Unexpected Bleeding Following Endoscopic Sinus Surgery Leading to the Rare Diagnosis of Acquired Haemophilia A / 대한이비인후과학회지

We report a case of acquired hemophilia A following endoscopic sinus surgery. The patient was a 64-year-old man whose preoperative activated partial thromboplastin time (aPTT) was slightly prolonged. He underwent endoscopic sinus surgery for chronic rhinosinusitis with nasal polyp. Nasal bleeding occurred spontaneously on the postoperative day 3. The aPTT was prolonged at 58.9 s, with factor VIII activity of 21% and a positive factor VIII inhibitor. Treatment with factor VIII and methylprednisolone resulted in remission within 1 month. This is the first of such case reported in Korea; the patient was treated by recombinant factor VIII replacement and steroid therapy.

Interdisciplinary treatment of Class III malocclusion using mini-implant: problem-oriented orthodontic treatment / 대한치과교정학회지

Interdisciplinary treatment of Class III malocclusion with congenital missing of unilateral maxillary canine and anterior crossbite is discussed focusing on a problem-oriented treatment planning, treatment progress, and treatment result. Maxillary mini-implant provided anchorage for distalization of the maxillary right porsterior dentition. Mandibular mini-implants were used to distalize the whole mandibular dentition. Total treatment time was 17 months to achieve a successful treatment goal. Stable occlusion was maintained after 12 months of retention.

Surgical orthodontic treatment of skeletal Class III malocclusion using mini-implant: correction of horizontal and vertical dental compensation / 대한치과교정학회지

Treatment of skeletal Class III malocclusion with mini-implant anchorage is discussed in relation to vertical control of the maxillary posterior dentoalveolar region and horizontal control of mandibular anterior teeth. A midpalatal mini-implant provided anchorage for intruding the maxillary posterior teeth. Mandibular mini-implant implants were used to bring about labioversion of mandibular anterior teeth. After mandibular setback surgery, improvement of the facial profile was obtained both horizontally and vertically. Total treatment time was 11 months. Stable occlusion was maintained after 18 months of retention. The effectiveness and efficacy of mini-implants for the treatment of skeletal Class III malocclusion are also discussed.

Spacing and crowding of the primary dentition in Korean children - relationship to tooth sizes and dental arch dimension / 대한치과교정학회지

The aims of this study were to investigate the prevalence of spaced, closed, and crowded primary dentitions by sex and arch in Korean children from Kanghwa, and to determine the frequency of the primate and developmental spaces. The differences in the mesiodistal crown diameters and the arch dimensions between the spaced, closed, and crowded primary dentitions were also evaluated. Dental casts of 102 preschool children (57 males and 45 females, aged 4 ~ 5 years) were studied. The prevalence of spacing in the primary dentition was 63.2% in males and 57.8% in females. The frequency of spacing was greater in males than in females, and greater in the maxillary arch than in the mandibular arch. The crowns were significantly larger and the arches significantly narrower in closed and crowded dentitions than in those with spacing (p < 0.05). The results showed that the prevalence of spacing was lower than that found in previous studies and the presence of spacing in the anterior region was related to the mesiodistal crown diameter and the intercanine width.

Current trends in orthodontic patients in Seoul National University Dental Hospital / 대한치과교정학회지

Over the past decades, the number of patients seeking orthodontic treatment has increased markedly with socioeconomic development and change of recognition on appearance. The purpose of this study was to provide an epidemiologic data base related to the orthodontic treatment need. We could take an adequate information regarding the characteristics of orthodontic patients, and the changing trends about treatment mordality. Distrubution and treands were investigated in 676 patients who had been examined and diagnosed at Department of orthodontics, Dental Hosital, Seoul National University from January to June in 1992 and 2002. 1. Sex distribution of patients changed from 1 : 2.1 to 1 : 1.5 (male : female). 2. In 2002, age distribution had shown 7~12 year-old group being the largest (32.0%) and percentage of 19~24, 13~18, over 25, 4~6, 0~3 year-old group were 24.0%, 21.6%, 14.2%, 5.8%, 2.4% respctively. Compared with data in 1992, the number of adult patients highly increased. 3. With regard to Angle classification, each percentage of Class I , Class II div 1, Class II div 2, and Class III malocclusion were 25.0%, 20.9%, 3.4%, and 48.1% respectively in 2002. 4. Geographic distribution showed that most of the patients visited (37.0%) lived in northeast of Seoul in 2002. 5. Mandibular prognathism showed the highest percentage in chief complaints. The percentages of crowding and facial asymmetry were 14.2% and 11.8% in 2002. Patients with facial asymmetry increased significantly. 6. Percentages of patients treated with fixed appliance and orthognathic surgery were 38.0% and 25.0% in 2002. Patients needed to observe the growth pattern comprised 13.0% with increasing trends. The use of chin cap reduced and the percentage of orthognathic surgery and growth observation increased significantly.

