• Imaging Science in Dentistry
• /
• 제48권4호
• /
• pp.261-268
• /
• 2018

Purpose: To determine the impact of an image processing technique on diagnostic accuracy of digital panoramic radiographs for the assessment of anatomical structures in paediatric patients with mixed dentition. Materials and Methods: The study consisted of 50 digital panoramic radiographs of children aged from 6 to 12 years, which were later on processed using a dedicated image processing method. A modified clinical image quality evaluation chart was used to evaluate the diagnostic accuracy of anatomical structures in maxillary and mandibular anterior and maxillary premolar region of processed images. Results: A statistically significant difference was observed between pre and post-processed evaluation of anatomical structures(P<0.05) in the maxillary and mandibular anterior region. The anterior region was found to be more accurate in post-processed images. No significant difference was observed in the maxillary premolar region (P>0.05). The Inter-observer and intra-observer reliability of both pre and post processed images were excellent (>0.82) for anterior region and good (>0.63) for premolar region. Conclusion: The application of image processing technique in digital panoramic radiography can be considered a reliable method for improving the quality of anatomical structures in paediatric patients with mixed dentition.

• 대한소아치과학회지
• /
• 제24권4호
• /
• pp.735-742
• /
• 1997

Class II malocclusion can be treated via early orthopedic, orthodontic treatment or orthognathic surgery with orthodontic treatment. In the mixed dentition, early orthopedic treatment can be used. Especially, in the case of mandibular retrognathism, the functional appliances can be used, and in the case of maxillary protrusion is combined, they can be used together with headgear. After using activator and activator combined with headgear to the class II malocclusion paitent in the mixed dentition, the results were as follows: 1. Lateral profile was improved, and lower face height was increaed. 2. Overjet was decreased, and molar relationship was changed to class I molar relationship. 3. Growth can be undisturbed, and the aggravation of malocclusion can be prevented to make the 2nd phase orthodontic treatment be much easier.

• 대한소아치과학회지
• /
• 제24권4호
• /
• pp.758-762
• /
• 1997

There are various types of localized tooth malpositions in the mixed dentition, such as abnormal tooth axis, anterior crossbite of some incisors, impaction, midline diastema, ectopic eruption, and so forth. We, Pediatric Dentists, have usually used removable appliances for these instances. But, removable orthodontic appliances, as is known, have marked limitations in some situations, for example, severe rotation, intrusion and extrusion, root torque, closure of large diastema, traction of impacted tooth, etc. In such cases, Whip spring, combined with fixed or removable appliance, can increase utilities of removable orthodontic appliances. The authors have applied whip springs to some cases showing localized positional and arrangement problems, and have witnessed the results as follows; 1. The refined and elaborate control of direction and magnitude of force by the operator, and accurate compliance of the patients were requisite for the treatment with it. 2. It showed special effectiveness for de rotation of incisors. Although it yields some benefit for root movement, the special consideration for incomplete roots in this age bracket was required. 3. In the localized malalignment cases in mixed dentition, uncurable with traditional removable appliances but practically unrealistic with fixed appliance therapy, the whip spring was thought to be a good alternative.

• 대한소아치과학회지
• /
• 제49권3호
• /
• pp.329-339
• /
• 2022

이 연구의 목적은 혼합치열기의 골격성 I, II, Ⅲ급 부정교합의 구개용적, 폭경, 장경, 고경을 비교하는 것이다. 이 연구는 단국대학교 치과대학병원 소아치과에 내원하여 교정을 목적으로 인상채득한 진단모형 1400개 중 30개를 선별하여 분석하였다. 모형은 Hellman's dental age ⅢA의 골격성 I, II, Ⅲ급 부정교합으로 구성되었다. 3차원 스캐너로 모형을 스캔한 후 여러 구개 수치들을 측정하였다. SPSS에서 Kruskal-Wallis test를 이용하여 비교 분석하였고, Mann-Whitney test로 사후검정하였다. 혼합치열기의 II급 부정교합에서 I급, Ⅲ급 부정교합에 비해 구개폭경이 유의하게 작았고, 구개장경이 유의하게 길었다. 혼합치열기의 Ⅲ급 부정교합에서 구개고경이 유의하게 가장 컸으며, 그 다음으로는 II급, I급 순이었다. 구개용적은 Ⅲ급, II급, I급 순으로 컸으나, 통계적으로 유의할 만한 차이는 보이지 않았다. 각 교합 양식에 따른 구개 형태의 차이를 이해하는 것은 임상적으로 매우 중요하다. 이 번 연구를 바탕으로 구개의 형태와 골격 패턴과의 관계에 대해 이해하였고, 이는 교정 치료 계획, 부정교합 조기 진단 및 구개 형태의 통합 메커니즘을 이해하는 데에 유용한 정보를 제공한다.

