• Journal of the korean academy of Pediatric Dentistry
• /
• v.28 no.1
• /
• pp.180-184
• /
• 2001

Cleidocranial Dysplasia(CCD) is an autosomal dominant human bone disease characterized by abnormal clavicles, patent sutures and fontanelles, and dental anomalies. Among dental anomalies, it is characterized that permanent dentition is severly disturbed due to multiple supernumerary teeth and abnormalities of tooth morphology. A eight-year-old female patient diagnosed as cleidocranial dysplasia visited in our hospital. Upon clinical oral exam, retained deciduous teeth, constriction of dental arch, anterior cross bite, and multiple dental caries were observed. In the dental panoramic radiograph, retained deciduous teeth and multiple supernumerary teeth in the maxilla and the mandible were found. In the cephalometric radiograph, open sutures and wormian bones were seen. In the chest P-A view absence of clavicles was observed. The cleidocranial dysplasia patients have eruption problems in permanent dentition both in regions with and without supernumerary teeth. The severely delayed or arrested eruption of permanent teeth has been ascribed to various factors : 1) The presence of multiple supernumerary teeth, 2) malformed roots with lack of cellular cementum, 3) the jaw bone being too dense, and 4) abnormal resorption of bone and primary teeth. Formation and maturation of primary teeth in cleidocranial dysplasia are normal, whereas the permanent dentition has various anomalies. Therefore, dentists should understand the development of dentition in cleidocranial dysplasia, and treat them in proper time.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.35 no.2
• /
• pp.268-277
• /
• 2008

Authors evaluated 1171 patients at the department of Pediatric Dentistry in Kyoungpook National University Hospital through clinical records and radiographs. And the following features were studied ; age, sex distribution, number of mesiodens per patients, cause of discovery of mesiodens, location, status of eruption, shape and orientation of crown, complication, dental age of adjacent upper incisor tooth at the time of surgical extraction of mesiodens and the relationship between the resolution rate of complication after extraction of mesiodens and the dental age of adjacent upper incisor tooth, length of diastema, the eruption status of lateral incisor and the crowding status of premaxilla. The followings are the results : 1. The cause of discovery of mesiodens were as follows ; delayed eruption of the permanent incisors in 13.8%, midline diastema in 11.6%, radiographs taken for other reasons in 23.4% and for caries treatment in 15.1%. 2. Complication due to the presence of mesiodens did not occur in 36.8%, delayed eruption of adjacent teeth was observed in 16.1%, midline diastema in 34.4%, rotation in 8.8%, displacement in 2.4%, and crowding in 1.0% of all evaluated patients. 3. As for the dental age of adjacent upper incisor tooth at the time of surgical extraction of mesiodens, below 1/3 of total root length were observed in 3.5%, $1/3{\sim}1/2$ of total root length in 19.9%, $1/2{\sim}2/3$ of total root length in 54.7% and over 2/3 in 21.9% of all evaluated patients. 4. Resolution rate of delayed eruption after the extraction of mesiodens was significant higher in the group with the root length below 1/2. Resolution rate of midline diastema was significant higher in the group with diastema width below 3mm and with non-crowding of adjacent upper incisor teeth.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.31 no.4
• /
• pp.665-670
• /
• 2004

The mandibular buccal frenum becomes a problem when its attachment is too close to the marginal gingival. Heavy buccal frenum mucogingivally results in insufficient attached gingiva, inadequate vestibular depth and also difficulty in eruption of mandibular premolar. The aim of this study is to demonstrate the effectiveness of apically positioned partial-thickness flap as adequate method in order to remove heavy buccal frenum and expose impacted teeth. The author presents the case of a 12-year-old boy. He had problems that was prolonged eruption of #34, #35 due to high pull buccal frenum. After space regaining for normal eruption of #34, #35, we performed apically positioned partial-thickness flap on #34, 35 area. As a results, we confirmed that eruption of #34, #35 has been processed normally And vestibular depth, position of buccal frenum and width of attached gingival was within a normal range. Decrease in muscle pull, adequate width of attached gingiva and increased vestibular depth can be expected from this treatment.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.34 no.4
• /
• pp.651-657
• /
• 2007

Odontomas are the common type of odontogenic tumors and generally are asymptomatic and frequently lead to impaction or delayed eruption of permanent teeth. They are composed of enamel, dentin, cementum and pulp tissue and are divided into compound and complex according to the morphology of the hard tissues. Compound odontomas consist of varying numbers of small toothlike structure and have a predilection for the maxillary anterior regions. Complex odontomas consist of an unorganized mass of odontogenic tissues and comprise approximately 25 percent of all odontomas and have a predilection for the mandibular posterior regions. The etiology of odontomas is uncertain but hypothesized to involve local trauma, infection and genetic factors. Treatment of odontoma is conservative surgical removal and are little probability of recurrence. These two cases were about the patients with delayed eruption of mandibular first molar and mandibular lateral incisor. We surgically removed odontoma, exposed impacted tooth and guided impacted tooth into normal position by orthodontic traction. At the completion of traction, the mandibular first molar and mandibular lateral incisor was positioned fairly within the arch and complications such as root resorption were not observed.

