• 한국치위생학회지
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• 제15권4호
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• pp.649-659
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• 2015

Objectives: The purpose of the study is to investigate the musculo-skeletal pain prevalence and severity in the dental hygienists based on PRECEDE model. Methods: A self-reported questionnaire was completed by 483 dental hygienists in Gwangju from September 13 to October 12, 2013. Data were analyzed by frequency analysis, chi-square test, t-test, and multiple logistic regression analysis using SPSS 18.0 program. Musculo-skeletal pain severity was classified from 1 to 5 by PRECEDE model. The questionnaire consisted of six questions of the general characteristics of the subjects, one question of musculo-skeletal pain prevalence, one question of body part musculo-skeletal pain prevalence, one question of subjective health status, three questions of activities of daily living, six questions of working environment, one question of musculoskeletal system diseases knowledge, two questions of social support, two questions of education experience and data use method, and five questions of necessity of health education. Results: The prevalence rate of musculo-skeletal pain within a year was 83.9% and 22.8% of the dental hygienists complained of severe pain. The odds ratio of moderate pain severity was 1.99(95% CI, 1.10-3.60) and the odds ratio of unhealthiness was 3.27 (95% CI, 1.35-7.94). The odds ratio of pain severity in those working for 4-6 years was 0.21(95% CI, 0.08-0.57). The odds ratio of pain severity in those practicing 6-10 scaling cases per day was 0.33(95% CI, 0.17-0.65). The odds ratio of pain severity in wrist turning and bending was 3.56(95% CI, 1.19-10.62). Conclusions: The muscolu-skeletal pain severity in the dental hygienists was closely associated with subjective health condition, work duration, the number of scaling practice activity, and a treatment posture. Regular physical checkup for the dental hygienists will improve the musculo-skeletal pain due to scaling practice.

• 대한치과교정학회지
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• 제51권6호
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• pp.407-418
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• 2021

Objective: To investigate differences in the heritability of skeletodental characteristics between twin pairs with skeletal Class I and Class II malocclusions. Methods: Forty Korean adult twin pairs were divided into Class I (C-I) group (0° ≤ angle between point A, nasion, and point B [ANB]) ≤ 4°; mean age, 40.7 years) and Class II (C-II) group (ANB > 4°; mean age, 43.0 years). Each group comprised 14 monozygotic and 6 dizygotic twin pairs. Thirty-three cephalometric variables were measured using lateral cephalograms and were categorized as the anteroposterior, vertical, dental, mandible, and cranial base characteristics. The ACE model was used to calculate heritability (A > 0.7, high heritability). Thereafter, principal component analysis (PCA) was performed. Results: Twin pairs in C-I group exhibited high heritability values in the facial anteroposterior characteristics, inclination of the maxillary and mandibular incisors, mandibular body length, and cranial base angles. Twin pairs in C-II group showed high heritability values in vertical facial height, ramus height, effective mandibular length, and cranial base length. PCA extracted eight components with 88.3% in the C-I group and seven components with 91.0% cumulative explanation in the C-II group. Conclusions: Differences in the heritability of skeletodental characteristics between twin pairs with skeletal Class I and II malocclusions might provide valuable information for growth prediction and treatment planning.

• 한국치위생학회지
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• 제15권2호
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• pp.205-216
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• 2015

Objectives: The purpose of the study is to investigate the psychological state of the patients according to skeletal class III malocclusion symptoms. Methods: The subjects were 200 skeletal class III malocclusion patients. The questionnaire consisted of general characteristics, clinical manifestation, and T score of Korean version of self-rated Symptom Checklist-90-Revision modified by Jae-hwan Kim. The data were analyzed using SAS version 9.2 and t-test, ANOVA, and ANCOVA were used. Clinical manifestation included subjective recognition and radiological analysis. The subjective recognition of the patients consisted of self-satisfaction of the appearance, phonation, mastication, and temporomandibular joint pain. T score consisted of somatization, obsessive-compulsive, interpersonal sensitivity, depression, anxiety, hostility, phobic anxiety, paranoid ideation, and psychoticism. Results: The most serious factor in 9 scales was the severe TMJ pain by ANCOVA. Male patients had a higher T score in phobic anxiety, psyochoticism, somatization and depression than female patients. Those having low appearance satisfaction had the problem in interpersonal sensitivity. Obsessive-compulsive symptoms were conspicuous in phonation difficulty and temporomandibular pain. Conclusions: The patients with skeletal class III malocclusion have more satisfaction with appearance, pronunciation, and phonation than those with skeletal class III malocclusion and overjet. Proper dental treatment will improve the communication and quality of life.

