• Title/Summary/Keyword: 골 깊이

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Effect of rhPMP-2 coated implants on alveolar ridge augmentation in dogs (성견에서 골형성단백질이 코팅된 임플란트가 치조골 증대에 미치는 영향)

  • Park, Chan-Kyung;Kim, Jong-Eun;Shin, Ju-Hee;Ryu, Jae-Jun;Huh, Jung-Bo;Shin, Sang-Wan
    • The Journal of Korean Academy of Prosthodontics
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    • v.48 no.3
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    • pp.202-208
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    • 2010
  • Purpose: This study was aimed to evaluate the effect of rhPMP-2 coated implants on alveolar ridge augmentation in dogs. Materials and methods: Six Beagle dogs were used in this study. Six 8.0 mm long anodized surface titanium implants were placed 5 mm into the mandibular alveolar ridge following 6 month of healing period after extraction. Each animal received three implants coated with rhBMP-2 and three uncoated control implants using the randomized split-mouth design. Radiographic examinations were undertaken immediately at implant placement (baseline), at weeks 4 and 8 after implant placement. The amount of bone augmentation was evaluated by measuring the distance from the uppermost point of the coverscrew to the marginal bone. Implant Stability Quotient (ISQ) values were measured immediately at implant placement and 8 weeks after implant placement. For the statistical analysis, Man-Whitney ranksum test and Wilcoxon signed rank test of SPSS 12.0 software were used (P=.05). Results: The BMP group exhibited radiographic vertical bone augmentation about $0.6{\pm}0.7$ mm at 8 weeks later while controls showed bone loss about $0.4{\pm}0.6$ mm. There was significant difference among the rhBMP-2 group and controls in bone level change (P<.05). The ISQ values were significantly higher in the BMP-2 group than the control group at 8 weeks later (P<.05), while there was no significant difference at surgery. Conclusion: Within the limitation of this study, the rhBMP-2 coated on anodized implant could stimulate vertical alveolar bone augmentation, which may increase implant stability significantly on completely healed alveolar ridge.

Visualization of the Origin of the Vertebral Arteries with Color Doppler Sonography (색도플러 초음파검사에 의한 경추골동맥 기시부 관찰)

  • Yoon, Seok-Hwan;Lee, Won-Hong;Lee, Dae-Hyung
    • Journal of radiological science and technology
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    • v.32 no.1
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    • pp.87-93
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    • 2009
  • Background/aim : Atherosclerotic disease at the origin of the vertebral arteries is one of the risk factors for vertebrobasilar ischemic disease. Assessment and visualization of the origin of the vertebral arteries with color doppler sonography is a non-trivial task. The aim of this study is to increase the visualization rate of the origin of the vertebral arteries with color doppler sonography. Materials and Methods : Color doppler sonography for the vertebral arteries included carotid arteries was performed to 198 patients. We first examined the vertebral artery in the upper neck in the direction of the subclavian artery to distinguish its origin more easily. If the vertebral artery origin was not visualized in natural position, the examiner pushed the transducer toward a clavicle or pushed the shoulder of patient by the other hand. The technical methods for visualization of the vertebral artery origin were classified into three grades: natural position, pushing the transducer, and pushing the shoulder of patient according to the depth (3.0 cm and shallower, deeper than 3.0 cm) of the origin. Results : The origin of the vertebral arteries could be visualized in 97% on the right and in 92% on the left. The origin of the vertebral arteries could be visualized in 98.6%, 1.4%, and 0.0% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at shallower than 3.0 cm on the right side. The origin of the vertebral arteries could be visualized in 81.2%, 14.6%, and 4.2% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at deeper than 3.0 cm on the right side. The origin of the vertebral arteries could be visualized in 85.4%, 10.7%, and 3.9% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at shallower than 3.0 cm on the left side. The origin of the vertebral arteries could be visualized in 55.7%, 30.4%, and 13.9% in natural position, pushing the transducer, and pushing the shoulder of patient, respectively, at deeper than 3.0 cm on the left side. Conclusion : If the examiner pushes the transducer toward a clavicle or pushes the shoulder of patient by the other hand, when the vertebral artery origin during the color doppler sonography is not visualized in natural position, visualization rate of the origin of the both vertebral arteries is increased.

