• 대한치과교정학회지
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• 제21권2호
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• pp.341-351
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• 1991

Dental maturity is one of the index of physiological maturity indicators. To investigate the relationship between dental maturity and chronological age, the author took the orthopantomograms of 984 students, aged 7 through 17 years, having normal occlusion. The orthopantomograms were examined and calcification degree of each tooth on the left side was rated according to the method described by Demirjian. On the basis of findings of this study, the following results were obtained. 1. The root completion periods of mandibular permanent teeth were as follows; Central Incisor M $8.32{\pm}1.03\;years$ F $7.96{\pm}1.04\;years$ Lateral Incisor M $9.40{\pm}1.30\;years$ F $9.01{\pm}0.90\;years$ Canine M $12.81{\pm}1.24\;years$ F $11.42{\pm}0.94\;years$ 1st Premolar M $12.76{\pm}1.74\;years$ F $12.19{\pm}1.33\;years$ 2nd Premolar M $13.31{\pm}1.88\;years$ F $12.88{\pm}1.49\;years$ 1st Molar M $9.60{\pm}1.69\;years$ F $9.30{\pm}1.16\;years$ 2nd Molar M $14.38{\pm}1.73\;years$ F $13.96{\pm}1.63\;years$ 2. Sexual differences in same age group at given calcification stage were not significant statistically. 3. The developmental order in mandibular permanent teeth was as follows; a) central incisor, b) lateral incisor, c) 1st molar, d) canine and 1st premolar, e) 2nd premolar, f) 2nd molar.

• Journal of Korean Neurosurgical Society
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• 제57권6호
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• pp.390-395
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• 2015

There have been a few studies reporting the epidemiology of moyamoya disease in Korea. Previous studies revealed relatively high prevalence and incidence of moyamoya disease in Korea and Japan. This study was designed to provide the latest epidemiologic information of moyamoya disease in Korea. We analyzed a database comprising of 50 million people covered in Korea by the National Health Insurance Service to calculate the prevalence. The incidence was estimated by eliminating the duplicated records of previous 3 years. We summarized the prevalence and incidence according to age, sex, and local distribution. In addition, the chronological changes were demonstrated with direct standardization using the 2010 population structure information. The standardized prevalence was 6.5 per 100000 persons in 2005, which was increased to 18.1 in 2013. In the same period, standardized incidence was increased from 2.7 to 4.3 per 100000 persons. The prevalence for men was 4.9 and 8.3 for women in 2005. In 2013, the prevalence had increased for men and women to 13.8 and 25.3, respectively. The incidence for men and women was 2.2 and 3.2, respectively, in 2005. It had increased to 3.5 and 5.7, respectively. The mean age of patients was 33.5 in 2005 and increased to 42.5 in 2013. The peak prevalent age group had shifted slightly to the older age groups, with chronologically consistent female predominance. The prevalence was highest in Jeollabuk province and lowest in Ulsan city.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제30권5호
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• pp.447-456
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• 2008

There is close relationship between intraoral structural anomaly and speech- functional problem. Patient with cleft palate patients & ankyloglossia is a typical example, patients with structural anomaly is repaired toward normal structure by operation. Ankyloglossia may cause functional limitation even after adequate surgical treatment speech disorders being one of them. Interindividually, they vary a lot, showing typical articulation specifics. The objective of this study was to evaluate and compare speech for children with ankyloglossia and general public, to determine whether ankyloglossia is associated with articulation problem. We wanted to present criteria for indication of frenectomy. The group of subject is composed of 10 childrens with ankyloglossia and articulation problem, visited the Oral and Maxillofacial surgical unit, dental hospital, Chonbuk university. The average age is 5 Y 7M, M : F ratio is 8 : 2 at the time of speech test. Control group is composed of 10 members without oral structural anomaly. The average age is 5 Y 10M, M : F ratio is 3 : 7 at the time of speech test. Outcomes were measured the PPVT(Peabody Picture Vocabulary Test), PCAT(Picture Consonant Articulation Test), Nasometer II test result obtained each group, statistically measured by Mann-whitney's U Test. There was no difference for 'chronological age-age equivalent' between two group. There was significant difference for 'consonant accuracy' between two group, showed more lower scores in subject group. There was more 'consonant error' in subject group, mostly showed/1/,/s/. A major modality of 'consonant error' was mostly distortion and replacement. There was no significant difference between two group for nasality.

