• Imaging Science in Dentistry
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• 제42권3호
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• pp.197-200
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• 2012

Gemination, a relatively uncommon dental anomaly, is characterized by its peculiar representation as a tooth with a bifid crown and a common root and root canal. It usually occurs in primary dentition. To come across gemination in a supernumerary tooth is a rare phenomenon. The purpose of this paper is to present a unique case of hyperdontia wherein gemination in an impacted supernumerary tooth resulted in a trifid crown unlike the usual bifid crown. The role of conventional radiographs as well as computed tomography, to accurately determine the morphology and spatial location, and to arrive at a diagnosis, is also emphasized in this paper.

• Restorative Dentistry and Endodontics
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• 제43권4호
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• pp.44.1-44.9
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• 2018

Fusion and gemination are developmental anomalies of teeth that may require endodontic treatment. Fusion may cause various clinical problems related to esthetics, tooth spacing, and other periodontal complications. Additional diagnostic tools are required for the diagnosis and the treatment planning of fused tooth. The present case report describes a case of unilateral fusion of a supernumerary root to an upper permanent central incisor with large periapical lesion in which a conservative approach was used without extraction of supernumerary tooth and obturated with mineral trioxide aggregate to reach a favorable outcome.

• Restorative Dentistry and Endodontics
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• 제39권1호
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• pp.45-50
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• 2014

Ambiguity in the root morphology of the mandibular second molars is quite common. The most common root canal configuration is 2 roots and 3 canals, nonetheless other possibilities may still exist. The presence of accessory roots is an interesting example of anatomic root variation. While the presence of radix entomolaris or radix paramolaris is regarded as a typical clinical finding of a three-rooted mandibular second permanent molar, the occurrence of an additional mesial root is rather uncommon and represents a possibility of deviation from the regular norms. This case report describes successful endodontic management of a three-rooted mandibular second molar presenting with an unusual accessory mesial root, which was identified with the aid of multiangled radiographs and cone-beam computed tomography imaging. This article also discusses the prevalence, etiology, morphological variations, clinical approach to diagnosis, and significance of supernumerary roots in contemporary clinical dentistry.

• 대한소아치과학회지
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• 제49권3호
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• pp.348-356
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• 2022

과잉치는 치판의 과도한 성장과 분화에 의해서 발생된다. 이로 인해 이소맹출, 맹출지연, 인접치의 치근 흡수, 그리고 치간이개 등의 문제가 발생할 수 있다. 영유아기에서의 과잉치는 드물며 국내에서는 거의 보고되지 않았다. 이 증례에서는 3개의 매복된 과잉치가 있는 생후 2일된 신생아에 대해 보고하고 있으며, 환자는 21개월간 추적 관찰되었다. 유치열기에 맹출된 하나의 과잉치는 14개월이 되었을 때 중등도 진정 하에 발치되었다. 발치된 과잉치에 대해 micro-computed tomography (CT) 분석을 진행하여 치근단 부위의 미세한 형태 이상을 확인하였다. 과잉치 발치 후 치간이개는 감소하였고 구강위생도 개선되었다. 조기 진단 및 치료를 통해 과잉치로 인한 합병증을 예방할 수 있다.

• Restorative Dentistry and Endodontics
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• 제39권4호
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• pp.319-323
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• 2014

In dentistry, the term 'fusion' is used to describe a developmental disorder of dental hard tissues. In the permanent dentition, fusion of a normal tooth and a supernumerary tooth usually involves the incisors or canines. However, a few cases of fusion involving premolars have also been reported to date. We present a rare case in which fusion of the maxillary left second premolar and a supernumerary tooth in a 13-year-old girl was diagnosed using cone beam computed tomography (CBCT, Alphard-3030, Asahi Roentgen Ind. Co., Ltd.). The tooth was bicuspidized after routine nonsurgical root canal treatment, and the separated teeth underwent appropriate restoration procedures. The second premolar and supernumerary tooth remained asymptomatic without any signs of inflammation after a follow-up period of 9 years. Identification of anatomical anomalies is important for treatment in cases involving fusion with supernumerary tooth, and therefore the microscopic examinations and CBCT are essential for the diagnosis. Fused teeth can be effectively managed by the comprehensive treatment which includes both endodontic and periodontal procedures.