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A STATISTICAL STUDY ON THE CORRELATION BETWEEN THE NASOPHARYNGEAL SPACE AND THE DENTOFACIAL STRUCTURES (비인두강(鼻咽頭腔)과 안면골격간(顔面骨格間)의 상관관계(相關關係)에 대(對)한 통계학적(統計學的) 연구(硏究))

  • Oh, Sungjin;Kinoshita, Z
    • 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.

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Experimental Study on the Characteristics of the Heat Transfer and the Pressure Drop inside the Small Diameter Tube with the Heat Transfer Enhancing Geometry (소구경 전열관 내의 열전달촉진 형상변화에 따른 열전달 및 압력강하 특성에 관한 실험적 연구)

  • Park Chan-Woo;Chin Sung-Min;Jurng Jong-Soo
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.4
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    • pp.297-303
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    • 2006
  • Friction and heat transfer coefficients were measured inside the corrugated tube using water as the working fluid. The test is performed for 16 tubes which outer diameter of tubes are 12.7 mm. These specifications are 4 indentation depths and 4 indentation pitches, respectively. The range of the water velocity inside the tube is from 0.5 to 3.0 m/s (8,500

A cephalometric study on the velopharyngeal changes after maxillary protraction (상악골 전방견인치료후 구개범인두 변화에 대한 단기간의 측모두부방사선 계측학적 연구)

  • Lee, Nam-Ki;Cha, Bong-Kuen
    • The korean journal of orthodontics
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    • v.36 no.2 s.115
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    • pp.161-169
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    • 2006
  • The purpose of this study was to investigate cephalometrically the short term static velopharyngeal changes in 25 patients (10 boys and 15 girls, aged from 5 years 9 months to 12 years 10 months in the beginning of treatment) with skeletal Class III malocclusions who underwent nonsurgical maxillary protraction therapy with a facemask. The linear, angular and ratio measurements were made on lateral cephalograms. Only the change in hard palatal plane angle was negatively correlated with the change in maxillary depth or N-perp to A (p<0.01). The change in velar angle showed a statistically significant increase (p<0.001). This change was influenced more by the soft palatal plane angle than by the hard palatal plane angle (p<0.001). The changes in soft tissue nasopharyngeal depth and hard tissue nasopharyngeal depth showed statistically significant increases (p<0.001). Correlations between the changes in soft tissue (or hard tissue) nasopharyngeal depth and the change in soft palatal plane angle were significant (p<0.05). The increase in hard palate length was statistically significant (p<0.001). The change in hard palate length was negatively correlated with the change in soft tissue nasopharyngeal depth (p<0.05). The change in need ratio S (C) showed a statistically significant increase (p<0.001). But this difference was within the normal range reported by previous studies. These findings indicate that the velopharyngeal competence was maintained even if the anatomical condition of the static velopharyngeal area were changed after maxillary protraction.

Use Impacts of Trail and Campsite on Natural Environments in Mt. Palgong Natural Park (팔공산자연공원에서의 등산로 및 야영장 이용이 자연환경에 미치는 영향)

