의치상용 레진 수리 시 섬유의 전중합 여부가 강화에 미치는 영향

유상희,김정미,오승한,배지명 大韓齒科器材學會 2009 대한치과재료학회지 Vol.36 No.2

Although fiber reinforcements are known to improve the mechanical properties of denture base materials, there is little information about the effects of pre-polymerized fibers on the mechanical properties of repaired denture base resins. The aim of this study was to evaluate the effect of pre-polymerization on the mechanical properties of repaired denture base resin. The heat-polymerized resin specimens(64 ? 10 ? 3.3 mm) were sectioned into two pieces, and repaired with three kinds of fibers. Glass fiber(GL: ER 270FW, Hankuk Fiber Glass), polyaromatic polyamide fiber(PA: Kevlar-49, Dupont), and ultra high molecular weight polyethylene fiber(PE: Dong Yang Rope) were used in this study. The test groups were classified as follows: (1) intact heat-polymerized resin(Heat), (2) heat-polymerized resin repaired with autopolymerized resin(Cont), (3) resin reinforced non-prepolymerized fibers, and (4) resin reinforced with pre-polymerized fibers. The flexural strength, modulus, and toughness were measured by an universal testing machine(Z020, Zwick, Germany) at a crosshead speed of 5 mm/min in a three-point bending mode. The data was analyzed by one-way ANOVA and the Duncanʼs multiple range test (⍺= 0.05). The difference of pre-polymerization fiber groups and non-prepolymerization fiber groups were statistically analyzed by unpaired Studentʼs t-test(⍺= 0.05). There were no effect of pre-polymerization of fibers on increasing flexural properties of denture base resin. PA without pre-polymerization showed most effective reinforcing effect on repaired denture base resin in terms of flexural strength, modulus and toughness. In this study, pre-polymerization of fiber was not effective in increasing the flexural properties of repaired denture base resin. Much efforts are required to increase the interfacial strength between denture base resin and pre-polymerized resin.

의치 세정제가 의치상 레진과 이장용 레진의 결합강도와 표면경도에 미치는 영향

김계순,정회열,김유리,조혜원,Kim Kyea-Soon,Jeong Hoe-Yeol,Kim Yu-Lee,Cho Hye-Won 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.4

Statement of problem : Removable partial denture and complete denture often require denture base relines to improve the fittness against tissue-bearing mucosa because of the gradual change in edentulous ridge contour and resorption of underlyng bony structure. Self-curing hard reline resins offers the immediate and relatively inexpensive means to be recondition the surface of denture base directly However weak bond between denture base resin and reline material can harbor bacteria, promote staining, or result in complete separation of the two materials. Purpose : The purpose of this study was to evaluate the effect of denture cleansers on bond strength and surface hardness of reline resin to denture base resin Denture base resin beams($60.0{\times}15.0{\times}3.0mm$) were made with Lucitone 199. Material and methods : 10mm section was removed from the center of each specimen. The samples were replaced in the molds and the space of l0mm sections were packed with Tokuso Rebase reline material. The specimens were immersed in denture cleansers (Polident, Cleadent) and were evaluated after 1 week, 2 weeks, and 4 weeks. The bond strength and surface hardness of self-curing hard reline materials to heat-curing denture base resin were measured using an UTM (universal testing machine). Results and conclusion : 1) There was no significant difference of usage, kind, and denture cleaner by application time on the bonding strength of self-curing hard reline resin to denture base resin. 2) There was no significant difference of usage, kind, and denture cleaner by application time on the surface hardness, but the surface hardness showed decreasing tendency, as the time of immersion was extended. 3) The failure modes of the specimens was initially adhesive failure and finally cohesive failure of self-curing hard reline resin.

