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Article
Evaluation of Immediate post-extraction implants of 34 patients in Basrah province.

Author: Dr. Riad G. Altaee F.I.C.M.S * د. رياض الطائي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2013 Volume: 10 Issue: 1 Pages: 98-105
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The aim of this study was to evaluate the success rate of the immediate postextractionimplants without incision or primary flap closure.Patients and Methods: The study included 34 patients in good general health,referred to the department of oral surgery in the specialized center of dentistry inBasra between August 2009 and July 2010, immediate post extraction implanttreatment 20(58.82 % ) female and 14(41.18%)male, aged 22 to 53 years withmean age 32.85 . Each patient had a tooth that required extraction, and each had atleast 4 mm of bone beyond the root apex. After tooth extraction, the implants wereimmediately placed without incision or flap elevation. Implant sites showing bonebone defects or bone fenestrations, were excluded from this study. The secondstagesurgical procedure was performed4 months after the first procedure. Thefollowing clinical parameters were evaluated at the time of implant placement andat second stage surgery: peri-implant radiolucency and marginal bone loss, whichwere evaluated radiographically.Results: The postsurgical healing period was uneventful for all patients. Soft tissueclosure over the implant sites was achieved in1to 3 weeks after surgery at all sites.At second stage surgery, no peri-implant bone defects were observed or detectedby probing. The soft tissue anatomy was considered clinically acceptable in allpatients.Conclusions: Immediate post-extraction implant treatment is an implant alternativewith a survival rate similar to that of the conventional technique for implantplacement and enables preserving both the bone structure and gingivalarchitecture.


Article
Estimating the Stability of Orthodontic Micro-implant after Applying Orthodontic Force "An Experimental in Vivo Study"

Author: Estimating the Stability of Orthodontic Micro-implant after Applying Orthodontic Force "An Experimental in Vivo Study"
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 25 Pages: 154-161
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate weather micro-screw implants remain stationary or move against orthodontic forces during different healing periods (immediate loading, loading after 2 weeks and 4 weeks). Materials and Methods: Thirty micro-screw implants were implanted in 6 rabbits. These rabbits divided into 3 groups (2 in each group). The first group received loading immediaty after implantation. The second and third groups received loading after 2 weeks and 4 weeks of healing period respectively. The stabil-ity of these implants was measured using periotest device before and after loading. The data was ana-lyzed using descriptive statistic, Analysis of variance (ANOVA), Duncan Multiple analysis range test and student t-test. Result: Among the three groups, the first group having a significant greater stability of micro-screw implants immediately before and after loading and after 2 weeks of loading period. Conclusion: micro-screw implants can be loaded immediately after implantation with light orthodontic force; also these implants can be loaded after 4 weeks of healing period.


Article
Evaluation The Accuracy Of Modified Closed Tray Impression Technique For Multiple Angled Implants Using Condensation-Silicone Impression Material

Authors: Osama A Hammoodi --- Lamia T Rejab --- Wael T Alwattar
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 27 Pages: 413-422
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: is to evaluate the linear distance accuracy of new modified closed tray impression technique of 6 angled implants and compared with open tray technique using condensation silicone impression material. Materials and Methods: : standard master model was prepared with six angled implants analogues (25 degree) buccaly and labial deviated .Two impression techniques were performed (open tray and new modified splinted closed tray) using condensation silicone impression material , then poured with die type IV stone. Capturing of the standard model and stone casts produced from both impression techniques. To perfume the measurement, first determine and label the reference points and reference line on standard model then measure the linear distances and angles with Matalab software program (7.12.0.635(R2011a). The entire measurements of the stone models were done by coordination way of implants analogues in sequence .Total number of impressions was ten, five impression for each technique. Statistically one sample t-test and two sample t-tests were performed to determine the significance differenc at p ≤ 0.05. Results: appeared there is no significance difference of the linear distances and angles of standard model and stone casts for open tray and a new modified closed splinted techniques. Conclusion: A new modified closed splinted technique is an accurate impression technique for multiple angled (6) implants as same as the open tray technique with condensation silicon, so a new technique is an accurate and easier technique to be carried out with multiple angled non- parallel implants.


