked eye(ΔE*>1.0). 6.In comparing the mean ΔE* values of materials, Spectrum showed the least followed by Z100, Elitefil, Amelogen, Denfil in increasing order.

Shear bond strength of dentin bonding agents cured with a plasma arc curing light

Kwon, Youngchul,Kim, Sun-Young,Chung, Sae-Joon,Han, Young-Chul,Lee, In-Bog,Son, Ho-Hyun,Um, Chung-Moon,Cho, Byeong-Hoon 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.3

광물리학적 특성 분석을 위해 Apollo 95E (DMT Systems, Orange, CA; PAC 광중합기), Elipar Freelight 2 (3M ESPE, MN, USA; LED 광중합기) 그리고 VIP Junior (Bisco, Schaumberg, IL, USA; QTH 광중합기), 3종의 광중합기의 총광강도(Total intensity)와 spectral distribution을 측정하였고 특정 파장에 해당되는 광강도 (Energy density)를 분석하였다. 상아질 전단접착강도의 측정을 위해 Scotchbond Multipurpose (3M ESPE), Single bond (3M ESPE) 그리고 Clearfll SE bond (Kuraray)가 사용되었다. Plasma Arc Curing light (Apollo 95E) 팡중합기는 여러개의 최대정점을 가지며 넓은 spectral distribution과 2307 mW/cm²의 높은 광강도를 나타내었고, VIP Junior 광중합기는 490 ㎜에서 최대정점을 갖는 넓은 spectral distribution을 나타내었고, Elipar Freeelight 2 광중합기는 462 ㎜의 최대정점 주위로 좁은 spectral distribution를 보였다. Two-Way ANOVA와 Bonferroni' s multiple comparison test를 이용하여 상아질 전단잡착강도를 분석한 결과, PAC 광중합기와 LED 광중합기 간에 유의성 있는 차이를 보이지 않았으며 (P > 0.05), 상아질 접착제와 광중합기의 교호관계에도 유의성이 없었다. 그러나 상아질 접착제는 상호간에 유의성 있는 차이를 보였다 (P< 0.001). The objective of this study was to compare dentin shear bond strength (DSBS) of dentin bonding agents (DBAs) cured with a plasma arc (PAC) light curing unit (LCU) and those cured with a light emitting diode (LED) LCU. Optical properties were also analyzed for Elipar freelight 2 (3M ESPE); LED LCU, Apollo 95E (DMT Systems); PAC LCU and VIP Junior (Bisco): Halogen LCU. The DBAs used for DSBS test were Scotchbond Multipurpose (3M ESPE), Singlebond 2 (3M ESPE) and Clearfil SE Bond (Kuraray). After DSBS testing, fractured specimens were analyzed for failure modes with SEM. The total irradiance and in-adiance between 450 ㎜ and 490 ㎜ of the LCUs were different. LED LCU showed narrow spectral distribution around its peak at 462 ㎜ whereas PAC and Haloaen LCU showed a broad spectrum. There were no significant differences in mean shear bond strength among different LCUs (P > 0.05) but were significant differences among different DBAs (P < 0.001).

중합조건에 따른 dual cured resin cement의 열분석적 연구

엄정문,정관희,이인복 大韓齒科保存學會 1999 Restorative Dentistry & Endodontics Vol.24 No.2

유한요소법을 이용한 수종 2급 아말감 와동의 비교연구

엄정문,석창인 大韓齒科保存學會 1995 Restorative Dentistry & Endodontics Vol.20 No.2

아말감의 표면연마에 관한 전기화학적 연구

엄정문,석창인 大韓齒科保存學會 1991 Restorative Dentistry & Endodontics Vol.16 No.2

수직 진동형 Rheometer를 이용한 복합레진의 유변학적 성질의 측정

이인복,조병훈,손호현,이상탁,엄정문 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.6

Objective: The purpose of this study was to investigate the viscoelastic properties related to handling characteristics of composite resins. Methods: A custom designed vertical oscillation rheometer (VOR) was used for rheological measurements of composites. The VOR consists of three parts: (1) a measuring unit, (2) a deformation induction unit and (3) a force detecting unit. Two medium viscous composites, Z100 and Z250 and two packable composites, P60 and SureFil were tested. The viscoelastic material function, including complex modulus E* and phase angle δ, were measured. A dynamic oscillatory test was used to evaluate the storage modulus (E′), loss modulus (E″) and loss tangent (tanδ) of the composites as a function of frequency (ω) from 0.1 to 20 ㎐ at 23℃. Results: The E′and E″ increased with increasing frequency and showed differences in magnitude between brands. The E*s of composites at ω= 2 ㎐, normalized to that of Z100, were 2.16 (Z250), 4.80 (P60) and 25.21 (SureFil). The magnitudes and patterns of the change of tanδof composites with increasing frequency were significantly different between brands. The relationships between the complex modulus E*, the phase angle δ and the frequency ωwere represented by frequency domain phasor form, E* (ω) = E*e^(iδ)= E*∠δ. Conclusions: The viscoelasticity of composites that influences handling characteristics is significant different between brands. The VOR is a relatively simple device for dynamic, mechanical analysis of high viscous dental composites. The locus of frequency domain phasor plots in a complex plane is a valuable method of representing the viscoelastic properties of composites.