• 대한치과보철학회지
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• 제34권4호
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• pp.850-868
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• 1996

The accuracy and dimensional stability of impression materials are one of the most important factors for successful prosthodontic treatment. The purpose of this study was to evaluate the accuracy of several dental elastomeric impression materials used widely and clinically : Impregum-$F^{(R)},\;Permlastic^{(R)},\;Silascon^{(R)},\;Perfect^{(R)},\;Xantopren^{(R)}$. There have been many studies to evaluate the accuracy of impression materials. But it has not been decided yet, which method was most suitable for the evaluation of the accuracy. In this study, two resin teeth, #15 & 25, were prepared with rounded shoulder margin and 90 degree cavosurface angle. For the polysulfide rubber and polyether, the custom tray was made at least 24 hours prior to impression taking. For the silicone rubber materials, putty/wash impression technique was applied in taking impressions. Marginal openings of the castings on the master dies and prepared resin teeth were measured under stereomicroscope. The results were statistically analyzed and compared between tested impression materials. The results were as follows ; 1. In the overall accuracy of impression materials, polyether was the most accurate one, followed by polysulfide, additional silicone and condensation silicone. 2. On the first model pouring, condensation silicone had the largest discrepancies and there was significant difference compared to the other impression materials. 3. Polysulfide had the least discrepancies in the first model pouring, but showed larger discrepancies in the immediate second pouring than the first pouring. 4. On the immediate second pouring, the discrepancy of polyether was shown to be the smallest, while the largest one was additional silicone. 5. Polyether and polysulfide rubber using custom impression trays showed superior accuracy to silicone rubber, putty/wash impression technique.

• 한국치위생학회지
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• 제8권4호
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• pp.89-99
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• 2008

In this study, polyvinylsiloxane impression materials were investigated to examine the characteristics of the impression materials that affect the accuracy of the final restoration. The flow property of impression materials which can reproduce the detail in the oral cavity and accurately duplicate it, and the tear strength and strain-in-compression which can cause problems when it is being removed from the oral cavity were studied. The results are as follows. 1. As for the flow properties of impression materials, Imprint II was 18.24${\pm}$0.30, which was the highest: and Twinz was 8.9${\pm}$0.62, which was the lowest. There was no significant difference among Imprint II, Examixfine, and Genie(p<0.05). 2. As for the tear strength of impression materials, Imprint II had the highest level, while Genie had the lowest value. There was no significant difference between Twinz and Genie(p<0.05). 3. As for the strain-in-compression, there were significant differences by impression material groups(p<0.05); the strain-in-compression of Examixfine was shown to be the highest at 5.56${\pm}$0.56, Twinz and Imprint II followed respectively, and Genie has the lowest at 3.19${\pm}$0.23. 4. Flow showed the correlation with tear strength but no significant connection to strain-in-compression. Also, there was no significant correlation between the tear strength and strain-in-compression (p<0.05). Making impression to reproduce oral tissue and tooth is an important part of making final restoration. The accuracy of impressions is influenced by the methods of taking impression or other condition. However the property itself of impression materials is the most essential and the materials with proper qualities should be selected.

• 대한치과보철학회지
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• 제27권2호
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• pp.131-141
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• 1989

This study was designed to investigate the fitness of stock tray in Korean adults. 107 dental students (male: 87, female: 20) who have normal occlusion and symmetric facial fom were selected. The upper and lower stock tray (Osungtray, Osung Co., Korea) fit with dental arch were selected for taking irreversible hydrocolloid impression. The author measured the thickness of impression material about two items, that is, width and length on the flange of stock tray. Several measuring points on the dental arches and palatal area were checked with Goldman Fox prove (Hu-Friedy, U.S.A.). The obtained results were as follows: 1. The width of impression material on buccal flange of upper and lower trays were narrower than any other measuring point, but the thickness of impression material on the palatal area of upper stock tray was the widest of all measuring points. 2. The length on buccal flange of lower stock tray was shorter, but the length on tray flange of lower stock tray at lingual frenum area was longer. 3. On upper dental arch, the upper extra-large tray was used in 53% of subjects, but upper small tray was not used. 4. On lower dental arch, the large tray was used in 55% of subjects. 5. There was not adequate tray on upper dental arch in 4 subjects.

• 대한치과마취과학회지
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• 제14권2호
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• pp.119-126
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• 2014

Difficulty in breathing can be very disconcerting to a patient who is conscious yet unable to breath normally. The common causes of acute respiratory distress include hyperventilation, vasodepressor syncope, asthma, heart failure, and hypoglycemia. In most of these situations, the patient does not exhibit respiratory distress unless an underlying medical disorder becomes acutely exacerbated. Examples of this include acute myocardial infarction, anaphylaxis, cerebrovascular accident, hyperglycemia, and hypoglycemia. A major factor that leads to the exacerbation of respiratory disorders is undue stress, either physiologic or psychologic. Psychologic stress in dentistry is the primary factor in the exacerbation of preexisting medical problems. Therefore, the most dental patient should be cared gently as the stress reduction protocol. This is a case report of acute respiratory distress with vasodepressor syncope during alginate impression taking of mandibular teeth in a long-standing temporomandibular joint dislocated 93-years-old pneumonic patient.

