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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 25, Issue 4 - 00 2009
Volume 25, Issue 3 - 00 2009
Volume 25, Issue 2 - 00 2009
Volume 25, Issue 1 - 00 2009
Selecting the target year
The Effect of Surface Treatment on the Shear Bond Strength of Resin Cement to Zirconia Ceramics
Jung, Seung-Hyun ; Kim, Kye-Soon ; Lee, Jae-In ; Lee, Jin-Han ; Kim, Yu-Lee ; Cho, Hye-Won ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 83~94
The aim of this study was to investigate the shear bond strength between zirconia ceramic and resin cement according to various surface treatments. The surface of each zirconia ceramic was subjected to one of the following treatments and then bonded Rely X Unicem or Rely X ARC resin cement; (1) Rocatec system and 50
surface polishing, (2) No treatment and 50
surface polishing, (3) Rocatec system and 1
surface polishing, (4) No treatment and 1
surface polishing. Each of eight bonding group was tested in shear bond strengths by universal testing machine(Z020, Zwick, Ulm, Germany) with crosshead speed of 1mm/min. The results were as follows; 1. Rocatec treatment groups showed greater bonding strengths than No Rocatec groups. There was significant difference of among groups(P<0.001) 2. For Rocatec groups, 50
surface roughness groups showed greater bonding strengths than 1㎛ surface roughness groups.(P<0.001) But for No Rocatec groups, There was no significant difference of among groups(P>0.05) 3. Rely X Unicem groups showed greater bonding strengths than Rely X ARC groups. There was significant difference of among groups(P<0.01) Within the conditions of this study, Rocatec treatment was an effective way of increasing zirconia bonds to a resin cement, even in the case of self-adhesive resin cement.
The Influence of Microwave Sintering Process on the Adaptation of CAD/CAM Zirconia Core
Kim, Keun-Bae ; Kim, Jee-Hwan ; Lee, Keun-Woo ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 95~107
The purpose of this research was to examine the fitness of zirconia cores that were made by different sintering methods; generic electricity furnace and microwave furnace. Firstly, 12 cores for each group were made by using each different sintering process and attached them to a metal die with silicon. The internal and marginal gap of sintered zirconia was measured by using Skyscan 1076 micro-CT, then it was reorganized by CT-An software. To each samples, we extracted B-L image, M-D image of cutting side, and cross-sectional side of tooth long axis and calculated the mean value of marginal, axial, and occlusal gap each side. Results: 1. The mean marginal gap of sintered zirconia was 36.20
for EVE, 47.67
for LAV, 52.47
for DEN, and 54.63
for CER. 2. For the axial wall, the research showed the largest value of 63.49
for EVE, but there were no statistical significance. 3. In related to the occlusal internal measurement, DEN showed the smallest value (77.06
), EVE and CER showed significantly high value. From this study, it is suggested that CAD/CAM zirconia core which was made in the process of microwave sintering has clinically acceptable values in marginal and internal gap.
Effect of Bone Quality on Insertion Torque during Implant Placement; Finite Eelement Analysis
Jeong, Jae-Doug ; Cho, In-Ho ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 109~123
The aim of the study was to assess the influence of insertion torque of bone quality and to compare axial force, moment and von Mises stress using finite element analysis of plastoelastic property for bone stress and strain by dividing bone quality to its thickness of cortical bone, density of trabecular bone and existence of lower cortical bone when implant inserted to mandibular premolar region. The Br
nemark MKIII. RP implant and cylindrical bone finite model were designed as cortical bone at upper border and trabecular bone below the cortical bone. 7 models were made according to thickness of cortical bone, density of trabecular bone and bicortical anchorage and von Mises stress, axial force and moment were compared by running time. Dividing the insertion time, it seemed 300msec that inferior border of implant flange impinged the upper border of bone, 550msec that implant flange placed in middle of upper border and 800msec that superior border of implant flange was at the same level as bone surface. The maximum axial force peak was at about 500msec, and maximum moment peak was at about 800msec. The correlation of von Mises stress distribution was seen at both peak level. The following findings were appeared by the study which compared the axial force by its each area. The axial force was measured highest when Br
nemark MKIII implant flange inserts the cortical bone. And maximal moment was measured highest after axial force suddenly decreased when the flange impinged at upper border and the concentration of von Mises stress distribution was at the same site. When implant was placed, the axial force and moment was measured high as the cortical bone got thicker and the force concentrated at the cortical bone site. The influence of density in trabecular bone to axial force was less when cortical bone was 1.5 ㎜ thick but it might be more affected when the thickness was 0.5 ㎜ . The total axial force with bicortical anchorage, was similar when upper border thickness was the same. But at the lower border the axial force of bicortical model was higher than that of monocortical model. Within the limitation of this FEA study, the insertion torque was most affected by the thickness of cortical bone when it was placed the Br
nemark MKIII implant in premolar region of mandible.
