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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 27, Issue 4 - Dec 2011
Volume 27, Issue 3 - Sep 2011
Volume 27, Issue 2 - Jun 2011
Volume 27, Issue 1 - Mar 2011
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Removal Torque Values of Retaining Screws Tightened to Implant-Supported Prosthesis with Different Connection Systems by Various Tightening Technique
Kim, Dong-Wook ; Choi, Yu-Sung ; Jo, In-Ho ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 343~358
As implant treatment has become popular, lots of different shapes and materials of the implant upper component have been supplied. And there are also diverse reports about failures including loosening of the abutment screw which is one of the most common reason. Purpose : The purpose of this study is to find out how different screw tightening orders and methods influence on screw loosening according to the different connection systems. The upper component was fabricated by casting method. After fabricating master models that are precisely attached to the upper component, 5 experimental models each for the external connection system and internal connection system were fabricated using splinting impression technique. First, to find out the influence of the screw tightening order, screws were tightened in 3 orders; 1-2-3-4, 2-3-1-4, 2-4-3-1. After tightening, removal torque values (RTV) of each group was measured. And also to find out the influence of screw tightening method, a model with 2-3-1-4 screw tightening order was tightened with 30 Ncm at one time(1-step method) and the RTV was compared with the same order group (2-3-1-4) in the 2 step method. In the external connection system, RTV appeared significantly lower in group 2-3-1-4 than group 2-4-3-1 (p<0.05). And also in the internal connection system, the RTV of group 2-3-1-4 appeared significantly lower than that of group 2-4-3-1 and 1-2-3-4 (p<0.05). When comparing the tightening number of the screw without considering the screw tightening order, the first tightened screw appeared significantly higher RTV than the second one in the external connection system (p<0.05), however there was no significant difference from the first tightened screw to the last tightened screw in the internal connection system. And there was no statistically significant difference between the two screw tightening methods in both internal and external connection system. In the comparison of external and internal connection system, each RTV appeared 16.27 Ncm and 14.25 Ncm and appeared as a statistically significant difference (p<0.05). There was a significant difference in RTV measured according to the screw tightening order. The lowest RTV appeared in the groups started tightening from the middle. There was also a significant difference in RTV between the two connection system groups. A further study is needed to find out the influence factors in RTV and also a study is required related to the load condition.
Fractal Analysis of Peri-Implant Bone Mineral Density before and after Functional Loading on Implant
Hong, Seong-Wan ; Lee, Jae-In ; Cho, Hye-Won ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 359~370
To identify osseointegration of implants, dentists were performed the radiographic analysis. The fractal analysis methods using periapical radiographs before and after loading on implants was to evaluate whether or not significant. 30 patients who were placed implants in dental hospital of Wonkwang university were participated in this study. Total of 42 implants were analyzed. And, 14 males and 16 females aged from 22 to 73 participated in this study. The two morphologic and Fractal analysis of the one trabecular patterns in alveolar bone were done using periapical views. Two periapical views, after implant placement, and after 2 months of functional loading were analysed. The analysis was done by software, Image J(1.40s, National Institute of Health, Bethesda, USA). The data were statistically analyzed using one-way ANOVA(P<.05). Multiple comparison was done by the Tukey HSD test. The results of Fractal analysis and change in bone density around implants showed significantly different values, especially mandibles. However, in case of implants with failure, Fractal values decreased from 1.2865 to 1.1521 and 1.1135 to 1.0478.
Three Dimensional Finite Element Analysis on Stress Distribution According to the Bucco-lingual Inclination of the Implant Fixture and Abutment in the Mandibular Posterior Region
Lee, Hyun-Sook ; Kim, Ji-Youn ; Kim, Ye-Mi ; Kim, Myung-Rae ; Kim, Sun-Jong ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 371~392
The purpose of this study was to comparatively analyze the stress distribution according to the inclinations of abutments and angulations of the implant fixtures under occlusal loading force. Three study models with straight and
-angled abutments were prepared following the insertion of Implants parallel to the long axis of the tooth. Additional two experimental models were fabricated with
fixture inclinations. Using ANSYS 11, a finite element analysis program, the magnitudes of stress distribution were analyzed. The magnitude of stress under loading was lowest when the load was applied vertically onto the axis of implant. And the magnitude of stress under compound(vertical+oblique) loading was increased as the inclination of implant abutment and fixture was increase. But, the distribution of stress was different as the loading conditions, because of the horizontal offset. As the offset between the axis of loading and the central axis of the implant increased, the stress was increased.