  • 권태호
    • Journal of the Korean Institute of Landscape Architecture
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    • v.17 no.3
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    • pp.21-34
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    • 1990
  • Trail and campground deteriorations and their environmental changes of soil and vegetation were studied in Tonghwa -Sa district of Mt. Palgong Natural Park through 1988 into 1989. The results are summarized as follows : 1. The bare width of trail as one of the trail condition factor was significantly greater on the more heavily used trail. Deterioration types of trail which had higher frequency for a total of 45 observations were rock exposure(42%), trail deepening(40%) and root exposure(18%) in the high order. And also sound type on which the trail was not deteriorated at all amounted to 33% of all observations. 2. Ecological changes of soil and vegatation of trailsides were not found at a uniform tendency except that soil hardness was slightly decreased from trail edge to the forest, but they could be grouped by the type of user\`s behavior and site conditions. Use impacts on the natural environment of trailside in Mt. Palgong are still far from the severe harmulness. 3. Worse damages to compground condition were appeared in Bawi-gol than Susu-gol campsite. Types of mechanically damaged trees were tree with exposed root(63% ), scared tree(43% ), mutilated tree(30 % ) and felled tree in highly frequent order. And diameter increments of trees in campsites were oppressed by the campers. 4. Tree damage types and their frequencies could be basic as a means of which grasp the bounds of user's impacts. User's disturbance on campsite extended to the distance of 70∼90m from the core of campsite at Pawi-gol and 20∼30m at Susu-gol respectively. As the tolerant trees to use impact, Lespedeza maximowiczii, Rhus trichocarpa, Acer palmatum, Rubus crataegifolius and Celastrus orbiculatus were considered.

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The Effect of Splinting with Concomitant Root Planing;Clinical and Digital Subtraction Radiographic Study (치근활택술과 스프린트 병행처치의 효과에 관한 연구;디지털 공제 촬영술을 이용한 임상적 연구)

  • Lee, Ji-Young;Kye, Seung-Bum;Kim, Won-Kyoung;Lee, Yong-Moo;Ku, Young;Ryu, In-Chul;Chung, Chong-Pyoung;Choi, Sang-Mook;Han, Soo-Boo
    • Journal of Periodontal and Implant Science
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    • v.31 no.1
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    • pp.207-227
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    • 2001
  • 스프린트는 치주처지료에서 부가적 처치법으로 널리 사용되고 있으며, 한편, 디지털 공제 활영술은 기존방사선촬영술의 한계점을 극복하기 위해 기발된 새로운 방법이다. 이번 연구에서는 치근활택술 단독시행시와 스피린트 병행 처치시의 효과를 임상적, 방사선학적으로 비교하였다. 중정도의 성인성 치주염을 가진 20명의 환자를 대상으로 하되 10명은 치근활택술 단독으로, 나머지 10명은 스프린트 병행처치로 처치하였다. 임상적, 방사선학적인 평가는 처치전, 처치후 6개월에 행하고, 임상적 평가의 경우 3개월에 추가로 실시하였다. 이번 연구에서 사용된 임상 지수로는 치태지수, 치은지수, 치은퇴축, 치주낭깊이, 임상부착수준, 임상부착증가, 탐침시출혈, 치아동요도 등이며, 방사선학적 평가는 기존 방사선촬영술에 의한 방법과 디지털 공제촬영수렝 의한 방법으로 행하였다. 디지털 공제 촬영술에 의한 평가시, 영상은 Digora 프로그램에 의해 획득하고 Emago 프로그램으로 처리 하여 다음과 같은 결론을 얻었다. 1. 처치후 3개월에 치태지수, 치은지수, 치은퇴축, 치주낭깊이, 임상적부착수준, 탐침시 출혈 등의 임상지수들이 변했으며, 특히 이러한 변화는 치주낭깊이, 치은퇴축, 탐침시출혈에서 유의성이 있었다. ( p<0.05 ) 그러나 두군간 차이는 인정되지 않았다. ( p>0.05 ) 2. 처치후 6개월에도 치태지수, 치은지수, 치은퇴축, 치주낭깊이, 임상적부착수준, 탐침시출혈, 치아동요도 등의 임상지수들이 변했으며, 특히 이러한 변화는 치주낭깊이, 치은퇴축, 탐침시출혈, 치태지수, 치아동요도에서 유의성이 있었다. ( p<0.05 ) 그러나 두 군간 차이는 인정되지 않았다. ( p>0.05 ) 3. 켄달 상관분석시, 임상적 평가와 기존 방사선 촬영술에 의한 평가사이의 관련성을 낮았으며 거의 0에 가까운 수치를 보였으며 (r=0.110, p=0.639 ) 임상적 평가와 디지털 공제 방사선 촬영술에 의한 평가사이에서 약간 높은 관련성을 보였다. ( r=0.257, p=0.315 ) 즉 치주치료후의 골변화는 디지털 공제 방사선 촬영술에 의한 평가시 기존 방사선 사진보다 임상적 부착증가와 더욱 긴밀한 관련성을 보여준다. 이상의 결과로 볼 때, 스프린팅 처치는 치주 치료에 있어 치근활택술에 부가적 표과를 제공하지 못한다.

