Go to the main menu
Skip to content
Go to bottom
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 24, Issue 4 - Dec 2008
Volume 24, Issue 3 - Sep 2008
Volume 24, Issue 2 - Jun 2008
Volume 24, Issue 1 - Mar 2008
Selecting the target year
Characterization of the Stresses in the Luting Cement Layer Affected by Location of the Occlusal Points and Loading Direction on a Full Veneer Crown
Lee, Jung-Hoon ; Lee, Kyu-Bok ; Lee, Cheong-Hee ; Jo, Kwang-Hun ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 317~324
The objective of this study was to test effects of (1) where the occlusal contact points locate on a full veneer crown, and (2) which direction the contact forces are directed to, on the stresses within the luting cement layer that might suffer microfracture. A total of 27 finite element models were created for a mandibular first molar, combining 9 different locations of the occlusal contact points and 3 different loading directions. Type 3 gold alloy was used for crown material with a chamfer margin, and the luting cement material was glass ionomer cements in uniform thickness of 75 μm. Modeled crowns were loaded at 100 N. Different patterns in the cement stress were observed in the vicinity of the buccal and lingual margins. Whereas, the peak stress in buccal margin occurred approximately 0.5 mm away from the external surface, the highest stress in lingual margin was observed at approximately 1 mm. Significantly different distribution of stresses was recorded as a function either of the location of the occlusal contact points or of the loading direction. Higher stresses were produced by more obliquely acting load, and when the loaded point was in the vicinity of the cusp tip.
A Study on the Influence of Finishing and Polishing Methods on the Gap between Denture Base Resin and Soft Liner
Jung, Seung-Hwan ; Lee, Joon-Seok ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 325~335
The junction between resilient denture liner and the denture base is difficult to finish and polish due to difference of the physical property of the materials. Gaps tend to be formed during finishing and polishing procedures. The purpose of this study was measuring the width of junctional gap between Molloplast-B® and denture base material after finishing and polishing procedure, and evaluating the effect of method and direction on gap width. Molloplast-B® was processed (according to the manufacturer's instruction) against Lucitone 199® acrylic resin. 50 specimens were fabricated with a raised center section. All of specimens were examined and photographed with a stereoscopic microscope(x120), and the largest gap along the junction of Molloplast-B® and acrylic resin on each specimen was measured. One-way analysis of variance(ANOVA) and independent t-test at 95% confidence level were used to analyze the data and to compare groups. The results of this study were as follows. In comparison with finishing tools, the gap width was the largest in Molloplast®-Cutter and the smallest in FSQ-cross cut bur. There was statistically significant difference between FSQ-cross cut bur and Molloplast®-Cutter(p<0.05). There was no significant difference in gap width between the direction of polishing. The mean value of gap width was the smallest in case of no polishing, and the largest in case of polishing with pumice & tin oxide. There was statistically significant difference between pumice and pumice & tin oxide. From the results, it is concluded that the use of Molloplast®-Cutter in clinic need serious consideration even though it has good cutting ability. Further careful study is needed for finishing and polishing methods for decreasing gap width in junction of two materials.
Histomorphometry and Stability Analysis of Loaded Implants with two Different Surface Conditions in Beagle Dogs
Kim, Sang-Mi ; Kim, Dae-Gon ; Cho, Lee-Ra ; Park, Chan-Jin ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 337~349
Despite an improved bone reactions of Mg-incorporated implants in the animals, little yet has been carried out by the experimental investigations in functional loading conditions. This study investigated the clinical and histologic parameters of osseointegrated Mg-incorporated implants in delayed loading conditions. A total of 36 solid screw implants (diameter 3.75 mm, length 10mm) were placed in the mandibles of 6 beagle dogs. Test groups included 18 Mg-incorporated implants. Turned titanium Implants served as control. Gold crowns were inserted 3 months. Radiographic assessments and stabilitytests were performed at the time of fixture installation, 2nd stage surgery, 1 and 3 months after loading. Histological observations and morphometrical measurements were also performed. Of 36 implants, 32 displayed no discernible mobility, corresponding to successful clinical function. There was no statistically significant difference between test implants and controls in marginal bone levels (p=0.413) and RFA values. The mean BIC % in the Mg-implants was 54.4 ± 20.2%. The mean BIC % in the turned implant was 48.9 ± 8.0%. These differences between the Mg-implant and control implant were not statistically significant (P=0.264). In the limitation of this study, bone-to-implant contact (BIC) and bone area of Mg-incorporated oxidized implant were similar to machine-turned implant. The stability analysis showed no significantly different ISQ values and marginal bone loss between two groups. Considering time-dependent bone responses of Mg-implant, it seems that Mg-implants enhanced bone responses in early loading conditions and osseointegrated similarly to cp Ti implants in delayed loading conditions. However, further investigations are necessary to obtain long-term bone response of the Mg-implant in human.
Implant Supported Overdenture using Locator
System on Edentulous Patient
Lee, Sang-Yeob ; Shin, Soo-Yeon ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 351~359
It is difficult to provide prosthodontic treatment to fully edentulous patients with severe alveolar bone resorption, because this makes patents hard to endure functional load, and to adapt to the dentures, which result in emotional stress to patients. Implant supported overdenture can be chosen to solve these problems. Among several types of them, the implant retained and tissue supported overdenture, is available to the patients of low masticatory force with the reduced cost. Attachments also can be used for increasing retention and esthetics in dentures. Especially, Locator® system needs a small vertical interarch space for restoration and is able to compensate the difference of angle between fixtures. In this study, we restored maxilla with conventional complete denture, and mandible with implant and tissue supported overdenture and Locator® system.