The Study of Bone Healing Response According to the Various Surfaces of the Implant in the Mandible of the Mature Dog
Lim, Hyun-Pil ; Kim, Yong-Hak ; Vang, Mong-Sook ; Yang, Hong-So ; Park, Sang-Won ; Choi, Hong-Ran ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 125~137
There are many reports that these implant surface treatments may affect to cellular reaction in the surface of implant. This study was done by installing the 8 type implant with the variable surface treatment, used or developed, in the mandible of the mature dog to evaluate how the method of surface treatment of the implant can affect to the bone healing by analyzing histologically and histomorphometrically and find out bone healing appearance periodically after installing implant. By using the 8 type implants which have the different surface treatment, 72 implants were installed on the mandible of 9 mature dogs, and 3 dogs were sacrificed on every 2, 4, 8 weeks. After making bone fragment by cutting and managing, we analyzed histologically, then compared with BIC(Bone to implant contact) for the histomorphometrical analysis. In the result of histological analysis, there was large amount of bone formation in good state on the adjacent area of implant in the 2 weeks testing group. At 4 weeks, although there was general bone formation, the new bone was separated with the basal bone. At 8 weeks, the new bone became matured and connected tightly to the basal bone. There was no difference in the each surface of 8 implants. In the result of histomorphometrical analysis, 2 weeks group had considerably lower value than 4 and 8 weeks group, and there was no difference between 4 and 8 weeks group. There was no difference in the each surface treatment of implants.
The Biological Stability of Immediate Placement of Tapered Implants in Tooth Extraction Sites
Park, Ja-young ; Bae, Ah-Ran ; Kim, Hyung-Seub ; Kwon, Yong-Dae ; Lee, Baek-Soo ; Kwon, Kung-Rock ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 139~155
Objective : To assess the biological stability of immediate transmucosal placement of tapered implants into tooth extraction sockets. Material and methods : Following tooth extraction, tapered implants were immediately placed into the sockets. Teeth with evidence of acute periapical pathology were excluded. After implant placement, sutured allowing a non-submerged, transmucosal healing. Standardized radiographs were obtained every visiting from baseline to 32 weeks after implant placment. Changes in depth of the distance from the implant shoulder (IS) and from the alveolar crest (AC) to the bottom of the defect (BD) were assessed. Results : Thirteen patients (10 males and 3 females) were enrolled and followed. They contributed with 15 tapered implants. extraction iste displayed sufficient residual bone volume to allow primary stability of all implants. The mean surgery time was 41
10.0 mins. All implants healed uneventfully yielding a survival rate of 100%. Mean ISQ values were relatively stable. Interproximal crestal bone decreased 1.69
1.2 mm (mesial), 1.65
1.2 mm (distal) from baseline to 32-week follow-up. No statistically significant changes with respect to FMPS, FMBS, PPD and width of KG were observed. Conclusions: Immediate transmucosal implant placement represented a predictable treatment option for the replacement of teeth lost due to reasons including fractures, endodontic failures and caries.
