• Journal of Oral Medicine and Pain
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• 제23권4호
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• pp.457-473
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• 1998

This study was performed to investigate the morophological and positional correlation between the upper cervical vertebra, the oral structures and the pharyngeal tissues, and the correlation of these anatomical structures with dental features, such as teeth wear area nad tooth contact status, etc. Seventy patients with temporamandibular disorders and sixty three dental students without any signs and symptoms in head and neck region were selected for this study. All they had natural dentition without any fixed and removable protheses. Teeth wear area and arch width wre measured from the upper dental cast, tooth contact status were observed by T-Scan system$^\textregistered$ and four cephaloradiograpohs were taken from four head postures, namely, natural(NHP), forward(FHP), upward(UHP), and downward head postiure(DHP). 22 cephalometric items were measured on the films and the data were processed with SAS statistical program. The result of this study were as follows : 1. In normal group, angle of cervical vertebra tangent and of between hard and soft palate were broader in female subjects than those in male subjacets, but distance from subocciput to axis, size of soft palate, and pharyngeal space width were larger in male subjects. 2. In normal group with natural head posture, the items correlated each others from the three anatomical regions were distance between first nad second vertebra in posterior part, distance from the lingual surface of lower anterior teeth to anterior surface of soft palate, and distance from the hyoid bone to third vertebra. 3. Three set of items showed significant correlation each other in the four head postures in normal group. First set was the angle between hard and soft palate and the idstance from subocciput to posterior arch of first vertebra, second set was the distance between first and second vertebra in posterior part and the teeth wear area, third set was number and force of tooth contact and length of soft palate and distance from anterior tip of hyoid bone to mandibular plane.

• 대한치과의사협회지
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• 제58권2호
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• pp.103-113
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• 2020

Background: Reduction malarplasty is one of the most popular facial contouring surgeries in east Asia for making patients' faces smaller. Currently in Korea, reduction malarplasty surgeries are performed mostly at plastic surgery clinics, but few cases are done at oral and maxillofacial surgery clinics. The reason might be because of post-operative complications after reduction malarplasty, such as undercorrection, overcorrection, asymmetry, cheek drooping, malunion, pain and noise. Those complications should be uneasy to be handled by oral and maxillofacial surgeons, however, they can be prevented by knowing the effective and safe reduction malarplasty techniques. Therefore, in this article the author as an oral and maxillofacial surgeon, would like to suggest safe and effective surgical methods for reduction malarplasty customized for Korean patients. Method: L- shape osteotomy of zygomatic body was performed with intraoral approach via vestibular incision, and the zygomatic arch was osteotomized with extraoral approach via sideburn incision. Then zygomatic complex was separated and rotated mesio-superiorly without removal of a bony strip and fixed with miniplates and microplates without making a bony gap. Conclusion: Surgical results were favorable and satisfied by the patients without cheek drooping, malunion, undercorrection and asymmetry.

• 대한치과보철학회지
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• 제35권3호
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• pp.535-543
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• 1997

In order to compare the accuracy of impression technique using the addition silicone putty and improved heavy body material, impression were taken for the natural 6 maxillary anterior teeth, and for the metal mast model that has full arch shape with 4 cylindrical abutment teeth. Marginal gingiva was retracted by routine method using retraction cord, and two techniques were tried to compare the length of impression materials in the gingival sulcus. This was aimed to see the effect of viscosity and hydraulic pressure of impression materials for the subgingival impression. Impressions for the full arch-shaped metal master model were taken to compare the linear stability of the different impression materials and their related techniques. The conclusions were as belows : 1. The one-step impression technique showed longer extension of impression material in gingival sulcus than two-step impression technique. 2. High viscosity and hydraulic pressure of impression material were useful to take subgingival impression. 3. There was no statistically significant difference for the two-dimensional accuracy of impression technique, but two-step technique showed better trend than one-step technique.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제34권3호
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• pp.376-382
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• 2008

Anterior open bite is a condition in which maxillary and mandibular incisors do not occlude at central occlusion. It is a vertical discrepancy of the jaws and dental arches that has many etiologic factors making it difficult in diagnosis, treatment and prediction of prognosis. One of the causes of open bite is abnormal size and shape of the tongue. Macroglossia, a condition in which tongue is oversized, is caused by several factors which are not clearly identifiable, and it may be a major factor of anterior and posterior open bite. Macroglossia is subdivided into true, functional and pseudomacroglossia depending on its relative size in the oral cavity. In this case report, a patient was diagnosed as skeletal Class II with pseudomacroglossia, and was treated with SARPE in order to expand the narrowed maxillary arch and Quad helix for the mandibular arch. As a result the transverse deficiency was treated. In the adult patients where no skeletal growth is expected, SARPE has shown to be effective in treating maxillomandibular transverse discrepancies in which macroglossia was accompanied as in this case.