The treatment of an ankylosed canine: Luxation and forced eruption / 대한치과교정학회지

This paper outlines the case of a 56 year-old man undertaking treatment by means of luxation and forced eruption of an ankylosed canine. At the time of diagnosis, the ankylosis of the tooth was not suspected, because there were not signs of intrusive luxation nor horizontal diaplacement. Only after the application of a vertical elastic force failed to erupt the maxillary left canine, was the ankylosis of that tooth suspected. At the time of reevaluation, the maxillary left canine hads no physiologic tooth mobility and emitted a sharp, ringing sound upon percussion. Hence, the maxillary left canine was considered ankylosed. The treatment course then changed to the extrusion of the canine through the surgical luxation of the tooth and the prompt application of vertical extrusive forces. The above outcome was successful for the patient not only in the orthodontic aspect, but also in terms of the periodontal considerations.

A Study on the mandibular setback osteotomy and reduction genioplasty in mandibular prognathism with long anterior facial height / 대한치과교정학회지

The purpose of this study was to evaluate the amount and interrelationship of hard and soft tissue changes after mandibular setback osteotomy and reduction genioplasty in mandibular prognathism with long anterior facial height. The control group (Group A) consisted of 20 patients who had severe horizontal discrepancy. They experienced presurgical orthodontic treatment and orthognathic surgery via mandibular setback. The experimental group (Group B) consisted of 20 patients who had severe horizontal and vertical discrepancy. They experienced presurgical orthodontic treatment and orthognathic surgery via mandibular setback and reduction genioplasty. The presurgical and postsurgical lateral cephalograms were valuated. The computerized statistical analysis was carried on with EXCEL 97 program. The results were as follows : 1. The correlation of hard and soft tissue horizontal changes in lower 2/3 of lower anterior facial height were high for both groups. The correlation coefficients of hard tissue changes and Ls, Stm, Li changes in group B were moderately higher than Group A. 2. The correlation of hard and soft tissue vertical changes in Group B were lower than Group A. (except for pointB-Ils, Me-Me') 3. The ratio for soft tissue to Pog in Group B was lower than Group A. The ratios of hard and soft tissue vertical changes were 32% at Ils, 54% at Pog', and 60% at Me'. 4. The ratio of lower anterior facial height to total anterior facial height was reduced for both group. But ratio of upper 1/3 of lower anterior facial height to total anterior facial height did not changed significantly in Group B. 5. Reduction genioplasty combined with mandibular setback procedure showed no change in upper one third(Sn-Stm) and significant decrease(Stm-Me') in the lower two thirds of the soft-tissue anterior lower facial height.

The effect of chlorhexidine varnish application on the shear bond strength of orthodontic brackets / 대한치과교정학회지

The purpose of this study was to determine whether the application of chlorhexidine varnish affects the shear bond strength and failure pattern of orthodontic brackets or not. The experimental group consisted of 22 human premolars which extracted after chlorhexidine varnish application (4 times for 1 week interval) in vivo, and the control group consisted of 22 human premolars which extracted without any pre-treatment. After all teeth wee etched with 37% phosphoric acid gel, metal orthodontic brackets (Q-3002, RMO, USA) were bonded to each tooth using auto-polymerizing orthodontic resin (Ortho-One, Bisco, USA) with the same bonding procedure. The shear bond strength was measured with Instron universal testing machine (model 4466, Instron Ltd., England), and the failure pattern of each bracket was examined with Scanning Electron Microscope (SM 840A, JEOL, Japan). The data were analysed statistically with t-test. The results were as follows: 1. Application of chlorhexidine varnish had no significant effect on the shear bond strength of the orthodontic bracket. 2. There was no significant difference in the failure pattern of orthodontic bracket between the experimental group and the control group.