Characteristics of Fluoride Releasing of Anodized Titanium Implant
Kim, Ha-young ; Song, Kwang-yeob ; Bae, Tae-sung ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 361~369
The purpose of this study is to make porous oxide film on the surfaces of pure Ti through anodic spark discharge in electrolytic solution containing calcium and phosphate ions, to improve osseointergration by treating fluoride agent. In addition, it is to evaluate the fluoride modified effect on the surface. Commercial pure Ti plate with 20×10×2mm and Ti wire with a diameter of 1.5mm and a total length of 15mm were used. After making titanium oxide films converted by anodic spark discharge, anodizing was performed. Fluoride was spreaded to titanium laboratory plate and maintained for 30 minutes after anodizing breakdown. Fluoride ion discharge amount was measured per 24 hours after dipping titanium plate into saline (10ml) and sustaining 90rpm in a pyrostat. Some plates and wires were dipped in Hanks solutions for a month to examine biocompatibility using SEM and XRD. TiO2 film formed by anodic discharge technique showed great roughness and uniform pores which were 1~3 ㎛ in a diameter. Roughness of the films treated with anodic discharge after blasting were higher than the turned ones(P<0.05). Rapid surface activity was observed in the samples treated with TiF3 agent, which immersed in Hanks solution for 30 days. Taking the results into consideration, the fluoride modified implant with anodic discharge demonstrates that it makes uniformly porous oxide film on the surface of implant and properly increase roughness for osseointegration. The implants will achieve greater bone integration after short healing time by improving surface activity.
Evaluation of Tightness of Proximal tooth Contact on Implant Prostheses
Kim, Sang-Pil ; Jung, Jae-Hyun ; Kang, Dong-Wan ; Oh, Sang-Ho ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 371~379
The aim of this study was to evaluate the tightness of proximal tooth contact(TPTC) using a novel device at rest state on implant prostheses. Ten healthy young adults with class I normal occlusion consented to participate in the study and twenty patients were restored with a total 20 single-implant crowns in the left maxillary and mandibular second molars for 10 single-implant crowns, respectively. Test area were divided by 4 groups. UM describes the contact between the upper natural left first molar and natural second molar; LM the contact between the lower natural left first molar and natural second molar; IUM the contact between the upper natural left first molar and implant second molar and ILM the contact between the lower natural left first molar and implant second molar. The TPTC was measured at rest state in each area. The mean TPTC of the UM, LM, IUM and ILM was 1.48(±0.44) N, 1.78(±0.40) N, 1.14(±0.37) N and 1.30(±0.32) N respectively. These results indicate that the TPTC was less between natural tooth and implant prosthesis than between natural teeth.
Retrospective Study of OSFE and Simultaneous Sintered Porous Surface Implant Placement
Moon, Kyung-Nam ; Kim, Hak-Kyun ; Park, Gwang-Bum ; Kim, Dong-Ju ; Sun, Ju-Rim ; You, Jae-Seek ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 381~388
Various techniques and diversely designed implants have been developed to overcome anatomic limitations of the maxillary posterior alveolar bone. The OSFE (osteotome sinus floor elevation) technique has been used for maxillary sinus augmentation. Also, EndoporeⓇ implant was designed to increase the surface area by its sintered porous surface. The purpose of this study was to evaluate the survival rate of EndoporeⓇ implants placed in the posterior maxilla in association with the elevation of the sinus membrane using OSFE technique, and examine the new bone formation in the sinus. One hundred fifteen EndoporeⓇ implants in 66 patients were placed in the posterior maxilla by OSFE technique. The implants were clinically and radiographically followed up for an average of 26.3 months. Most implants were stable and radiographs showed that the bone regenerated in contact with the implants. But, 5 implants in 4 patients were removed after the prosthetic restoration and the survival rate was 95.6% during the follow-up period. The height of new bone formed in the sinus was 3.26±1.04mm.
The Three Dimensional Analysis on Nasal Airway Morphology in Class III Malocclusion
Kim, Moon-Hwan ; Lee, Jin-Woo ; Cha, Kyung-Suk ; Chung, Dong-Hwa ;
Journal of Dental Rehabilitation and Applied Science, volume 24, issue 4, 2008, Pages 389~403
In Angle's Class III malocclusion, which has higher incidence in Korean than Western, depressed midfacial profile with protruded lower lips and mandible may give rise to many functional, esthetic, psychological, social problems. Due to the different malocclusion incidence according to racial differences, many previous studies focused on the relationship between Class II malocclusion and nasal airway obstruction. Previous studies used lateral cephalography which has limitations of 2 dimensional image with projection error and identification error. Therefore, the purpose of this study was to analyze morphologic differences in the nasal airway between normal occlusion and Angle's Class III malocclusion patients using 3-dimensional facial computed tomography. Thirteen normal occlusion(7 men and 6 women) and sixteen skeletal Class III(7 men and 9 women) patients were selected and 3-dimensional facial computed tomography taking was performed. Comparison between two group in volume and sectional area of nasal airway were carried out. The results were followed. 1. In the comparison of absolute nasal airway volume, oropharyngeal space of experimental group were larger than control group but there are no significant difference in other. 2. In the comparison of relative nasal airway volume, oropharyngeal space of experimental group were larger than control group but there are no significant difference in other. 3. In the oropharyngeal space width on frontal and lateral view, the similar tendency was revealed between two groups. 4. In the lateral curvature of nasal airway, the similar tendency was revealed between two groups.