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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
The effect of sialoprotein local injection on dental anchorages for orthodontic tooth retraction in dogs
تأثير الحقن الموضعي ل sialoprin على مراس الأسنان من أجل تراجع تقويم الأسنان في الكلاب

Authors: Fadhil Y. Jasim --- Rafah Al- Maroof --- Omar Fawzi Chawshli
Journal: Zanco Journal of Medical Sciences مجلة زانكو للعلوم الطبية ISSN: 19955588/19955596 Year: 2014 Volume: 18 Issue: 3 Pages: 773-780
Publisher: Hawler Medical Univeristy جامعة هولير الطبية

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Abstract

Background and objective: Bone sialoprotein is a mineralized tissue-specific protein expressed in differentiated osteoblasts that appear to function in the initial mineralization of bone. The aim of this study was to investigate the effect of local bone sialoprotein on increasing the rate of anchorage during orthodontic tooth movement.Methods: This study used 14 dogs wearing orthodontic appliance for 40 days. They were divided equally into two groups; experimental group that injected with 0.1 µg /10µL sialoprotein around the anchoring tooth in three different time intervals, while the other control group received normal saline injection. Different clinical measurements including loss of anchorage, space closure, rotation, tipping and extrusion were done on the stone casts of each dog before and after tooth retraction. Results: Clinical measurements revealed a highly significant difference between experimental and control group regarding loss of anchorage and space closure. The sialoprotein injected group showed less loss of anchorage than control group and the space closure was higher in experimental group than in the control group.Conclusion: This study showed that the local injection of sialoiprotein reduced movement of the anchoring tooth during orthodontic treatment and provided higher stability for the anchoring tooth.


Article
Histological Evaluation of Tissues Using a Bone Inducing Substance in Cases of Micro-Screw Implant "An Experimental In Vivo Study"

Authors: Tahani A Alsandook --- Mustafa M Al-Sultan --- Sabah A Ismail
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 24 Pages: 1-8
Publisher: Mosul University جامعة الموصل

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Abstract

To evaluate the effects of systemically administered Alendronate sodium on osteoclastic activity and osteoblast accumulation. Materials and Methods: Fourty eight micro-screw implant, twelve adult rabbits were used in this study, the rabbits divided into two main groups, treated and control group, which further subdivided into three subgroups according to the healing periods after 2 weeks, 4 weeks and 6 weeks. All animal were treated with alendronate sodium. Eight micro-screw implants instilled in tibiaes of each tested subgroup and six instilled in tibiaes of control subgroups, the tissue facing the micro-screw implant subjected to histological evaluation for the tested subgroups and control sub-groups including the number of active osteoblast and osteoclast. Results: A significant differences be-tween subgroups 0WT, 2WT and 4WT, were more prominent for 2WT and 4WT subgroups from 0WT subgroups which showed score (+++), further no significant difference for control subgroups were all showed score (+++) for osteoblastic activity. For the active osteoclast a significant differences detected between subgroups of experimental and control sample, were score (+) noticed in the 0WT subgroups, score (+) in 2 readings and (++) in 6 readings of4WT subgroups and score (+++) for 4WT subgroups with no significant difference between experimental and control samples in 2 weeks, 4 weeks and 6 weeks healing periods .Conclusions: According to the result of histological evaluation, no estimated differences in the bone remodeling process had been detected between treated and the control group, which may need longer period of drug administration to probably induce effect on bone.


Article
Surgical Difficulties of Cochlear Implantation in Children

Authors: Muhamed Dheia Ahmed --- Muthana Saleemabdalamer
Journal: Iraqi Academic Scientific Journal المجلة العراقية للاختصاصات الطبية ISSN: 16088360 Year: 2014 Volume: 13 Issue: 4 Pages: 493-498
Publisher: The Iraqi Borad for Medical Specialization المجلس العراقي للاختصاصات الطبية

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Abstract

ABSTRACT:BACKGROUND: Cochlear implantation is a recent surgical treatment of deaf children, surgical difficulties may arise and has impact on outcome of implant.OBJECTIVE:To define the difficulties encountered during surgery and how the surgeon deals with them.METHODS: 120 patients of bilateral severe to profound hearing loss who all had implantation in the department of otorhinolaryngology, medical city, during the period from July 2010 to September 2011. All of them received the Nucleus Freedom cochlear implant with Contour Advance Electrode, model CI24RE.They are classified into two groups according to difficulty arises during surgery :(group a ) those identified during access to cochlea.(group b) those associated with difficult electrode insertion.RESULTS: Difficulties encountered during access occurred in 8 patients (6, 66%); Difficulties encountered during insertion of electrode occurred in 16 patients (13.33%).CONCLUSION: We concluded that although cochlear implant (C.I.) surgery is now well practiced , and difficulties during surgery are infrequent, the Surgical management of certain obstacles encountered during surgery demands expert knowledge of surgical technique for successful implantation .


