수종의 가열 종합방법에 따른 위치상용레진의 물리적 성질에 관한 비교연구

정창모 치과연구사 1990 치과연구 Vol.28 No.6

B2B기업의 CSR명성이 영업사원의 소진(burnout)에 미치는 영향

정창모 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.10

Recently, the importance of B2B CSR is being highlighted. Meanwhile, in B2B marketing, salesperson is widely recognized as a key resource influencing supplier firm performance. Therefore, the author paid attention to the role of supplier CSR reputation in customer-salesperson interaction process. So, this study collected dyadic data from 161 B2B purchasing managers and salespersons interacting with them. For customers, a supplier CSR reputation increased customer citizenship behavior and customer long-term orientation. With salespersons, they experienced less burnout due to interacting with customers having higher customer citizenship behavior and long-term orientation. Moreover, the results confirmed that a supplier CSR reputation lowered salespersons’ emotional exhaustion through two serial-multiple mediation paths. This research verified that customers' perception and responses to supplier’s CSR significantly influence B2B salesperson burnout.

[심포지엄 지상강좌 ③ ] 총의치 제작시의 교합형성

정창모 대한치과의사협회 2000 대한치과의사협회지 Vol.38 No.9

하악구치부 피질골 engagement가 임플란트 하중전달에 미치는 영향에 관한 3차원 유한요소법적 응력분석

정창모,Jeong, Chang-Mo 대한치과보철학회 1999 대한치과보철학회지 Vol.37 No.5

Cortical support is an important factor, as the engagement of the fixture in strong compact bone offers an increased load-carrying capacity and initial stability. Because of the poor bone quality in the posterior mandible and other anatomic considerations, it has been suggested that implant fixtures be placed in these locations with apical engagement of the lingual cortical plate for so-called bicortication. The purpose of this investigation was to determine the effect of cortical engagements and in addition polyoxymethylene(POM) intramobile connector(IMC) of IMZ implant on implant load transfer in edentulous posterior segment of mandible, using three-dimensional (3D) finite element analysis models composed of cortical and trabecular bone involving single implant. Variables such as (1) the crestal peri-implant defect, (2) the apical engagement of lingual cortical plate, (3) the occlusal contact position (a vertical load at central fossa or buccal cusp tip), and (4) POM IMC were investigated. Stress patterns were compared and interfacial stresses along the bone-implant interface were monitored specially. Within the scope of this study, the following observations were made. 1) Offset load and angulation of fixture led to increase the local interfacial stresses. 2) Stresses were concentrated toward the cortical bones, but the crestal peri-implant defect increased the interfacial stresses in trabecular bone. 3) For the model with bicortication, it was noticed that the crestal cortical bone provided more resistance to the bending moment and the lingual cortical plate provided more support for the vertical load. But Angulation problem of the fixture from the lingual cortical engagement caused the local interfacial stress concentrations. 4) It was not clear that POM IMC had the effect on stress distribution under the present experimental conditions, especially for the cases of crestal peri-implant defect.

총의치 제작시의 교합형성

정창모 대한치과의사협회 1999 대한치과의사협회지 Vol.37 No.11

서스팬션 슈우퍼엘리먼트 기법을 이용한 자동차의 동력학적 해석

정창모,유완석 대한기계학회 1988 대한기계학회논문집 Vol.12 No.3

본 연구에서는 자동차의 동력학적 해석을 위한 특별프로그램을 만들어서 범용 프로그램인 DADS와 효율성을 비교해 보고자 한다. Dynamic analysis of a vehicle is carried out with rigid body and flexible body models. The chassis of the vehicle is treated as flexible body in the flexible body model, and vibration normal modes are considered to account for elastic deformation of the component. Using output from the modal analysis in the finite element program, input data for the dynamic analysis with flexible body is generated. To achieve the computational efficiency, SUPERELEMENT technique is used for the vehicle suspension subsisted. The computer simulation time with suspension superelement was much reduced due to the reduction of coordinates and no kinematic constraint in the system.