• 대한치과교정학회지
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• 제49권6호
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• pp.360-371
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• 2019

Objective: We sought to determine the predictors of midpalatal suture expansion by miniscrew-assisted rapid palatal expansion (MARPE) in young adults. Methods: The following variables were selected as possible predictors: chronological age, palate length and depth, midpalatal suture maturation (MPSM) stage, midpalatal suture density (MPSD) ratio, the sella-nasion (SN)-mandibular plane (MP) angle as an indicator of the vertical skeletal pattern, and the point A-nasion-point B (ANB) angle for anteroposterior skeletal classification. For 31 patients (mean age, 22.52 years) who underwent MARPE treatment, palate length and depth, MPSM stage and MPSD ratio from the initial cone-beam computed tomography images, and the SN-MP angle and ANB angle from lateral cephalograms were assessed. The midpalatal suture opening ratio was calculated from the midpalatal suture opening width measured in periapical radiographs and the MARPE screw expansion. Statistical analyses of correlations were performed for the entire patient group of 31 subjects and subgroups categorized by sex, vertical skeletal pattern, and anteroposterior skeletal classification. Results: In the entire patient group, the midpalatal suture opening ratio showed statistically significant negative correlations with age, palate length, and MPSM stage (r = -0.506, -0.494, and -0.746, respectively, all p < 0.01). In subgroup analyses, a strong negative correlation was observed with the palate depth in the skeletal Class II subgroup (r = -0.900, p < 0.05). Conclusions: The findings of this study indicated that age, palate length, and MPSM stage can be predictors of midpalatal suture expansion by MARPE in young adults.

• Imaging Science in Dentistry
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• 제53권3호
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• pp.221-227
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• 2023

Purpose: This study was performed to develop a linear regression model using the pulp-to-tooth volume ratio (PTVR) ratio of the maxillary canine, assessed through cone-beam computed tomography (CBCT) images, to predict chronological age (CA) in Indonesian adults. Materials and Methods: A sample of 99 maxillary canines was collected from patients between 20 and 49.99 years old. These samples were obtained from CBCT scans taken at the Universitas Padjadjaran Dental Hospital in Indonesia between 2018 and 2022. Pulp volume (PV) and tooth volume (TV) were measured using ITK-SNAP, while PTVR was calculated from the PV/TV ratio. Using RStudio, a linear regression was performed to predict CA using PTVR. Additionally, correlation and observer agreement were assessed. Results: The PTVR method demonstrated excellent reproducibility, and a significant correlation was found between the PTVR of the maxillary canine and CA(r= -0.74, P<0.01). The linear regression analysis showed an R² of 0.58, a root mean square error of 5.85, and a mean absolute error of 4.31. Conclusion: Linear regression using the PTVR can be effectively applied to predict CA in Indonesian adults between 20 and 49.99 years of age. As models of this type can be population-specific, recalibration for each population is encouraged. Additionally, future research should explore the use of other teeth, such as molars.

• 대한한방소아과학회지
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• 제37권3호
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• pp.35-48
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• 2023

Objectives We aimed to analyze changes in growth indicators before and after Korean medicine treatment in patients treated at the pediatric department of a hospital. Methods We analyzed the medical records of children and adolescents under 18 years of age who underwent growth assessment between January 1, 2017 and December 31, 2022. Results A total of 21 patients were selected for this study. After treatment, there was a significant increase in the height percentile, whereas bone age-chronological age (BA-CA) and predicted adult height (PAH) did not show significant changes. No major adverse reactions were observed during the treatment. Growth reassessment was conducted twice for 10 participants. When comparing the growth indicators between the assessment sessions, the height percentile showed an increasing trend between the initial and the first growth reassessment. However, there were no significant differences between BA-CA and PAH across the different assessment periods. Conclusions There is a need to establish evidence for the efficacy and safety of continuous Korean medicine growth treatment through the long-term observation of growth indicators in patients undergoing treatment for two or more periods, as well as observational studies on liver and renal function indicators.

• 대한한방소아과학회지
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• 제37권2호
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• pp.1-11
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• 2023

Objectives We aimed to compare the bone age (BA) estimation by a deep learning-based program and by a specialist in pediatrics of Korean medicine using the Tanner-Whitehouse 3 (TW3) technique for the cases of children who visited a Korean medicine hospital for growth, and to report the effect of Korean medicine treatment. Methods For three children who visited the Korean medicine hospital for growth, BA estimation by the deep learning program and by the specialist in pediatrics of Korean medicine using the TW3 technique was compared, and the time required for estimation was investigated. The change of height, BA, and predicted adult height (PAH) using deep learning program after Korean medicine treatment was observed. Results BA estimation of the left hand bone X-ray by the specialist using the TW3 technique showed a difference of -0.03 to +0.15 years from the estimation by the deep learning program. The mean estimation time was 5 minutes and 49 seconds per one for the specialist and 48 seconds for the deep learning program. During the treatment period, the height percentile and PAH estimated by deep learning program were increased after Korean medicine treatment compared to baseline while acceleration of BA was suppressed compared to chronological age. Conclusions BA estimation using the deep learning program and the TW3 technique showed a difference of less than 0.15 years, and in three cases of patients with growth as the chief complaint, Korean medicine treatment increased height percentile and PAH without accelerating BA maturation.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제11권1호
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• pp.100-109
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• 2000