Article
The initial stability of dental implant with horizontal plate (An in vitro study)

Authors: Yaseen H. Motea ياسين حسن مطيع --- Basima M.A. Hussein
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 4 Pages: 95-101
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The Initial (primary) stability is one of the factors that play an important role in the success of the dentalimplants. The purpose of this study was to evaluate the initial stability of dental implant with horizontal plate by usingfive analytical tests: insertion torque, removal torque, resonance frequency analysis, push-in test and pull-out test.Materials and methods: Two different lengths of dental implants (5mm and 10mm) were tested in this study; eachdental implant was 4mm in diameter with a square threads shape of 1mm pitch and 0.5mm depth. The crestal areawas 4.2mm diameter contained a right angle margin circumferential ring while the apical area was tapered withtwo self-tapping grooves. In this study, the initial stability of dental implants’ design was compared with initial stabilityof dental implants of the same dimensions and design that engage horizontal plates of 1.5mm thickness at theapical part. All dental implants were implanted into a solid rigid polyurethane foam blocks (artificial bone) of0.48g/cm3 density and tested by the five initial stability tests. Each test was done with forty samples (twenty samplesof 5mm length and twenty samples of 10mm length).Results: The statistical analysis was performed and the result showed that there was very highly significant differencebetween dental implants with the horizontal plates and dental implants without the horizontal plates of both 5mmand 10 mm lengths in four initial stability tests which were insertion torque, removal torque, push-in test and pull-outtest. The statistical analysis of the resonance frequency analysis showed that there was non-significant differencebetween dental implants with the horizontal plates and dental implants without the horizontal plates of both lengths.Conclusion: These results implied that the dental implants with the horizontal plates had better primary stabilitycompared with the dental implants without the horizontal plates confirming that the horizontal plates enhanced theprimary stability of the dental implants


Article
Restoring implant bed alveolar defect with autologous bone graft taken from the patient’s chin: a case report for the surgical procedure

Authors: Dr. Wael Sheet Shallawi. B.D.S, F.I.B.M.S (M.F.) د. وائل شيت --- Dr. Rasha F. Albannaa. B.D.S., M.Sc. د. رشا لبنا
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2014 Volume: 11 Issue: 1 Pages: 106-110
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Alveolar bony defects represent one of the most common problems that face oralsurgeons who practice dental implant placement. This case report describes amodification of a recent technique that aims to restore a bony defect in the implantsite using a cylindrical bone block autograft taken from the patient’s own chin; then tomake both clinical and radiographic evaluation of the prognosis periodically over sixmonths postoperatively. The technique was found to be effective and successful as atreatment option to restore implant site bony defects.


Article
In vivo immunohistochemical investigation of the effect of the topical application of growth hormone on the osseointegration of cpTi implant

Authors: Abdul Naser H. Warwar --- Ban A. Ghani
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2014 Volume: 26 Issue: 2 Pages: 58-63
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Dental implants are a suitable option for the replacement of some or all missing teeth. The successfulinsertion of a biocompatible material into living tissue with little to no evidence of rejection has revolutionizedmedicine and dentistry. An increase in bone response was observed with local administration of growth hormonearound dental implants. Growth hormone may act as a bone stimulant in the placement of endosseous dentalimplants and enhances osseointegration. The aim of the study was to evaluate immunohistochemically the effect ofthe topical application of growth hormone on the osseointegration of cpTi implant.Materials and Methods: Eighty titanium screw implants were inserted in the tibia of the forty adult rabbits. Growthhormone was applied on experimental implants. Immunohistochemical tests were performed on the implants of bothcontrol and experimental groups for (3 days1, 2, and 6 weeks) healing intervals.Results: Titanium implants coated with growth hormone revealed an early bone formation, minerlization andmaturation in comparison to control. Immunohistochemical findings revealed positive expression for VEGF inexperimental implant in comparison to control one.Conclusion: Topical application of growth hormone may act as a bone stimulant in the placement of endosseousdental implants and enhances osseointegration

المقدمة: إن الغرسة السنیة ھي الطریقة المثلى لتعویضالأسنان المفقودة. إن الغرس الناجح للمواد المطابقة للجسم في داخل الأنسجة الحیة مع عدم حدوث رفضلھذه الم واد ق د اح دثثورة في الطب عامة وطب الأسنان خاصة وق د ل وحظ زی ادة ف ي اس تجابة العظ م عن د إض افة ھرم ون النم و ح ول الغرس ة الس نیة. إن ھرم ون النم و ربم ا یعم ل كمحف ز للعظ م ف ي عملی ةاستبدال الغرسان السنیة وك ذلك یحف ز تكام ل ال تعظم. الھ داف الدراس ة التقی یم النس یجي والنس یجي المن اعي الكیمی ائي لت أثیر الاس تخدام الموض عي لھرم ون النم و عل ى الان دماج العظم يباستخدام غرسة التیتانیوم.المواد والعمل: تم إدخال ثمانون غرسة من التیتانیوم في عظمة القصبة (الساق) لأربعین أرنب ناضج. تم إضافة ھرم ون النم و لغرس ات التجرب ة. اس تخدمت فحوص ات نس یجیة مناعی ةكیمیائیة اجریت لكافة الغرسات ولكلا المجموعتین التحكم والتجربة ، ولكل مراحل الالتئام ( 3 ایام ، 6 ، 2 ، 1 اسابیع).النتائج: غرسة التیتانیوم المغطاة بھرمون النمو أظھرت تم ام ون وج التك وین العظم ي ف ي مراح ل مبك رة مقارن ة بمجموع ة ال تحكم أعط ت النت ائج النس یجیة المناعی ة الكیمیائی ة إظھ ارافي غرسات التجربة بالمقارنة لغرسات التحكم. (VEGF) ایجابیا عالیا لھرمونات النمو وخصوصا لعامل النمو الوعائي البطانيالاستنتاج: ھذه الدراسة تخلصإلى الاستنتاج بان الاستخدام الموضعي لھرمون النمو یعمل كمحفز للعظم في عملیة غرسات الأسنان ویحفز عملیة تكامل التعظم

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