심포지엄 : 소수 잔존치 환자의 임플란트 보철치료

정창모 대한치주과학회 2007 대한치주과학회 학술대회자료집 Vol.2007 No.1

골유착성 임프란트와 자연치를 이용한 고정성 국소의치에서 응력분산 및 충격흡수에 관한 유한요소법적 응력분석

정창모,이호용,Jeong Chang-Mo,Lee Ho-Yong 대한치과보철학회 1992 대한치과보철학회지 Vol.30 No.4

The long-term success of any dental implant is dependent upon the optimization of stresses which occur during oral function and parafunction. Especially, it has been suggested that there is an unique set of problems associated with joining an osseointegrated implant and a natural tooth with a fixed partial denture. For this particular case, although many literatures suggest different ways to avoid high stress concentrations on the bone surrounding the implant under static and dynamic loading conditions, but few studies on the biomechanical efficacy of each assertion have been reported. The purpose of this investigation was to evaluate the efficacies of clinically suggested methods on stress distribution under static load and shock absorption under dynamic load, using two dimensional finite element method. In FEM models of osseointegrated implant-natural tooth supported fixed partial dentures, calculations were made on the stresses in surrounding bone and on the deflections of abutments and superstructure, first, to compare the difference in stress distribution effects under static load by the flexure of fastening screw or prosthesis, or intramobile connector, and second, to compare the difference in the shock absorption effects under dynamic load by intramobile connector or occlusal veneering with composite resin. The results of this analysis suggest that : 1. Under static load condition, using an implant design with fastenign screw connecting implant abutment and prosthesis or increasing the flexibility of fastening screw, or increasing the flexibility of prosthesis led to the .increase in height of peak stresses in cortical bone surrounding the implant, and has little effect on stress change in bone around the natural tooth. 2. Under static load condition, intramobile connector caused the substantial decrease in stress concentration in cortical bone surrounding the implant and the slight increase in stress in bone around the natural tooth. 3. Under dynamic load condition, both intramobile connector and composite resin veneering showed shock absorption effect on bone surrounding the implant and composite resin veneering had a greater shock absorption effect than intramobile connector.

현행 세법상 계산서 교부 및 보고제도의 문제점과 개선방안

鄭昌模 한국조세연구포럼 2002 조세연구 Vol.2 No.-

임플란트 보철물에서 임시 시멘트의 인장 결합강도에 관한 연구

정창모,조재호 부산대학교 병원 암연구소 2006 부산대병원학술지 Vol.- No.20

The purpose of this study was to evaluate tensile bond strength of temporary cements used with cemented implant-supported prostheses. Prefabricated implant abutments, height 5mm, diameter 6mm, 3-degree taper per side, with light chamfer margins were used. Ten specimens of 2-unit bridge and single crown were fabricated. The luting agents used for this study were three commercially available temporary luting agents which were Temp bond, Temp bond NE, lRM. Each luting agent was mixed according to manufacturer's instructions, and a quantity of 0.1 ml, measured by means of insulin syringe, was applied for cementation of two unit bridge. 24 hours after cementation, the retentive strengths were measured by the universal testing machine with a cross-head speed of 0.5mm/min. Then cementation procedures were repeated and specimens were thermocycled 1000 times at temperature of 5℃ and 55℃. After thermocycling, the retentive strengths were measured by same means. Then, abutment surface was sandblasted with 50㎛ aluminum oxide and the retentive strengths of single crown were measured as 2-unit bridge. The results were as follows: 1. The retentive strengths of single crown with sandblasted abutment were decreased with the sequence of IRM, Temp bond NE, Temp bond(p<0.05). 2. The retentive strengths of two unit crown with non-sandblasted abutments were decreased with the sequence of IRM, Temp bond NE, Temp bond(p<0.05). 3. The retnentive strengths of all cements were decreased after thermocyling(p<0.05). 4. All cements except Temp bond NE showed no significant difference in comparison of before and after thermocycling retentive strength of single crown with sandblasted abutment and two unit bridge with non-sandblasted abutments. 5. Especially in Temp bond NE, after thermocylcing retentive strength of single crown with sandblasted abutment is more higher than of two unit bridge with non-sandblasted abutments.