• 대한소아치과학회지
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• 제49권2호
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• pp.234-240
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• 2022

Floating Harbor 증후군 (FHS)은 드문 유전질환이다. 본 증례는 FHS를 가진 환아에 대해 소개하였다. 환아는 독특한 얼굴 형태, 저성장된 상악과 전돌된 하악을 동반한 심한 골격적 3급 부정교합, 결손치, 왜소치, 상악 치아의 이소맹출을 보였다. 쌍둥이 여동생은 하악 전돌을 동반한 경미한 골격성 3급 부정교합은 보였으나 결손치와 왜소치는 보이지 않았다. 높은 구개궁, 넓은 난형의 하악궁에 비해 좁은 V형의 상악궁, 역의 관계의 상하악 구치간 폭경으로 인한 구치부 반대교합이 환자의 모델 분석을 통해 확인되었다. 이러한 특성은 쌍둥이에서는 나타나지 않았다. 행동면에서 환아는 경미한 정신지체로 인해 치과 치료 중 낮은 협조도를 보였다.

• Journal of Dental Anesthesia and Pain Medicine
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• 제15권3호
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• pp.113-119
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• 2015

Background: The inferior alveolar nerve block (IANB) is the most common anesthetic techniques in dentistry; however, its success rate is low. The purpose of this study was to determine the correlation between IANB failure and mandibular skeletal characteristics Methods: In total, 693 cases of lower third molar extraction (n = 575 patients) were examined in this study. The ratio of the condylar and coronoid distances from the mandibular foramen (condyle-coronoid ratio [CC ratio]) was calculated, and the mandibular skeleton was then classified as normal, retrognathic, or prognathic. The correlation between IANB failure and sex, treatment side, and the CC ratio was assessed. Results: The IANB failure rates for normal, retrognathic, and prognathic mandibles were 7.3%, 14.5%, and 9.5%, respectively, and the failure rate was highest among those with a CC ratio < 0.8 (severe retrognathic mandible). The failure rate was significantly higher in the retrognathic group than in normal group (P = 0.019), and there was no statistically significant difference between the other two groups. Conclusions: IANB failure could be attributable, in part, to the skeletal characteristics of the mandible. In addition, the failure rate was found to be significantly higher in the retrognathic group.

• 대한소아치과학회지
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• 제49권4호
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• pp.514-514
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• 2022

• 대한소아치과학회지
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• 제37권3호
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• pp.359-366
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• 2010

전치부 교환기의 반대교합 아동에서는 골격적 특성이 강할수록 상하 치아의 성숙도에 현격한 차이가 있음을 쉽게 관찰할수 있다. 파노라마 방사선 사진으로 평가가 가능한 상하 치령의 차이가 III급 부정교합의 조기 징후로 개연성이 있다면, 이것은 조기 감별진단의 한 도구로써 가치가 있을 것으로 판단되었다. 부산대학교치과병원 소아치과에 내원한 Hellman 치령 IIA, IIC의 환자를 대상으로, 측두방사선사진, 파노라마 방사선사진, 석고 모형과 임상사진을 조사하여 정상교합군과 전치부 반대교합군 각 50명을 선택하였다. 이들의 파노라마 방사선사진을 이용하여 Demirjian법으로 각 군의 상하 치령 및 제1대구치 맹출율을 구하고 그 차이를 비교, 분석하여 다음과 같은 결과를 얻었다. 1. 정상교합군과 반대교합군 모두에서 역령에 비해 치령이 높게 나타났으며 성차는 보이지 않았다(p>0.05). 2. 정상교합군과 반대교합군의 상하 치령의 차이는 각각 0.22세와 0.69세로 반대교합군에서 더 큰 차이를 보였다(p<0.05). 3. 정상교합군에 비해 반대교합군에서 상하 제1대구치 맹출율의 차이가 크게 나타났다(p<0.05).