연구목적：본 연구는 발달 장애 아동들에 행해진 주간 발달 증진 프로그램의 효과 및 치료 결과에 대하여 고찰하고자 하였다. 방 법：발달 장애 아동들의 애착 형성을 향상시키고 부모-아동의 상호작용 증진을 통한 발달 촉진을 목적으로 국립서울정신병원 주간 치료실에서 1996년 이후 1년 단위로 3년간 시행된 치료 프로그램에 참석한 2세에서 7세의 발달 장애 아동(전반적 발달 장애-31명, 기타 발달 장애-18명) 49명을 대상으로 하였다. 정신과 전문의 2인 이상에 의하여 진단되었고 추적 진료 동안의 언어 치료사, 작업 치료사, 사회 사업가의 평가와 관찰, 간호사 관찰 및 보호자로부터의 정보를 통하여 진단적 신뢰도를 높였다. 이들에서 프로그램 참여 기간 동안의 교육 진단 검사(PEP), 아동기 자폐증 평정척도(CARS), 그리고 사회 성숙도 검사(SMS)상의 변화를 추적 조사하였고, 프로그램 참여시의 진단, 신체 연령 및 발달 연령, 동반 질환 등에 따라 분류하여 치료 효과를 비교하였다. 결 과：프로그램에 참여한 아동들은 PEP 종합 점수와 SMS 사회지수에서 통계적으로 유의한 진전을 보였다. 치료 시작시 발달 연령, 동반 질환, 그리고 CARS점수의 중증도에 따른 각 집단에서 치료 효과상의 유의한 차이는 없었다. 결 론：발달 장애 아동들을 위한 주간 치료실에서의 발달 증진 프로그램의 결과는 참여한 아동 모두에게 효과적이었다. 향후 동반 질환의 특성과 발달 연령에 맞는 특수 치료 프로그램 개발이 이루어져야 할 것이다.

• 한국콘텐츠학회논문지
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• 제10권5호
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• pp.285-295
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• 2010

소음에너지가 시작되는 주파수 즉, 선행 모음이 끝나는 지점을 절삭주파수라 한다. 본 연구는 구개파열아동과 정상 아동을 대상으로 마찰음과 파찰음의 절삭주파수 값, 후행모음에 따른 절삭주파수 값, 절삭주파수와 비음 치의 상관관계를 알아보고자 하였다. 연구의 대상은 서울 및 경기 지역에 거주하고 있는 아동으로 구개파열 진단을 받고, 생활연령이 6세 이상인 아동, 생활연령과 성별을 일치시킨 6세 이상 정상아동 각각 6명씩 총 12명이었다. 실험과제는 마찰음 및 파찰음의 무의미음절 환경과 문장 환경(50환경)으로 구성하였다. 구개파열 아동 집단은 정상 아동 집단에 비해 마찰음, 파찰음의 절삭주파수 값이 무의미음절 환경 및 문장 환경 모두에서 낮게 나타났다. 구개파열 아동과 정상 아동의 절삭주파수와 비음치 간 상관관계 연구 결과 정상 아동 집단에서는 무의미음절 환경과 문장 환경 모두에서 통계적으로 유의한 상관관계를 보이지 않았으나 구개파열 아동 집단에서는 문장 환경에서 통계적으로 유의한 상관관계를 보였다.

• 대한소아치과학회지
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• 제49권3호
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• pp.241-252
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• 2022

이 연구는 안장의 형태와 지연된 치령의 연관성을 알아보고자 수행되었다. 16세 미만 389명의 치령을 Demirjian 방법으로 평가하였고, 치령에서 연대 연령을 뺀 Age discrepancy (AD)를 계산하였다. 측방두부계측 방사선 사진 상 안장 형태에 따라 8가지로 분류하고 Sella turcica bridging (STB) 정도를 수치화하기 위해 Interclinoid distance를 안장의 길이로 나눈 Bridging ratio를 기준으로 4가지로 분류하였다. Kruskal Wallis 검정과 Mann Whitney 검정을 이용하여 8군과 4군에서 각각 AD의 유의성을 확인하였다. 일부 안장 형태 이상 군에서 정상보다 낮은 AD를 보였고 정상 안장 형태군과의 AD의 차이는 4 - 5개월에서 1년 3개월로 다양했다. STB 정도가 심해질수록, AD는 감소하였다. 정상 STB군과 경미한 STB군의 AD 차이는 7개월이고, 중등도 이상의 STB군에서는 1세 이상 치령이 지연되었다. 성별에 따른 안장 형태와 STB 정도는 유의한 차이가 없었다. 이 연구를 통해 일부 안장 형태 이상과 STB가 지연된 치령과 연관성이 있음을 확인하였다. 안장의 형태는 지연된 치령을 예측하는 보조적 수단으로 사용될 수 있다.