• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제41권2호
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• pp.109-115
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• 2015

Odontoma is the most common odontogenic benign tumor, and the treatment of choice is generally surgical removal. After excision, bone grafts may be necessary depending on the need for further treatment, or the size and location of the odontoma. Although the osteogenic capacity of a demineralized tooth was verified as early as 1967 by Urist and many other investigators, the cumbersome procedure, including a long demineralization time, may be less than comfortable for clinicians. A modified ultrasonic technology, with periodic negative pressure and temperature control, facilitated rapid and aseptic preparation of demineralized teeth for bone grafts. This approach reduces the demineralization time dramatically (${\leq}80$ minutes), so that the graft material can be prepared chairside on the same day as the extraction. The purpose of this article is to describe two cases of large compound odonotomas used as graft material prepared chairside for enucleation-induced bony defects. These two clinical cases showed favorable wound healing without complications, and good bony support for future dental implants or orthodontic treatment. Finally, this report will suggest the possibility of recycling the benign pathologic hard tissue as an alternative treatment option for conventional bone grafts in clinics.

• 대한치과교정학회지
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• 제26권5호
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• pp.637-645
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• 1996

성장이 완료된 골격성 III급 부정교합의 치료는 골격 부조화의 심도, 절치 치축, overbite와 연조직 측모의 심미성 등을 고려하여 필요한 경우 교정치료와 악교정수술을 병행하여 골격과 치아관계 개선에 따른 기능의 증진외에도 안모의 심미성을 증진시킬 수 있다. 특히 전후방적, 수직적, 횡적인 골격 부조화가 크거나 안면비대칭이 있는 경우, 또한 악교정수술후의 안정성이나 보다 이상적인 안모를 위하여 양악수술을 시행한다. 중안면부 함몰환자에서 안와하연과 관골부는 보존하며 비상악체를 전방이동하는 pyramidal Le Fort II osteotomy 를 시행할 수 있으며, 안와하연과 관골부치 전방이동을 필요로 할 때는 quadrangular Le Fort II osteotomy 를 시행할 수 있다. 이 수술법은 안와하연의 위치를 변화시켜 안와체적에 영향을 미치므로 상악골의 횡적, 수직적 이동량이 5 mm 이상일 때는 시행할 수 없다. 서울대학교병원 치과진료부 교정과에 내원하여 중안면부 함몰과 하악전돌을 동반한 골격성 III급 부정교합으로 진단되어 교정-악교정수술 (Le Fort II osteotomy 와 BSSRO) 복합치료를 받은 2명의 환자에 대해 살펴보고자 한다.

• 대한치과교정학회지
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• 제22권4호
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• pp.815-822
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• 1992

Orthodontists want why the patients want orthodontic treatment. Demand and need for orthodontics is very important factors of cooperation and management. Chief complaint would be different according to the race and culture. Our results show that in the control group, Korean female adolescents[chief complaint is cowding$(30.6\%)$, spacing$(26.5\%)$, upper anterior protrusion$(18.4\%)$, anterior cross bite$(8.2\%)$ in order. Korean female adolescents considered anterior cross bite is more nonacceptable than spaeing and anterior protrusion. The purpose of orthodontics seemed to enhance esthetic, dental health, and to improve oral function.

• 대한치과교정학회지
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• 제42권5호
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• pp.270-278
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• 2012

In the correction of dental Class III molar relationship in skeletal Class II patients, uprighting of the mandibular posterior segments without opening the mandible is an important treatment objective. In the case reported herein, a C-tube miniplate fixed to the lower labial symphysis and connected with a nickel-titanium reverse-curved archwire provided effective uprighting of the lower molars, without the need of orthodontic appliances on the mandibular anteriors. Using this approach, an appropriate magnitude of force is exerted on the molars while avoiding any negative effect on the mandibular anteriors.

