Orthodontic treatment combined with autotransplantation after removal of ameloblastoma

This article describes the use of indirect skeletal anchorage and autotransplantation in a patient who had an ameloblastoma removed. The mandibular left second and third molars were also extracted. Autogenous bone was grafted after surgical removal of the ameloblastoma, and the mandibular right third permanent molar was transplanted into the extraction space. Orthodontic treatment included a miniscrew to bring the transplanted tooth into good occlusion. Four years after treatment, the patient continued to show good results, with no recurrence of the ameloblastoma

간접 골성 고정원을 이용한 골격성 III급 부정교합의 절충 치험례

Treatment of adult patients with Class Ⅲmalocclusion frequently requires a combined orthodontic and surgical approach. However, if for various reasons, nonsurgical orthodontic treatment is chosen, a stable outcome requires careful consideration of the patient's biologic limitation. This case presents the orthodontic treatment of an adult with a Class Ⅲ malocclusion, which was treated nonsurgically using indirect skeletal anchorage. 성인에서의 골격성 Ⅲ급 부정교합의 치료의 원칙은 하악골의 후방이동을 동반한 수술적 교정치료이나, 다양한 문제로 인해 수술적 방법을 선택하기 어렵고 부조화의 정도가 심하지 않은 환자의 경우 비수술적 절충 치료를 선택할 수 있다. 비수술적 절충치료를 시행하는 경우 교정치료의 한계와 치주적인 부분에 대한 주의가 필요하다. 본 교실에서는 간접 골성 고정원을 이용하여 성인에서의 골격성 Ⅲ급 부정교합을 비수술적으로 절충 치료 하였기에 보고하고자 한다

간접 골성 고정원을 이용한 골격성 Ⅲ급 부정교합의 절충 치험례

Treatment of adult patients with Class III malocclusion frequently requires a combined orthodontic and surgical approach. However, if for various reasons, nonsurgical orthodontic treatment is chosen, a stable outcome requires careful consideration of the patient`s biologic limitation. This case presents the orthodontic treatment of an adult with a Class III malocclusion, which was treated nonsurgically using indirect skeletal anchorage. 성인에서의 골격성 Ⅲ급 부정교합의 치료의 원칙은 하악골의 후방이동을 동반한 수술적 교정치료이나, 다양한 문제로 인해 수술적 방법을 선택하기 어렵고 부조화의 정도가 심하지 않은 환자의 경우 비수술적 절충 치료를 선택할 수 있다. 비수술적 절충치료를 시행하는 경우 교정치료의 한계와 치주적인 부분에 대한 주의가 필요하다. 본 교실에서는 간접 골성 고정원을 이용하여 성인에서의 골격성 Ⅲ급 부정교합을 비수술적으로 절충 치료 하였기에 보고하고자 한다

하악의 교정용 미니 임플랜트 식립 부위에서의 피질골 두께와 치근간 거리: 3차원으로 재구성한 CT 영상을 이용한 연구

Objective: The purpose of this study was to provide clinical guidelines to indicate the best location for mini-implants as it relates to the cortical bone thickness and root proximity. Methods: CT images from 14 men and 14 women were used to evaluate the buccal interradicular cortical bone thickness and root proximity from mesial to the central incisor to the 2nd molar. Cortical bone thickness was measured at 4 different angles including 0 degrees, 15 degrees, 30 degrees, and 45 degrees. Results: There was a statistically significant difference in cortical bone thickness between the second premolar/first permanent molar site, central incisor/central incisor site, between the first/second permanent molar site and in the anterior region. A statistically significant difference in cortical bone thickness was also found when the angulation of placement was increased except for the 2 mm level from the alveolar crest. Interradicular spaces at the 1st/2nd premolar, 2nd premolar/1st permanent molar and 1st/2nd permanent molar sites are considered to be wide enough for mini-implant placement without root damage. Conclusions: Given the limits of this study, mini-implants for orthodontic anchorage may be well placed at the 4 and 6 mm level from the alveolar crest in the posterior region with a 30 degrees and 45 degrees angulation upon placement. (Korean J Orthod 2008; 38(6):397-406)

Treatment of ankylosed mandibular first permanent molar

This report describes the treatment of a 21-year old patient with an ankylosed mandibular right first permanent molar. The tooth was noticeably infraoccluded when the patient was first seen, at age 9. Over the next 11 years, several interventions, as well as periods of observation, were undertaken to bring the infraoccluded tooth into occlusion. This was finally accomplished by using a microscrew implant. The final treatment and the treatment procedures during the adolescent period are reported here

Analysis on the Accuracy of Intraoral Scanners: The Effects of Mandibular Anterior Interdental Space

In this study, we evaluated the effects of mandibular anterior interdental space on the accuracy of intraoral scanners. Four models of mandibular arch with varying distances of anterior interdental space were analyzed; incisors were evenly spaced out between the two canines by 0 mm, 1 mm, 3 mm, and 5 mm. The full arch of each model was scanned 10 times with iTero® and Trios®. The images were superimposed with those from the reference scanner (Sensable S3) and compared using Geomagic Verify. Statistical analysis was conducted using a t-test, paired t-test, and one-way analysis of variance (ANOVA). Differences in the accuracy of images were statistically significant according to both iTero® and Trios®; a greater deviation was noted with increasing anterior interdental space (p < 0.05). Upon dividing the lower arch into five sections, larger deviation was observed with iTero® in the molar area, except in the model with 1 mm space. With Trios®, the largest deviation was observed in the right molar area in all models. The maximum deviations of intermolar width were 0.66 mm and 0.76 mm in iTero® and Trios®, respectively. This comparison suggests that Trios® demonstrates a higher accuracy than iTero® in all models and in all sections of the arch. However, the mean deviations indicate that both iTero® and Trios® are clinically acceptable