Article
Comparison Study for the Quantity of Titanium Exist in Different Type of Dental Implant Alloy

Author: Jameel MA Sulaiman
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 27 Pages: 560-565
Publisher: Mosul University جامعة الموصل

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Abstract

The current study aims to compare alloys of dental implants and to find the ratio of titanium element (Ti) with different origins which are used by dentists in dental implant to restore the missing teeth. Materials and Methods: Three types of dental implants from Germany, Italy and Korea used in this study for statement the chemical structure of these alloys using (XRD: X-Ray Diffraction) (Model S1TurboSD LECE, BRUKER). Hardness, tensile strength, and flexibility coefficient tested by hardness measuring device Micro Hardness – AMSLER, Germany, 1978. The microstructure of samples obtained by Metrology Microscope (600X), ME-3125, UNION, 1978, Japan. Results: Different elements appeared in each alloy, and the titanium (Ti) ratio was the main one, where the Germany type (95.14%), Italy, (91.21%), while Korea type was the highest (95.21%). Tension Resistance in Germany model (755) N/(mm)2, Italian (781) N/(mm)2, and Germany (785) N/(mm)2. Hardness Vickers (HV) in Germany (277), Italy (285) and for Korean type (287). Modulus of elasticity, in Germany (107) Gpa, in Italy (115) Gpa. and in Korean (107) Gpa. The classification according to the American Society for Testing and Materials found in Germany Ti 3-2.5, Italy Ti6-2-1-1, and in Korean Ti 3-2.5. Conclusions: The Korean sample is best for three reasons the quantity of Titanium, Hardness Vickers (VH) and Tension Resistance are more. The Italy type is found better for Modulus Elasticity, while the Germany type is better in Microstructure. In general, and since, the three types have more than (90%) of Titanium there for all the types of dental implant are good against corrosion from acid and Hydrofluoric (HF).

Keywords

Dental Implant --- Titanium --- Alloy


Article
The Effect of Dental Implant Length and Di-ameter on the Stress Distribution at the Im-plant-Bone Interface of the Immediate Load-ing Implants: A 3/D Finite Element Analysis

Authors: Talal H Mohamad --- Umer Al-Adel
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 25 Pages: 44-51
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: to evaluate the effect of implant length and diameter on the values and distribution of stresses of immediate loading implants by using three-dimensional (3D) finite elements (FE) analysis. Materials and Method: A 3-D FE model of an implant embedded in a block of bone was used in this study. The implant was LEADER/ ITALIA-Fix type which is specially designed for immediate loading. ANSYS V.12 program was used to build solid model of the implant and bone, and performing the finite element analysis. Two lengths of implant were used (11mm. and 13mm)., and two diameters (3.75mm. and 4.25mm.). Results: The results showed that the areas of maximum stress of all lengths and diameters are located at the neck of implants, the increase in the implant length from 11mm. to 13mm. leading to slightly increase in the stress at the implant-bone interface, while the increase in the diameter from 3.75mm. to 4.25mm. having no significant effect in increasing the value of stresses around dental im-plants. Conclusions: The increase in the implant length is negatively affect on stress values, but it leads to better dissipation of stresses around dental implant. The increase in the diameter having no obvious effect on stress values. However, it reduce the area of maximum stress at the implant neck


Article
Satisfaction of Patient with Stud, Bar and Magnet Attachment Systems for Mandibular Two-Implant Over Dentures

Authors: Nadira A Hatim --- Ali M Al-Sheakh --- Salim H Saeed
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 27 Pages: 380-387
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: Evaluation patient satisfaction treated with new dentures using ball-socket, bar with and without cantilever, and magnetic attachments within two implant-supported mandibular overdentures (ISMOD) ) in relation to conventional denture (baseline) for 2-years by using questionnaire Al-Makki. Materials and methods: Twenty two edentulous patients were scheduled for evaluation of their oral function, two years they participated in this study. They received two mandibular implants and a new denture with different attachments {ball-socket, bar (Straight and curved) with or without cantilever, and magnetic types}. After 2 years of delivery of the overdentures, the oral situation was evaluated by using questionnaire. Non-parametric two-related sample analysis tests were used. Results: Patient satisfaction improved significantly between baseline and the new prosthesis with each attachment types for all domains of satisfaction (p≤0.05) for usual wearing of prosthesis. Conclusions: Patients satisfaction highly improved after implant retained denture treatment for the lower jaw. The type of attachment systems highly effect patients satisfaction about wearing of denture for social occasions and shape and size of the denture. But attachment type had no effect on patients satisfaction for masticatory functions.


