• 한국임상수의학회지
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• 제32권2호
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• pp.141-147
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• 2015

본 연구는 고양이 십이지장에서 내시경적 조직 생검 시 사용된 다양한 겸자의 특징에 따른 조직의 질과 조직병리학적 적합성에 대해 평가하였다. 이러한 내시경용 생검 겸자에 따른 조직의 질과 적합성에 대한 연구는 인의에서 다수 보고되었으며 최근 개에서의 연구가 보고되었으나 고양이에서의 연구는 진행되지 않았다. 따라서 본 연구에서는 기존의 연구 결과와 고양이에서의 결과를 비교하여 그 차이를 확인하고자 하였다. 총 3마리의 건강한 고양이의 십이지장에서 3가지 종류의 생검 겸자를 사용하여 두 명의 실험자가 각각의 겸자 당 5 개씩의 시료를 채취하여 총 90개의 십이지장 점막 조직을 획득하였다. 획득한 조직은 각각 무게와 길이, 깊이, 부서진 인공구조, 조직병리학적 적합성에 대해 평가하였다. 내시경 생검용 겸자에 의한 조직의 질은 컵이 큰 겸자의 경우 더 무겁고 긴 조직을 얻는데 효과적인 결과를 얻었으며 이는 기존의 사람과 개에서의 연구와 비슷하다. 그러나 조직의 깊이와 부서진 인공구조, 특히 조직병리학적 적합성에 있어서는 겸자의 컵 크기나 모양에 따른 차이가 나타나지 않았으며 이는 기존의 연구와 다른 점이다. 하지만 조직학적 적합성이 있다고 평가된 조직들은 길이가 길고 인공구조가 적게 나타났으며 이러한 조직의 질은 겸자의 종류에 따른 차이를 보였다. 따라서 겸자의 종류는 조직의 질에 영향을 미치며 이는 간접적으로 조직학적 적합성과 관련이 있을 것으로 생각된다. 이를 바탕으로 고양이의 내시경적 생검 시, 비록 작은 컵의 겸자로도 조직병리학적으로 적합한 조직을 얻을 수 있지만 더 나은 질의 조직을 얻기 위해서 큰 컵의 겸자를 적용하는 것이 효과적인 것으로 생각된다.

• 대한치과보철학회지
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• 제46권4호
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• pp.325-334
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• 2008

연구목적: 본 연구의 목적은 하악골 충격 시 구강보호장치의 재료적 성질에 따른 악골과 두부에 미치는 영향을 조사하는 것이다. 연구재료 및 방법: 경질과 연질의 서로 다른 성질을 가지는 구강보호장치를 두부외상이나 뇌질환 병력이 없고 정상교합과 자연치열을 가진 한국 성인 여성에게 제작하고, CT를 이용하여 악골과 두부의 3차원 유한요소모델을 제작하였다. 이 유한요소모델은 두개골, 뇌, 상악골, 하악골, 관절원판, 치아와 구강보호장치를 포함하며 407,825개의 elements와 82,138개의 node로 구성되어 있다. 0.1초동안 하악골 3부위에서 800 N으로 사선 방향의 힘을 가하였을 때 두 가지 재료에 따른 상악 치아, 상악골 및 두개골의 응력분포를 평가하였고 동일한 조건하에서 두 재료에 따른 뇌의 변위량을 비교하였다. 결과: 이 연구를 통해 다음과 같은 결과를 얻었다. 1. 상악치아에서 유효응력 값을 비교하였을 때 연질의 구강보호장치가 경질의 구강보호 장치보다 응력값이 유의차 있게 작게 나타났다 (P < .05). 2. 상악골과 두개골에서 응력값을 비교하였을 때 연질의 구강보호장치가 경질의 구강보호장치보다 응력값이 유의차 있게 작게 나타났다 (P < .05). 3. 경질의 구강보호장치에서 연질의 구강보호장치보다 상악치아 및 상악골과 두개골에 더 많은 응력집중부위를 보였다. 4. 경질의 구강보호장치와 연질의 구강보호장치 간에 하악 충격 시 뇌의 변위량은 연질의 구강보호장치 쪽이 크게 나타났으나 유의차는 없었다. 본 연구를 통하여 악골 충격 시에 경질 및 연질 구강보호장치가 상악골과 두개골에서의 응력분포에 미치는 양상을 알 수 있었지만, 아직도 이의 상관관계를 모두 파악하기에는 불충분한 점이 많으리라 생각되며, 스포츠 외상에 따른 구강보호장치의 재료에 따른 상관관계에 대하여 보다 더 많은 연구가 필요할 것으로 사료된다.