다양한 레진 의치상의 적합도와 기계적 특성

이정환,이청재,이해형 대한치과의사협회 2019 대한치과의사협회지 Vol.57 No.12

This paper reviews the adaptation accuracy and mechanical properties of currently used denture processing systems with base resin materials and introduces the latest research on the development of antimicrobial denture base resins. Poly(methyl methacrylate) has been successfully used as a dental denture base resin material by the compress-molding method and heat polymerization for a long time, but recently, new processing techniques, injection molding-methods or fluid-resin technique are also used for fabricating denture base. However, studies indicated that there was no difference between the injectionmolding and the conventional compression-molding method in terms of adaption accuracy of denture base. The fluid-resin fabrication and one injection-molding systems exhibited better adaptation accuracy than the other processing methods. Resin denture bases in the oral cavity may undergo midline fractures due to flexural fatigue from repeated masticatory loading. For those patients, impact resistant denture base resins are recommended to prevent denture fracture during service. Thermoplastic denture base resins can be helpful for patients suffering from allergic reaction to resin monomers with a soft-fit, however, thermoplastic resins with low stiffness can irritate gum tissues and accelerate abnormal alveolar ridge resorption. Moreover, due to low chemical durability in oral cavity, those should be used for a limited period of time.

열중합 레진과 열가소성 레진틀니 제작방법에 관한 연구

남관우 ( Nam Gwan-woo ) 한국융합과학회 2018 한국융합과학회지 Vol.7 No.3

연구목적: 본 연구는 열중합 resin의 수축으로 인한 교합 및 접합 불량과, 기포에 음식물이 침투하여 부패하고 이로 인한 박테리아 번식 및 악취와, resin에서 잔류 모노머 용출로 인해 인체에 위해한 문제가 발생 하는 요인을 규명하고 개선하는데 주된 목적이 있다. 연구방법: 통상적인 중합형 레진(polymerization resin)의 액과 분말을 섞어서 조작하여 떡상의 레진을 몰드 내에 밀어 넣고 시험폐쇄(trial closure)후 압력을 가하며 중합하는 방법과, 열가소성 레진(thermoplastic resin)을 열과 압력 하에서 연화시켜 주입구를 통해 빈 몰드 안에 밀어 넣어 성형하고 냉각하면, 화학적 변화 없이 경화되어 성형된 상태를 유지하는 사출 방식의 denture 제작 방법을 비교하며 분석 하였다. 결론: 연구결과는 다음과 같다. 첫째, 중합수축 문제를 해결하여 수축으로 인한 변형이 없어 구강 조직에 편안하게 잘 맞으며 교합 또한 안정적인 틀니를 제공 할 수 있다. 둘째, 틀니의 수축기포를 해결하여 기포사이에 음식물이 침투하여 부패하고 이로 인해 박테리아가 번식하여 악취가 나는 틀니의 오염과 비위생적인 문제를 해결할 수 있다. 셋째, 틀니를 사용하는 상당기간 동안 용출하는 잔류모노머가 없어 인체에 악영향을 미치는 것을 예방할 수 있다. 넷째, 주입기에서 몰드로 주입시킨 후 냉각하면 되므로 작업시간 단축과 간편성은 중합수축을 줄이려고 개발되어진 여러 가지 공법들을 하나의 사출시스템으로 해결할 수 있어 획일적인 작업이 가능하다. Pupose: When the thermoplastic resin(thermoplastic resin) by softening under heat and pressure to mold and cooled and molded to research a manufacturing method of a Denture for holding the molded cured state was obtained without any chemical change in this result. Methods: A method of mixing a liquid and a powder of a polymerization resin and then pouring the resin in a mold into a mold and performing a trial closure and then applying a pressure to the mixture to polymerize the thermoplastic resin; The molds were softened and injected into the empty mold through the injection port. The molded and cooled molds were compared and compared with the injection molding denture manufacturing method which kept the molded state without chemical change. Conclusion: The results of the study are as follows. First, it solves the polymerization shrinkage problem, and it is not deformed due to contraction, so it can fit comfortably in the oral tissues and can provide a stable denture for occlusion. Second, it can solve pollution and unhygienic problems of dentures, which dissolve the contraction bubbles of the dentures and become contaminated by the food penetration between the bubbles, which causes the bacteria to reproduce. Third, there is no residual monomer eluting for a considerable period of time using the denture, and adverse effects on the human body can be prevented. Fourth, since injector injects into molds, it can be cooled. Therefore, it is possible to accomplish uniform work by shortening work time and simplifying various methods that have been developed in order to reduce polymerization shrinkage by using one injection system.