• The Journal of Advanced Prosthodontics
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• 제9권5호
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• pp.341-349
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• 2017

PURPOSE. This study evaluated the accuracies of different bite registration techniques for implant-fixed prostheses using three dimensional file analysis. MATERIALS AND METHODS. Implant fixtures were placed on the mandibular right second premolar, and the first and second molar in a polyurethane model. Aluwax (A), Pattern Resin (P), and Blu-Mousse (B) were used as the bite registration materials on the healing abutments (H) or temporary abutments (T). The groups were classified into HA, HP, HB, TA, TP, and TB according to each combination. The group using the bite impression coping was the BC group; impression taking and bite registration were performed simultaneously. After impression and bite taking, the scan bodies were connected to the lab analogs of the casts. These casts were scanned using a model scanner. The distances between two reference points in three-dimensional files were measured in each group. One-way ANOVA and Duncan's test were used at the 5% significance level. RESULTS. The smallest distance discrepancy was observed in the TB group using the temporary abutments. The Blu-Mousse and HP groups showed the largest distance discrepancy. The TB and BC groups showed a lower distance discrepancy than the HP group (P=.001), and there was no significant difference between the groups using the temporary abutments and healing abutments (P>.05). CONCLUSION. Although this study has limitations as an in-vitro investigation, the groups using the temporary abutments to hold the Blu-Mousse record and bite impression coping showed greater accuracy than the group using the healing abutments to hold the pattern resin record.

• 구강회복응용과학지
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• 제27권1호
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• pp.117-123
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• 2011

총의치 환자의 치료 시 인상 채득 과정은 의치의 지지, 유지, 그리고 안정을 위해 매우 중요하며, 의치의 성공여부를 좌우한다. 총의치 인상 채득을 위한 여러 가지 재료와 방법들이 이용되어 왔으며, 그 중 조직 양화재 (tissue conditioner)를 이용한 동적 인상법 (dynamic impression method)은 보다 생리적이고 기능적인 방법이다. 본 증례들에서는 무치악 환자에서 조직 양화재인 Coe-comfort$^{(R)}$ (GC America, IL, USA)를 이용한 동적 인상법으로 변형된 연조직의 회복과 하께 가장 생리적인 상태로 인상을 채득하여 의치의 제작 및 첨상을 시행하였으며, 만족스런 결과를 얻었다.

• 한국치위생학회지
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• 제8권2호
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• pp.53-66
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• 2008

There was to purpose of this study improves analyzing cause that prosthesis brings bite engaging that is inaccurate in patient's mouth, when supposed that all conducts that do in operatory and dental laboratory are perfect. Impression did check bite by alginate impression material and polymerization style silicon impression material that use usually in presence at a sickbed Irreversibility, hydrocolloid, alginate impression material washed in flowing water and poured anhydrite after wait about 8 minutes so that region that charge interest after impression check bite may become undoing. And hydrophile property addition polymerization style impression material poured anhydrite after blow 30 considering impression material dwell time and H2 gas occurrence time (5~15 minute) after have washed in flowing water. I got each 7 models, result that manufactures total 28 and measures by third dimension measuring instrument (Meteo, Korea) following sequence curing in tray holder and floor 1, By Alginate impression when is hardened in tray holder and when is hardened in the floor after do check bite, SPH 4, SPH5 all as there is synonymy appeared(P<0.05). By in case do not use average 0.1741 in case use tray holder in 0.0447 SPH5s in case do not use average 0.2838 pastas in case use tray holder in SPH4 0.0309, When did not use both SPH4 and SPH5 tray holder, when used tray holder, 1 appeared more greatly. 2. By amity sex addition polymerization style silicon impression when is hardened in tray holder after do check bite and when is hardened in the floor SPH 4, a11 of the SPH5s very big synonymy be(P>0.05). And in case use tray holder in 0.000657 pasta SPH5s in case do not use average 0.000129 pastas in case use tray holder in SPH4 average 0.000114 pastas, by in case do not use 0.000757, I appeared more greatly when used tray when did not use both SPH4 and SPH5 tray holder, but 1 appeared is not level to keep in mind(Table 8~9). 3 SPH4 was looked very big mindfulness in model that manufacture doing impression check bite by Alginate and model that do impression check bite by amity sex accessory penalty silicon without using tray holder(P< 0.001). I use tray holder and SPH4 did not appear synonymy in model that manufacture doing impression check bite by Alginate and model that do impression check bite by amity sex accessory penalty silicon(P>0.05). Study finding of above when see synthesis Alginate certainly tray holder use must and I could know that hardening method does not exert big influence on volume stability if remove impression sieve of excess because amity sex accessory penalty silicon passes over tray, Also, Alginate impression material previewed can get heading a conspiracy style that volume stability of accessory penalty silicon impression material degree is if use tray holder.