• 대한치과기공학회지
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• 제42권1호
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• pp.17-25
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• 2020

Purpose: The purpose of this study was to evaluate and compare the accuracy of definitive casts that are fabricated from digital intraoral impression and conventional impression technique. Methods: A master model(ANNA-4, Frasaco GmbH, Tettnang, Germany) with the prepared upper full arch tooth was used. Conventional impression and then stone model(n=10) were produced from this master model, and on the other hands, digital impressions were made with the CS-3600 intraoral scanner(n=10). Six linear measurements were recorded between landmarks, directly on each of the stone models on two occasions by a single examiner. Measurements were made with a digital caliper to the nearest 0.01mm from manual models and with the software(Delcam PowerSHAPE) from the virtual models. The t-student test for paired samples and intraclass correlation coefficient(ICC) were used for statistical analysis. Results: The measurement of two methods showed good reliability. The ICC of the two models were 0.88~0.91(stone model) and 0.94~0.99(digital model). The mean differences to master model for stone model and digital model were 0.10~0.14mm, and 0.14~0.20mm, respectively. Conclusion: The definitive casts obtained with digital intraoral technique model had significantly larger dimensions as compared to those of the stone model. However, the differences to the master model detected appear to provide enough accuracy and reliability for clinical application.

• 대한치과교정학회지
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• 제27권3호
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• pp.445-456
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• 1997

본 연구는 안면비대칭이 존재하는 사람에 있어서 상악치열궁의 좌우측 치아에서 전후방, 측방 그리고 수직 비대칭의 존재 유무와 상악 중절치의 치축경사 변화 정도및 이러한 비대칭 양상과 하악골의 편위 정도와의 상관성을 알아보고 정상군과의 비교를 통하여 상대적인 비대칭의 양상을 파악하고자 고안되어졌다. 부산대학교병원 교정과에 내원한 환자들 중 하악골의 편위를 동반한 골격성 비대칭을 가진 21명을 안면비대칭군으로 선정하고 임상적으로 양호한 안모를 가지고 골격성의 비대칭이 없는 20명을 정상군으로 선정한 후 상악치열궁모형과 정모두부방사선규격사진을 이용하여 상악치열궁을 이루는 좌우측 치아의 위치와 상악 중절치 치축경사, 그리고 상악 제1대구치의 수직위치를 계측하고 분석하여 다음과 같은 결과를 얻었다. 1. 안면비대칭군에서 치성 비대칭의 정도와 하악의 편위정도 사이에는 높은 상관성을 나타내지 않았다. 2. 안면비대칭군에서 악골이 편위된 측의 치아들이 더 측방으로 확장되어 있었다. 그리고 상악 제1대구치와 제2대구치의 전후방위치와 상악 중절치의 치축경사에서 차이가 있었다. 3. 안면비대칭군에서 측방 비대칭은 후방치아로 갈수록 증가되었으며 전후방 비대칭에 비해 더 크게 나타났다.

• 대한치과보철학회지
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• 제51권1호
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• pp.33-38
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• 2013

교합평면은 시상면적인 치열궁 형태를 나타내는 것으로, 악구강계를 구성하는 요소의 하나인 교합을 형태적으로 구성한다. 본 증례에서는 생체의 정중 시상면에 대한 수평, 측방좌표를 교합기상에 재현하여 상하악 치아 및 결손부 치조제에 대한 좌우 동적인 위치관계 얻기 위해 Shilla system (Hamans, Tokyo, Japan)을 이용하여 교합평면을 재구성 하였다. 본 증례의 환자는 41세의 남자 환자로 상악 전치부 10본금속-도재 고정성국소의치 파절 및 탈락과 전반적인 치료를 주소로 내원하였다. 임상 검사, 방사선 검사, 모형분석을 통해 임플란트 식립을 동반한 완전구강회복술을 하기로 결정하였다. Gothic Arch device (Centrofix; AmannGirrbach GmbH, Germany)를 이용하여 악간관계를 채득하고 마운팅 후, Shilla system을 이용하여 기존 교합평면을 평가, 분석하여 진단 납형을 제작하였다. 이를 토대로 방사선 스텐트를 제작하여 임플란트 식립하였고, 진단 납형을 이용하여 임시수복물을 제작하였다. 임시 수복물의 형태 및 교합 양식을 재현하기 위해 맞춤 전방유도판을 제작하고, 교차 마운팅을 시행하였으며 최종 수복물은 지르코니아 코핑을 이용한 완전 도재관으로 제작하였다. 이상과 같이 전악수복환자에서 진단과 치료 과정에서 Shilla system을 이용하여 적절한 심미적, 기능적 수복 결과를 얻을 수 있었다.