의치세정제와 소독제가 의치상 레진의 색조, 표면경도, 표면조도에 미치는 영향에 대한 연구

양희진,장복숙,정동준,허성주,한동후,심준성,장명우,Yang Hee-Jin,Jang Bok-Sook,Chung Dong-June,Heo Seong-Joo,Han Dong-Hoo,Shim June-Sung,Chang Myung-Woo 대한치과보철학회 2001 대한치과보철학회지 Vol.39 No.1

The purpose of this study is to compare effects of denture cleansers and disinfectants on the color. surface hardness, and surface roughness of reinforced acrylic resin using polyhedral oligosilsesquioxane molecules(POSS resin) to those of common resins. According to manufacturer's instructions, 45 specimens were made from three denture resins(Luciton 199, Paladent 20, POSS resin), and polished. Five denture cleansers(distilled water, glutaraldehyde, alkaline hypochlorites, chlorhexidine, alkaline peroxides) in combination with three denture resins were evaluated before and after immersion for 7 days. Color data in $L^*a^*b^*$ system were measured with a colorimeter. Surface hardness data were measured with a microhardness tester. Surface roughness data were measured with a 3-dimensional surface analyzer. Data were analyzed with two-way ANOVA, one-way ANOVA, and t-test. The results were as follows : 1. All resins(Luciton 199, Paladent 20, POSS resin) showed significant differences in color after immersion in hypochlorites(p<0.05). 2. POSS resin showed significant differences in color compared with Paladent 20 in all denture cleansers, but no statistically significant differences with Luciton 199(p<0.05). 3. Luciton 199 showed significant differences of surface hardness in chlorhexidine, Paladent 20 showed significant differences in glutaraldehyde and chlorhexidine. POSS resin showed a little change of surface in all denture cleanser, but no statistically significant differences(p<0.05). 4. Luciton 199 and Paladent 20 showed significant differences of surface roughness in hypochlorites and glutaraldehyde, and POSS resin showed no statistically significant differences in all denture cleansers(p<0.05).

레진 표면처리제가 열가소성 의치상 레진과 자가중합형 이장 레진 간의 결합강도에 미치는 여향

정창모,문태성 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

The introduction of several thermoplastic polymers was intended to overcome the disadvantages of methacrylate denture base resins. Existing dentures often require denture base relines to improve the fit against the tissue bearing mucosa because of gradual changes of underlying bone structure. Chair-side reline that used autopolymerizing acrylic resin is not only convenient but inexpensive means to improve the fit and function of denture bases. However, it is not known whether the differences in chemical composition of resin surface primers affect the bonding strengths between chair-side reline resin and thermoplastic denture base resin. This study evaluated two kinds of primers(exclusive primer recommended by manufacture of thermoplastic resin and primer supplied with chair-side reline resin) to determined their effect on the bond strengths of a chair-side reline resin to two different thermoplastic denture base resins(polycarbonate and polyacetal resin) by use of a three-point transverse flexural strength test. In both polycarbonate and polyacetal resin, each exclusive resin surface primer resulted in higher bond strength than chair-side reline resin primer(p<0.05). Bond strengths of polycarbonate with chair-side reline resin were higher than those of polyacetal resin, despite the type of resin surface primer(p<0.05).

