• Journal of the korean academy of Pediatric Dentistry
• /
• v.32 no.1
• /
• pp.18-25
• /
• 2005

Traumatic bone cyst is a nonodontogenic cyst without epithelial-linig which contains fluid in it's cavity, and it is limited by bone walls with no evidence of infection. Traumatic bone cyst is asymptomatic and appears more frequently in the second decade. Gender distribution is approximately equal, although males are affected slightly often than females. Radiographically the lesion shows a well demarcated radiolucent lesion of variable size and the lesion may have scalloped margins. The adjacent teeth to traumatic bone cyst remains vital. Traumatic bone cyst is usually treated by surgical exploration and currettage of the lesion. In the first case of this case report, the patient was refered from the local dental clinic for the radiolucent area under the left mandibular first molar. From the panorama radiograph at the first visit, the radiolucent area of the left mandible showed a well defined scalloped margin and identified as traumatic bone cyst. In the second case, the patient have visited for the chief complaint of swelling and abcess of right maxillary second premolar. In the radiographic check up with panorama radiograph, the radiolucent lesion with well demarcated scalloped margin was found in the right mandible body, and identified as traumatic bone cyst. In the first case, overinstrumentation was done through the mesial root canal to irrigate the lesion. In the second case, not any treatment was done, and watched the progression of the lesion. And in both cases, after two month, the radiolucency and the size of the lesion has decreased to show healing in progress.

• The Journal of Korea Assosiation for Disability and Oral Health
• /
• v.14 no.1
• /
• pp.26-30
• /
• 2018

Aspiration of tooth can occur not only during dental treatment, but also due to factors like trauma or physiologic exfoliation of primary tooth. If this occurs, complications such as fever, cough, dyspnea, pain, and bronchitis can be appeared. 9 years-old girl with Lennox-Gastau syndrome visited the dental clinic for regular checkups. Calcified tooth-like material was observed in the chest PA x-ray, and maxillary left primary first molar was not observed in the patient's oral cavity. She had a history of hospitalization for pneumonia two months ago. Because it was considered that the tooth was likely to be aspirated and caused pneumonia, the extraction of remaining primary teeth with mobility was performed. It is necessary to reduce the risk of aspiration in patient with disabilities by performing active treatment such as removal of primary tooth with mobility or ill-fitting restorations.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.48 no.3
• /
• pp.291-301
• /
• 2021

The aim of this study is to compare the properties of odontoblast gene of early passage cells and late passage cells derived from impacted maxillary supernumerary teeth. Impacted supernumerary teeth with maxilla were extracted from 12 patients (8 males, 4 females) between 6 - 9 years old without medical history. Real-time polymerase chain reaction (PCR) was conducted to compare characterization of odontoblast cell in the 3rd and 10th passage, and between with bone inducing additive group and without additive group. Genes for odontoblasts characteristics are osteonectin (ONT), alkaline phosphatase (ALP), osteocalcin (OCN), dentin matrix protein 1 (DMP-1) and dentin sialophosphoprotein (DSPP). The level of gene expression was in a decreasing order of ONT, ALP, OCN, DMP-1 and DSPP in the 3rd passage, and in decreasing order of ONT, DMP-1, OCN, ALP, and DSPP in the 10th passage in the undifferentiation and differentiation group. The order of ONT, DMP-1, and OCN did not changed. ALP and DMP-1 were switched in order. ALP and DMP-1 may be used as important markers for differentiating between the 3rd passage and 10th passage cells. Considering that supernumerary tooth was extracted young age and the time required to cultured 10th passage was short, supernumerary tooth can be considered a useful donor site of dental pulp stem cells.

• Imaging Science in Dentistry
• /
• v.30 no.3
• /
• pp.183-188
• /
• 2000

Purpose: This study was to evaluate the beam quality of intraoral X-ray equipments used at Yonsei University Dental Hospital (YUDH) using the half value layer (HVL) and the characteristic curve of intraoral standard X-ray film. Materials and Methods : The study was done using the intraoral X -ray equipments used at each clinical department at YUDH. Aluminum filter was used to determine the HVL. Intraoral standard film was used to get the characteristic curve of each intraoral X-ray equipment. Results: Most of the HVLs of intraoral X-ray equipments were higher than the least recommended thickness, but the REX 601 model used at the operative dentistry department and the X-707 model used at the pediatric dentistry department had HVLs lower than the recommended thickness. The slopes of the characteristic curves of films taken using the PANP AS 601 model and REX 601 model at operative dentistry department, the X-70S model of prosthodontic dentistry department, and the REX 601 model at the student clinic were relatively low. Conclusion: HVL and the characteristic curve of X-ray film can be used to evaluate the beam quality of intraoral X-ray equipment. In order to get the best X-ray films with the least radiation exposure to patients and best diagnostic information in clinical dentistry, X -ray equipment should be managed in the planned and organized fashion.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.38 no.2
• /
• pp.119-128
• /
• 2011

