Okhyung Nam

Minimal invasive treatment using patient-specific template for mandibular fractures in children: “Wing-splint” by CAD/CAM technology

w b m s R t to seat the splint accurately, which should be at least 3 mm thick, so that it is rigid enough to fix the mandible (Fig. 2). ircummandibular fixation with wire and acrylic splints is ommonly used for the treatment of mandibular fractures n children, but has some shortcomings, including addiional laboratory processing, which can increase the duration f the general anaesthesia or require additional sedation.1,2 iodegradable fixation can be also used but also mean proonged operating time and technical difficulties, and the oreign body used can cause a reaction.3 We present a simple, inimally-invasive technique based on the concept of exteral fixation that uses a template that is specific to the patient.4 We take a high-resolution computed tomogram (CT) of he craniofacial skeleton according to a standard protocol. atasets from this or any initial diagnostic scans that we lready have are imported into software (Mimics, Materilise, Leuven, Belgium) and converted to a 3-dimensional irtual model. The teeth are then separated from the virtual andible so that we can see the roots of mixed dentition and ermanent tooth buds. Before the virtual reduction, we create our cylinders (2.0 mm in diameter) on the mandible (Fig. 1). his is to allow us to position fixation screws precisely and

Three Dimensional Analysis of Primary Maxillary Central and Lateral Anterior Zirconia Crown

This study was performed to compare the shape and dimension of anterior zirconia crowns to other pediatric crowns using a three-dimensional scanner to investigate adequate amount of tooth preparation. Primary central and lateral anterior zirconia crowns, stainless steel crowns and celluloid strip crowns were scanned by a three-dimensional scanner. Outer and inner surfaces of zirconia and stainless steel crowns, and outer surface of celluloid strip crowns were analyzed. In outer scanned images, all sizes of central and lateral size 1 zirconia crown had the largest labiolingual diameter among the three crowns. In inner scanned images, zirconia crown`s mesiodistal diameter was 0.7-1.0 mm smaller and crown length was approximately 1 mm shorter than those of stainless steel crowns. Zirconia crown`s labiolingual diameter was larger in central crowns whereas it was smaller in lateral crowns than that of stainless steel crowns. Recommended preparation required for zirconia crown is incisal 2.5-3.0 mm, mesiodistal 1.5-2.0 mm, labial 0.5-1.0 mm. Cingulum should be trimmed parallel to the long axis. No more lingual reduction is needed in central incisors whereas additional 0.5 mm reduction is suggested in lateral incisors.

Analysis of 269 Cases of Jaw Cysts in Children and Adolescents: A Retrospective Study over a Decade

This study aimed to identify the characteristics of jaw cysts among children and adolescents treated at the Kyung Hee University Dental Hospital from 2005 to 2015. A retrospective observational study was conducted of 269 jaw cysts diagnosed in 253 patients. The following variables were recorded: gender, age, prevalence and location of lesions, clinical symptoms and treatment. Statistical analyses were performed using the SPSS (version 20.0). Our results suggest that the cysts are slightly more prevalent in males. Cystic lesions of the jaws in children are predominantly odontogenic and developmental in origin. Dentigerous cysts predominate in developmental cysts and the most frequent diagnosis is radicular cysts in inflammation cysts. The most common location of the cysts is in the mandible, particularly the lower molar region. In numerous cases, the patients have no clinical symptoms. Most cysts were surgically enucleated with tooth extraction. Furthermore, our findings demonstrate that the characteristics of jaw cysts in children are distinctive and differ in several respects from the corresponding distribution of jaw cysts in adult population. Therefore, knowledge of the clinical, radiological and histopathological behavior of jaw cysts and periodic radiographic examination are key factors for early diagnosis and adequate treatment of jaw cysts in children.

Comparison of Dental Outcomes after General Anesthesia According to the Follow-up Pattern in Special Health Care Needs Patients

Special Health Care Needs (SHCN) patients need regular follow-up because of high incidence and severity of oral disease. The aim of this study was to evaluate the dental treatment outcomes of SHCN patients according to follow-up patterns. SHCN patients who were treated under general anesthesia (GA) at Kyung Hee University Dental Hospital from 2006 to 2014 were included in this study. The final samples comprised of 53 patients that were divided into regular (33 patients) and irregular (20 patients) follow-up groups according to their follow-up patterns. The type of dental treatment after GA during the follow-up periods were compared. In the irregular group, aggressive treatment including endodontic, prosthetic treatment, and extraction were predominant, compared with the regular group (p

Minimally Invasive Surgery in a Pediatric Palatal Plasmacytoid Myoepithelioma

Myoepithelioma is a rare disease in the salivary gland. Myoepithelioma is more common in adults than in children or adolescents. An 8-years-old female patient visited our clinic with a chief complaint of a painless swelling on the palate. Conservative treatment that preserves the overlaying palatal mucosa while surgically excising the tumor was carried out under general anesthesia, because the patient was young and the size of the tumor was relatively large. The surgical wound healed well and there had not been any sign of recurrence during the regular follow-up period of 40 months. Minimally invasive surgical treatment which preserves peripheral palatal tissue can be useful in a pediatric myoepithelioma.

Predictive Factors of Ectopic Eruption of the Maxillary First Permanent Molar

In order to provide a diagnostic basis for predicting the possibility of the self-correction of ectopic first permanent molars, differences among normal eruption, reversible and irreversible ectopic eruption of maxillary first permanent molars were retrospectively analyzed. The angles of the long axes and the occlusal lines between the maxillary first permanent molar and the adjacent tooth were measured by panoramic radiographs. The occlusal relationship of second primary molars was also investigated. There is a statistically significant difference between the ectopic eruption group and normal group (p < 0.05), but not between the reversible and irreversible ectopic eruption groups (p > 0.05). The angles between the second primary molar and the first permanent molar, the second primary molar and the second permanent molar in ectopic groups showed a smaller degree than those of the control group. Mesial step was found more frequently in the ectopic eruption group than the normal group. In conclusion, the angulation of the first permanent molar and tooth germ of the maxillary second permanent molar showed close relation with ectopic eruption of the maxillary first permanent molar and ectopic first permanent molar is likely to occur in class III patients with maxillary deficiency.

Management of Premature Loss of Primary Molars with Flexible Denture

Early loss of a primary second molar can cause mesial drift or tilting of the permanent first molar. We present a case of the early loss of the mandibular primary molars in a 5-year-old girl. The patient required extraction of the mandibular left primary first and second molars due to folliculitis on the successors. A flexible denture was used for eruption guidance of the permanent first molar and the recovery of masticatory function simultaneously.