• 대한치과보철학회지
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• 제57권3호
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• pp.238-244
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• 2019

연성 이장재는 점탄성적 특수성으로 인하여 인상 채득 후 바로 치과용 경석고를 주입할 시, 기능 인상에 사용할 수 있다. 본 증례는 78세의 남성으로 새로운 의치를 제작하고 싶다는 주소로 내원하였다. 하악 치조제의 심한 흡수로 인하여, 폐구법을 통한 기능 인상을 채득하기로 계획하였다. 먼저, 상, 하악 임시 의치의 제작을 시행하고, 연성 이장재를 내면에 도포하여 압박된 상, 하악 무치악 치조제의 치유를 유도하였다. 이후, 회복된 상, 하악 치조제에 맞게 내면이 변형된 상, 하악 임시 의치를 이용하여 폐구법을 통한 기능 인상을 채득하였으며, 상악 임시 의치의 치아 배열을 참고하여 최종 의치를 제작하였다. 이상과 같이 완전 무치악 환자에서 임시 의치를 이용하여 기능 인상을 채득하여 만족스러운 유지와 기능을 회복할 수 있었기에 본 증례를 보고하고자 한다.

• The Journal of Advanced Prosthodontics
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• 제11권5호
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• pp.271-279
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• 2019

PURPOSE. The newest technologies for digital implant impression (DII) taking are developing rapidly and showing acceptable clinical results. However, scientific literature is lacking data from clinical studies about the accuracy of DII. The aim of this study was to compare digital and conventional dental implant impressions (CII) in a clinical environment. MATERIALS AND METHODS. Twenty-four fixed zirconia restorations supported by 2 implants were fabricated using conventional open-tray impression technique with splinted transfers (CII group) and scan with Trios 3 IOS (3Shape) (DII group). After multiple verification procedures, master models were scanned using laboratory scanner D800 (3Shape). 3D models from conventional and digital workflow were imported to reverse engineering software and superimposed with high resolution 3D CAD models of scan bodies. Distance between center points, angulation, rotation, vertical shift, and surface mismatch of the scan bodies were measured and compared between conventional and digital impressions. RESULTS. Statistically significant differences were found for: a) inter-implant distance, b) rotation, c) vertical shift, and d) surface mismatch differences, comparing DII and CII groups for mesial and distal implant scan bodies ($P{\leq}.05$). CONCLUSION. Recorded linear differences between digital and conventional impressions were of limited clinical significance with two implant-supported restorations.

• 구강회복응용과학지
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• 제39권1호
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• pp.9-20
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• 2023

목적: 하악 부분 무치악 모형에서 pick-up type 인상용 코핑을 사용한 개방형 인상 채득법과 transfer type 인상용 코핑을 사용한 폐쇄형 인상 채득법, 개방형 인상 채득법에서 pick-up type 인상용 코핑 고정 재료에 따른 인상 채득 정확성을 비교 하고자 하였다. 연구 재료 및 방법: 하악 부분 무치악 모형의 좌측 구치부에 직경 4.5 mm, 길이 11.5 mm의 임플란트 고정체 두 개 식립 후 3D 프린터를 이용하여 개방형 개인 트레이 30개 폐쇄형 개인 트레이 10개를 제작하였다. 제작한 개인 트레이를 이용하여 PN군: 개방형 인상 채득법(non-splint), PG군: 개방형 인상 채득법(splint GC pattern resin), PH군: 개방형 인상 채득법(splint Herifix), TN군: 폐쇄형 인상 채득법으로 나누어 각 군당 10회씩 총 40회의 인상 채득을 진행하였다. 인상채득 후 석고 모형을 제작하여 모델 스캐너로 스캔 후 역설계 프로그램으로 스캔오차를 측정하여 95% 유의수준으로 평가 하였다. 결과: 폐쇄형 인상 채득법 TN군이 개방형 인상 채득법 PN군 보다 더 낮은 오차값을 보였다. 개방형 인상 채득법(splint)에 사용된 인상용 코핑 고정 재료 간의 비교 결과에서는 PH군에서 가장 낮은 오차값을 보였으며 PN군, PG군 순으로 정확한 인상 채득 정확성을 보여주었다. 결론: 임플란트 인상 채득 방법이나 인상용 코핑의 연결 고정 유무에 따른 각 군 간의 정확성에 유의한 차이는 없다.