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.

가압주사식 열가소성 의치상 레진과 이장 레진 간의 결합강도에 관한 연구

문태성,정창모,전영찬,임장섭,Moon Tae-Sung,Jeong Chang-Mo,Jeon Young-Chan,Lim Jang-Seop 대한치과보철학회 2002 대한치과보철학회지 Vol.40 No.1

The purpose of this study was to evaluate the bond strength of reline resin to pressure injection type thermoplastic denture base resin. The denture base resins used in this study were $Hi-polycarbonate^{(R)}$(High Dental Co., Japan), Acetal $dental^{(R)}$(Pressingdental s.r.1., Repubblica di San Marine) of thermoplastic resin and Acron $MC^{(R)}$(GC Dental Industrial Co., Japan) of heat cured resin. The reline resins used were Lucitone $199^{(R)}$(Dentsply international Inc., USA), Tokuso $rebase^{(R)}$(Tokuyama Corp., Japan), and $Lightdon-U^{(R)}$(Dreve-Dentamid-Gmbh, Germany). The reline resins are representative of heat-cured, self-cured, and light-cured resin respectively Bond strength was examined by use of a three-point transverse flexural strength test. The results were as follows 1. The bond strength of Lucitone 199 to Acron MC was the highest. 2. The bond strengths of Lucitone 199 and Tokuso rebase to Hi-polycarbonate resulted in a value of approximately one half that of Lucitone 199 to Acron MC and there were no significant differences between these and the bond strength of Tokuso rebase to Acron MC(p<0.05) 3. The bond strengths of reline resins to Acetal dental were lower than those of reline resins to Hi-polycarbonate. 4. For all base resins Lightdon-U showed lower bond strength than the other reline resins.

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]

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.

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.

Nonthermal plasma on the shear bond strength of relining resin to thermoplastic denture base resin

Liezl Manaloto-Ceballos,윌마트 라브리아가,송소연,박진홍,이정열,신상완 대한치과보철학회 2018 대한치과보철학회지 Vol.56 No.3

Purpose: This study evaluated the effect of nonthermal plasma treatment on the bond strength of autopolymerizing relining resin to the injection molded thermoplastic denture base resins (TDBRs) with different surface treatments. Materials and methods: Acrylic Resin (Acrytone), Polyester (Estheshot-Bright), Polyamide (Valplast) and Polypropylene (Weldenz) were subjected to various surface treatments: No treatment, Nonthermal plasma, Sandblasting, Sandblasting and nonthermal plasma. Specimens were bonded using an autopolymerizing relining resin. Shear bond strength was tested using universal testing machine with crosshead speed of 1 mm/min. Statistical analysis by two-way analysis of variance with Tukey’ test post hoc was used. Results: Acrytone showed significantly higher shear bond strength value among other TDBR group while Weldenz had the lowest. The sandblasting and nonthermal plasma condition had significantly higher shear bond strength value in all of the resin groups (P < .05). Conclusion: The use of nonthermal plasma treatment showed limited effect on the shear bond strength between TDBRs and relining resin, and combination of nonthermal plasma and sandblasting improved the shear bond strength between TDBR and reline material.

열가소성 수지의 단량체 분석 및 유해성 분류

이권섭 ( Kwon Seob Lee ),조지훈,최진희 ( Jin Hee Choi ),최성봉 ( Sung Bong Choi ),이종한 ( Jong Han Lee ),양정선 ( Jeong Sun Yang ) 한국산업위생학회 2007 한국산업보건학회지 Vol.17 No.4