3-Year Survival Analysis of RBM and Acid-Etched Surface Implants
Yoon, Dae-Woong ; Kim, Moon-Seob ; Jang, Han-Seung ; Jin, Soo-Young ; Mah, Deuk-Hyun ; Jeong, Gyeong-Dal ; Park, Hyun-Chun ; Kim, Hee-Jung ; Kim, Hak-Kyun ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 393~403
The purpose of this study was to analyze and compare survival rates of resorbable blast media(RBM) surface and acid-etched surface implants being usually used in clinics. RBM surface implants (USII, Osstem, Busan, Korea) or acid-etched surface implants (
, FL, USA) were placed in edentulous area of 140 patients between January of 2005 and March of 2007. The number of implants was 304, and 152 out of them were RBM surface implants while another 152 were acid-etched surface implants. According to the evaluation items, the survey was performed before and after the implants installations. The 3-year survival rates of both kind of implants were calculated. 1. Total of 152 RBM surface implants were placed. Among them, one implant was failed, which was implanted in the posterior mandible with D2 bone quality. The failure was resulted from fracture of the fixture. Others showed good results and survival rate of RBM surface implant was 99.34%. 2. Total of 152 acid-etched surface implants were placed. Seven implants of them were failed, thus, survival rate was 95.39%. The causes of the failures were considered as infection, overheat and the lack of initial stability. In this research, both implants showed good 3-year survival rate, although RMB surface implant represented a better result.
Implant stability installed with CAD-CAM assisted flapless surgery : A pilot study
Park, Chan-Jin ; Kim, Dae-Gon ; Cho, Lee-Ra ; Kashiwagi, Kosuke ; Kawazoe, Takayoshi ; Tanaka, Masahiro ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 405~413
It was proposed that technologies derived from CAD-CAM and computed tomography may be useful for flapless implant treatment procedures. The aims of this study were to validate the reliability of this concept in a prospective 12-month clinical study. Twelve patients with fully edentulous areas in their mandibles were included in this study. A total of 71 implants were inserted in interforaminal regions by use of a CAD/CAM drill template(
), specially designed for flapless implant surgery. To assess the degree of pain and discomfort, the patients were examined at 2 days and 1 week after surgery. Patient satisfaction and implant functionality were further evaluated at follow-up intervals of 1, 3, 6, and 12 months postoperatively. One implant failed early in 1 patient. All of the other implants were in a good functional state throughout the study. The mean marginal bone loss after 1 year of follow-up was 0.3 mm (SD, 0.1) at center, 0.5 mm (SD, 0.1) at canine and 0.7 mm (SD, 0.2) at distal fixtures, respectively. Statistically, there was not significant differences among each sites(P>.05)The mean ISQ change after 1 year of follow-up was -1.05 (SD, 2.76) at center, -0.85 (SD, 2.59) at canine and -1.27 (SD, 2.18) at distal fixtures, respectively. This prospective pilot study showed that the use of CAD/CAM technology and flapless implant surgery may be considered reliable for fully edentulous mandible of patients.
