• The korean journal of orthodontics
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• v.28 no.4 s.69
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• pp.533-546
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• 1998

A Skeletal Class III malocclusion may be the result of a large mandible, a small maxilla or combination of the two. Protraction devices for the maxilla are used to promote the growth of a deficient maxilla by applying extraoral force to actively growing patients. This study has been performed to determine whether there are significant differences in skeletal and dental changes between FH/Pal 1 and FH/Pal 2 group, SNA 1 and SNA 2 group, SNB 1 and SNB 2 group, and LFH 1 and LFH 2 group after RME and facial mask therapy. The results of this study can be summarized and concluded as follows ; 1. In all patients after maxillary protraction, the maxilla and maxillary dentitions moved forward, and the mandible rotated backward and downward. In most of them, palatal plane is tends to have an upward inclination. 2. The FH/Pal group 1, having an upward inclination of the palatal plane as a result of Facial mast showed statistically significant maxillary forward movement compared to the FH/Pal group 2. 3. The SNA group 1 showed significantly less mandibular backward movement and there was a tendency for the palatal plane to upward inclination compared to SNA group 2. 4. The SNB group 1 showed significantly less maxillary forward movement, but the vertical dimension, especially the lower facial height increased by mandibular downward rotation compared to SNB group 2. 5. LFH group 1, which had large saddle angle and posterior positioned mandible in the pre-treatment stage, showed maxillary protraction effect without significant increase in lower facial height compared to LFH group 2.

• The korean journal of orthodontics
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• v.17 no.2
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• pp.255-277
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• 1987

부정교합(不正交合)의 발생요인(發生要因)의 하나로서 비인두강(鼻咽頭腔)의 협착(狹窄)이 거론(擧論)되어 왔다 본(本) 연구(硏究)는 안면골격(顔面骨格)의 형태결정(形態決定)에 비인두강(鼻咽頭腔)의 기여정도(寄與程度)를 파악(把握)하고자 함에 있다 연구자료(硏究資料) 및 방법안(方法安) 한국인(韓國人) 성인(成人) 남녀(男女) 156 명(名)의 측모두부X선규격사진(側貌頭部X線規格寫眞)을 사용(使用)하여 NEC PC-9801 VM2 Personal Computer와 Oscon GT-4000 Digitizer에 의한 data 입력(入力)을 행(行)한 후 통계처리(統計處理)를 행(行)하였다 통계처리(統計處理)로서는 각계측치(各計測値)에 대하여 남녀별(男女別)로 평균치(平均値), 표준편차치(標準偏差値)를 산출(算出), Student's t-test를 행(行)하고, 비인두강(鼻咽頭腔) 계측항목(計測項目)과 안면골격(顔面骨格)의 각(各) 계측치간(計測値間)의 상관관계(相關關係)의 검토(檢討)를 행(行)하였다 결(結) 과(果) 1 남녀(男女)의 성차(性差)로서, 여자(女子)보다 남자(男子)가 상악골(上顎骨)에 대해 하악골(下顎骨)이 돌출(突出)되어 있었으며, 안면고(顔面高)가 컸다 2 Ba-S-PNS와 S-PNS-Ba간(間)에 부(負)의 상관(相關)이 인정(認定)되어, 이 두 계측치간(計測値間)애 상호작용(相互作用)이 있는 것으로 판단 되었다 3 비인두강(鼻咽頭腔)의 깊이는 하악(下顎)의 전후위치관계(前後位置關係)와 유의(留意)한 상관관계(相關關係)를 보였다 4 비인두강(鼻咽頭腔)의 깊이와 안면(顔面)의 깊이와는 관련성(關聯性)이 없는 것으로 판단 되었다 5 비인두강(鼻咽頭腔)의 깊이와 안면고간(顔面高間)에 유의(有意)한 부(負)의 상관(相關)이 시사(示唆)되었다 6 비인두강(鼻咽頭腔)의 고경(高經)과 안면고간(顔面高間)에 유의(有意)한 상관관계(相關關係)가 인정(認定)되었다.

• The korean journal of orthodontics
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• v.39 no.4
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• pp.257-272
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• 2009

This case report describes the treatment of an adult patient with a Class I canine and molar relationship but a convex profile with a retrognathic mandible and marked lip protrusion, as well as an excessive lower anterior facial height and reduced transverse width on both arches due to a nasal airway obstruction. The constricted arches were expanded by surgically-assisted rapid palatal expansion and the application of a Schwarz appliance to the maxilla and mandible. Acceptable facial balance was obtained using contemporary directional force technology with microimplant anchorage (MIA), which provided horizontal and vertical anchorage in the maxillary and mandibular posterior teeth, as well as intrusion and torque control in the maxillary anterior teeth, resulting in a favorable counterclockwise mandibular response. The total treatment period was 29 months and the results were acceptable for 13 months after debonding.