A descriptive tissue evaluation at maxillary interradicular sites: Implications for orthodontic mini-implant placement

Few studies have evaluated interradicular anatomy for hard and soft tissue thickness. Because interradicular sites are common regions for mini-implant placement for orthodontic anchorage, the purpose of this study was to provide a guideline to indicate the best location for mini-implants as it relates to the thickness of cortical bone and soft tissue, and to the height of the attached gingival field. CT images from 15 men and 15 women (mean age 27 years, range 23-35 years) were used to evaluate the buccal interradicular cortical bone thickness from and mesial to the central incisor to the 1st molar. To record soft tissue depth at the site of assessment for cortical bone thickness, the mucosa was pierced with a #15 endodontic K-file until the attached rubber stop rested on the mucosa. The height of attached gingiva was measured at the mid-aspect of each tooth using a caliper. There were no significant differences in cortical bone thickness within interradicular sites except for the 2nd premolar/1st molar site. There were also no significant differences in soft tissue thickness within interradicular sites except for the lateral incisor/canine and 2nd premolar/1st molar sites. The height of attached gingiva was greater in the anterior compared to the posterior region and was shortest in the premolar region. Given the limits of this study, mini-implants for orthodontic anchorage may be well placed with equivalent bone-implant contact anywhere within the zone of attached gingiva up to 6 mm apical to the alveolar crest with adequate interradicular space

Scissors-bite correction on second molar with a dragon helix appliance

Many efforts have been made to correct scissors-bite and establish proper molar interdigitation for prosthetic or orthodontic treatment. The critical procedures for scissors-bite correction are intruding and palatally tipping the involved tooth when it is both extruded and buccally flared. Conventional approaches give rise to problems such as repetitive bonding failure and loss of anchorage. A newly designed spring, the dragon helix appliance, is used with an indirect skeletal anchorage system to correct scissors-bite. This spring provides effective tooth movement and the convenience of a simple and small design. We report a successful treatment with the dragon helix

B. Sc. Degree Programme

Objectives: To evaluate palatal bone density to allow for better selection of palatal implant anchorage sites. Materials and Methods: Computed tomographic (CT) images were obtained from 15 males and 15 females (mean age, 27 years; range, 23–35 years). Bone density was measured in Hounsfield units (HU) at 80 coordinates at regular mediolateral and anteroposterior intervals along the midpalatal suture. Results: Bone densities ranged from 805 to 1247 HU. A significant difference between male and female groups was noted, although no difference was found between left and right sides of individual palates. Palatal bone densities showed a tendency to decrease laterally and posteriorly. The midpalatal area within 3 mm of the midsagittal suture had the densest bone in the entire palate. Conclusion: Results suggest that mini-implants for orthodontic anchorage may be effectively placed in most areas with bone density equivalent to the palatal area if they are placed from 3mm posterior to the incisive foramen and 1 to 5 mm to the paramedian side. (Angle Orthod. 2010;80:137–144.

Three-dimensional analysis of tooth movement after intrusion of a supraerupted molar using a mini-implant with partial-fixed orthodontic appliances

Objective: To evaluate three-dimensional (3D) positional changes of an intruded tooth, a neighboring tooth, and a tooth connected to a mini-implant following intrusion of a single supraerupted molar, using a mini-implant with partial-fixed orthodontic appliances.Materials and Methods: The study consisted of 14 adult patients (two males and 12 females, mean age 41.9 years) with a supraerupted molar due to loss of an antagonist. Intrusion was performed using a mini-implant with a partial strap-up. The mean treatment time was 11.9 months, and the mean retention time was 23.3 months. To quantify the positional changes of the teeth, 3D models using a laser-based, dental scanning system and 3D software at pretreatment, posttreatment, and retention were oriented in a coordinate system and superimposed using nonmoved teeth as references. The changes on the x-, y-, and z-axes were measured at the tip of each cusp in the involved teeth.Results: A supraerupted molar was intruded by a mean amount of 1.35 +/- 0.48 mm and was well maintained during the retention period. The overall change in the neighboring tooth was insignificant, although it showed opposite movement compared to the intruded tooth during the intrusion. The tooth connected to a mini-implant exhibited a secure anchorage.Conclusion: 3D analysis showed the detailed positional changes of each tooth, and the involved molars were well maintained after intrusion. (Angle Orthod. 2013;83:274-279.)OAIID:oai:osos.snu.ac.kr:snu2013-01/102/0000030821/4SEQ:4PERF_CD:SNU2013-01EVAL_ITEM_CD:102USER_ID:0000030821ADJUST_YN:YEMP_ID:A076080DEPT_CD:861CITE_RATE:1.207FILENAME:2013 03월 ao 임원희 intrusion.pdfDEPT_NM:치의학과EMAIL:[email protected]_YN:YCONFIRM: