• 제목/요약/키워드: 구강내 온도 변화

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The effect of temperature changes on force level of superelastic nickel-titanium archwires (온도 변화가 교정용 니켈-티타늄 호선의 하중값에 미치는 영향)

  • Chun, Kyoung-Ae;Kim, Kwang-Won;Lim, Sung-Hoon
    • The korean journal of orthodontics
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    • v.37 no.6
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    • pp.432-439
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    • 2007
  • The purpose of this study was to evaluate the influence of intraoral temperature changes on the orthodontic force level of a superelastic nickel-titanium alloy wire. Methods: Nickel-titanium archwires of $0.016"{\times}0.022"$ thickness were tested with a three point bending test setup, and temperature changes were applied. The force level changes according to temperature changes were measured at a 1.5 mm deflection during the loading phase and a 1.5 mm deflection during the unloading phase from a deflection to 3.1mm. Ten cycles of thermal cycling from baseline $(37^{\circ}C)$ to cold $(20^{\circ}C)$ or hot $(50^{\circ}C)$temperature were applied. Results: Alter thermal cycling, the force level during the loading phase decreased and the force level during the unloading phase increased even after the temperature was changed to the initial $37^{\circ}C$. Conclusions: The results suggest that the orthodontic force level can not return to the initial force level after temperature changes. When applying superelastic nickel-titanium archwires, we must consider that a lighter force than the loading force and a heavier force than the unloading force will be applied after intraoral temperature changes caused by eating and drinking.

치과용 인상재의 비교 응용

  • Kim, Cheol-Wi
    • The Journal of the Korean dental association
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    • v.24 no.3 s.202
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    • pp.199-203
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    • 1986
  • 치과용 인상재는 구강내에서 치아나 주위조직을 정확히 인기하여야 하며 조작이 간편하고 유동성이 충분하며 경화시간이 적당하고 값도 저렴해야 한다. 또 구강내에서 제거할 때 영구변형이나 파절되지 않는 충분한 강도와 크기의 정확성도 있어야 하며 자극이나 독성이 없고 인체에 안정성이 있고 모형재와 친화성이 있으며 보관중에도 변질해서는 안된다. 그러나 인상재는 서로 상이한 특성이 있고 장단점이 각각 다르므로 모든 조건에 일치하는 인상재는 거의 없다. 따라서 여러 인상재중에서 가장 적합한 인상재를 선택하는 것이 중요한 과정이다. 즉 인상재의 특성과 응용을 알고 선택할땐 보다 정밀한 모형을 얻을 수 있다. 기록에 의하면 18~19세기경에 최초로 인상용 왁스를 사용한 이래 19세기 중엽에 인상용 석고, 1925년에 agar, 1930년 ZOE, 1945년 앨지네이트, 1957년 실리콘, 1967년 polyether 및 1975년 부가중합형 실리콘이 사용되었으며 인상재가 유연성과 탄성이 있는가 경고하며 비탄성인가 또는 온도변화와 화학반응으로 경화되는 가에 따라서 ZOE paste, 인상용 석고, 인상용 왁스, 인상용 콤파운드, 수성콜로이드(agar, 앨지네이트), polysulfide, 실리콘(축중합형, 부가중합형) 및 polyether 인상재등 10여종으로 분류된다.

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Reliability of Infrared Thermographic Imaging in the Orofacial Region (구강안면부에서 적외선 체열검사의 신뢰도에 관한 연구)