• 대한소아치과학회지
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• 제40권3호
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• pp.149-158
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• 2013

이 연구의 목적은 치과용 3차원 Come-beam CT 영상을 이용하여 정중과잉치의 형태와 매복 양상 및 연관된 합병증에 대해 평가하는 것이다. 2007년부터 2012년까지 정중과잉치를 주소로 조선대학교 치과병원 소아치과에 내원한 280명의 환아의 cone-beam CT 영상을 평가하였다. 매복된 정중과잉치는 여아보다 남아에서 더 빈번했고, 약 3.3 : 1의 비율을 보였으며 6~8세에서 가장 많이 관찰되었다. 환자당 정중과잉치의 개수는 1.38개였다. 대부분의 정중과잉치는 원추형(79.5%)이었으며, 역위방향(48.6%)으로 위치하고 있었다. 근원심적 위치로는 정중부(81.8%)가 가장 흔했고, 수직적으로는 치경부 근처(60.3%)에 가장 많이 분포하였으며, 순구개측 위치로는 구개측(73.8%)에 가장 많이 위치였다. 정중과잉치의 47.5%에서 합병증이 관찰되었고 인접치 변위와 맹출 지연이 가장 흔했다. 과잉치의 형태와 수직적 위치, 그리고 순구개측 위치가 합병증과 상관관계를 보였다. Cone-beam CT는 매복된 정중과잉치에 대한 3차원적 위치 정보와 정확한 영상을 제공하였다.

• 대한치과교정학회지
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• 제46권1호
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• pp.3-12
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• 2016

Objective: The purpose of this study was to compare the precision of three-dimensional (3D) images acquired using iTero$^{(R)}$(Align Technology Inc., San Jose, CA, USA) and Trios$^{(R)}$(3Shape Dental Systems, Copenhagen, Denmark) digital intraoral scanners, and to evaluate the effects of the severity of tooth irregularities and scanning sequence on precision. Methods: Dental arch models were fabricated with differing degrees of tooth irregularity and divided into 2 groups based on scanning sequence. To assess their precision, images were superimposed and an optimized superimposition algorithm was employed to measure any 3D deviation. The t-test, paired t-test, and one-way ANOVA were performed (p < 0.05) for statistical analysis. Results: The iTero$^{(R)}$ and Trios$^{(R)}$ systems showed no statistically significant difference in precision among models with differing degrees of tooth irregularity. However, there were statistically significant differences in the precision of the 2 scanners when the starting points of scanning were different. The iTero$^{(R)}$ scanner (mean deviation, $29.84{\pm}12.08{\mu}m$) proved to be less precise than the Trios$^{(R)}$ scanner ($22.17{\pm}4.47{\mu}m$). Conclusions: The precision of 3D images differed according to the degree of tooth irregularity, scanning sequence, and scanner type. However, from a clinical standpoint, both scanners were highly accurate regardless of the degree of tooth irregularity.

• 한국산학기술학회논문지
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• 제15권8호
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• pp.5109-5115
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• 2014

본 논문은 치열궁 변화에 따른 잇솔규격 변화의 필요성을 연구하고자 일부 대학생을 대상으로 사용하고 있는 잇솔을 수집하여 잇솔의 각 부위별 규격을 측정하고, 치열궁을 측정하여 성인의 구강환경에 적합한 잇솔규격기준을 마련하는 기초자료를 제안하고자 하였다. 그 결과 잇솔 종방향은 25 mm이내, 잇솔 횡방향은 11 mm이내의 잇솔 개발이 요구되었다. 잇솔이 모든 치면에 적용되어 치면세균막 관리에 적합한 잇솔 선정을 위해서는 잇솔규격 변화와 함께 올바른 잇솔을 선정할 수 있는 전문가의 교육도 필요하다.