• 한국임상수의학회지
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• 제35권4호
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• pp.137-140
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• 2018

A five-month-old toy poodle was referred for treatment of bilateral mandibular fractures. Preoperative skull and dental radiographs showed rostral mandibular fractures and permanent teeth that had not yet erupted. In addition to providing stability for the healing of fractures, it is very important to focus on restoring normal occlusion. The mandibular fractures were repaired using interdental wiring in a dentate area where the deciduous canines and fourth premolars were stable and could be used to anchor the interdental fixation. In the absence of an erupted permanent mandibular first molar, the modified Risdon wiring was performed using the deciduous mandibular fourth premolars as anchor teeth. An intraoral splint was placed on the mandibular teeth using self-curing composite resin. Five months after surgery, the patient had experienced no complications, and the permanent teeth had erupted normally. In this case, which involves a small-breed puppy with deciduous dentition, treatment with a wire-reinforced interdental splint using intact deciduous fourth premolar teeth as anchor teeth can be considered as a suitable method for rostral mandibular fracture restoration.

• 대한소아치과학회지
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• 제21권2호
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• pp.491-495
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• 1994

The ectopic eruption is defined rise to be abnormal eruption, which gives to displacement of the teeth and abnormal root resorption of adjacent teeth. The ectopic eruption of first permanent molar is approximately 2-4% of the population, most of them are in the maxilla, rarely in the mandible. In the case of the second permanent molars, most of them are found in the mandible for the reason of the arch length discrepancies and large size of the teeth. The ectopic erupted molars should be treated early in order to coordinate normal growth pattern and to obtain good occlusal support. So, this should be early diagnosed and treated. But, ectopically erupting molars are often self-corrected, hence periodic follow-up is required. The methods of the treatment are largely classified into surgical, surgical-orthodontic, and orthodontic method. Especially in orthodontic method, they are divided as follows; appliances that is positioned at the contact point for unlocking and the distal movement, fixed and removable appliance that is connected to more than one tooth, and occlusion guiding method after disking or extraction of the second deciduous molar. The report presents the good results in treating patients, whose chief complaint was ectopic eruption of mandibular permanent molars.

• 대한치과의사협회지
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• 제19권1호통권140호
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• pp.40-44
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• 1981

This study is proposed to analyze statistically the causes of extraction of permanent teeth among outpatients who visited our dental department of Sung-Sim Hospital, Chung-Ang University from Jan. 29th 1979 to Nov. 30th 1980. the results are as follows. 1. The group of patients aged 25-34 had more number of extracted teeth than any other age group. 2. It was found that woman's (0.13) was more than man's(0.9) in average number of extracted teeth per patient. 3. In analyzing the causes of extraction, it was identified as caries 37.5%, periodontal diseases 27.2%, wisdom teeth 17.6%, for orthodontic treatment and impacted supernumerary teeth and others 8.0% trauma and fracture 4.2%. 4. The primary cause of extraction was found to be changed from caries to periodontal diseases according to the increase of age. 5. The number of teeth that were extracted by trauma was found that man's (38) was more than twice as much as woman's (17) and the group of patients aged 35-44 had the most number of all age groups.

• Journal of Veterinary Science
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• 제21권6호
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• pp.83.1-83.14
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• 2020

Background: Bovine and porcine teeth are often used in in vitro experiments as substitutes of human teeth. Objectives: The aim of the present study was to perform a comparative analysis of enamel morphology of permanent human, bovine and porcine teeth under the scanning electron microscope. Methods: As many as 10 human, 10 bovine, and 10 porcine teeth were studied. All the teeth were sectioned and the halves were randomly divided into 2 groups according to the examined tissue (vestibular enamel at the mid-height of the dental crown and in the cervical area). Human and bovine enamel was etched for 15 sec and porcine enamel for 30 sec. The scanning electron microscope analysis was performed. The length and width of enamel prisms were determined with the "Met-Ilo" 1.1 computer program. Results: All enamel samples revealed the same etching pattern-Silverstone's type 2. Bovine enamel showed a similar porosity and the amount of interprismatic enamel compared to human enamel while the amount and width of interprismatic enamel bands in porcine enamel were evidently greater. The shape of the porcine prisms was visually similar to human prisms, although dimensions were significantly different. However, bovine prisms differed in form and appeared to be distinctly elongated. Conclusions: Reported findings indicate that the results of experimental studies carried out on bovine and porcine enamel should not be compared with the results obtained on human enamel.