  • Han, Dong-Joon;Kim, Ki-Suk
    • Journal of Oral Medicine and Pain
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    • v.26 no.4
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    • pp.355-367
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    • 2001
  • 치의학 분야에서 디지탈 근적외선 체열측정 장치(digital infrared thermographic imaging; DITI)의 응용이 미미한 것은 과거 열측정장치의 기술력이 부족한 것이 주된 요인이었다. 그러나 최근들어 기술이 진보함에 따라 실시간 열영상을 재현할 수 있게 되었고 이는 치의학 및 의학계에 많은 관심을 일으키고 있다. 지금까지의 연구를 보면 두개하악장애시 구강영역의 온도변화의 임상적 효용 가능성을 제시하였으나 안면 및 두경부에 대한 실제 기기 및 측정방법의 신뢰도에 대한 연구는 이루어지지 못한 상태이다. 본 연구에서는 DITI에 대한 신뢰도를 조사하였다. DITI의 모니터 상에서 비활동성 발통점의 부위를 찾아내기가 쉽지 않다. 따라서 모니터상에서 안면발통점(joint, temporalis anterior, masseter anterior, masseter inferior)의 부위를 찾아 온도를 찾아내는 방법과 미리 발통점 피부상에 링모양의 마크를 부착하여 모니터상에서 쉽게 찾아내는 방법을 사용하여 신뢰도를 조사하여 비교한 결과 다음과 같다. 1. 조사한 발통점 중에서 temporalis anterior, joint, masseter anterior과 masseter inferior의 순서로 피부온도가 유의하게 온도가 높았으나(p<0.05) masseter 내에서는 유의한 차이를 보여주지 않았다. 2. 4개의 발통점 모두에서 높은 열적 대칭성을 보였으며, 좌우 온도차이는 $0.1^{\circ}C$미만이었다. 3. 다른 시기에 조사한 조사자내 신뢰도는 두 조사자 모두 높은 상관관계를 보여주지 않았으며 대조군과 마크를 사용한 군간에는 뚜렷한 차이를 볼 수 없었다. 4. 동일한 시기에 조사한 조사자간 신뢰도는 두 시기 모두 joint 부위의 일부를 제외하고 높은 상관관계를 보여주었으며, 마크를 사용한 경우 사용하지 않은 경우 보다 훨씬 신뢰도가 높은 상관관계를 나타내었다. 이상의 결과로 보아 DITI는 두개하악장애환자에 대한 두경부 발통점의 온도변화를 측정하는 데 있어 시간에 따른 신뢰도는 결여되었으나 동일 시기의 측정에는 매우 유익할 것으로 사료되며, 특히 발통점에 대한 표시를 사용하는 경우 매우 정확한 온도를 조사할 수 있을 것으로 판단된다.

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The Characteristic of Temperature and Dose Distribution of intra oral X-ray Tube (강내형 X선 튜브 온도 및 선량 분포 특성)

  • Cho, Sungho;Lee, Rena
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.5
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    • pp.262-266
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    • 2013
  • A new concept of periapical radiography, intra oral x-ray tube and detector system is introduced. It is new system that a miniature x-ray tube is inserted into mouse and it acquired digital image using external detector. In this study, we have investigated temperature and dose distribution of insertional x-ray tube for periapical radiography. To analyze temperature characteristic of x-ray tube, we attached the thermocouple to surface of x-ray tube and we measured the temperature according to distance. Also, we measured the dose distribution of a miniature x-ray tube according to distance. As a result, temperature was constant to $27^{\circ}C$ over 2mm without cooling system, dose distribution of x-ray tube was 3.14 and 1.84mGy in 3 and 5cm, respectively. Therefore, the proposed x-ray system works in lower dose than conventional dental x-ray system. Thus, it is considered that new concept of system will have a significant effect on medical imaging technology.

Prosthetic rehabilitation in patient with soft palatal defect (연구개 결함을 가진 환자의 보철적 수복)

  • Chang, Myung-Woo;Kim, Jong-Jin;Piro, John D.;Wright, Robert F.
    • The Journal of Korean Academy of Prosthodontics
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    • v.37 no.1
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    • pp.134-138
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    • 1999
  • 연구개는 그 주위조직과 더불어 생리적 기능에 있어 음성, 연하, 및 호흡 등에 중요한 역할을 한다. 종양등의 이유로 인한 연구개의 외과적 절제는 그 해부학적 크기와 모양의 영구적인 변화로 인해 여러기능의 상실을 초래한다. 이에 따른 결함은 과도한 비음, 연하중 음식물이나 유동물의 비관으로의 누출 등을 들 수 있다. 연구개와 그 주위조직의 생리적인 기능의 숙지 및 이를 응용한 보철물(Palatopharyngeal Obturator)의 적절한 제작은 이러한 기능적 결함을 수복하는데 이용되어진다. 본 증례에서는 종양으로 인해 연구개를 절제한 환자의 보철적 수복에 있어, 구강내 온도에 따라 그 형상이 변화하는 인상재를 이용하여, 측-후 인두벽의 운동을 기능적으로 인기하는 방법을 이용하였다. 이러한 방법으로 제작된 보철물은 종양으로 인한 연구개의 절제 후 생리적인 기능의 장애를, 올바른 Palatopharyngeal 폐쇠를 유도함으로써 음질의 향상, 연하등의 기능을 회복시키는데 큰 도움이 될 수 있음을 보여준다.