의치상 레진의 세포독성에 관한 연구

김성균,장익태,허성주,곽재영,Kim Seong-Kyun,Chang Ik-Tae,Heo Seong-Joo,Keak Jai-Young 대한치과보철학회 2002 대한치과보철학회지 Vol.40 No.4

The purpose of this study was to investigate the cytotoxicity and mutagenicity of denture base resins. According to manufacturer's instructions, resin specimens were made. Group 1 : heat-polymerizing acrylic resin (Luciton $199^{(R)}$) Group 2 : heat-polymerizing acrylic resin containing polyhedraloligosilsesquioxane(POSS resin) Group 3 : auto-polymerizing acrylic resin (Repair $Acrylic^{(R)}$) Group 4 : direct relining auto-polymerizing acrylic resin (Tokuso $Rebase^{(R)}$). Fresh specimens 24 hrs. and 72 hrs. soaked specimens in distil)ed water were made. Responses with metabolic assay and mutagenesis assay to eluates from resin specimens were measured. Cultures with medium alone provided controls. Cytotoxicity was assessed with agar overlay test. The results were as follows; 1. Group 4 showed higher cytotoxicity than Group 1, Group 2 and Group 3 in fresh, 24-an4 72-hour immersion caries (p<.05). Group 3 showed higher cytotoxicity than Group 2 in fresh cases and showed higher cytotoxicity than Group 1 and Group 2 in 24-and 72-hour immersion cases (p<.05) . Group 1 and Group 2 showed no significant difference. 2. All acrylic denture base resins skewed significant increase of cell activity as immersion time increased (p<.05). 3. Auto-polymerizing acrylic denture base resins skewed higher cytotoxicity than heat-polymerizing acrylic denture base resins (p<.05). 4. All acrylic denture base resins showed lower mutagenicity than controls (p<.05).

Physical properties and color stability of injection-molded thermoplastic denture base resins

So-Yeon Song,Kyoung-Soo Kim,Jeong-Yol Lee,Sang-Wan Shin 대한치과보철학회 2019 The Journal of Advanced Prosthodontics Vol.11 No.1

PURPOSE.The purpose of this study was to compare mechanical and physical properties of injection-molded thermoplastic denture base resins. MATERIALS AND METHODS. In this study, six commercially available products (VA; Valplast, LC; Lucitone, ST; Smiltone, ES; Estheshot-Bright, AC; Acrytone, WE; Weldenz) were selected from four types of thermoplastic denture base materials (Polyamide, Polyester, Acrylic resin and Polypropylene). The flexural properties and shore D hardness have been investigated and water sorption and solubility, and color stability have evaluated. RESULTS. For the flexural modulus value, ES showed the highest value and WE showed significantly lower value than all other groups (P<.05). Most of experimental groups showed weak color stability beyond the clinically acceptable range. CONCLUSION. Within the limits of this study, thermoplastic denture base resin did not show sufficient modulus to function as a denture base. In addition, all resins showed discoloration with clinical significance, and especially polyamides showed the lowest color stability. [ J Adv Prosthodont 2019;11:32-40] PURPOSE.The purpose of this study was to compare mechanical and physical properties of injection-molded thermoplastic denture base resins. MATERIALS AND METHODS. In this study, six commercially available products (VA; Valplast, LC; Lucitone, ST; Smiltone, ES; Estheshot-Bright, AC; Acrytone, WE; Weldenz) were selected from four types of thermoplastic denture base materials (Polyamide, Polyester, Acrylic resin and Polypropylene). The flexural properties and shore D hardness have been investigated and water sorption and solubility, and color stability have evaluated. RESULTS. For the flexural modulus value, ES showed the highest value and WE showed significantly lower value than all other groups (P<.05). Most of experimental groups showed weak color stability beyond the clinically acceptable range. CONCLUSION. Within the limits of this study, thermoplastic denture base resin did not show sufficient modulus to function as a denture base. In addition, all resins showed discoloration with clinical significance, and especially polyamides showed the lowest color stability. [ J Adv Prosthodont 2019;11:32-40]