• 대한치과교정학회지
• /
• 제23권1호
• /
• pp.57-74
• /
• 1993

Anterior crossbite is a common malocclusion in the early deciduous dentition. Even today, many these malocclusion patients are not treated until the mixed or permanent dentition. And the purpose here is to emphasize the need for early diagnosis and possible treatment for these anterior crossbite malocclusions and their associated facial patterns. Case histories of 4 patients selected from the author's practice are presented. Different methods of treatment are evaluated. Some improvement was achieved in all patients from an early interceptive regimen, although ultimately corrective orthodontic treatment may still be needed in some. It is concluded that early interception of deciduous anterior crossbite malocclusion should by attempted in patients ; there should be no delemma in reaching such a decision. And it is essential for diagnosis and treatment to determine exact variations in growth when some appliance are used, it is recommended that growth-related records be made as early as possible.

• 대한치과교정학회:학술대회논문집
• /
• 대한치과교정학회 2003년도 제36회 학술대회
• /
• pp.30.2-31
• /
• 2003

• 대한소아치과학회지
• /
• 제32권1호
• /
• pp.101-108
• /
• 2005

혼합 치열기에서 유치의 탈락 및 영구치의 맹출 과정이 순조롭게 이루어지는 것은 중요한 일이다. 맹출 중인 치아는 인접치 유무, 유치의 흡수속도, 유치의 조기상실, 만기잔존, 국소병소나 입술, 혀, 저작근 등의 다양한 요인들에 의해 영향 받을 수 있으며, 이러한 요소들 사이의 균형이 깨지게 되면 인접치 간의 관계가 변하고 심각한 부정교합이 초래될 수 있다. 본 증례는 유치열 및 혼합치열을 가진 어린이들에서 상하악 구치부 교합면에 접착된 교합 거상 금속 스플린트(bite raising metal splint)가 치열에 미친 영향에 대해 보여주고 있다. 이들은 스플린트로 인한 유치의 만기잔존으로 영구치 맹출에 방해를 받거나, 전치부 개방교합, 제 1대구치의 저위 맹출 등 혼합 치열기 발달에 큰 영향을 받고 있었다. 치료로써 고속 핸드피스를 이용하여 스플린트를 제거하고 주기적 점검을 통해 교합변화 및 영구치 맹출 양상을 관찰하였다.

• 대한소아치과학회지
• /
• 제34권1호
• /
• pp.169-178
• /
• 2007

혼합치열기에 있어서 가장 흔히 나타나는 부정교합의 한 유형으로 총생 문제를 들 수 있다. 총생은 그 심한 정도에 따라서 정상적인 치열 발육 과정에서 일시적으로 나타나는 경우도 있으며 치열공간과 치아 크기간의 부조화에 의해서 비정상적으로 나타나는 경우도 있다. 따라서 총생에 대한 관리를 적절하게 하기 위해서는 정상적인 치열 발육 과정에 대한 이해가 선행되어야 한다. 본 종설에서는 정상적인 치열 발육 과정 및 총생의 심한 정도나 위치에 따른 일반적인 접근 방법에 대하여 알아보고자 하였다. 영구치가 맹출되는 시기는 개인 마다 다를 뿐만 아니라 맹출 순서에 있어서도 개인적인 편차가 심하므로 총생에 대한 관리는 일반적인 지식뿐만 아니라 개개인의 특성에 적합한 방법이 고려되어야 한다.

• 치과방사선
• /
• 제8권1호
• /
• pp.17-21
• /
• 1978

The study was to analyze on the hard and soft tissue profiles in mixed dentition. The subject consisted of 100 males and 100 females from 9 to 12 years of age and with a normal occlusion and acceptable profiles. On the basis of SnH line and SnV line, the author traced all the cephalograms and calculated the mean value and standard deviation in each measuring category and evaluated the sexual difference, the proper limit of development. The obtained results were as follows; 1. Individual variations of the lower facial part were larger the upper facial part in depth and height. 2. Sexual difference of lower facial part was significant in depth and height. 3. All the measured values to the SnH and SnV line were larger in male than in female but revealed resemblance in the profilogram. 4. The measured values of the region of nose, upper lip and point A showed stable tendency.

• 대한소아치과학회지
• /
• 제7권1호
• /
• pp.17-20
• /
• 1980

The purpose of this investigation was to make a comprehensive study and evaluation of the oral hygiene status by considering dental plaque index in 60 children age 7-9. The obtained results were as follows 1) Average plaque index of total mandibular teeth was higher than that of maxillary teeth. (Mandible; 2.14, Maxilla; 1.98) 2) In average plaque index per tooth surface, plaque index of facial surface was higher than that of lingual surface in maxilla and lower in mandible. 3) In mixed dentition, dental plaque occur most frequently and in greater quantity on the buccal surfaces of the maxillary permanent 1st molars and the lingual surfaces of the mandibular anterior permanent incisors.