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Change of fracture mode of orthodontic resin bracket wings under water immersion and thermocycling (침수 및 열순환에 따른 레진브라켓 wing의 파절강도 변화)

  • Son, Ji-Hyeong;Hwang, Hyeon-Shik
    • The korean journal of orthodontics
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    • v.30 no.4 s.81
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    • pp.475-481
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    • 2000
  • The purpose of this study was to evaluate the effect of oral environment on the strength of resin bracket wings by comparing fracture mode according to water immersion and thermocycling. Seventy-five resin brackets(Spirit MB, Ormco, California) were divided into three groups and treated for six months as follows; (1) untreated, (2) water immersion in distilled water at $37^{\circ}C$, (3) water immersion in distilled water at $37^{\circ}C$ with total 2,100 times of thermocycling taken 350 times each month. Fracture mode of the wing was tested on universal testing machine. In addition to resin brackets, 25 metal brackets were used as controls. Through the statistical analyses, following results were obtained. 1. Resin bracket wings showed significantly lower fracture strength than metal brackets(p<0.001). 2. Water immersion and water immersion with thermocycling groups showed significantly lower fracture strength than open air condition group(p<0.001). 3. Water immersion with thermocycling group showed significantly lower fracture strength than water immersion group(p<0.001). The above results suggest that the mechanical property of resin bracket wing nay be influenced by oral environment and further research is needed to improve the strength of the wing in the resin bracket.

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머캅탄류 검출을 위한 Thiobacillus thioparus가 생산하는 메칠머캅탄 산화효소의 분리 및 정제

  • Kim, Sang-Jun;Sin, Hyeon-Jae;Yang, Ji-Won
    • 한국생물공학회:학술대회논문집
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    • 2000.04a
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    • pp.485-488
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    • 2000
  • Methyl mercaptan oxidase was isolated and purified from Thiobacillus thioparus TK-m for the detection of mercaptans. The procedure of purification involved DEAE-Sephacel and Superose 12 column chromatographies with recovery yields of 47.5 and 48.5 %, and specific activity of 374 and 1240.8 units/mg-protein, respectively. The molecular weight of purified methyl mercaptan oxidase was determined to be 66.1 kDa by SDS-PAGE. Optimum temperature for activity was observed at $55\;^{circ}C$. This enzyme was activated by $(NH_4)_2SO_4$ and NaCl and inhibited by $NH_4Cl$.

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Clinical Characteristics of Patients with Taste Disorders (미각 장애 환자의 임상적 특성에 관한 연구)

  • Lee, Eun-Jin;Park, Won-Kyu;Nam, Jin-Woo;Yun, Jong-Il;Kho, Hong-Seop
    • Journal of Oral Medicine and Pain
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    • v.34 no.4
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    • pp.341-351
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    • 2009
  • There is tremendous variability in the ways patients present with taste problems. Because of complex and multifactorial etiological background, it is not simple to evaluate patients with taste disorders. Accurate assessment of patients' status by prudent, thorough history taking and symptom analysis is the most essential for exact diagnosis of taste disorders. The aim of this study was to investigate the clinical characteristics of patients with taste problems as a primary complaint. Consecutive series of 50 patients (12 males and 38 females, mean age $53.6\;{\pm}\;14.7$ years) were included for the present study. All subjects were requested to complete a comprehensive questionnaire. Clinical evaluation procedures included oral examination, interview, questionnaire analysis, panoramic radiography, blood test and measurement of salivary flow rate. The obtained results were as follows: 1. Among the patients, 36 patients (72%) complained of oral mucosal pain or burning sensation. Of these patients, 18 patients (36%) were diagnosed as burning mouth syndrome. 2. Nineteen patients (38%) complained of subjective oral dryness. The flow rate of unstimulated whole saliva was less than 0.1 mL/min in 14 patients (28%) and 17 (34%) had a stimulated whole salivary flow rate of less than 0.5 mL/min. 3. Among the types of taste disorders, hypogeusia, the most frequently reported, was found in 25 patients (50%), dysgeusia in 18 patients (36%), phantogeusia in 15 patients (30%), hypergeusia in 10 patients (20%), and ageusia in 5 patients (10%). Nineteen patients (38%) reported more than one type of taste disorder and the most frequent combination was dysgeusia + hypogeusia (n=6, 12%). 4. Based on data from the medical and dental histories and examinations, the patients were assigned to 12 probable causal categories. Taste disorders due to oral mucosal diseases and idiopathic taste disorder were the most frequent (n=9; 18%, each), followed by psychogenic taste disorder (n=8; 16%), drug-induced taste disorder (n=7; 14%), and taste disorder due to dry mouth (n=6; 12%). These 5 categories of taste disorder accounted for 78% of all cases in this study.