In the process of assessing the children with anterior crossbite in early mixed dentition, it has frequently been detected that the stronger the skeletal pattern of the malocclusion is, the more markedly delayed the development and eruption of maxillary teeth are. If the anteroposterior characteristics of craniofacial skeleton has any relationship with dental maturation, the evaluation of dental development and eruption was thought to be able to contribute to early diagnosis of crossbite in children. This study was performed for the purpose of elucidating the relationship between dental maturation of maxillary teeth and some cephalometric values in children with anterior crossbite of maxillary undergrowth type in early mixed dentition. Among the children in Hellman dental age IIA and IIC who attended the Pediatric Dental Clinic of Pusan National University Hospital with orthodontic problems, cases with Class III malocclusion were classified and 50 cases of maxillary undergrowth type and type with normal maxilla respectively were randomly selected and studied as subjects. From their lateral cephalographs and panoramic radiographs, their anteroposterior skeletal features, the dental maturity and eruption rate were obtained of each group and data were analyzed to yield the results as follows: 1. Comparing the maturity of maxillary teeth of both groups, only the first molars of maxillary undergrowth group showed significantly slower development and eruption (p<0.05). 2. There was high correlation between maturation of maxillary 1st molar and chronological age(p<0.05). 3. Among the parameters of anteroposterior relationship of skeletal pattern in maxilla and mandible. Wits was revealed as a useful index to predict both the calcification and eruption rate of the 1st molars whereas SNA was to eruption rate(p<0.05).

• Journal of the korean academy of Pediatric Dentistry
• /
• v.39 no.1
• /
• pp.73-78
• /
• 2012

Complex odontomas consist of a conglomerate mass of enamel, dentin and cementum which bears no anatomic resemblance to a tooth. The majority of these lesions are completely asymptomatic, being discovered on routine radiographic examination or when films are taken to determine the reason for tooth eruption failure. Compound odontomas seldom cause bony expansion, but complex odontomas often cause slight or even marked bony expansion. Complex odontomas are mostly associated with permanent teeth and very rarely associated with deciduous teeth. They are usually located in the first-or second-molar areas of the mandible. This report presents a case of a patient with impaction of a maxillary primary canine by a complex odontoma in which surgical excision of the lesion was performed. And the primary canine was repositioned right under gingival level for spontaneous erution. Follow-up after six months showed spontaneous eruption ofthe repositioned maxillary primarycanine.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.46 no.1
• /
• pp.21-28
• /
• 2019

The aim of this study was to compare the shear bond strengths of orthodontic bracket with Conventional primer (CP), Moisture insensitive primer (MIP), and Self-etching primer (SEP). In addition, the effect and the timing of saliva contamination on shear bond strength was evaluated. A total of 135 bovine mandibular incisors were used in the study and divided into 3 groups. Group I, II and III were used CP, MIP, SEP, respectively. Each group was then divided into three subgroups: the group without saliva contamination, the group with primer application after saliva contamination, and the group with saliva contamination after primer application. After the primer application, the metal bracket for the lower incisor was attached and the shear bond strength was measured. The mean shear bond strengths was highest with CP and lowest with SEP in dry condition. However, CP showed a significant decrease in shear bond strength in the presence of saliva contamination. MIP and SEP showed no significant decrease in shear bond strength with saliva contamination.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.47 no.1
• /
• pp.70-77
• /
• 2020

The present study is aimed to assess the effect of antimicrobial photodynamic therapy (aPDT) on Streptococcus mutans biofilm through teeth whitening light emitting diode (LED). Planktonic and dynamic biofilm state cultures of S. mutans were used. Erythrosine 20 μM/L was used as the photosensitizer. Irradiation was performed by exposing cultures to clinic and homecare whitening LEDs for 15 minutes. The viability was measured through Colony Forming Unit counts and confocal laser scanning microscopy. aPDT using whitening LEDs and erythrosine significantly decreased the CFU count of S. mutans compared to that in the control group. Dynamic biofilm group showed more resistant features to aPDT compared with planktonic state. Clinic and homecare whitening LED device showed similar antimicrobial effect. The whitening LED, which could irradiate the entire oral arch, showed a significant photodynamic effect on cariogenic S. mutans biofilm. aPDT mediated by erythrosine and LEDs used for teeth whitening exhibited promising antimicrobial activity.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.37 no.3
• /
• pp.338-344
• /
• 2010

The purpose of this study was to evaluate the effect of children's tonsil size on the behavior during pediatric dental sedation. The sedation records of thirty five children were examined in this study. All the sedations had been performed using chloral hydrate/hydroxyzine, nitrous oxide/oxygen or/and submucosal midazolam, and the subjects were divided into 4 groups according to their tonsil size using Brodsky's tonsil classification. The results were as follows: 1. The patients with enlarged tonsils showed negative behaviors in all behavior rating aspects(sleep, movement, crying, overall behavior) during sedation than those with normal tonsils(p<0.05). 2. Enlarged tonsils were correlated with mouth breathing(p<0.05) but not with snoring and coughing(p>0.05) during sedation. 3. For the patients with enlarged tonsils, significantly higher doses of midazolam were administered during sedation than for those with normal tonsils(p<0.05).

• The Journal of Korea Assosiation for Disability and Oral Health
• /
• v.7 no.2
• /
• pp.99-102
• /
• 2011

A-12year-old boy visited the clinic with chief complaint of anterior maxillary trauma. He was diagnosed with first degree mental retardation and cerebral disorders. By clinical and radiographic examination, intrusion of maxillary central incisors were found. The intrusion was not severe, teeth were luxated with a slight force and the prognosis was followed. After the first year, external root resorption was seen radiographically. Due to difficult behavior management, one visit root canal filling with OrthoMTA(BioMTA, Korea) which is known to generate of cementum and periodontal ligament was planned along with general anesthesia. OrthoMTA was filled from the apex to 1-2mm below cervical area and composite resin used for crown restoration. 6 months after, further resorption, discoloration and mobility was not found. This case is currently checked yearly and further research is needed for inflammatory root resorption and ankylosis.