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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Dental Rehabilitation and Applied Science
Journal Basic Information
Journal DOI :
Korean Academy of Stomatognathic Function and Occlusion
Editor in Chief :
Volume & Issues
Volume 29, Issue 4 - Dec 2013
Volume 29, Issue 3 - Sep 2013
Volume 29, Issue 2 - Jun 2013
Volume 29, Issue 1 - Mar 2013
Selecting the target year
Stress Analysis and Fatigue Failure of Prefabricated and Customized Abutments of Dental Implants
Kim, Hee-Eun ; Cho, In-Ho ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 209~223
DOI : 10.14368/jdras.2013.29.3.209
This study was to evaluate the stress distributions of prefabricated, customized abutments and fixtures according to their material and shape by three-dimensional finite element analysis. And to investigate the fatigue life and fracture characteristics. Mandibular models were fabricated by reconstruction of the CT scan of patients with normal occlusion. A total of six finite element models were designed, a load of 100 N was applied on the buccal cusps vertically, and 30 degree obliquely. 10 specimens each were fabricated for the more clinically widely used 4 type abutments and were loaded according to ISO 14801. Differences in stress distribution patterns were not found according to the materials of the abutments and fixtures. But a slight difference in the stress level was detected. Customized abutment groups showed lower crown stress levels. One-piece zirconia implant showed the lowest bone stress levels. In the fatigue test, highest values were measured in group 7. Prefabricated abutments showed less variation of fatigue life (P<0.05). Use of customized abutments can improve the fracture resistance of restorations. Especially, use of customized zirconia abutments reinforced by titanium screw connecting parts is recommended.
The Effects of Screw Retained Prosthesis Misfit & Cantilever on Stress Distribution in Bone Around the Implant
Lee, Jae-In ; Kim, Tae-Young ; Cho, Hye-Won ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 224~235
DOI : 10.14368/jdras.2013.29.3.224
A passively fitting prosthesis is an essential prerequisite to attain long-lasting success and maintenance of osseointegration. However, true "passive fit" can not be achieved with the present implant-supported prosthesis fabrication protocol. Many clinical situations are suitably treated with cantilevered implant-supported fixed restorations. The purpose of this study was to compare the stress distribution pattern and magnitude in supporting tissues around ITI implants with cantilevered, implant-supported, screw-retained fixed prosthesis according to the fitness of superstructures. Photoelastic model was made with PL-2 resin (Measurements, Raleigh, USA) and three ITI implants (
) were placed in the mandibular posterior edentulous area distal to the canine. Anterior and posterior extended 4-unit cantilevered FPDs were made with different misfit in the superstructures. 4 types of prosthesis were made by placing a
gap between the abutment and the crown on the second premolar and/or the first molar. Photoelastic stress analysis were carried out to measure the fringe order around the implant supporting structure under simulated loading conditions (30 lb).
An Evaluative Study on Forehead Morphology of Individuals with Normal Occlusion and Position of Maxillary Incisor in Accordance to Forehead Morphology
Lee, Su-Yong ; Lee, Jin-Woo ; Cha, Kyung-Suk ; Jung, Dong-Hwa ; Lee, Sang-Min ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 236~248
DOI : 10.14368/jdras.2013.29.3.236
In this study, 37 subjects with normal facial shape and normal occlusion are classified and reference value for such classification was investigated. Difference in position of maxillary incisor was studied according to the cl assification. Moreover, by investigating correlation between factors affecting forehead morphology and positio n of maxillary incisor, following results have been obtained. 1. Morphology of forehead can be classified as angular type, round type, straight type, and concave type. 2. There were no specific reference value for evaluation of forehead morphology but possibilities of evaluating forehead morphology using S value and forehead length (Tri-Gla) still remain. 3. There were no correlation between forehead morphology and position of maxillary incisor. 4. Forehead inclination and Andrew analysis show statistically significant negative correlation. That is, as forehead inclination increases, maxillary incisor is positioned posteriorly and this relationship can be shown as following equation, Andrew analysis = -0.39*Forehead inclination.
Effect of Head Positioning in Panoramic Radiography on the Vertical and Horizontal Magnification : Displacement along the Sagittal and Transverse Plane
Kim, Yong-Gun ; Lee, Young-Kyun ; An, Seo-Young ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 249~258
DOI : 10.14368/jdras.2013.29.3.249
The purpose of this study was to investigate how image magnification in dental panoramic radiography is influenced by object position. Five metal balls (4 mm in diameter, 2 for the anterior and 3 for the posterior region on the right side) were placed above alveolar crest of dry skull considering extraction socket and dental arch. Dry skull was radiographed using OP-100D (Instrumentarium Imaging Co., Tuusula, Finland) at proper and displaced position along the sagittal and transverse plane at 3 mm, 6 mm, 9 mm, 12 mm and 15 mm using special mount which can control precise movement. Images were stored in DICOM files and were measured by ruler equipped within INFINITT PACS software (Infinitt Co., Ltd., Seoul, Korea). The mean horizontal magnification was 1.224-1.439 and mean vertical magnification was 1.286 - 1.345 at proper position. Vertical magnification resulted in less variation (1.245-1.418) than horizontal magnification (0.798-6.297) according to the sagittal and transverse displacements. Head positioning is important for linear measurement on panoramic radiography and inclusion of standard object (for instance, metal ball) is helpful to anticipate exact magnification of panoramic radiographs at various location.
