• 한국치위생학회지
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• 제9권3호
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• pp.369-379
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• 2009

This study investigated the polymerization inhibition effect of latex gloves on addition silicone impression material. Three different kinds of addition silicone impression materials and a natural latex gloves were used in this study. The results were as follows. 1. Compared to the control group, all of those three kinds of impression materials took longer curing time in order of unwashed, alcohol and washed group, on the other hand, degloving group had shorter curing time than control group(p<0.05). 2. By the type of impression materials, there was no significant difference observed between Exafine and Twinz in ungloved group, Exafine and Imprint II in unwashed group, and Exafine and Twinz in degloving group(p>0.05). 3. The degree of polymerization at 6 minutes after mixing impression materials was evaluated by dividing its range into score 1 to 5. All of the impression materials got score 5 in control group and degloving group, which implies perfect polymerization. In unwashed group, most of them appeared to be score 2 while score 3 were most frequently observed in alcohol group and score 4 in washed group. Thus each group showed differences in the degree of polymerization(p<0.05).

• 구강회복응용과학지
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• 제30권2호
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• pp.152-158
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• 2014

저작기능의 회복과 더불어 환자에게 편안함을 제공하며 잔존치아와 치조점막을 건강하게 유지할 수 있는 가철성 국소의치 제작을 위해서는 구강내의 형태적, 기능적 상태를 재현하는 모형제작이 필수적이다. 국소의치 제작을 위해서는 진단모형과 주모형의 제작이 필요하며 이를 위해서 예비인상과 최종인상 채득 과정을 거치게 된다. 국소의치의 인상채득은 고정성이나 총의치 인상과 다르게 치아부위와 조직부위 모두가 잘 인기되어야 하고 치아 결손 부위에 따라 교합을 지지하는 부위가 달라지므로 증례에 따른 적절한 인상재와 인상채득 방법에 대한 이해를 바탕으로 정확한 임상적 적용이 요구된다.

• 대한치과보철학회지
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• 제46권2호
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• pp.175-184
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• 2008

연구목적: 본 연구는 가변형 트레이 개발의 일환으로 그 시제품을 제작하고 비가역성 수성 콜로이드 인상재를 사용하여 중국인과 일본인에서 인상채득 시 트레이의 구강 내 적합성를 알아보고자 하였다. 연구재료 및 방법: 가변형 트레이는 한국 성인 악궁의 크기 분석결과를 기본으로 하여 설계하였으며, 먼저 CAD-CAM 작업을 통하여 견본 모형을 제작한 후, 이를 똑같이 복제한 실리콘 간이금형을 만들었다. 그리고 이 금형에 polyurethane을 주입하여 다수의 시제품을 완성하였다. 시제품을 이용하여 중국인으로는 상해 제2의과대학교 구강의학원 학생 60명 (남자 30명, 여자 30명)을 대상으로 하였고, 일본인으로는 일본 구마모토 고등학교 졸업생 60명 (남자 30명, 여자 30명)을 대상으로 인상채득을 실시하고, 측정부위별로 인상체의 두께와 길이를 측정한 후 통계처리를 하여 그 적합성을 평가하였다. 결과: 1. 중국인과 일본인 모두 스탑과 경사면에 의해 트레이의 폭이 적절히 조절되어 대체적으로 3-6mm의 균일한 인상체의 두께를 얻을 수 있었다. 2. 중국인의 상악 트레이에서는 전치 순측 변연부에서 두께가 6.2mm, 견치 순측 변연부에서 두께가 5.9mm, 구개부 중앙은 10.5 mm, 구개부 후방은 9.7mm 높이로 비교적 인상체의 두께가 크게 측정되었다. 3. 중국인의 하악 트레이에서는 제1, 2소구치 접촉점 설측 변연부에서 인상체의 길이가 8.9mm, 전치 설측 변연부에서 7.2mm로 길게 나타났으며, 견치 순측 6.8mm, 소구치 순측 7.0mm로 인상체의 두께가 크게 측정되었다. 4. 일본인의 상악 트레이에서는 전치 순측 변연부에서 두께가 7.4mm, 견치 순측 변연부에서 7.7mm, 구개부 중앙은 9.1mm 높이로 인상체의 두께가 비교적 크게 측정되었다. 5. 일본인의 하악 트레이에서는 견치 순측 7.4mm, 제1, 2소구치 접촉점 순측 변연부 8.4mm로 인상체의 두께가 크게 측정되었다. 결론: 본 가변형 치과 인상용 트레이는 한국인 모형 계측치를 바탕으로 설계되어 한국인에서 적합성이 우수하며, 본 실험의 결과 중국인과 일본인에서도 적합성이 좋아 본 트레이를 범용하여 쉽고 정확한 인상채득을 할 수 있을 것이다.

