• 대한치과의사협회지
• /
• 제10권3호
• /
• pp.155-158
• /
• 1972

As a factor of dentistry, the form of the tooth especially the size plays an important part. And in orthodontics the relation between the tooth size, arch length and the basal arch is regarded important, and it is closely related to the extraction and retension probolem in treatment planning. The auther's study of the mesio-distal crown diameters of permanent teeth, width and length of the dental arch and basal arch from the cast of 50 men and 53 women who could be measured clerly, among 102 men and 107 women regarded as the normal occlusion showed the followings. 1. Table 1 and table 2 showed the measurement of the mesio-distal maximum width of the permanent teeth, width and length of the dental arch and basal arch of the upper and lower dentitions. 2. Men's mesio-distal width of the teeth, arch length and arch width of the upper and the lower dentition, basal arch width and basal arch length are larger than those of wonen's 3. We compared the Koreans with the American white. Upper central incisors, upper first molars and lower second premolars of the latter were larger than those of the former. And the Koreans's rest tooth of the rest were comparatively larger.

• 대한치과교정학회지
• /
• 제14권1호
• /
• pp.127-134
• /
• 1984

The purpose of the present study was to investigate the correlations of malocclusion between the mother and the offspring and thus heritable features from mother to her offspring. Dental impression was taken of the both jaws of 73 mothers and their sons and 109 mothers and their daughters, and the measurement was obtained from the models. The correlation coefficient of the mesio-distal diameters of teeth and that of occlusion and arch variable was calculated from the mesurement. After the data was analyzed and estimated, the following results were obtained : 1. It was evident that the tooth size of the offspring was influenced from their mother. 2. It was evident that the occlusion, the arch size and shape of the offspring were influenced from their mother. 3. There was not the marked difference between the heredity of occlusion variable and arch variable on the mother-offspring relationship. 4. The correlation of the lower intercanine width and the lower available space discrepancy between the mother and the offspring were greatly influenced with the environmental factor.

• 대한치과교정학회지
• /
• 제5권1호
• /
• pp.51-56
• /
• 1975

In orthodontic field, the study on gnathostatic model is very important to the diagnosis and analysis of malocclusion. The purpose of this study is to observe that relation of orbital plane and upper canine in Koreans. We selected 230 cases with normal occlusion, 124 male and 106 female cases aged from 12 years to 25 years, to prepare 230 gnathostatic models, and measured the distance from midpoint of mesio-distal distance of upper canine to orbital plane in gnathostatic model. The results obtained were as follows: 1) The mean value of the distance from upper canine to orbital plane showed no significant change with age. 2) The mean value of the distance from the upper canine to orbital plane was -3.11mm in male and -3.84mm in female. 3) The orbital plane passed through the upper canine in normal occlusion of Koreans.

• 대한치과교정학회지
• /
• 제52권1호
• /
• pp.53-65
• /
• 2022

Objective: Planning of incisal position is crucial for optimal orthodontic treatment outcomes due to its consequences on facial esthetics and occlusion. A systematic summary of the proposed parameters is presented. Methods: Studies on Google Scholar^©, PubMed^©, and Cochrane Library, providing quantitative information on optimal central incisor position were included. Results: Upper incisors supero-inferior position (4-5 mm to upper lip, 67-73 mm to axial plane through pupils), antero-posterior position (3-4 mm to Nasion-A, 3-6 mm to A-Pogonion, 9-12 mm to true vertical line, 5 mm to A-projection, 9-10 mm to coronal plane through pupils), bucco-lingual angulation (4-7° to occlusal plane perpendicular on models, 20-22° to Nasion-A, 57-58° to upper occlusal plane, 16-20° to coronal plane through pupils, 108-110° to anterior-posterior nasal spine), mesio-distal angulation (5° to occlusal plane perpendicular on models). Lower incisors supero-inferior position (41-48 mm to soft-tissue mandibular plane), antero-posterior position (3-4 mm to Nasion-B, 1-3 mm to A-Pogonion, 12-15 mm to true vertical line, 6-8 mm to coronal plane through pupils), bucco-lingual angulation (1-4° to occlusal plane perpendicular on models, 87-94° to mandibular plane, 68° to Frankfurt plane, 22-25° to Nasion-B, 105° to occlusal plane, 64° to lower occlusal plane, 21° to A-Pogonion), mesio-distal angulation (2° to occlusal plane perpendicular on models). Conclusions: Although these findings can provide clinical guideline, they derive from heterogeneous studies in terms of subject characteristics and reference methods. Therefore, the optimal incisal position remains debatable.

• 치위생과학회지
• /
• 제20권2호
• /
• pp.118-124
• /
• 2020

The purpose of this comparison of case reports is to introduce the results of the application of new devices for the management of growing Class III malocclusions in children. Two 8-year-old boys had a chief complaint of anterior crossbite. Anterior crossbite correction using a tandem traction bow appliance (TTBA) or a Carriere Motion 3D Class III appliance with a Transforce appliance was planned. By comparing cephalometric radiographs before and after treatment, changes in skeletal growth and incisor inclination to the Frankfort horizontal (FH) plane could be measured. Both devices increased SNA and ANB angles, N-I Pg-A, U1 to SN, and U1 to FH. Both appliances improved facial features and resolution of anterior crossbite. The TTBA and Carriere Motion 3D Class III appliance had similar effects when applied as early treatment for growing mesio-occlusions and anterior crossbite in two boys. However, long-term outcome assessments and well-designed comparative studies are still required.