• 대한장애인치과학회지
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• 제8권1호
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• pp.1-9
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• 2012

Mobile oral exam at the facilities for the disabled in Seoul is to improve the oral health of the disabled who can hardly approach dental clinic. We analyzed 1609 oral exam records at 24 facilities (11 special-education schools, 10 living facilities, 2 mental hospitals, 1 health care facility for the elderly) in 2011. The purpose of this study is to figure out the oral health state of the disabled in facilities in Seoul and to compare with the non-disabled in National Survey 2010 and 2008. 1. Special-education school : DMFT index of age 15 is 5.4 which is higher than 3.6 (DMFT index of age 15) of National Survey in 2010. 2. Living facility : DMFT index of ages 35~44 is 8.4 which is higher than 5.2 (DMFT index of ages 35 ~44) of National Survey in 2008. DT rate is higher (31.3% vs 19.2%) and MT rate is lower (7.6% vs 15.5%). 3. Mental hospital : DMFT index of ages 35~44 is 11.3 which is higher than 5.2 (DMFT indext of age 35~44) of National Survey in 2008. DT rate is significantly higher (50.7% vs 19.2%) and FT rate is lower (35.1% vs 65.3%). 4. Health care facility for the elderly : DMFT index of ages 65~74 is 7.1 which is slightly lower than 8.7 (DMFT index of ages 65~74) of National Survey in 2008. The number of existing natural teeth is similar (16 vs 18).

• 대한치과보철학회지
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• 제55권3호
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• pp.311-318
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• 2017

임플란트 지지 혹은 유지 피개 의치에서 다양한 종류의 유지 장치가 사용되어 왔다. Locator는 stud type의 유지 장치 중 하나로 널리 사용되어 왔으나 그 matrix는 탄성을 가지며 쉽게 마모되는 경향이 있어, 보철물 장착 후 빈번한 유지 관리가 필요하다. 이러한 문제점을 해결하기 위하여 새로운 유지 장치의 도입이 요구되었다. 본 증례에서는 새로운 ball type 유지 장치인 Air Gap attachment (AGA)를 이용한 피개의치로 수복한 증례를 보고하고자 한다. AGA는 금속으로 제작되어 다른 탄성 유지 장치에 비해 마모 저항성이 높다. 그럼에도 불구하고, 의치가 움직일 때 일정한 간극을 통해 움직임을 허용함으로써 stress breaker로의 역할이 가능하도록 하였다. 또한 기존에 식립된 임플란트와 자연치 모두 AGA와 연결이 용이하여 다른 unsplinted type의 유지 장치를 대체할 수 있다. AGA를 이용한 피개의치에서 기능, 심미 및 유지력의 면에서 만족할 만한 결과를 얻어 이를 보고하는 바이며, 장기간의 경과 관찰을 요한다.

• 대한치과보철학회지
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• 제31권4호
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• pp.565-579
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• 1993

This study was accomplished to analyse and compare the occlusal contact patterns during eccentric mandibular movements in adult with normal occlusion. 50 subjects(male 27, female 23), who had natural occlusion and no symptom of temporomandibular disorder, were selected. Teeth contact patterns during mandibular eccentric movements were recorded and the distribution of tooth contacts in maximum intercuspation analysed by T-scan system. And then, tooth contact numbers recored by T-scan and silicone bite registration at centric occlusion were analysed and compared. The results obtained were as follows : 1. Antero-posteriorly, the qualitative center of occlusal contacts in centric occlusion were in the first molar areas, but there was a slight deviation in left-right directions. Thus, distribution of occlusal contacts were not bilaterally symmetric. 2. During the mandibular movements from centric occlusal position to right lateral and left lateral directions, the frequency that maxillary canine joined in lateral guidance was relatively high, but pure canine protected occlusion or pure group function occlusion had small frequency. 3. During mandibular protrusive movement, one or more maxillary central incisors frequently joined in protrusive guidance. 4. During mandibular eccentric movements, working and balancing side premature contact was observered in relatively high frequency. 5. In centric occlusal position, the numbers of occlusal contacts recorded on T-scan were relatively smaller than on silicone bite registration.

