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Article
Radiographic follow up for clinical cases of mandibular implant retained overdenture MIR-OD

Authors: Raghdaa K. Jassim رغداء جاسم --- Ibrahim K. Ibrahim
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 2 Pages: 7-11
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The use of osseointegrated fixtures in dentistry has been demonstrated both histologically and clinicallyto be beneficial in providing long term oral rehabilitation in completely edentulous individual. Most patients sufferfrom denture instability; particularly with mandibular prosthesis, the use of dental implant will be benefit significantlyfrom even a slight increase in retention. The concept of implanting two to four fixtures in a bony ridge to retain acomplete denture prosthesis appealing therefore, as retention, stability and acceptable economic compromise tothe expanse incurred with the multiple fixture supported fixed prosthesis .Materials and methods in this study the sample were eight patients selected from a hospital of specialized surgery,these patient were wearing a mandibular implant retained over denture for two years these patients having MIR-ODwith Bar-clip, ball-cup and O- ring attachments. Preparative radiography was obtained for this patient from thecenter .these radiograph was taken to the patient at time of insertion. The second radiograph image was taken tothe patient after two years of function with prosthesis. .the scanned images were transfer to special folder in acomputer then analysis of bone loss done using Dimax software. After that an accurate calibrations of crestal bonemeasurement were analyzed for both groups of Radiography .Results it was appeared that the amount of bone loss in ball and bar designs (of mandibular Implant retainedoverdenture) were within the criteria of successful rate of bone loss during the period of examination, and there wasstatistically significant difference between both types of anchorage system.Conclusions The amount of bone loss was 0.1 mm after two years follow up, and it was within the acceptable limits ofbone lose. A significant difference appeared between both designs of MIR-OD, Ball and bar designs

Keywords

Radiograph --- implant --- overdenture --- Dimax


Article
Finite element stress analysis study for stresses around mandibular implant retained overdenture MIR-OD

Authors: Raghdaa K. Jassim رغداء جاسم --- Ibrahim K. Ibrahim
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 2 Pages: 30-36
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: It has been well known that the success of mandibular implant- retained overdenture heavily dependson initial stability, retention and long term osseointegration this is might be due to optimal stresses distribution insurrounding bones. Types of mandibular implant- retained overdenture anchorage system and number of dentalimplants play an important role in stresses distribution at the implant-bone interface. It is necessary to keep thestresses below the physiologic tolerance level of the bone .since. And it is difficult to measure these stresses aroundbone in vivo. In the present study, finite element analysis used to study the stresses distribution around dental implantsupporting Mandible implant retained overdentureMaterials and methods: Eight models were constructed including four designs of anchorage system (ball-cup, ball-ORing, bar without distal extension and bar with distal extension).The first group of models were supported by fourdental implant and second group of models were supported by two dental implant only. Models constructed fromthe data obtained directly from patient The contour of bone was obtained from C.T scan image of patient, thendata transferred to ANSYS program for modeling then load applied and solve the equation by the program,Specified nodes were selected at the rings of crestal bone (cortical bone) and cortical cancellous interface aroundeach dental implant and fixed for all models to monitor the stress change in that regions of different design of MIROD..After load application, Specified nodes were selected at the rings of crestal bone (cortical bone) and corticalcancellous interface around each dental implant and fixed for all models to monitor the stress change in thatregions of different design of MIR-OD .Results: In the present study the stress distribution and maximum stresses value around dental implant had arelationship to the number of dental implant. , The result appeared that the maximum stresses and means of stressesvalue was lower in the first group of models (which was supported through the use four dental implant) than thesecond group of models (which was supported through the use of two dental implant only). For the first group ofmodels the maximum stresses value around mesial implant was11.67, 10.51, 10.98 and 10.72 Mpa, while the maximumstresses around distal implant was 21.33, 18.51, 18.86, and17.56 Mpa for models 1,2,3 and 4respectively ,and thestresses around implant supporting second group of models was 22.52, 22.16, 20.51 and 19.60 Mpa for models5,6,7and8 respectively .Statistical analyses of means value appeared that there was statistically significant differencein stresses means value around implant of the second group with that’s values around mesial and distal implantsupporting first group of model . Regarding the result of both ball and bar system, it has been demonstrated thatstress was greater with ball attachment and MIR-OD supported by the use of four dental implants and anchored bybar attachments with distal extension gives the minimum values of stresses than the rest models. Also the results showthat higher stresses value was appeared at the cortical bone ring surrounding dental implant especially the distalimplant nearest to the free end extension area. Also it was appeared that the best model was Mandible implantretainedoverdenture that’s anchored by bar with distal extension and support by four dental implant .Conclusions: Bar-clips with distal extension mode of attachment considered the best type in producing the leaststresses around dental implant regardless number of dental implant used

Keywords

Implant --- overdenture --- stresses --- bar --- ball


Article
Evaluation of the Effect of Implant-numbers, Position and Complete Over Denture on Alveolar Bone Resorption

Authors: Ali M. AlSheakh --- Nadira A Hatim
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S80-S92
Publisher: Mosul University جامعة الموصل

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Abstract

The aims: The aims of this study were to evaluate the alveolar bone resorption every 2.5mm distal to the implant over denture to the retromolar pad in the mandibular arch, and to the maxillary tuberosity in the maxillary arch in edentulous patient according to number between two and four, and position of implants between canine and 2nd premolar. Materials and Methods: Eight patients (age range 45-60 years) were selected from the department of Prosthodontics/ College of Dentistry/Mosul University, who had at least one edentulous arch. All patients complaining from poorly retention conventional acrylic complete denture due to the residual ridge resoption, but the alveolar ridge height need at least 10mm implant length.After completing the surgical steps of 26 implants (two or four implant screw type titanium), over denture type with one step surgery for all implant types were constructed in conventional method after one month healing period. The prosthesis was delivered to the patients after one months of making the period elapsed. Dentures were delivered without socket attachment(six months). For assessment of alveolar bone height, for each patient panoramic exposure of OPG was recorded – three times [base line(at time of placement) , 6 months and 12 months]. Results: Results of this study showed, that mean difference of bone resoption range between [-0.2 –(-0.6)mm], and there was a significant difference of bone resoption between base line and 12 months to p0.05 according to number and position of implants. Conclusions: The conclusion of this study showed that, there was no significant different of alveolar ridge bone resoption between implants number in two or four implants over denture or implant position

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