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SDF Inverter Design for Induction Heating (유도가열용 SDF 인버터 설계)

  • Shin, W.S.;Gho, J.S.;Park, H.C.;Ham, S.Y.;Park, C.H.
    • Proceedings of the KIPE Conference
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    • 2011.07a
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    • pp.459-460
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    • 2011
  • 본 논문에서는 산과 골이 있는 복잡한 형상의 기어를 일정한 깊이로 열처리하기 위한 효율적인 유도가열에 관한 연구이다. 이를 위해 동시에 이중주파수를 발생하면서 출력을 각각 제어할 수 있는 인버터를 설계하였으며 두개의 인버터로 구동되는 방식을 기준으로 해석, 설계 및 부하와 매칭을 위한 필터 설계를 수행하여, MF(Medium frequency)와 HF(High frequency에서 공진주파수 운전을 위한 최적의 인버터를 설계 및 제작하고자 한다.

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Design of Simultaneous Dual Frequency Output by Dual Inverter (듀얼 인버터에 의한 동시 이중주파수 구동 설계)

  • Shin, W.S.;Gho, J.S.;Park, H.C.;Ham, S.Y.;Park, C.H.
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.498-499
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    • 2010
  • 본 논문은 산과 골이 있는 복잡한 형상의 기어를 일정한 깊이로 열처리하기 위해 인버터에 의해 동시에 이중 주파수(SDF)를 발생하는 기법에 관한 연구이다. 본 연구에서는 2개의 인버터(Dual Inverter)에 의한 방식을 적용하였으며 각각 출력과 주파수가 다른 두개의 주파수를 발생시켜 합성시키는 방식으로 시뮬레이션과 실험을 통해 공진 주파수에서 주파수가 합성되는 것을 확인하였다.

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Rapid canine retraction in a Class II bialveolar protrusion case using a lingually extended distraction screw (제II급 치조 전돌 환자에서 설측 견인 장치를 이용한 급속 견치 견인술)

  • Ahn, Kwang-Seok;Joo, Euk;Park, Ju-Young;Ryu, Young-Kyu;Cha, In-Ho;Lee, Kee-Joon
    • The korean journal of orthodontics
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    • v.36 no.4
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    • pp.308-320
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    • 2006
  • Rapid canine retraction, first introduced by Liou, is a distraction osteogenesis applied to the periodontal ligament tissue. Rapid tooth movement was facilitated by establishing minimal bony resistance on the distal surface of the canine by socket preparation and by osteogenesis on the mesial side in response to the periodontal distraction. Since undesired buccal tipping or extrusion of the canine during retraction tends to occur, it is crucial to maintain the firm path of movement and the axis of the canine during retraction. In order to improve the predictability of the canine movement, lingually extended distraction screws with heavy labial guiding wires were designed. Prefabricated plastic canine models for the estimation of socket depth and miniscrew implants for anchorage reinforcement were also devised. Applying these devices to a female patient with Class II anterior protrusion, the whole treatment was effectively finished in 13 months. Loss of vitality or periodontal problems did not occur throughout treatment, and stable occlusion was maintained during 10 months of retention. This case report demonstrates that a predictable rapid canine retraction can be achieved through the use of this modified technique.