• 대한치과보철학회지
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• 제40권5호
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• pp.493-506
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• 2002

Recently as the esthetic concerns about dental prosthesis have been increased, the nonmetallic post and core systems have been introduced clinically to improve the color and the low optical transmittance of conventional casting metal post and core systems. The purpose of this study was to compare and analyze the optical transmittance and the shade changes of all-ceramic crowns with two nonmetallic post and core systems. The experimental groups were classified as follows : Total 27 specimens(9 samples in each group) were evaluated. Group I : Natural teeth as a control group Group II : CosmoPost and $Empress^{(R)}$ core (Ivoclar-Vivadent, Liechtenstein) Group III : $LIGHT-POST^{TM}$ and $LIGHT-CORE^{TM}$ (Bisco, U.S.A.) In all group, all-ceramic crowns were fabricated with the same shade of IPS $Empress^{(R)}$ II (Ivoclar-Vivadent, Liechtenstein) after abutment preparation, and then two kinds of spectrophotometers, UV 3101 PC (Shimadzu, Japan) and CM 503i (Minolta Co. Ltd. Japan), were used to measure the optical transmittance and the color value. The following results were obtained : 1. The optical transmittance of each group without all-ceramic crowns, was siginificantly decreased in order of Group III, I and II (p<0.05). 2. The optical transmittance of each group with all-ceramic crowns cemented, were siginificantly decreased in order of Group I, II and III (p<0.05). 3. In comparison with the shade of all-ceramic crowns, there were no significant differences between groups regardless of the cementation. 4. In comparison with the shade changes in each group after the cementation of all-ceramic crowns, there were no significant differences between groups. From the above results, it is thought that the selection among materials used in this study doesn't influence greatly the esthetic restoration, because the differences of optical transmittance were so small that those were clinically insignificant.

• 대한치과보철학회지
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• 제26권1호
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• pp.51-61
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• 1988

The recently introduced castable glass ceramics incorporate properties characteristic of natural teeth and they are regarded as an ideal material to restore lost tooth structure. The purpose of this study was to compare the marginal fit of castable ceramic crown with that of the metal-ceramic crown in the process of heat treatment. Two master dies for castable ceramic crowns and metal-ceramic crowns were fabricated from being cast with the base metal. Each master die was duplicated with addition silicone and hard stone. Ten castable ceramic crowns were made on each hard stone die and their marginal openings were measured three times first, after casting; second, after ceramming; third, after shading. The other ten metal-ceramic crowns were made on each hard stone die and their marginal openings were measured three times : first, after casting; second, after degassing; third, after porcelain veneering. Each crown was seated on its master die with the constant force delivered by loading jig. And then, marginal openings were measured on four locations by optical projector at X50 magnification. The results were as follows: 1. The mean marginal openings of castable ceramic crowns were $31.1{\pm}12.7{\mu}m$ after casting; $44.6{\pm}12.8{\mu}m$ after ceramming; $51.2{\pm}16.8{\mu}m$ after shading. 2. The mean marginal openings of the metal-ceramic crowns were $26.2{\pm}13.8{\mu}m$ after casting; $29.8{\pm}10.3{\mu}m$ after degassing; $38.0{\pm}14.5{\mu}m$ after porcelain veneering. 3. There was significant increase in the marginal opening of castable ceramic crowns after ceramming, while metal-ceramic crowns sho(wed significant increase after porcelain veneering (p<0.05). 4. Marginal fit of metal-ceramic crown was better than that of castable ceramic crown (p<0.01).