• 대한소아치과학회지
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• 제38권3호
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• pp.276-283
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• 2011

최근 미성숙 영구치의 치근단 유두에서 존재하는 미분화 줄기세포가 새로 발견되었고 이 줄기세포들은 치근 상아질의 형성에 관여하는 법랑모세포의 근원으로 보여진다. 미성숙 영구치를 다룰때 이 줄기세포들의 보존은 치근의 지속적인 형성을 완성시키게 한다. 따라서 치근단 염증을 동반한 미성숙 영구치에서 치근단의 최소한의 침습으로 임상 및 방사선적 치유 양상을 관찰할 수 있었기에 보고하고자 한다. 본 증례는 조선대학교 치과대학병원 소아치과에 내원한 만 10세 남아(하악 우측 소구치), 만 8세 여아(상악 좌측 소구치)에서 임상 및 방사선 검사결과 치수괴사와 치근단 농양으로 진단된 영구치에서 치근단부위의 기구조작을 제한하고 MTA(Mineral Trioxide Aggregate)를 치수강내에 적용하였다. 정기적으로 관찰한 결과 치근단 농양의 치유와 치근 발육 및 성장의 양상이 관찰되었다. 치수괴사와 치근단 농양을 가진 영구치에서 치근단부위의 치수 및 치유두를 보호함으로써 관찰기간동안 양호한 예후를 보였으며, 이는 어린환자의 미성숙영구치에서 보존적 치수치료의 시도에 대한 보다 많은 임상적 검증 및 장기간의 고찰이 필요할 것이다.

• Imaging Science in Dentistry
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• 제34권1호
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• pp.55-59
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• 2004

Cleidocranial dysplasia is a rare and autosomal dominent disorder characterized by aplasia or hypoplasia of the clavicles, an open fontanelle, dental abnormalities, and short stature, A 17-year-old female who presented with short stature and subsequent delay in eruption of permanent teeth is described. she showed the abnormal hypermobility of the shoulder, ocular hypertelorism and concave nasal bridge. Radiographs revealed the underdeveloped maxilla, defect of the cranium in the fontanelle region, and aplasia of the clavicles. Characteristically, panoramic view revealed near parallel-sided borders of the ascending ramus and downward curvature of the zygomatic arch with hypoplasia. The prolonged retention of deciduous teeth with delayed eruption of permanent teeth and multiple embedded supernumerary teeth were striking. Radiographic and clinical investigations revealed Cleidocranial dysplasia.

• Journal of Oral Medicine and Pain
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• 제13권1호
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• pp.53-60
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• 1988

The authors have studied the growth and development of mandibular permanent teeth in order to the make basic data that are necessary to determine the forensic age. The 631 subjects whose ages range from 3 years to 18 years were selected to analyze calcification degree of mandibular teeth. The results were as follows: 1. There were significant differences between adjacent ages, except 14-15 years and 17-18 years. 2. In each tooth, these were differences between adjacent ages from 3 years to 10 years, except central incisor and third molars. 3. All teeth were almost completely developed at the age of about 14 years, except second and third molars. 4. In each tooth, there were the widest significances between adjacent ages in premolars.

• The Journal of Advanced Prosthodontics
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• 제8권3호
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• pp.241-250
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• 2016

Oligodontia is defined as a congenital tooth agenesis with the absence of six or more permanent teeth. This clinical report describes a patient with non-syndromic partial oligodontia, with retained deciduous teeth and the absence of 16 permanent teeth. Anterior esthetic problems were caused by interarch tooth size discrepancy, interdental space, aberrant tooth dimensions, and the absence of centric contacts of the anterior teeth. Prosthetic restoration after orthodontic and implant treatment was performed with a multi-disciplinary team approach. Favorable functional and esthetic results were obtained using a definitive prosthesis.

• 대한소아치과학회지
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• 제24권3호
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• pp.628-636
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• 1997

Impacted or unerupted permanent teeth have many problems in making a diagnosis and treatment plan in dental clinic. There are several methods to treat impacted teeth. The combination of surgical exposure and orthodontic traction is usually the treatment of choice in cases with impacted teeth. Two cases are reported, which were treated with surgical intervention and orthodontic movement. and one case is treated with orthodontic movement alone. To improve esthetic problem and maintain periodontal health, We should avoid loss of attached gingiva in surgical exposure, and excessive orthodontic force during the traction of the impacted tooth.

• 대한치과의사협회지
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• 제52권5호
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• pp.281-290
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• 2014

Tooth eruption disturbance is seen commonly in mixed dentition or early permanent dentition. During this period of time, children experience the growth and development of craniofacial skeleton and dentition, so the impaction and eruption disturbance of permanent teeth make many problems in oral and maxillofacial areas. Eruption guidance of impacted tooth is not simple because many factors related to impaction are considered. Several factors such as etiology, tooth development stage, location of impacted teeth or eruption pathway, patient cooperation, etc. need to be taken into consideration in deciding the management of the impacted tooth. In the present study, it was assessed the etiology and impaction status of impacted tooth through various cases, and try to explain the treatment method to guide eruption by surgical exposure.