• Journal of Korean Dental Science
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• 제16권2호
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• pp.192-203
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• 2023

Purpose: This study is to investigate the distribution of natural tooth shades in the Korean elderly population to quantify the correlation and changes of tooth color with age and gender. In addition, the possible effects of habits on tooth color were assessed. Materials and Methods: The tooth color of one of the maxillary central incisors of 200 Korean individuals aged 50 to 89 years, males and female, was measured using the portable intraoral spectrophotometer (VITA Easyshade V). CIELab and CIELCh color coordinates were recorded. We conducted the survey about the tobacco smoking, chronic disease, medication, eating habits, oral health behaviors and satisfaction with tooth color. Experimental data were statistically analyzed by using the t-test (P<0.05), two-way analysis of variance and Pearson's correlation test. Result: The most frequent color in the Korean elderly population was 3M3 & A3.5 shade. L^* and h^* values decreased, whereas C^*, a^* and b^* values increased progressively with age. There was a significant interaction between age and color coordinates for b^* values (r=0.245, P<0.05). Males generally have significantly higher C^*, a^*, b^* values and lower L^*, h^* value compared to females. Individuals who consumed alcohol had a higher L^* value (P<0.05). Conclusion: Within the limitation of this study, the central incisors were getting darker, more reddish, and yellowish with age. Information on the chromatic range of natural teeth by age and gender could help to select colors for esthetic dental restorations.

• 대한치과교정학회지
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• 제16권1호
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• pp.155-165
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• 1986

Recently, straight-wire appliance is widely used with great concern in clinical orthodontic field. The purpose of this study was to collect the information of the straight-wire appliance and to determine the crown inclination in clinical orthodontics. The author analyzed the study model of 78 individuals with normal occlusion. The obtained results were as follows. 1. Mean, maximum value, minimum value and standard deviation of crown inclination of upper and lower teeth were obtained. 2. The lingual crown inclination of upper tooth had constant value from first premolar through second molar, the lingual crown inclination of lower tooth progressively increased from canine through second molar. 3. As Howes' ratio was decreased, the crown inclination of upper incisors was increased. 4. Narrowing the upper arch, the crown inclination of upper incisors was increased.

• 척추신경추나의학회지
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• 제10권1호
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• pp.87-95
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• 2015

Background : Charcot Marie Tooth disease can cause muscle weakness and foot deformity. Ankle pain induced by foot deformity affect patients' gait pattern and quality of life. Objectives : The purpose of this study is to evaluate the traditional Korean medicine treatment for ankle pain induced with Charcot-Marie Tooth Disease, especially Chuna manual therapy on ankle joints. Methods : One patient was treated with acupuncture, phamacopuncture, herbal medication and chuna manual therapy on ankle joints. To evaluate the pain of ankle, lower back and lower extremity, visual analog scale(VAS) was measured. Results : After treatment for 5 week, the pain of ankle joint was declined from VAS 6 to VAS 2. Conclusions : Traditional Korean medicine treatment including acupuncture, pharmacopuncture, herbal medication and Chuna manual therapy is effective for ankle pain with foot deformity. But further studies are required to prove the effectiveness of Chuna manual therapy on ankle joints.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.425-428
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• 2000

In this paper the impact force which occurs on each tooth of jaw-bones while masticating is calculated through the rigid body dynamic analysis. This analysis is done by ADAMS. The impact force calculated in this paper is required for the structural stress analysis of implant system which is needed for the implant system design. The analysis results show that the impact time decreases as the impact force increases, the largest impact force occurs on the front tooth and the impact force is almost normal to the tooth surface together with slight tangential force.

• 대한치과의사협회지
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• 제44권2호통권441호
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• pp.123-132
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• 2006

Patients who have impacted tooth are found commonly in orthodontic treatment. Although it is difficult to find the cause of impacted teeth, the most common, causes are prolonged retention of the deciduous teeth, trauma, aberrant sequence of eruption, lack of space and deficiency of Vitamin D. Impacted teeth may lead to esthetic and functional problems and root resorption of adjacent teeth, so we should treat it as soon as possible. Commonly used treatment method is the following: After surgically uncovering of the impacted teeth, a bond of orthodontic appliance is established, and orthodontic traction is started with a removable or fixed appliance. We used the modified lingual arch with a soldered auxiliary appliance in lingual arch for traction of lower impacted teeth. The modified lingual arch could control the magnitude and direction of the applied force with one-arch treatment, and also could give continuous force to impacted tooth without patient patient cooperation. We achieved good results with the modified lingual arch.

• 대한치과의사협회지
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• 제11권4호
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• pp.277-280
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• 1973

The author observed the changes of dental arch dimensions and compared spae-maintainer group with non-space-maintainer group after primary tooth extraction. The results were as follows 1) The rate of growth of dental arch of expeirmental group in intercanine width and in inter-1st molar width was more rapid than that of the control group. 2) Arch length is almost no dimensions but it was slightly decreased in lower arch. 3) Dental arch growth and tooth eruption were stimulated by space-maintainer appliance, so it is the best way to replace a new appliance at least once a year. 4) It is thought that satisfactory conclusions in this observation must be researched successively until the mixed dentition completes.

• Journal of Genetic Medicine
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• 제15권2호
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• pp.107-109
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• 2018

X-linked Charcot-Marie-Tooth disease type 1 (CMTX1) is caused by the mutation in GJB1 gene, characterized by the transient central nervous system involvement and long standing peripheral polyneuropathy which does not fulfill the criteria of demyelination or axonopathy. We describe a 37-year-old man with progressive bilateral leg weakness since his early teen. He suffered transient right hemiparesis, followed by quadriparesis at 14 years of age. When we examined him at 37 years of age, he presented a distal muscle weakness on lower extremities with a sensory symptom. The nerve conduction study demonstrated a motor conduction velocity between 26 and 49 m/s. The whole exome sequencing revealed a novel variant c.136 G>A in GJB1. This report will raise awareness in this rare disease, which is frequently misdiagnosed early in its course.