• 대한치과보철학회지
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• 제32권3호
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• pp.445-454
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• 1994

Osseointegrated implant prostheses are to provide normal function without compromising the unique interaction between the tissue and the implant. The essential requirement for the osseointegrated implant prostheses is passive fit of abutment. Therefore, the impression must be accurate and reproduciable since the resultant master cast precisely duplicates the clinical condition. The purpose of this study was to compare the accuracy of the master casts obtained from five impression techniques. Group 1 : To take impression with indirect technique and Impregum F. Group 2 : To take impression with unsplinted direct technique and Impregum F. Group 3 : To take impression with splinted direct technique and Impregum F. Group 4 : To take impression with unsplinted direct technique and Xanthano. Group 5 : To take impression with splinted dierct technique and Xanthano. The results were as follow : 1. In taking impression of Impregum F, there was no significant difference between to use of indirect technique and unsplinted direct technique.(p<0.05) 2. Unsplinted direct technique with Impregum F is less accurate than splinted direct technique with Impregum F or Xanthano and unsplinted direct technique with Xanthano.(p<0.05). 3. There was no significant difference between splinted direct technique with Impregum F and unsplinted direct technique with Xanthano.(p<0.05) 4. Splinted direct technique reproduce more accurate than unsplinted direct technique.(p<0.05) 5. Impression plaster produced less distortion than polyether.(p<0.05) As a result, splinted direct technique with Xanthano was the most accurate technique. As a result, splinted direct technique with Xanthano was the most accurate technique in this study. In addition to dimensinal changes in the materials used, positional errors were also attributed to the mechanical components used in the transfer porocess. Although the errors measured were relatively small, this study demonstrates the potential for distortions with the transfer technique used. Further study is indicated that ?the technique will be able to reproduce the intraoral relationship of implant fixtures reliably and predictably.

• 대한치과보철학회지
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• 제40권2호
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• pp.140-155
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• 2002

Void-free impression taking is important for the fabrication of accurate dental restorations. One of the essential properties of an impression material used for indirect fabrication of precision castings is the reproduction of the fine detail. The objective in this study was to determine the influence of mixing methods on the number of voids and surface detail reproduction. The number of voids and surface detail reproduction were evaluated with the steteomicroscope $SZ-PT^{(R)}$ and photographed. The results were as follows ; 1. In comparison of the void formation according to mixing methods of all impression materials, mechanical mixing was better than hand mixing and there was significant difference(p<0.05) 2. In comparison of the void formation according to hand mixing of alginate impression materials($TOKUSO\;A-1{\alpha}^{(R)},\;CAVEX\;IMPRESSIONAL^{(R)},\;AROMA \;FINE\;DF\;III^{(R)}$), there was no significant difference among alginate groups. But the number of void was increased in the order of $Panasil^{(R)}\;contact,\;TOKUSO\;A-1{\alpha}^{(R)},\;Permlastic^{(R)}$ light bodied and there was significant difference (p<0.05). 3. In comparison of the void formation according to mechanical mixing of alginate impression materials($TOKUSO\;A-1{\alpha}^{(R)},\;CAVEX\;IMPRESSIONAL^{(R)},\;AROMA FINE\;DF\;III^{(R)}$), there was no significant different among alginate groups. But the number of void was decreased in order of $TOKUSO\;A-1{\alpha}^{(R)},\;Permlastic^{(R)}light\;bodied,\;Panasil^{(R)}$ contact and there was significant difference (p<0.05). 4. In comparison of the surface detail reproduction according to mixing methods of 3 types of impression materials($TOKUSO\;A-1{\alpha}^{(R)},\;Permlastic^{(R)}\;light\;bodied,\;Panasil^{(R)}\;contact$), there was no significant difference between hand mixing and mechanical mixing method 5. The surface detail reproduction was only influenced by impression materials, and produced better in order of $TOKUSO\;A-1{\alpha}^{(R)},\;Panasil^{(R)}\;contact,\;Permlastic^{(R)}$ light bodied. There was significat difference among 3 type of impression materials(p<0.05). From the above results, void formation is influenced by mixing methods and surface detail reproduction is influenced by impression materials than mixing methods. Therefore, to fabricate accurate restorations, proper impression material and mechanical mixing method are more effective and available clinically.

• 치위생과학회지
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• 제10권6호
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• pp.459-464
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• 2010

본 연구는 실리콘 고무인상재의 보관온도에 따른 작업 시간과 압축 시 변형율, 탄성회복율, 점조도에 관한 물리적 특성에 대해서 평가하였으며, 다음과 같은 결과를 얻었다. 1. 작업시간은 저온의 온도유지장치에서 보관한 인상재가 실온이나 고온에서 보관한 인 상재보다 유의하게 크게 나타났고(P<0.05), 실온과 고온에서 보관한 인상재는 유의차 가 없었다. 2. 압축변형율은 저온 온도유지장치에서 보관한 인상재가 실온이나 고온에서 보관한 인 상재보다 유의하게 컸으며(P<0.05), 실온과 고온에서 보관한 인상재는 유의차가 없 었다. 3. 탄성회복율은 인상재를 보관한 각 저장온도에 따라 유의한 차이가 있는 것으로 나타 났으며(P<0.05), 온도가 높아짐에 따라 증가하였다. 4. 점조도는 인상재를 보관한 각 저장온도에 따라 유의한 차이가 있는 것으로 나타났으 며(P<0.05), 온도가 높아짐에 따라 감소하였다.