• 대한치과의사협회지
• /
• 제12권9호
• /
• pp.691-694
• /
• 1974

The trends of restoration on abrased teethis mostly based on gnathology or on practical experience. This study was performed on plaster models from 60 young men whose teeth and occlusion are clinically normal. A pair, upper and lower models, were mounted on HANAU articulator. Iron ball bearing 0.2mm 0.5mm 0.7mm and 1.0mm in diameter was attached on mesiobuccal cusp of upper first molar. [table I] Long ribbon shape of cold cure resin was inserted and jaw was closed gently so as not to move disturb original position of iron ball. The resin bite registration was measured minimun thickness from each lingual cusps of upper jaw and buccal cusps of lower jaw by means of Bowley gauge. The results were as follows (graph). 1) The distance from upper lingual cusps and lower buccal cusps: backward cusps showed smaller than standard cusp (upper mesio-buccal cusp) and forward cusps showed longer than standard. 2) The measurements from upper lingual cusps are not coincide with lower buccal cusps.

• 대한치과교정학회지
• /
• 제48권5호
• /
• pp.339-345
• /
• 2018

Objective: The purpose of this study was to clarify the effects of continuous force application for extrusive tipping movement and occlusal interference on periapical root resorption in the rat mandibular first molar. Methods: We constructed an appliance comprising a titanium screw implant with a cobalt-chromium post as the anchorage unit and a nickel-titanium closed coil spring (50 cN) as the active unit. Force was applied on the mandibular left first molar of rats for 8 (n = 10) and 15 days (n = 10; experimental groups), with the tooth in occlusion. Five rats were included as a non-treated control group to examine the body effect of the appliance. Active root resorption lacunae, identified using tartrate-resistant acid phosphatase, were evaluated in terms of the length, depth, and area. Results: The rat mandibular first molars were mesially tipped and extruded in the occlusal direction. This mesio-occlusal tipping movement and occlusion resulted in the formation of a compression zone and active root resorption lacunae in the distoapical third of the distal roots. However, there was no significant difference in the amount of root resorption between the two experimental groups. The control group did not exhibit any active root resorption lacunae. Conclusions: Periapical root resorption was induced by continuous extrusive tipping force and occlusal interference in rat mandibular molars. These data suggest that we orthodontists had better take care not to induce occlusal interference during our orthodontic treatment.

• 구강회복응용과학지
• /
• 제33권2호
• /
• pp.127-134
• /
• 2017

전신적 혹은 국소적 원인에 의해 발생하는 치아맹출지연은 대부분 소아기에 발견되어 교정적 정출을 이용한 치료를 진행한다. 하지만 소아기때 치료를 받지 못하고 성인기로 될 경우, 교정에 의한 치아이동이 어려워지기 때문에 보철수복으로 치료를 변경할 수 있다. 보철계획을 결정하기 전 고려사항으로는 치아상실이 나타난 범위, 치아사이 근원심공간 및 악간공간, 환자의 연령대 등이 있다. 이 논문에서는 상하악 구치부 맹출지연환자를 지르코니아 부분 고정성 보철물을 통해 구강회복한 증례를 소개하고자 한다.

• 대한치과의사협회지
• /
• 제17권2호통권117호
• /
• pp.129-135
• /
• 1979

This 27 year-old male patient had severe mandibular prognathism (right and left mesio-occlusion were 0.4㎝ and 1.2㎝ , respectively). He had good oral health relatively exception of missing teeth. We examined all of his oral and skeletal status with full mouth x-ray taking, study model, and cephalogram. His general condition was good but above examination indicated the surgical operation for the mandibular prognathism. His laboratory tests were within normal limits. We determined surgical operation which was done by extraoral approach bilaterally. Incisions were made bilaterally 1.5㎝ beneath the inferior border of the mandible in the selected area and then the inferior border of the ascending rami was exposed. Retracting the periosteum to the lingual and buccal a slight amount, the cut in the bone was performed by use of bone drill. Avoiding T.M.J. troubles, the proximal segmant was not fixed to anterior segment, being in overlapping state buccally, in order to expect a natural healing by the environmental muscles and ligaments. We had immobilization with intermaxillary fixation by using the multiple Stout's method. He was discharged 17 days after operation. His general condition and operation results were good and satisfactory.

• 구강회복응용과학지
• /
• 제27권1호
• /
• pp.41-50
• /
• 2011

치은 정점이란 임상치관의 변연치은에서 가장 치근측인 지점을 말한다. 본 연구는 젊은 연령대의 한국 성인을 대상으로 상악 전치부에서 치은 정점의 근원심적, 수직적 위치를 수치화하려 하였다. 남성 25명, 여성 25명의 건강한 치주 조직을 갖는 평균나이 28.8세의 환자를 대상으로 하였다. 진단모형 상에서 치은 정점이 치아의 수직이등분선으로부터 근원심적으로 떨어져 있는 양을 측정하였다. 또한 측절치의 치은 정점이 중절치와 견치의 치은 정점을 연결하는 선으로부터 수직적으로 떨어져 있는 양을 측정하였다. 연구 결과 상악 중절치와 측절치의 치은 정점은 임상치관의 수직이등분선으로부터 원심에 위치하며 견치에서는 근원심적으로 같은 위치에 있는 경향이 있었다. 원심 위치의 빈도와 양은 중절치, 측절치, 견치 순으로 전방에 있는 치아일수록 컸다. 상악 측절치의 치은 정점은 중절치와 견치의 치은 정점을 연결하는 선으로부터 평균적으로 $0.73{\pm}0.43$ mm 치관측으로 위치하는 것으로 나타났다.