• The Journal of the Korean dental association
• /
• v.38 no.8 s.375
• /
• pp.780-783
• /
• 2000

• Journal of the korean academy of Pediatric Dentistry
• /
• v.36 no.1
• /
• pp.84-88
• /
• 2009

Tooth impaction refers to situations where a tooth fails to erupt due to mechanical blocking and remains unerupted beyond the normal time of eruption. It is commonly found in permanent dentition, but rarely in deciduous dentition. Tooth impaction is caused by systemic or local factors, and most common etiology is odontoma. Odontoma is also commonly found in permanent dentition, and rarely in deciduous dentition. We are presenting case of 4 year and 4 month year old girl, who had impacted and disto-angulated lower left deciduous second molar due to odontoma. We removed odontoma and performed orthodontic traction of impacted lower left deciduous second molar. Then, the impacted primary molar was erupted and acceptable occlusion was obtained.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.32 no.3
• /
• pp.550-556
• /
• 2005

Tooth impaction is defined as a cessation of the eruption of a tooth at the level of the oral mucosa or alveolar bone by any causes. Any tooth in the dental arch can be impacted, but the teeth frequently involved in a descending order are the mandibular and maxillary third molars, the maxillary canines, the mandibular and maxillary second premolars, and the maxillary central incisors. In these teeth, impaction of maxillary incisor occurs in about 0.1-0.5% and major causes are trauma, supernumerary teeth and periapical inflammation of primary maxillary incisor. Delayed eruption of a maxillary central incisor results in midline shift, the space's being occupied by an adjacent tooth and different levels of alveolar height. Treatment options are observation, surgical intervention, surgical exposure and orthodontic traction, transplantation and extraction. These cases were about the patients with delayed eruption of maxillary central incisor. We surgically exposed impacted tooth and guided it into normal position by the orthodontic traction. At the completion of traction, the maxillary central incisor was positoned fairly within the arch and complications such as root resorption were not observed.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.30 no.3
• /
• pp.448-452
• /
• 2003

Ameloblastic fibro-odontoma is a rare benign odontogenic tumor that mainly occurs at mandibular molar area. Radiography usually shows a well-defined radiolucent area containing various amounts of radiopaque material of irregular size and form. In histiologic aspect, Ameloblastic fibro-odontoma composed of connective tissue characteristic of an ameloblastic fibroma and calcined tissue identifying the tumor as a complex odontoma. Thirteen years two months aged boy of this case visited with chief complaint of delayed eruption of mandibular left canine. After enucleation of lesion, biopsy was done and diagnosed by ameloblastic fibro-odontoma. In continous follow-up check, canine erupted normally after operation.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.30 no.4
• /
• pp.605-610
• /
• 2003

Physiologic root resorption occur from the apex of the primary teeth close to the permanent teeth towards the apex. Pathologic root resorption occur on surfaces of root due to causes such as trauma, replantation, orthodontic treatment, delayed or irregular eruption of teeth, or growing cysts or tumors. In children, the most frequently affected teeth from trauma are the maxillary primary central incisors. After such an event, root resorption initiate from the traumatized pulp or periodontium. In this case report, periapical radiographs were used to evaluate the features of pathologic root resorption by studying patients with history of trauma. The following results were noted. 1. Pathologic root resorption was observed in various patterns in all of the 10 traumatized maxillary primary central incisors. 2. Though teeth with pathologic root resorption were treated with pulpectomy, the resorption process continued to progress.

• The Journal of Korea Assosiation for Disability and Oral Health
• /
• v.13 no.2
• /
• pp.91-94
• /
• 2017

Hypercementosis is an excessive deposition of secondary cementum on the root of a tooth. It is mostly presented as a solitary lesion or in rare cases as a generalized type, but which is seldom recognized; typically it is discovered during regular dental X-ray. Increased thickness of cementum is not uncommon but generalized hypercementosis on impacted permanent teeth which may cause delayed eruption is rarely reported. This case report discusses a patient with cerebral palsy, epilepsy and mental retardation that presents multiple hypercementosis with delayed eruption. On intraoral examination, multiple retained primary molar teeth were found. As there was no any further symptoms, regular dental checkup had been done for several years. In 2015, a surgical opening was performed in the second molar area, but there was no specific change. Panoramic view showed multiple impacted permanent teeth with increased thickness of roots due to excessive deposition of cementum. Hypercementosis was also observed in the root of the erupted tooth. Several laboratory test results including hormone, urine, complete blood count test were reviewed. The patient was also diagnosed with subclinical hypothyroidism, impaired fasting glucose and had been taken valproic acid($Orfil^{(R)}$) for 10 years. However, none of them clearly explained generalized hypercementosis or delayed eruption. The patient is now 24 years old and regular dental checkups and radiographs are taken to confirm that there is no change in the lesion.