• The Journal of Korean Academy of Prosthodontics
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• v.56 no.4
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• pp.308-316
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• 2018

Telescopic denture has advantages such as transfer the occlusal force to the long axis of the abutment, easiness of oral hygiene management, increase of retention and stability, splint effect due to secondary fixation between abutments and have been reported a higher success rates than conventional removable partial denture (RPD). However, there are disadvantages such as complex laboratory procedures, long treatment periods and high costs, and high incidence of complications. This clinical report describes two cases, a 4-point supported telescopic denture using telescopic crown and a 2-point supported telescopic denture using conical crown with functionally satisfactory results. Frequent complications of telescopic denture, which are reported in various literature were reviewed. Clinical and laboratory procedures were performed in consideration of complications that reported.

• Journal of Dental Rehabilitation and Applied Science
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• v.33 no.4
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• pp.321-328
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• 2017

Treatment options for edentulous patients are complete denture and implant prosthesis. A two implant-retained overdenture can be considered the first treatment in the edentulous mandible, but there is no clear consensus of treatment for edentulous maxilla. Implant-retention/support overdenture shows better retention and stability than complete denture and is less expensive and more esthetic than implant-supported fixed prosthesis. CM $LOC^{(R)}$ $Pekkton^{(R)}$ attachment is a solitary type attachment and evaluated to have excellent abrasion resistance and retention with a female part made of poly-ether-ketone-ketone. Meanwhile, SR Ivocap system is injection molding method and discussed to show few changes in the vertical dimension of denture and have excellent fracture resistance. In this case, we restored maxillary arch with a four implant-retained overdenture using CM $LOC^{(R)}$ $Pekkton^{(R)}$ and SR Ivocap system, and mandibular arch with a removable partial denture. Through this procedure, satisfactory outcomes were achieved both in functional and esthetic aspects.

• Journal of Technologic Dentistry
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• v.3 no.1
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• pp.9-16
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• 1981

A comparative study was conducted to evaluate the relationship of investing medium to the amount of vertical occlusal changes and to the differences of surface smoothness during denture construction. Three groups of 20 dentures, 30 sets of upper and lower were fabricated of conventional heatcuring acrylic denture base resin, using silicone-gypsum molding techniques, with or without covering the occlusal surfaces of the teeth by artificial stone and all-gypsum molding techniques. The distance between the two reference points indented by 1/2 round bur on the upper and lower frontal surfaces of each articulator were measured and recorded before processing and again after processing and remounting of each denture on the articulator. The differences between the two recordings indicated the amount of vertical opening during denture processing. The difference of surface smoothness were investigated and determined by 3 observers continual comparing of the two randomly selected dentures with each other, which were seperately selected as pairs from the different two groups of 20. The results obtained were as follows: 1. During resin processing no statistically significant differences of the amount of vertical occlusal changes were detected between any of the two groups of two silicone-gypsum and one allgypsum molding techniques, although the amount of vertical opening was somewhat increased when silicone-gypsum molding technique was used. 2. Surface smoothness of the processed denture was makedly by increased when silicone-gypsum molding technique was used.

• The korean journal of orthodontics
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• v.16 no.1
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• pp.7-34
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• 1986

본 연구목적은 여자성인교정을 위한 치료목표를 수립하기 위한 기준을 설정하는데 있다. 이용된 연구자료는 96명의 한국인 TV탈랜트와 영화배우 또는 패션모델중 교합과 안모를 평가하여 선정된 30명의 측모두부X선규격사진이었으며 선정된 표본의 평균연령은 20.16세였다. 연구방법은 측모경조직분석을 위해 Downs분석, Northwestern분석, Steiner분석, Wylie분석, Tweed분석, Dimensional linear분석법이 이용되었고 측모연조직분석을 위해 Holdaway연조직분석법이 적용되었다. 조사된 계측치들은 Apple II 48K system을 이용하여 각항목에 대한 평균치와 표준편차를 산출하였으며 백인, 한국인, 일본인의 기존계측치와 비교하였다. 그 연구결과는 다음과 같다. I. 경조직분석 (1) 본 연구와 백인과의 비교 본 연구에서는 백인에 비해 하악이 후퇴되었고 상${\cdot}$하악절치는 순측경사를 보였다. 또한 하악하연경사가 심했다. (2) 본 연구와 한국인정상성인여자(이 연구)의 계측치 비교 이의 연구계측치에 비해서 상악이 후퇴되어있고 상${\cdot}$하악절치는 설측경사를 보였다. 따라서 본 연구의 안모형태는 이의 한국인정상성인여자에 비해서 직선형안모를 보였다. (3) 본 연구와 일본정상인의 계측치 비교 일본정상인에 비해 하악이 돌출되었고 상${\cdot}$하절치는 설측경사를 보였다. 또한 안모의 상부고경과 하악크기는 일본정상인에 비해 크게 나타났다. II. 연조직분석 연조직분석의 11항목중 H-선에 대한 연조직 subnasal과 하순의 계측치가 Holdaway의 acceptable range를 벗어났다. 그 이유는 본연구에서 하악이 상대적으로 후퇴양상을 보였기 때문이라고 사료된다. 이외항목의 계측치들이 acceptable range내에 있다는 것은 연조직이 경조직의 이동에 따라 움직이고 있음을 의미한다. III. Downs분석, Northwestern분석, Steiner분석, Wylie분석, Tweed분석, Dimensional linear measurements분석을 위한 평균치, 표준편차, Polygon도표를 작성함으로써 한국성인여자교정의 진단과 치료목표를 정하는데 지침이 된다고 사료된다.