• 구강회복응용과학지
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• 제17권4호
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• pp.231-244
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• 2001

This study was conducted to observe the effect on appendage muscle strength according to increase in occlusal vertical dimension. For this study, ten males with a mean age of 21 were selected. The subjects had a complete or almost complete set of natural teeth and reported no subjected symptoms of pain or dysfunction in the masticatory system. The tested occlusal splints were made at the position of increased occlusal vertical dimension of 2mm, 3.5mm, and 5mm from the ICP. Before and after wearing occlusal splints, the appendage muscle strength were tested by CybexII Dynamometer in each subject. The results were as follows : 1. When occlusal vertical dimension was increased, most of mean muscular strength values were increased except for those of supination and pronation of forearm at the position of 5mm increased occlusal vertical dimension. 2. The statistical analyses demonstrated that the increased occlusal vertical dimension position to be significantly stronger than intercuspal position for the muscle strength of the flexion and extension of hip, supination of forearm, external and internal rotation of knee, dorsiflexion and plantarflexion of ankle (p<0.05). 3. At the position of 3.5mm increased vertical dimension displayed the highest mean muscluar strength value than other positions. 4. Statistically demonstrated values, except for supination of forearm, internal rotation of shoulder, were related to lower appendage. Therefore splint was more effective on lower appendage than upper appendage to make muscle strength increased. 5. The mean increased rate of muscular strength tested on knee(57%), ankle(42%), and wrist(20%) were higher than hip(31%), elbow(14%), and shoulder(17%).

• 대한치과기공학회지
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• 제35권3호
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• pp.231-242
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• 2013

Purpose: The study is to discover the relationship between malocclusion, which is known to cause temporomandibular disorder, and temporomandibular disorder and is aimed at college students who have retained their natural teeth. Methods: The study was aimed at 500 college students at two colleges located in Gyeongsangbuk-do and Daegu metropolitan city and survey research was conducted in order to discover any relationship between malocclusion and temporomandibular disorder. After excluding copies with insincere answers or errors out of the 500 copies of the questionnaire, the study used a total of 435 copies (87%) for research and analysis. Results: Females showed a prevalence of temporomandibular joint clicking and temporomandibular joint pain, and students who had crowding showed a high prevalence of temporomandibular joint pain, temporomandibular joint clicking, and trismus. Students whose occlusal condition was not good demonstrated a high prevalence of temporomandibular joint pain, temporomandibular joint clicking, and trismus. Students who had maxillary protrusion showed a prevalence of temporomandibular joint clicking and trimus, whereas students who had mandibular protrusion showed a high prevalence of temporomandibular joint clicking. Conclusion: Students whose dental condition was crowding and students whose occlusal condition was not good exhibited a high prevalence of three types of symptoms of temporomandibular disorder. Meanwhile student who had maxillary protrusion showed a high prevalence of temporomandibular joint clicking and trismus, while students who had mandibular protrusion showed a prevalence of temporomandibular joint clicking.

• 대한소아치과학회지
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• 제25권4호
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• pp.731-748
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• 1998

The purpose of this study was to test the hypothesis that the more thorough cure of lightactivated composite resin could be obtained if a new way of delivering the light source deep through the resin body is developed when compared to the conventional bulk cure or incremental cure. Using cylindrical resin blocks and natural teeth, various curing conditions were tested for their effects on the degree of microleakage and microhardness. Data were analyzed statistically using One-Way ANOVA and Scheff's Multiple Range test. The results of the present study were as follows: 1. The increment of reduction in microhardness with depth was shown to be higher in group I and II than in group II and V. 2. At the level of lower inner surface and the bottom surface, significantly lower microhardness values were obtained in group I and II when compared to group III, IV and V. Group IV showed the lowest value among three groups(III, IV, V) representing the only statistically significant difference from group V(p<05). 3. Differences between groups in the degree of microleakage detected were shown to be statistically significant (p<05) with the exception of group IV and V at both occlusal and gingival margins. 4. Based upon the above-mentioned results, commonly cited recommendation of incremental curing is strongly supported and the light-transmitting wedge insertion method can be considered as a effective and feasible clinical procedure for the better curing of composite resin. However, more studies under a variety of conditions should be completed before this method is applied actually to the clinical setting.