• 대한치과교정학회지
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• 제14권1호
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• pp.33-37
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• 1984

The prevalence of normal occlusion and malocclusion was assessed by Angle's Classification method for 8989 school students at 7-22 years in Seoul. The occurrence of malocclusion and the need-for orthodontic treatment was 61 per cent among them. Results indicated no significant differences between the sexes for the occlusal relationships of the mandible to the maxille. The prevalence of Class I, Class II, and Class III malocclusion in all malocclusion was shown to be Class I, 45.7 per cent; Class II, 7.6 per cent; and Class III, 7.9 per cent. Class II Division 1 was observed to occur four times frequently compared to Class II Division 2 in Class II malocclusions. Class III malocclusion was shown to occur more frequently compared that of Caucasians.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.280-286
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• 2024

In this paper, layered UNet with warmup and dropout tricks was used to segment teeth instantly by using data labeled for each individual tooth and increase performance of the result. The layered UNet proposed before showed very good performance in tooth segmentation without distinguishing tooth number. To do instance segmentation of teeth, we labeled teeth CBCT data according to tooth numbering system which is devised by FDI World Dental Federation notation. Colors for labeled teeth are like AI-Hub teeth dataset. Simulation results show that layered UNet does also segment very well for each tooth distinguishing tooth number by color. Layered UNet model using warmup trick was the best with IoU values of 0.80 and 0.77 for training, validation data. To increase the performance of instance segmentation of teeth, we need more labeled data later. The results of this paper can be used to develop medical software that requires tooth recognition, such as orthodontic treatment, wisdom tooth extraction, and implant surgery.

• 대한치과교정학회지
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• 제44권2호
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• pp.96-102
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• 2014

Objective: A recent study suggested that rs6504340, a polymorphism within the homeobox B (HOXB) gene cluster, is associated with the susceptibility for malocclusions in Europeans. The resulting malocclusions require orthodontic treatment. The aim of this study was to investigate the association of rs6504340 and other dentition-implicated polymorphisms with dental and occlusal traits in Korean and Japanese populations. Methods: The study participants included 223 unrelated Koreans from the Busan area and 256 unrelated Japanese individuals from the Tokyo metropolitan area. DNA samples were extracted from saliva specimens. Genotyping for rs6504340 and four single nucleotide polymorphisms (SNPs) that have been shown to be associated with the timing of first tooth eruption and the number of teeth at 1 year of age (rs10506525, rs1956529, rs9674544, and rs8079702) was performed using TaqMan assays. The Index of Orthodontic Treatment Need (IOTN), overjet, overbite, arch length discrepancy, crown sizes, and length and width of the dental arches were measured. Spearman's correlation coefficients were calculated to evaluate relationships between rs6504340 and these dental/occlusal traits. Results: We evaluated the aesthetic components and dental health components of the IOTN in the Korean and Japanese populations and found that neither rs6504340 nor the other four SNPs showed any association with dental and occlusal traits in these East Asian populations. Conclusions: These negative results suggest that further research is needed to identify the genetic determinants of malocclusions in order to reach a consensus.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제37권
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• pp.29.1-29.7
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• 2015

Facial asymmetry is found in patients with or without cosmetic facial alterations. Some patients have facial asymmetry that manifests underlying skeletal problems, while others have only limited soft-tissue facial asymmetry. Orthognathic surgery brings about a dermatic change, as soft tissue covers underlying bones. Limited soft-tissue asymmetry, meanwhile, is difficult to correct. The treatment modalities for the creation or restoration of an esthetically pleasing appearance were autogenous fat grafts, cartilage graft, and silicon injections. A young female patient had right-side facial asymmetry. The clinical assessment involved visual inspection of the face and palpation to differentiate soft tissue and bone. Although the extra-oral examination found facial asymmetry with skin atrophy, the radiographic findings revealed no mandibular atrophy or deviation. She was diagnosed as localized scleroderma with muscle spasm. In conclusion, facial asymmetry patients with skeletal asymmetry can be esthetically satisfied by orthognathic surgery; however, facial atrophy patients with skin or subdermal tissue contraction need treatment by cosmetic dermatological surgery and orthodontic correction.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제28권6호
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• pp.440-455
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• 2002