• The korean journal of orthodontics
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• v.23 no.4 s.43
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• pp.645-660
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• 1993

In this study, effects of incision of retrodiscal tissue and unilateral occlusal reduction on temporomandibular joint of rabbit were investigated. Twenty-seven adult New Zealand White Rabbits, weighing over 3.5kg, were utilized in this study. Temporomandibular joint surgery was performed in left temporomandibular joint of 24 rabbits to displace disc anteriorly through incising the retrodiscal tissue 1-2mm posterior to the disc. They were divided into two groups : twelve were left untreated after surgery, occlusal reduction was performed on left posterior teeth every 2 weeks in the other twelve rabbits, The remaining three served as the control group. The sample were sacrificed by 8, 12, and 16 weeks after surgery. Histologic examinations were performed after sacrificing them. The results were as follows : 1. Histologic findings which were manifested by flat articular fossa, broad articular surface, generalized recession of articular cartilage and sclerosis of subchondral bone were observed. These findings were similar to internal derangement. 2. In the rabbits untreated after surgery, thin cartilagenous layer and necrotic tissue were observed in 8 weeks group, calcifying cartilagenous layer was observed in 12 weeks group, and cartilagenous layer on anterior portion was observed in 16 weeks group. So, it showed gradual healing pattern into the normal tissue except displaced disc. 3. Occlusal trauma after surgery resulted in generalized recession of upper and lower articular surface. Necrosis and vertical split on condylar process of mandible were observed in 8 weeks group. Osteoclasts, exposure of subchondral bone due to erosion on upper and lower articular surface, and degenerative changes on retrodiscal tissue were observed in 16 weeks group. So, it showed continuous prowess pattern of osteoarthrosis.

• The Journal of Korean Academy of Prosthodontics
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• v.28 no.2
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• pp.77-90
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• 1990

The purpose of this study was to compare the amount of the vertical pin opening of $33^{\circ}$ resin and $0^{\circ}$ resin teeth during processing and to determine whether the changes in tooth contacts by using articulation ribbon and T-Scan system follow any identifiable pattern, and to determine if there is any correlation between the changes in tooth contacts and the amount of the vertical pin opening after processing. Through statistical analyses on the data from this study, the following conclusions were obtained. 1. The amounts of the vertical pin opening were 0.78m, 0.87mm for $0^{\circ}$ teeth and $33^{\circ}$ teeth, respectively. But there was no significant difference between them. 2. The total number of contact points recorded by articulating ribbon after processing was decreased to 442.5% of that before processing. 3. The mean values for the number of contact points per tooth recorded by articulating ribbon after processing were 4.3 for the second molar, 3.8 for the first molar, 1.3 for the second premolar, 0.8 for the first premolar. The reduction of contact points per tooth became greater moving in an anterior direction. 4. The correlation between the reduction of contact points and the amount of the pin opening after processing was not significant. 5. The mean values for the numbers of contact points per tooth recorded by T-Scan system after processing were 2.2, 2.5, 1.0, and 0.5 at the second molar, the first molar, the second premolar, and the first premolar, respectively. 6. The correlation between the number of contact points by using articulating ribbon and TScan system after processing was not significant.

• The Journal of Korean Academy of Prosthodontics
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• v.53 no.2
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• pp.157-166
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• 2015

This article describes how to use CBCT and an intraoral scanner in a fully edentulous case that enables the clinician to place implants with flapless guided surgery and to engage prefabricated, customized implant abutments at the time of implant surgery, with only 1 clinical consultation before implant surgery. The patient's existing denture is used to simulate the teeth, the soft tissue and the vertical dimension of occlusion, and jaw relationship in the fully edentulous jaw. It provides clinicians with a fast workflow and improves clinical efficiency.