• 구강회복응용과학지
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• 제23권3호
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• pp.239-248
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• 2007

The accuracy and dimensional stability of rubber impression materials are very important for the fitness of the final restoration. The purpose of this investigation was to evaluate the effects of the storage time and pouring frequency of the additional silicone materials on dimensional stability. Total 30 impressions were made of tooth prepared single crown. The dies had 1 buccolingual, 1 mesiodistal and 1 occlusogingival lines. Two additional silicone materials(examixfine, aquasil) were included. 15 specimens were made of each impression material and poured by type IV stone over times(1hour, 24hours, 72hours) after mixing. 5 impressions poured after 1 hour were used for second pouring after 24hours and third pouring after 72hours. The same examiner measured each specimen 3 times after lazer scanning. All statistical tests were performed with the level of significance set at 0.05. The results indicated that significant difference at any measuring point of stone dies except the buccolingual and mesiodistal lines of the specimen made at 1hour after mixing with examixfine when measurements at 1hour, 24hours and 72hours were campared. There were significant difference between two impression materials and at every measuring point of stone dies made at second and third pouring. The length of measuring point increased significantly as time passed by and increase of the pouring frequency. However, this results are clinically acceptable except the dies of the third pouring. Under the conditions of this study, the shrinkage rate of the additional silicone rubber impression materials significantly increased as time passed by and increase of the pouring frequency.

• 대한기계학회논문집
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• 제19권3호
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• pp.877-885
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• 1995

Cold forging die for metal scissor is made by electric discharge machine. The impression of female die is made by electric discharge machine, the heat treatment is applied, and the impression is polished. When we forge goods by using this kind of die, the abrasion is severe and the crack occurs after forging about 240 strokes. Because the die should be frequently produced in the case, the cost rises, the work is delayed, and the precesion of goods is not good. Therefore, the electric discharge machine was not used in this study. Main die was produced by making hob, installing the hob to cold hobbing press, indenting the die material, and cold hobbing the impression. The die life was increased to 5,000-6,000 strokes in this case. In the future study, the die life will be increased to 10,000 strokes by changing the following : (1) the pre-treatment of slug, (2) the structure of die block, (3) the heat treatment of die material

• Restorative Dentistry and Endodontics
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• 제43권1호
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• pp.9.1-9.6
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• 2018

The objective of this case report is to introduce a simple technique for simultaneously taking a closed-mouth impression and functionally generated path (FGP) for a full coverage crown restoration. A monolithic zirconia crown was the restoration of choice. An alginate impression of the abutment tooth was taken to fabricate a custom-made closed-mouth impression tray covering the abutment tooth and the adjacent teeth. The tray had an FGP table and an abutment tray in cameo and intaglio surfaces, respectively. The impression was taken with silicone impression material after adjusting the abutment tray and inscribing the FGP using self-curing acrylic resins. Plaster casts were made from the impression, and a zirconia crown was fabricated. The crown was cemented to the abutment tooth with minimal adjustments. This simple technique resulted in a well-fitting crown that accounted for mandibular movements. Using the custom closed-mouth impression tray incorporating an FGP table simultaneously aids in fabricating an accurately fitting restoration that incorporates harmonious mandibular movements using a single impression capture.

• The Journal of Advanced Prosthodontics
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• 제8권5호
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• pp.372-379
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• 2016

PURPOSE. Alginate mixers available in the market do not have the automatic proportioning unit. In this study, an automatic proportioning unit for the alginate mixer and controller software were designed and produced for a new automatic proportioning unit. With this device, it was ensured that proportioning operation could arrange weight-based alginate impression materials. MATERIALS AND METHODS. The variation of coefficient in the tested groups was compared with the manual proportioning. Compression tension and tear tests were conducted to determine the mechanical properties of alginate impression materials. The experimental data were statistically analyzed using one way ANOVA and Tukey test at the 0.05 level of significance. RESULTS. No statistically significant differences in modulus of elastisity (P>0.3), tensional/compresional strength (P>0.3), resilience (P>0.2), strain in failure (P>0.4), and tear energy (P>0.7) of alginate impression materials were seen. However, a decrease in the standard deviation of tested groups was observed when the customized machine was used. To verify the efficiency of the system, powder and powder/water mixing were weighed and significant decrease was observed. CONCLUSION. It was possible to obtain more mechanically stable alginate impression materials by using the custom-made proportioning unit.