• Annals of Clinical Neurophysiology
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• 제21권1호
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• pp.57-60
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• 2019

Axonal Charcot-Marie-Tooth disease (CMT2) has most frequently been associated with mutations in the MFN2 gene. MFN2 encodes mitofusin 2, which is a mitochondrial fusion protein that plays an essential role in mitochondrial function. We report CMT2 in a Korean father and his son that manifested with gait difficulties and progressive atrophy of the lower legs. Molecular analysis revealed a novel heterozygous c.2096T>C (p.Leu699Pro) mutation in the exon 18 of MFN2 in both subjects. We suggest that this novel mutation in MFN2 is probably a pathogenic mutation for CMT2.

• 대한치과교정학회지
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• 제29권5호
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• pp.563-573
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• 1999

본 연구는 치아크기 측정시 버니어 캘리퍼스를 사용한 계측치와 석고모형을 촬영하여 컴퓨터를 사용한 계측치를 서로 비교함으로써 석고모형 분석시 컴퓨터 이용 가능성을 알아보고자 시행되었다. 치아밀집치열 특징을 지니며 모든 치아의 맹출이 완료된 상하악 20조의 석고 모형의 좌측 중절치부터 제 1대구치까지 12개의 치아를 대상으로 하여, 각 치아의 근원심폭경을 버니어 캘리퍼스와 컴퓨터를 이용하여 2주 간격으로 2회 측정하여 실험측정치를 얻은 다음, 측정에 이용된 석고모형을 근원심접촉점 부위에서 개개치아로 분리한 후, 마이크로미터를 이용하여 측정한 표준치와 비교분석하였다. 계측시 오차의 원인을 알아보기 위하여 상하악의 occlusogram을 얻어 각 치아의 접촉점 이탈유무 및 정도를 구하고, TARG (Torque Angulation Reference Guide)를 이용하여 각 치아의 근원심경사도를 계측한 결과 다음과 같은 결론을 얻었다. 1. 2회 측정에 대한 재현도 비교시 버니어 캘리퍼스를 사용한 경우 12 개 치아 중 3개의 치아에서 유의한 차이가 나타났으며 컴퓨터의 경우에는 1 개의 치아에서 차이가 나타났다. 2. 치아크기 계측의 정확도를 알아보기 위하여 표준치와 비교한 결과, 버니어 캘리퍼스를 사용한 경우 12개 중 3개의 치아에서 유의한 차이가 있었으며 컴퓨터의 경우에는 12 개 중 2 개의 치아에서 차이가 나타났다. 3. 버니어 캘리퍼스를 사용한 경우 상악 제 1 대구치는 표준치에 비해 크게, 하악 제 1 대구치는 표준치에 비해 작게 재는 경향을 보였으며 컴퓨터의 경우 상하 제 1 대구치 모두 표준치에 비해 크게 재는 경향을 보였다. 4. 버니어 캘리퍼스로 계측시에는 하악 제 1 대구치가 가장 큰 오차를 보였으며 치아별로 오차정도가 다양하게 나타난 반면, 컴퓨터의 경우 치아별 오차정도의 차이를 보이지 않았다. 5. 접촉점 이탈정도 및 치관의 근원심 경사도와 오차정도의 상관성을 살펴본 결과 버니어 캘리퍼스로 측정한 경우 유의한 상관관계를 보이지 않았으나 컴퓨터로 계측한 경우 약한 순상관관계를 보였다. 이상의 결과는 모형분석을 위한 치아크기 계측시 컴퓨터 이용이 가능함을 시사하였다.

• 한국산학기술학회논문지
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• 제12권11호
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• pp.4959-4967
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• 2011

본 연구는 근로자들을 대상으로 구강건강상태 및 관련요인을 파악하여 구강건강증진을 향상시키기 위하여 경상남도지역 일부 근로자 178명을 대상으로 자기기입식 설문지를 작성하게 하여 다음과 같은 결론을 얻었다. 치아우식증이 있는 군에서 지난 1년간 치과방문경험이 있거나 치석제거경험이 있다고 응답한자에서 치아우식증이 없는 군보다 낮게 나타나 유의한 차이가 있었다(p<.05). 치아우식증이 있는 군에서 치아가 쑤시거나 욱신거리며 아픈 경험이 있다고 응답한 자가 51.3%, 잇몸이 아프거나 피가 난 경험이 있다 48.7%, 불쾌한 입냄새 경험이 있다 53.8%로 나타나 유의한 차이가 있었다(p<.05). 치은염증이 있는 군에서 지난 1년간 치석제거경험이 없거나 치은염증이 없는 군보다 낮게 나타났다(p<.001). 치은염증이 있는 군에서 하루 칫솔질 회수는 3회이상이 9.6%, 취침전 칫솔질을 항상 했다 4.7%, 구강위생보조용품 이용은 대부분 했다 5.9%로 나타나 유의한 차이가 있었다(p<.001) 치아우식증 유무에 영향을 미치는 변수로는 주관적 구강증상, 치실 또는 치간칫솔 사용여부, 구취증상 변인으로 파악되었고, 치은 염증 유무에 영향을 미치는 변수로는 취침직후 칫솔질 유무, 혀통증 증상, 구취증상, 시린치아증상, 스켈링경험여부 변인으로 파악되었다. 이상 구강검진을 통한 상담과 교육을 통해 근로자들의 구강건강에 대한 의식을 고취시켜 근로자들의 구강건강을 증진 유지시키는데 도움이 되는 방향으로 개선되어야 될 것이다.