Influence of the Dental Implant Abutment Screw Coating Materials on Joint Stability
Lim, Hyun-Pil ; Park, Young-Sun ; Vang, Mong-Sook ; Yang, Hong-So ; Park, Sang-Won ; Yoon, Suk-ja ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 157~169
The aim of this study was to evaluate effect of implant abutment screw coating treatment on joint stability, investigating mechanical properties of these. For this study used
external hexed implant system and 15 ㎜
1 ㎜ discs . Experimental group was 1 ㎛ TiN, TiCN, TiC coated abutment screws and discs .To know mechanical property, i evaluated adhesion strength, surface hardness, using disc, corrosion test using screw. The results were as follows : rotation angle of coated screws increased than that of non-coated screw because of lower friction coefficient, especially TiC coated screw group had the largest value, but removal torque decreased in all coated screws (p<0.05). Torque loss before and after fatigue test was the smallest in TiC-coated screws, and the largest in non-coated screws (p<0.05), and there was no statistically significant difference between dry condition and wet condition of screws because of higher surface hardness and lower friction coefficient. From the above results, TiN, TiCN, TiC coating group had high abrasion resistance, especially TiC coated group which had low torque-consuming, high rotation angle as low friction coefficient will be considered to influence on implant abutment screw joint stability positively.
Finite Element Analysis of Stress Distribution in using Face Mask according to Traction Point
Oh, Kyo-chang ; Cha, Kyung-Suk ; Chung, Dong-Hwa ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 171~181
The objective of this study was to analyse stress distribution of maxillary complex by use of face mask. The construction of the three-dimensional FEM model was based on the computed tomography(CT) scans of 13.5 years-old male subject. The CT image were digitized and converted to the finite element model by using the mimics program, with PATRAN. An anteriorly directed force of 500g was applied at the first premolar 45 degrees downwards to the FH plane and at the first molar 20 degrees downwards to the FH plane. When 45 degrees force was applied at maxillary first premolar, there were observed expansion at molar part and constriction at premolar part. The largest displacement was 0.00011mm in the x-axis. In the y-axis, anterior displacement observed generally 0.00030mm at maximum. In the z-axis, maxillary complex was displaced 0.00036 mm forward and downward. When 20 degrees force was applied at maxilla first molar, there were observed expansion at lateral nasal wall and constriction at molar part. The largest displacement was 0.001mm in the X-axis. In the Y-axis, anterior displacement observed generally 0.004mm at maximum. In the Z-axis, ANS was displaced upward and pterygoid complex was displaced downward. The largest displacement was 0.002mm.
Investigation on Formation of Nanotube Titanium Oxide Film by Anodizing on Titanium in NaF Electrolytes
Lim, Hyun-Pil ; Park, Nam-Soon ; Park, Sang-Won ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 183~190
The aim of this study is to find the condition of forming the favorable nanotubes by anodizing with NaF and H3PO4. Machined Ti discs were used for anode, and Platinum net was used for cathode. For electrolyte,
and NaF solution were mixed. We controlled voltage, electrolyte concentration, anodizing time and formed nanotubes on Ti discs. After that, these were washed with distilled water for 24 hours and dried in the 40
oven for 24 hours. The surface structure of specimens were analyzed. The results were as follows : At 0.5 wt % NaF, according as increasing voltage and anodizing time, early state of nucleating pores were generated. At 1.0 wt % NaF, 20 V, 20 & 25 min, well-formed nanotubes were observed. At 1.0 wt % NaF, 30 V, structure of nanotube became bigger and interconnected. At 2.0 wt % NaF, no nanotubes were formed and it was unrelated with voltage and time. At 1.0 wt % NaF, 20 V, 20 - 25 min, well-ordered nanotubes were generated on Ti discs. For the formation of favorable nanotubes, it is considered that proper parameters such as electrolyte concentration, voltage, anodizing time are necessary according to the kind of electrolytes.
Isolation and Culture of Dental Pulp Stem Cells from a Supernumerary Tooth
Ahn, So-Youn ;
Journal of Dental Rehabilitation and Applied Science, volume 25, issue 2, 2009, Pages 191~200
Dental Pulp Stem Cells are superior to other types of adult stem cell. Because of teeth are easy to access and are extracted throughout life. A supernumerary tooth is an important clinical problem found in various populations of the world. The incidence of supernumerary teeth varies depending on the literature source. Pediatric dentists are routinely extracted them. However, no studies have been reported regarding Dental Pulp stem cells in a supernumerary tooth, and we failed to note that a valuable source of human stem cell. Herein, we tried to show that a supernumerary tooth contains cells that display the characteristic features of stem cells.