This study covers the investigation of the actual condition in the workplace to produce plastics products using synthetic resins and the investigation on the trends amount of the domestic production of thermoplastic resins. To analyze the monomers included in thermoplastic resins frequently used in the workplace, we analyzed thermal characteristics for test compounds using thermogravimetric analysis and did the qualitative analysis using Pyrolyzer GC-MSD & TDS GC-MSD. And then we classified the health hazard of monomers based on GHS classification criteria using information toxicity & carcinogenicity. The number of the workplace to produce plastics products among all domestic manufacturers of 73,884 was 4,391 (5.94%). The number of workers to produce plastics products among all workers of 2,522,750 in all domestic manufacturers was 104,971 (4.16%). The amount of production per year for thermoplastic resins is in the order of PP, HDPE, LDPE, PVC, ABS, PS and such compounds was producing over 1 Million ton per year each. The classification result based on GHS classification criteria for 22 main compounds included thermoplastic resins says 2 compounds of acrylonitrile, naphthalene are in Acute oral category 3 and benzene is in Acute dermal category 1. The classification results of health hazard of carcinogenicity based on IARC & ACGIH carcinogen classification says 2 compounds of benzene, vinyl chloride are in category 1A (known to be human carcinogens).

Mechanical properties of ABS resin reinforced with recycled CFRP

Ogi, Keiji,Nishikawa, Takashi,Okano, Yasutaka,Taketa, Ichiro The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.2

This paper presents the mechanical properties of a composite consisting of acrylonitrile-butadiene-styrene (ABS) resin mixed with carbon fiber reinforced plastics (CFRP) pieces (CFRP/ABS). CFRP pieces made by crushing CFRP wastes were utilized in this material. Nine kinds of CFRP/ABS compounds with different weight fraction and size of CFRP pieces were prepared. Firstly, tensile and flexural tests were performed for the specimens with various CFRP content. Next, fracture surfaces of the specimens were microscopically observed to investigate fracture behavior and fiber/resin interface. Finally, the tensile modulus and strength were discussed based on the macromechanical model. It is found that the elastic modulus increases linearly with increasing CFRP content while the strength changes nonlinearly. Microscopic observation revealed that most carbon fibers are separated individually and dispersed homogeneously in ABS resin. Epoxy resin particles originally from CFRP are dispersed in ABS resin and seem to be in good contact with surrounding resin. The modulus and strength can be expressed using a macromechanical model taking account of fiber orientation, length and interfacial bonding in short fiber composites.

Optimal Polymerization Conditions in Thermoplastic-Resin Transfer Molding Process for Mechanical Properties of Carbon Fiber-Reinforced PA6 Composites Using the Response Surface Method

최찬웅,진지원,이학성,허몽영,강기원 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5

This study aims to optimize the polymerization conditions in a thermoplastic-resin transfer molding (T-RTM)process for the mechanical properties of carbon fiber-reinforced PA6 composites (CFPA6) using a response surface method. For this, a T-RTM process was first established with carbon fiber and caprolactam (PA6 monomer) as the base materials. Next, the injection speed, C20 (activator) rate, and C10 (catalyst) rate were selected as design variables that affect themechanical properties of the CFPA6 composites. Experimental conditions for the three design variables were establishedusing the central composite design (CCD) from the design of experiments (DOE) method. The significance of the CCD wasverified by analysis of variance (ANOVA) and sensitivity analysis. Finally, an optimization problem was solved with anobjective function of tensile strength and a constraint of the polymer conversion rate to identify the optimal CFPA6polymerization reaction conditions.

열가소성수지의 저항용접 응력분포 및 강도평가에 관한 연구

윤호철(Ho-Cheol Yoon),김철인(Chul-In Kim),김연직(Yun-Jig Kim),임재규(Jae-Kyoo Lim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

This research is concerned with a study on stress distribution and strength evaluation of thermoplastic resin using resistance welding. Tensile-shear tests were carried out with the single-lap resistance welded joined specimens consisting of thermoplastic resin. polypropylene(PP), polystyrene (PS) and polyetyrene(PE) were selected. Types of base material, diameter of heat element, voltage, current, electrified time and number of weld line are set on the parameters that govern the welding process and the principal phenomena that affect the quality of the joint. The test results were presented by tensile-shear strength and the experimental set-up and the main evaluation methods are also looked at in detail. The failure mechanism was discussed in order to explain the tensile-shear strength and stress distribution of resistance welding and the relationship between stress intensity and bonding strength properties were explained.