Effect of Pulse Energy and Pulse Repetition Rate at the Identical Total Power During Enamel Ablation Using an Er:YAG Laser (Er:YAG 레이저를 이용한 치아 삭제시 동일출력에서 펄스에너지와 조사반복률의 영향)

  • Won, Jung-Yeon;Kim, Mee-Eun;Kim, Ki-Suk
    • Journal of Oral Medicine and Pain
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    • v.31 no.3
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    • pp.223-229
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    • 2006
  • The objectives of this study was to investigate the amount of tooth ablation and the change of intrapulpal temperature by Er:YAG laser as it relates to pulse energy and pulse repetition rate at the identical power and, thereby, to reveal which of the two parameters strongly relates with ablation efficiency and intrapulpal temperature. Extracted healthy human molar teeth were sectioned into two pieces and each specimen was irradiated within the combination of pulse energy and pulse repetition time at the same power of 3W; $300mJy{\times}10Hz$ group, $200mJy{\times}15Hz$ group, and $150mJy{\times}20Hz$ group. Each specimen comprised ten tooth specimens. A laser beam with conjunction of a water flow rate of 1.6 ml/min was applied over enamel surfaces of the specimens during 3 seconds and the ablation amount was determined by difference in weight before and after irradiation. To investigate the temperature change in the pulp according to the above groups, another five extracted healthy human molar teeth were prepared. Each tooth was embedded into resin block and the temperature-measuring probes were kept on the irradiated and the opposite walls in the dental pulp during lasing. When the power was kept constant at 3W, ablation amount increased with pulse energy rather than pulse repetition rate (p=0.000). Although intrapulpal temperature increased with pulse repetition rate, there were no significant differences among the groups and between the irradiated and the opposite pulpal walls, except at a condition of $150y{\times}20Hz$ (p=0.033). Conclusively, it is suggested that ablation efficacy is influenced by pulse energy rather than pulse repetition rate.

Ablation Rate and Intrapulpal Temperature by Addition of Water Spray During Er:YAG Laser Irradiation (Er:YAG laser를 이용한 치아삭제시 물분사량이 삭제율과 치수내 온도변화에 미치는 영향)

  • Kim, Jung-Moon;Kim, Mee-Eun;Kim, Ki-Suk
    • Journal of Oral Medicine and Pain
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    • v.30 no.3
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    • pp.375-381
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    • 2005
  • Er:YAG laser has been considered a promising alternative to dental drill and many researches indicate that adjustment to variable parameters, including water flow rate, pulse energy and pulse repetition rate, can be made to improve ablation ability and efficiency of the laser. Of these parameters, addition of water spray during irradiation has been thought to ablate dental hard tissue more rapidly and safely. The purpose of this study was to investigate tooth ablation amount by Er:YAG laser irradiation as related to varied water flow rates added and, ultimately to find the most effective water flow rate for ablation. In addition, the temperature change of pulp chamber during irradiation was also monitored on the irradiated and opposite pulpal walls, respectively. An Er:YAG laser with contact mode was employed. Extracted human molars were split into two pieces for ablation experiment. Pulse energies of 200 and 300 mJ with a pulse repetition rate of 20 Hz and 5 water flow rates (1.6, 3.0, 5.0, 7.0, and 10.0 ml/min) were applied. Each irradiation was performed for 3 seconds. According to these parameters, experimental groups were divided into 10 subgroups which consisted of 5 specimens. For temperature experiment, another 5 tooth-specimens were prepared in the manner that pulp chamber was open through access cavity preparation and two temperature-measuring probes were placed respectively on the irradiated and the opposite walls of pulp chamber. From the experiment on ablation amount related to different water flow rates, it was shown that the least water flow rate of 1.6 ml/min ablated more than any other water flow rates (p<0.000). When the irradiation for 3 seconds, combined with the pulse repetition time of 20Hz and the water flow rate of 1.6 ml/min was done to tooth specimen, the temperature rise was not noticeable both on the irradiated and the opposite pulpal walls (less than 3$^{\circ}C$) and there was no significant difference in temperature rise between the two pulse energies, 200 and 300 mJ. From the results of this study, it is suggested that tooth ablation with Er:YAG laser can be done effectively and safely at a energy between 200 and 300 mJ/pulse and a pulse repetition rate of 20 Hz when the lasing is conjugated with the water flow rate of 1.6ml/min.