• 대한치과교정학회지
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• 제48권3호
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• pp.143-152
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• 2018

Objective: This study examined cone-beam computed tomography (CBCT)-derived multiplanar-reconstructed (MPR) cross-sections to clarify the salient characteristics of patients with skeletal class III malocclusion with midface deficiency (MD). Methods: The horizontal and sagittal plane intersection points were identified for middle-third facial analysis in 40 patients in the MD or normal (N) groups. MPR images acquired parallel to each horizontal plane were used for length and angular measurements. Results: A comparison of the MD and N groups revealed significant differences in the zygoma prominence among female patients. The convex zygomatic area in the N group was larger than that in the MD group, and the inferior part of the midface in the N group was smaller than that in the MD group for both male and female patients. A significant difference was observed in the concave middle maxillary area among male patients. Conclusions: This study was conducted to demonstrate the difference between MD and normal face through MPR images derived from CBCT. Male patients in the MD group had a more flattened face than did those in the N group. Female patients in the MD group showed a concave-shaped lower section of the zygoma, which tended to have more severe MD. These findings indicate that orthognathic surgery to improve skeletal discrepancy requires different approaches in male and female patients.

• 대한치과교정학회지
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• 제38권5호
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• pp.358-370
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• 2008

골격성 III급 부정교합자는 교정치료와 악교정 수술을 병행하여 치료하는 경우가 많아 골격형태에 대한 정확한 파악과 이해가 필수적이다. 이에 본 연구는 골격성 III급 부정교합자와 정상교합자 간의 골격 형태의 차이를 밝히고자 시행되었다. 실험군으로는 단국대학교 교정과에서 골격성 III급 부정교합으로 진단되어 술 전 교정치료를 받기로 예정된 총 20명을 선정하였고, 대조군으로는 골격성 I급 정상교합군으로 I급 교합관계를 보이며, 교정치료와 보철치료의 경험이 없는 정상 교합자 10명을 선정하여 CT촬영을 시행한 후 3차원 입체영상을 제작, 분석하여 상, 하악 기저골을 횡적으로 비교하여 다음과 같은 결론을 얻었다. 골격성 III급 부정교합자군의 특징을 살펴보면, 상악 기저골의 폭경이 유의성 있게 더 작았고, A point에서 ANS로 갈수록 제1소구치 부위에서 유의하게 폭이 감소하였으며, 제2소구치 부위에서 폭의 증가량이 유의하게 작았다. 하악 기저골은 B point, Antegonion 기준 횡단면에서 견치, 제1소구치 부위의 폭경이 유의성 있게 크게 나타났다. 상하악의 비교 시, 실험군의 견치부, 제1소구치부, 제2소구치부에서 하악에 비해 상악의 폭경이 유의성 있게 작음을 보였다.

• 대한치과교정학회지
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• 제50권3호
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• pp.181-187
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• 2020

Objective: This study aimed to evaluate the differences in cephalometric characteristics and skeletal maturation in girls with central precocious puberty (CPP) via lateral and hand-wrist radiographs. We also aimed to identify the indicators that are most effective for determining skeletal maturity in these patients. Methods: The study included 70 Korean girls (mean age, 8.5 ± 0.5 years) diagnosed with CPP at the Department of Pediatrics, and 48 normal healthy age-matched girls who visited the Department of Orthodontics and had no history of hormone treatment or growth problems. Skeletal maturation was evaluated using lateral cephalometric and hand-wrist radiographs using cervical vertebrae maturation indicators (CVMI) and skeletal maturity indicators (SMI). Results: The mean mandibular plane angle was smaller in the CPP group than in the control group (35.8° ± 4.9° vs. 39.0° ± 6.5°), resulting in greater posterior facial height (p = 0.003). SMI was significantly greater in the CPP group (3.5 ± 1.4 vs. 2.0 ± 1.0) than in the control group (p = 0.001) and was significantly associated with CPP (r = 0.492; p = 0.001), whereas CVMI was not. Conclusions: In comparison with the control group, the CPP group exhibited a smaller mandibular plane angle, greater posterior facial height, and greater skeletal maturation. SMI may be more suitable than CVMI for determining skeletal maturation in CPP. Hand-wrist radiography is recommended in addition to lateral cephalogram for predicting growth in girls with CPP.