Finite Element Stress Analysis of Bone Tissue According to the Implant Connection Type
Byun, Ook ; Jung, Da-Un ; Han, In-Hae ; Kim, Seong-Ryang ; Lee, Chang-Hee ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 259~271
DOI : 10.14368/jdras.2013.29.3.259
The purpose of this study was to make the stress distribution produced by simulated different load under two types of internal connection implant system (stepped and tapered type) by means of 3D finite element analysis, The finite element model was designed with the parallel placement of the one fixtures (
) with reverse buttress thread on the mandibular 1st molar. Two models were loaded with 200 N magnitude in the vertical direction on the central position of the crown, the 1.5 mm and 3 mm buccal offset point from the central position of the fixture. The oblique load was applied at the angle of
on the crown surface. Von Mises stress value was recorded and compared in the fixture-bone interface in the bucco-lingual dimension. The results were as follows; 1. The loading conditions of two internal connection implant systems (stepped and tapered type) were the main factor affecting the equivalent bone strain, followed by the type of internal connections. 2. The stepped model had more mechanical stability with the reduced max. stress compared to
tapered models under the distributed oblique loading. 3. The more the contact of implant-abutment interface to the inner wall of implant fixture, the less stress concentration was reduced.
Initial Changes of Implant Stability from Installation during Early Bone Healing
Park, Chan-Jin ; Kim, Dae-Gon ; Cho, Lee-Ra ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 272~279
DOI : 10.14368/jdras.2013.29.3.272
The concept of implant stability was basically originated from the relative condition of bone-implant interface and has some meanings for evaluation of that interface. In addtion, it has been used for the investigation of initial bone healing process after fixture installation because a degree of micromotion around interface can affect unfavorable clinical results. The purpose of this study is to investigate the mode of initial bone healing from fixture installation through prospective trial. Thirty fixtures were consecutively installed in mandibles of 26 patients with single tooth loss area and then healing abutment were secured for one-stage surgery meothod. Resonance frequency analysis was performed with one week interval during 12 weeks and periapical radiographs were taken at each month. Although marginal bone level change was not shown through observation period (P>0.05), statistical difference of implant stability was shown through 4 and 6 week (P<0.05) and was not shown after 6 week (P>0.05) according to the bone quality. Initial bone healing process is a successive process of bone resorption and favorable bone healing result might be postulated at 4 week interval after installation through RFA.
The Fabrication of Accurate Removable Partial Denture by Analyzing the Failed Cases
Lee, Ji-Young ; Lee, Kyoung-Lok ; Heo, Yu-Ri ; Son, Mee-Kyoung ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 280~289
DOI : 10.14368/jdras.2013.29.3.280
Removable partial denture for oral function recovery of partial edentulous patients is a complicated treatment because the dentist should consider both hard tissue and soft tissue. Removable partial denture produced without consideration of precise design for each component and rotation of denture may cause fracture, deformation or loss of abutment teeth. In case of failure to achieve a proper denture, the reason of failure should be analyzed and the result must be applied to later RPD cases. Finding the solutions through the failed denture cases will help patients use their dentures more comfortably and keep their sound residual teeth and tissue longer.
A Review of a Smart Dental Prosthesis using Micro-electro-mechanical System
Namgung, Cheol ; Kim, Myung-Joo ; Kwon, Ho-Beom ; Lim, Young-Jun ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 290~298
DOI : 10.14368/jdras.2013.29.3.290
It will be possible to predict the success and failure of the prosthodontic treatment and prevent clinical complications if the oral environment including prostheses and their supporting teeth and periodontium can be monitored in real time. The aim of this report is to introduce the concept of a smart prosthesis, which monitors specific factors in the oral cavity, and investigate its feasibility through a literature review of MEMS (Micro-electro-mechanical System) and Biosensing.
Initial Placement of Removable Partial Dentures
Shin, Soo-Yeon ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 299~307
DOI : 10.14368/jdras.2013.29.3.299
The overall objective of fitting removable partial dentures at initial placement is to ensure that the patient is given the best possible start with the new prostheses. This may be achieved by checking that: (1) final inspection of the prosthesis, (2) seating of the RPD framework, (3) evaluation of denture base adaptation, (4) assessment of denture base peripheral extensions, (5) occlusal adjustment, (6) remounting the prosthesis, and (7) instructions to the patient.
Applying the New Technology for Making Pontic Ridge Lap in Posterior Bridge Restoration
Kim, Wook-Tae ;
Journal of Dental Rehabilitation and Applied Science, volume 29, issue 3, 2013, Pages 308~316
DOI : 10.14368/jdras.2013.29.3.308
The purpose of this study is to investigate the production method of posterior bridges pontic ridge lap type which prevents the infection in bridge pontic base and is able to cleanse itself, in the process of producing final prothesis that maintains healthy mucous membrane of oral cavity and interproximal papilla, minimizing diastema, is aesthetic and has no effect on pronunciation. New technology is applied to make optimal pontic base which prevent inflammation and clean itself and its products were clinically evaluated in 10 places of dental clinics in busan and gyeongnam. The making of posterior 3 unit bridge pontic base, it was presented as the new technology of forming ridge lab type and to carry out clinical validation, existing conventional method and the new technology were compared. Pontic base made with the existing conventional method cause infection and other periodontal disease by 96% but the pontic base made with the new technology cause infection and other periodontal disease by 3%. Remains of food cause infection and other periodontal disease 100% by the existing conventional method and 91% by the new technology, showing a distinct difference. However, after a gargle, the new technology had low 13%. Additionally, the pontic base made with the existing conventional method showed 71% of chance, the new technology method showed 8% of chance in terms of self-cleansing.