Correlation between The Parents' Character of Orthodontic Patients and Patients Cooperation
Kim, Jong-Oh ; Chung, Dong-Hwa ; Lee, Jin-Woo ; Cha, Kyung-Suk ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 415~422
The study on correlation between the parents' character of orthodontic patients and patients cooperation. Although dentists have excellent skill and technique, patients' cooperation is always demanded. Patients' poor cooperation results in poor treatment result. Cooperation between psycho-social state of parents and patient's cooperation was studied. The parent's psychosocial state is evaluated with scl-90-r. The cooperation is measured by appointment time compliance, appliance taking rate, breakage of appliance, and fee paying. Parents' psychosocial contents are somatization, obsessive-compulsive, interpersonal sensitivity, depression, anxiety, hostility, phobic-anxiety, paranoid ideation, psychoticism, and additional item. Statistics was done by SPSS WINDOW version 12.0 program. The result showed no correlation between patients' cooperation and their parents' psychosocial state. There is no correlation between father's psychosocial state and patients' cooperation except psychoticism. There is no correlation between mother's psychosocial state and patients' cooperation. However, there was correlation among cooperation variables: appointment time compliance, appliance taking rate, breakage of appliance, cost paying. Appliance taking rate and cost paying showed positive correlation. Our findings suggest that patients' cooperation does not followed their parents' pychosocial state. Other combined factors should be considered like pychosocial state of patient and doctor-patient relationship.
A Literature Review on Trauma from Occlusion
Park, Go-Woon ; Kim, Dae-Gon ; Park, Chan-Jin ; Cho, Lee-Ra ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 423~436
Trauma from occlusion (TFO) is a pathologic alterations which develop in the periodontium as a result of undue masticatory force. The purpose of this article is to review the controversies about TFO. There are evidences that TFO is a risk factor in the progression of periodontitis. Tooth mobility should be reduced by selective occlusal adjustment. TFO can be developed dependent on the masticatory pattern, occlusion and anterior overbite in sound periodontal conditions. Secondary TFO may aggravate unstable occlusion. If "loss of posterior support" was occur, the problems were worsen. Extrusion, migration, rotation and pathologic deviation can be resulted. Opposite contention is the "shortened dental arch" concept. However, these two concepts persue the occlusal stability together. To treat TFO adequately, exact diagnosis and multi-disciplinary treatment should be needed.
Distal-Extension Removable Partial Denture with Anterior Implant Prostheses: Case Report
Na, Hyun-Joon ; Kang, Dong-Wan ; Son, Mee-Kyung ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 437~447
In patients who used removable partial dentures for a long period of time, gradual alveolar bone resorption occurs in edentulous area. However, in residual teeth area, alveolar bone is maintained sound. This causes an imbalance in intermaxillary distance between a maxillae and a mandible which is intensified due to expansion in vertical and horizontal bone amount difference between the two area as time passes. As the result, this shows a substantial difference in vertical position according to the period of teeth loss even after residual teeth loss. As in this situation, a patient with bilaterally and anterio-posteriorly different intermaxillary distance, various prosthodontic problems can be caused in fixed implant prosthodontics and implant overdenture. This study shows a case in which implant-supported removable partial denture was fabricated considering residual alveolar bone height after teeth loss in a patient who had been using a distal extension removable partial denture for a long period of time. In anterior area with short intermaxillary distance, fixed prosthodontics were fabricated with implant placement and in posterior area with long intermaxillary distance, a removable partial denture was fabricated. Finally, a small number of implants were placed without additional surgery and economical and comfortable treatment results were shown.
Bisphophonate-Related Osteonecrosis of the Jaw (BRONJ)
Kim, Hyeon-Mook ; Park, Chan-Jin ;
Journal of Dental Rehabilitation and Applied Science, volume 27, issue 4, 2011, Pages 449~454
Recently, jawbone osteonecrosis has been largely reported as a potential adverse effect of bisphosphonate (BP)administration. Currently available published incidence data for BRONJ are based on retrospective studies and estimates of cumulative incidence range from 0.8 to 12%. The mandible is more commonly affected than the maxilla (2:1 ratio), and 60-70% of cases are preceded by a dental surgical procedure. The signs and symptoms that may occur before the appearance of clinical evident osteonecrosis include changes in the health of periodontal tissues, non-healing mucosal ulcers, loose teeth and unexplained soft-tissue infection. Tooth extraction as a precipitating event is a common observation. The significant benefits that bisphosphonates offer to patients clearly surpass the risk of potential side effects; however, any patient for whom prolonged bisphosphonate therapy is indicated, should be provided with preventive dental care in order to minimize the risk of developing this severe condition.