The final goal for an orthognathic surgery is a functional and esthetic achievement based on occlusion theory. All the dental treatment should be done with the occlusion in mind, though, they tend to be ignored with no good reason. We cannot think of occlusion without temporomandibular joint because it is the first clue to define an occlusion. As normal occlusion comes from the central tendency of distribution of population, we can get it by examining the population that closely meet the criteria of ideal occlusion. To perform proper occlusal function and to maintain the stability after treatment, the case must be finished in normal occlusion closer to ideal one. Our aim is to achieve the ideal occlusal scheme like the mutually protected occlusion with the best masticatory efficiency and the stability. The facial esthetics are influened by culture, race and the time in which human live. While the occlusal function rarely changes as time goes by, esthetics tend to do from one country to another. Orthodontists and maxillofacial surgeons should have solid sets of treatment goals to achieve the best facial esthetics and the ideal occlusion dictated by the joint. Doing orthognathic surgery, two factors aforementioned should be taken into account to establish the Surgical Treatment Objectives(STO). The doctors who are planning orthognathic surgery need to have a very logical and systematic thought process to make STO. The author examined 28 selected beautiful Korean female adults with normal skeleton with normal occlusion and analyzed the hard and the soft tissue relationship into five parts : dentomaxillary relationship, intermaxillary relationship, posture to hard tissue relationship, facial balance, and posture to soft tissue relationship. This study presents a sequential flow of diagnosis and treatment planning especially for surgical patients and it also can be applied to the nonsurgical patients.

• 대한치과교정학회지
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• 제33권1호
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• pp.63-72
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• 2003

최근 치의학이 눈부시게 발전하고, 소득이 증가하면서 이에 따라 일반인의 의식이 점차 변하면서 외모에 대한 관심도도 점차 높아지고 있다. 본 연구는 내원환자의 부정교합의 유형, 치료방법의 변화를 파악하여 내원환자와 보다 적절한 의사소통을 위한 정보를 제공하고, 교정치료 요구의 특성을 파악하여 부정교합의 역학적 자료를 제공하고자 본 연구를 시행하였다. 이를 위해 2002년 상반기와 1992년 상반기에서 울대학교 치과병원 교정과에 내원한 환자 중 진료기록부가 잘 보존된 676명을 대상으로 하여 부정교합의 유형과 내원 환자의 지역분포 및 주소의 변화, 치료방법의 변화를 조사 연구한 결과 다음과 같은 결론을 얻었다. 1 내원 환자의 남녀 비율은 1992년 1:2.1에서 2002년 1:1.5로 남자환자가 많이 증가했음을 알 수 있다. 2. 연령별 내원 환자의 분포에서 2002년에는 7세에서 12세군이 $32.0\%$로 가장 높게 나타났으며, 그 다음으로는 19세에서 24세군이 $24.0\%$, 13세에서 18세군이 $21.6\%$, 25세 이상군이 $14.2\%$, 4세에서 6세군이 $5.8\%$, 0세에서 3세군이 $2.4\%$로 가장 낮았다. 1992년도 내원 환자의 연령 분포와 비교시 성인 환자의 비중이 증가하였다. 3. Angle분류법에 의한 내원환자의 분포에서 2002년에는 III급 부정교합이 $48.1\%$로 가장 높게 나타났으며, I급 부정교합이 $25.0\%$, II급 1류 부정교합이$20.9\%$, II급 2류 부정교합이 $3.4\%$로 나타났다. 4. 내원환자의 지역별 분포에서 서울 북동지역의 환자가$37.0\%$, 서울 남동지역이 $13.2\%$, 서울 남서지역이 $12.3\%$, 서울 북서지역의 환자가 $5.5\%$로 나타났다. 1992년도와 비교시 서울 북동지역환자의 내원 비율이 종가하고 그 외 지역 내원 환자의 비율은 감소한 것으로 나타났다. 5. 주소(chief complaint)별 내원 환자의 분포는 2002년에 하악 전돌이 $17.5\%$로 가장 높게 나타났으며, 크라우딩이 $14.2\%$, 안면 비대칭이 $11.8\%$로 나타났다. 1992년의 주소별 내원 비율과 비교시 안면 비대칭을 주소로 내원한 환자의 비율이 유의하게 증가하였고, 내원 동기가 매우 다양해졌다. 5. 2002년도 내원 환자의 치료방법은 고정식 장치가 $38.0\%$, 악교정 수술이$25.0\%$, 성장 관찰이 $13.0\%$로 나타났다. 1992년도와 비교시 chin cap의 사용이 줄었으며, 상대적으로 악교정 수술과 성장관찰을 요하는 환자의 비중이 유의할만하게 증가하였다