• Imaging Science in Dentistry
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• v.40 no.3
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• pp.131-135
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• 2010

Purpose : The aim of this study was to investigate the timing and sequence of eruption of permanent canine and premolars, and to evaluate tooth calcification stage on emergence in Korean children. Materials and Methods : The sample was comprised of 1,266 children (male 720, female 546) aged from 7-13 years. Tooth eruption and calcification stages were determined through oral and panoramic radiographic examination, respectively. Probit analysis was used to calculate the timing of tooth eruption and tooth calcification stage from these cross-sectional data. Results : In both males and females, eruption occurred around the time when one third of tooth root or more was formed. The sequence was as follows: first premolar, canine, and second premolar in maxilla, and canine, first premolar and second premolar in mandible. Tooth eruption occurred earlier in girls compared with boys, averaging 0.63 years. Conclusions : Eruption sequence is identical in males and females with a trend for females to erupt earlier than males. Tooth eruption becomes earlier over the past decades in Korean children.

• The korean journal of orthodontics
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• v.30 no.1 s.78
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• pp.43-52
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• 2000

Hemifacial microsomia ( HFM ) is the second most common craniofacial abnormalies. HFM represnted a spectrum of clinical findings such as hypoplasia of the mandibular ramus and condyle, confinement of maxilla growth, external and/or middle ear defects, involvement of some cranial suture, buccal soft tissue, facial nerve, and muscles in the affected side. HFM often showed progressive facial asymmetry and occlusal plane slanting to the affected side with growth. There were several reports about asymmetry of tooth maturation, hypodontia, delayed eruption, enamel hypoplasia in HFM. Since teeth develope in close association with size and morphology of the maxillary and the mandible, it is highly likely that dental changes will be present in HFM. So the Purpose of this study was to investigate the differences of the primary and the permanent teeth dimensions in the maxillary and the mandibular dentition between the affected and the non-affected side of HFM.. The sample of this study consisted of 34 unilateral HFM Patients (18 males and 16 females, average age : 5 year 11 months old). The authors examined the mesiodistal and the faciolingual dimensions of the primary and the permanent teeth and performed statistical study by using paired t-test. The results were as follows 1. The mesiodistal dimensions of the mandibular second primary molar and the mandibular first permanent molar in the affected side of HFM were significantly smaller than those of non-affected side. But there were no significant differences in the anterior teeth and the mandibular first primary molar. It means that a gradient of severity from anterior teeth to posterior teeth was found in the mandibular dentition. 2. Although there were no significant differences in the faciolingual dimensions of the primary and the permanent teeth in the maxillary and the mandibular dentition between the affected and non-affected side of HFM, there were general trend of compensatory increase in faciolingual dimension of the mandibular primary and the permanent teeth in the affected side Therefore these results showed that HFM might affect on the abnormality of tooth dimension, especially the most posterior teeth, in the affected side of the mandible.

• Journal of the korean academy of Pediatric Dentistry
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• v.23 no.4
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• pp.893-898
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• 1996

The occlusal disharmonies resulted from labially protruded or malpositioned teeth can damage the periodontium and induce the non-inflammatory gingival recession. For these cases, a conservative approach was performed by improving oral hygiene and correcting the axial and positional status of the gingivally recessed teeth and removing the prematurely contacted areas. In some cases, rapid remission of tooth mobility and gradual decrease of gingival recession was observed just after start of treatment. In cases of gingival recession in permanent lower incisors of the children with mixed dentition, the treatment of choice is non-surgical conservative approaches. In cases when the gingival inflammation can be controlled through reinforcing the oral hygiene, when attached gingiva have a potential to increase in width through growth (not more than 1 year after eruption or not yet arrived at adult level), and when the recession can be corrected by moving the teeth from labial cortical plate through orthodontic treatment, the conservative measures would be the first choice. On the contrary, when recession has exceeded beyond the level of CEJ, when the gingival inflammation existed with the cause of poor oral hygiene, when the attached gingiva have little potential to increase (for example, more than 8 years after eruption), and when the conservative measures yielded no benefit after 4-8 weeks of treatment, the surgical approaches should be sought.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.2
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• pp.224-228
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• 2005

The effect of primary tooth infection on permanent teeth was reported by many previous study. It is seen histologic change in the enamel forming organ and in the surrounding sac, thus produce the defect as either hypoplasia or hypocalcification and alter the eruption of the permanent teeth. The periapical inflammation cause permanent tooth displacement in various direction and can be classified into the three categories : rotation, deflection inversion. This study reported case which displacement of succedaneous teeth may be caused by periapical infection of primary dentition and concluded that treatment procedure of infected primary tooth is selected and performed by importance to retain the tooth for space maintain, possibility to successfully restored, evidence of abnormal development of the succedaneous tooth.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.2
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• pp.255-260
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• 2001

Trauma to the primary incisors may cause developmental or eruptional disturbance of the permanent successors. Two cases illustrate developmental disturbances of arrested root formation, dilaceration, and eruptional disturbances of impaction, ectopic eruption of permanent successors caused by traumatic injury to deciduous incisors. The patient of the first case suffered trauma at the age of 4 years 7 months, causing alveolar bone fracture including the maxillary right primary central and lateral incisors that were immedi-ately extracted. The second patient had trauma episodes at the age of 3 years. Avulsion of the maxillary primary right central and lateral incisors were occurred due to trauma. After such trauma, regular follow-up including radiographs is necessary to detect early any possible interference with normal eruption of permanent successors.

• Journal of Korean Dental Science
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• v.7 no.1
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• pp.31-37
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• 2014

Dentigerous cyst (DC) is an odontogenic cyst associated with the crown of an impacted, embedded, unerupted, or developing tooth. It is the second most common type of odontogenic cysts, accounting for 14% to 24% of all jaw cysts. Although these cysts occur more frequently during the second and third decades of life, they can also be found in children and adolescents in the mixed dentition stage. Treatment of the odontogenic cyst involves enucleation or marsupialization/decompression methods. The latter approach is preferred for larger cysts, and it is especially helpful in adolescent patients in conserving the unerupted permanent successors. The aim of treatment for DC is the complete elimination of pathology and maintenance of dentition with minimal surgical intervention. Recently defined criteria for the selection of treatment modality include the cyst size and location of the cyst, patient age, dentition involved, stage of root development, position of the tooth involved in the jaw, and relationship with the surrounding vital structure. Marsupialization or decompression technique has been advocated by several authors for treating DCs among young patients. In this conservative technique, the creation of an accessory cavity helps relieve intra-cystic pressure and accelerate the healing of cystic lesion. This technique has been successfully performed and is indicated for growing children and adolescents. Here, we report a large cyst lesion in the mandible treated by marsupialization for conservative management. In conclusion, successful reduction in size was achieved, and intraoperative complication could be prevented.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.14 no.1
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• pp.31-35
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• 2018

Dentinogenesis imperfecta is a hereditary disorder that causes abnormal dentin formation and tooth morphology. Affected teeth show very thin dentin and large pulp chamber. Immediately after their eruption, the teeth tend to be destroyed rapidly. Early dental intervention is recommended to improve the feeding capacity and quality of life for the child, to maintain vertical dimension, and to promote healthy and functional dentition. This case report describes a treatment for a 4-year-2-month-old girl whose primary and permanent dentition were affected by Dentinogenesis Imperfecta. Shell teeth were observed in the entire primary dentition. The pulp of most teeth was exposed and the patient complained of pain. Most paternal family members were transferred to the Dentinogenesis Imperfecta. She needed an extensive dental treatment, but her compliance could not be expected because she was very young and anxious. So we decided to treat her under general anesthesia. All molar teeth are restored with Stainless Steel crown. Maxillary anterior teeth were extracted and mandibular anterior teeth are restored with composite resin. The patient's pain disappeared and masticatory function was restored.

• Korean Journal of Cleft Lip And Palate
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• v.15 no.2
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• pp.69-82
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• 2012

Our Team Approach consists of following five stages; (1) Peri-natal care until lip repair After ultrasound diagnosis, some obstetricians recommend the mother with CL/P fetus to undergo prenatal counseling in our CLP clinic. On the day the CL/P baby was born, our oral surgeon, nurse, and pedodontist visit the maternity clinic, and take counseling and take impression for a feeding plate. The cheiloplasty is performed in three months old. (2) From lip repair to palatal repair At one year of age, Otorhinolaryngologist checks middle-ear disease. Palatoplasty is carried out at 1.5 - 2 years old. (3) In deciduous and early mixed dentitions Speech is the most important issue in social life for the CL/P subjects, therefore the training of velopharyngeal function is essential. Orthodontist monitors dentofacial development from 5 years of age. In the case of severe maxillary under-growth or severe collapse, maxillary protractor or lateral expansion is indicative, respectively. In early mixed dentition, upper central incisor on the cleft area erupts with some torsion, and then the traumatic occlusion with tooth torsion must be corrected. (4) In mixed dentition Right before the eruption of upper canines, secondary bone grafting is performed. One year prior to the operation, maxillary fan-type expansion is carried out to correct the collapse of maxillary segments. Following the surgical operation, the erupted canine will be moved into the transplanted bone to avoid alveolar resorption. (5) In permanent dentition Final tooth alignment is carried out after eruption of second molars. Some cases may require orthognathic surgery after physical maturation. Prosthetic oral rehabilitation including the dental-implant is carried out after age eighteen.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.1
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• pp.101-108
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• 2005

Children are in mixed dentition during 6 years after 3 years old. this time is very important for sound permanent dentition. There are many factors of influence to tooth eruption stage ; adjacent teeth, tooth resorption, early loss or retention of deciduous tooth, local lesion, lip and tongue, masticatory muscles, ect. These factors should be in balance, if not, relation of adjacent teeth is changed, then severe malocclusion is occurred maybe. These cases revealed influences of resin bonded metal splint on occlusal surface of children's molar to mixed dentition. Splints interfere with falling off of deciduous tooth, tooth eruption, normal occlusion formation, and development of mixed dentition and occlusion. Therefore we removed the metal splint from teeth, follow-up checked occlusion and tooth eruption.

• Journal of the korean academy of Pediatric Dentistry
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• v.37 no.2
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• pp.260-266
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• 2010

Trauma to the primary teeth may have an effect on the successive permanent teeth. Thus, the treatment plans should be focused on safety of their permanent teeth. The degree of developmental disturbances in those permanent teeth depends upon many factors including the age of the children, developmental conditions of the affected teeth, types and severities of trauma and time interval from the moment of trauma to the initial treatment the patients received. The complications of the effected permanent teeth vary from the mild enamel hypoplasia to the premature finishing of teeth development. In this study, children whose ages were 33 months, 5 years, and 26 months presented the developmental disturbances to their permanent teeth, which resulted from the trauma to the primary teeth: the intrusion, the avulsion, and the subluxation. There showed a mild complication in the case of subluxation resulting in enamel hypoplasia, but, the more severe complication of the root dilacerations occurred in the case of intrusion. Furthermore, the 5-year-old patient whose primary dentition was near in transition period to the permanent one, the more complicated problem such as stop of root development of the permanent teeth was resulted from the avulsion. Thus, one should assume that the types of trauma and the age of the children at the moment of trauma have different effects on those successive permanent teeth. In conclusion, when the trauma that causes changes in the position of primary teeth happened, it is important to arrange an appropriate treatment procedure considering the types of trauma and the developmental conditions of the permanent teeth.