의치상 레진과 이장 레진 간의 결합강도 비교

금영희,김부섭 대한치과기공학회 2017 대한치과기공학회지 Vol.39 No.3

Purpose: We compare the bond strength of heat-cured PMMA of Lucitone 199 and QC-20 and Tokuyama Rebase Resin of self-cured resin, which are widely used and well accepted in clinical practice. In order to test the mechanical bonding and chemical bonding, we will compare the bond strength between EstheShot Bright, Smiletone, Repair and Rebase resins. Methods: The denture base resin used in this study was PMMA heat-cured QC-20 and Lucitone 199, polyamide resin EstheShot Bright, Smiletone. And Two types of self-curing Rapid Repair and Tokuyama Rebase were used as resection resins. To measure the bond strength, the denture specimens were fabricated in the size of 10×64×3.5 mm as instructed by the manufacturer. A surface treatment agent was applied to the cut surfaces of each denture specimen, and the specimens were placed in a preformed silicone mold, and autoclaved excimer resins were prepared. The bending strength of the fabricated specimens was measured using a universal testing machine (STM-5, United Calibration Co., U.S.A.) to measure the three-point bending strength. Results: In both polycarbonate and polyacetal resin, a special resin surface treatment agent showed higher bonding strength than the resin surface treatment agent(p<0.05). Regardless of the type of surface treatment, polycarbonate showed higher bond strength than polyacetal resin(p<0.05). Conclusion: It is considered desirable to use a special surface treating agent for the thermoplastic denture base resin such as polycarbonate and polyacetal resin.

의치상 레진의 표면 전처리가 연성 이장재와의 인장결합강도에 미치는 영향

윤민철,정창모,전영찬,Yoon, Min-Chul,Jeong, Chang-Mo,Jeon, Young-Chan 대한치과보철학회 2007 대한치과보철학회지 Vol.45 No.5

Statement of problem: The failure of adhesion between the resilient denture liner and the denture base is a serious problem in clinic. Purpose: The purpose of this study was to evaluate the effect of denture base resin surface pretreatments (mechanical and/or chemical) on the tensile bond strength between a resilient liner and processed denture resin. Material and method. Acrylic-based resilient liners (Soft liner; GC co., Japan & Coe-Soft; GC America Inc. USA) and silicone-based resilient liners (Mucosoft, Parkell Inc., USA & Dentusil; Bosworth co., USA) were used. Specimens in each soft lining material were divided two groups with or without mechanical pretreatment. Each denture base specimen received 1 of 4 chemical pretreatments including: (1) no treatment, (2) 30-s acetone treatment, (3) 15-s methylene chloride treatment, (4) 180-s methyl methacrylate treatment. All specimens were thermocycled and placed under tension until failure in a universal testing machine. Results: 1. Silicone-based resilient liners exhibited significantly higher tensile bond strengths than acrylic-based resilient liners (P<.05). 2. Grinding the denture base resin improved tensile bond strengths of silicone-based resilient liners, but reduced tensile bond strengths of acrylic-based resilient liners (P<.05). 3. In acrylic-based resilient liners, treating with acetone significantly increased the bond strength of Soft liner and treating with methyl methacrylate significantly increased the bond strength of Coe-Soft (P<.05). However they were not effective compared to silicone-based resilient liner. 4. In silicone-based resilient liners, treating with all chemical etchants significantly increased the bond strength of Mucosoft to denture base, and treating with methylene chloride and methyl methacrylate increased the bond strength of Dentusil to denture base (P<.05). Conclusion: Although chemical and mechanical pretreatments were not effective on tensile bond strength of acrylic-based resilent liner to denture base, treating the denture base resin surface with appropriate chemical etchants after mechanical pretreatment significantly increased the tensile bond strength of silicone-based resilient liner to denture base.