• 대한소아치과학회지
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• 제49권1호
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• pp.25-34
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• 2022

이 연구의 목적은 상악 측절치 과잉치의 해부학적인 특징과 정상 측절치와의 관계에 대해 정량적 분석을 시행하는 것에 있다. 43명의 44개의 상악 측절치 과잉치를 대상으로 전산화 단층 방사선사진을 이용하여 측절치 과잉치의 위치, 형태, 방향 및 측절치 과잉치와 인접한 영구전치와의 관계를 관찰하였다. 또한 측절치 과잉치와 인접한 측절치 및 반대측 측절치의 크기를 비교하기 위해 각각의 치관 근원심 폭경을 계측하였고, 치아성숙도를 비교하기 위해 Nolla stage를 이용하여 각 치아의 치근 발육 정도를 평가하였다. 측절치 과잉치는 90.9%의 비율로 정위 방향으로 존재하였고, 84.1%가 보충형의 형태로 존재하였다. 측절치 과잉치는 인접한 측절치나 반대측의 측절치에 비해 치관의 크기가 통계적으로 유의하게 작았고(p < .0001), 치근 발육 단계에서는 통계적 유의미한 차이를 보이지 않았다. 결론적으로, 상악 측절치 과잉치는 정상측절치와 매우 유사하지만 치관 크기에 있어서 차이를 보인다. 상악 측절치 과잉치가 존재하는 경우, 교정적 혹은 심미적인 문제를 줄이기 위해 측절치와 과잉치를 정확하게 구분하여 치료하는 것이 중요하다.

• 치과방사선
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• 제21권2호
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• pp.393-403
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• 1991

The purpose of this study was to evaluate the incidence and radiographic features of 1,300 cases of supernumerary teeth by means of the analysis of periapical radiograms and/or pantomograms in 69,442 persons visited the Department of Oral Radiology, School of Dentistry, Kyung Hee University during January 1980 to December 1989. This study of supernumerary teeth revealed the following features: 1. The incidence of supernumerary tooth was revealed to be 1.5% in total examined persons, and there was a higher incidence in males (74.0%) than in females (26.0%). 2. The supernumerary teeth were most frequently occurred in the 1 st decade (42.7%), followed by the 2nd decades (20.2%), the 3rd decades (14.1 %), and the 5th decades (7.2%). 3. There was a higher incidence in the maxilla (98.7%) than in the mandible (1.3%), and mesiodens (90.1 %) was the most frequently occurred. The maxillary lateral incisor region (3.1%) was next in order of frequency followed by maxillary distomolar (2.2%), and maxillary paramolar (1.5%). 4. There was a higher incidence of the impaction (82.7%) than that of the eruption (17.3%), and supernumerary tooth in lateral incisor region (87.8%) was the most frequently impacted one. 5. The inverted impaction was occurred in 63.1%, the vertical impaction in 18.1%, and the angulated impaction in 18.8%. In localization, a palatally (lingually) impacted supernumerary tooth was occurred in 85.0%, and middle impacted and buccally (labially) impacted supernumerary tooth showed the same incidence (7.5%). 6. A supplemental tooth was occurred in 3.2%, an accessory tooth in 96.8%, and a supplemental tooth was the most frequently occurred in maxillary lateral incisor and mandibular premolar region. 7. In effects of supernumerary tooth on adjacent tooth, crowding was occurred in 0.4%, diastema in 10.6%, rotation in 5.4%, eruption disturbance in 4.5%, root resorption in 2.5%, and dentigerous cyst in 2.2%.

• 대한치과의사협회지
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• 제13권9호
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• pp.829-832
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• 1975

The authors have observed four cases of supernumerary teeth on the upper molar regions. The characteristics were as follow : 1. The sites of the supernumerary teeth were different on the right and left sides in female patietn. 2. The paramolar teeth were smaller than the normal molar teeth. 3. The extracted paramolar teeth had a sigle root and curved mesially.

• Restorative Dentistry and Endodontics
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• 제6권1호
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• pp.149-152
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• 1980

In this article, we found the dentigerous cyst due to the impacted supernumerary tooth. Involved teeth were treated with immediat canal filling and root resection technique. The cystic walls and its contents were marsupialized and perfectly enucleated with surgical techniques. After the operations, no clinical signs and symptoms were found, Radiographic findings after I months of the operations reveal the decrease of the radiolucency on the surgical field. The author thinks that it indicate the formation of the osteoid tissue.

• 대한치과의사협회지
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• 제11권2호
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• pp.131-133
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• 1973

A Case of a supernumerary teeth on the buccal side of upper right and left molar teeth was observed from a 21 years young Korean female. The characteristics were as follows : 1. The site of the occurrence were resemble on the right and left sides. 2. The cusps of the supernumerary tooth on the right side were resemble to the premolar, and the cusp of the left one was added by one more cusp than the normal molar tooth. 3. The supernumerary teeth were smaller than the normal teeth size. 4. The right and left teeth had only one root.