Article
Bone density determination for the maxilla and the mandible in different age groups by using computerized tomography (Part I)

Authors: Sarah M. Tewfiq سارة توفيق --- Hadeel A. Al- Hashimi هديل علي الهاشمي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 1 Pages: 164-170
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Mini implant stability is primarily related to local bone density; no studies have evaluated bone densityrelated to mini implant placement for orthodontic anchorage between different age groups in the maxilla and themandible. The present research aims to evaluate side, gender, age, and regional differences in bone density of thealveolar bone at various orthodontic implant sites.Materials and method: Fifty three individuals who were divided into two groups according to their age into: group I(ages 16-20 years) and group II (ages 21-29 years) had subjected to clinical examination, then 64-multislicecomputed tomography scan data were evaluated and bone density was measured in Hounsfield unit at 102 points(51 in the maxilla and 51 in the mandible), and mean alveolar bone density was calculated at each site in the CTaxial plane.Results: No significant differences in bone density between the sides and gender were found. Generally, the bonedensity measurements of group I and II were not statistically different at almost most sites. The mean bone density ofthe alveolar cortical bone was greater in the mandible than in the maxilla and showed a progressive increase fromthe anterior to the posterior area, while in the maxilla the highest bone density was at the premolars region. Themaxillary tuberosity was the region with lowest bone density. Cancellous bone had almost comparable densitiesbetween the mandible and the maxilla and its density was less than those of cortical sites.Conclusion: When mini implants are indicated, no gender and side differences affect the success rate regardingbone density; while age and area should be considered when selecting and placing mini implants for orthodonticanchorage.


Article
Localization of transforming growth factor-beta expression in the peri-implant tissues of dental implants coated with placental collagen

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Abstract

Back ground : The transforming growth factor beta (TGFB) signaling pathway is involved in many cellular processes inboth the adult organism and the developing embryo including cell growth, cell differentiation, apoptosis. Theinteraction between implant material and surrounding tissues is believed to play a fundamental role in implantsuccess and illustrates different expression of growth factors by different cells that involved in the formation of periimplanttissue.The aim of this study was to localize expression of TGF B by newly formed bone tissue around surface-conditionedimplants with placental collagen at different time intervals: 3 ,7,14,28, and 56 days .Materials and Methods: Commercially pure Titanium (CPTi) implants coated with collagen protein were placed in thetibia of 20 new Zealand rabbits . Immunohistochemical study for localization of TGF B in peri –implant tissue for intervalperiods 3 ,7,14,28, and 56 days was performed under light microscope..Results: Positive expression of Transforming growth factor B can be detected in osteoblast, osteocyte, newlydeposited matrix includes collagenous tissue and non mineralized osteoid tissue. Endothelial cells line blood vesselshowed positivity too. Minerlized bone trabeculae and mature bone illustrate negative expression.Conclusion: The present study suggests that placental collagen, coated Ti implant illustrates positive expression oftransforming growth factor B by osteoblast and endothelial cell that enhanced bone formation


Article
Expression of matrix metalloproteinase-2 in the extracellular matrix of osseointegrated and diseased implants

Author: Ghada I. Al-Duboni
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 3 Pages: 176-182
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Recently with improvement of dental implantology science, osseointegrated implants show aconsiderable durability, however; failures are not completely avoidable. Matrix metalloproteinase-2 (MMP-2)expression is disturbed in many pathological conditions such as peri-implantitis and periodontitis. This study wascarried out to investigate the tissue expression of MMP-2 in the extracellular matrix of osseointegrated and diseasedimplants.Subjects and methods: Gingival biopsies were collected from six patients having osseointegrated or workingimplants and twenty with diseased or non osseointegrated implants and (6) controls having no implants. In situhybridization technique was used to analyze the changes in immunoreactivity of ECM-controlling MMP-2.Results: The findings of the present study indicate that the expression of MMP2 was significantly elevated in failedimplants versus healthy implants (P<0.01). In addition, MMP-2 was detected in peri-implant sites with ongoing boneloss, cavitations and inflammatory reaction.Conclusion: The in situ hybridization technique, showed clear evidence that MMP-2, which is involved in the processof osseointegration and bone remodeling, increase greatly in the presence of bone destruction, cavitations, severeinflammation and fibrous tissue formation. The data link titanium- induced bone remodeling to changes in expressionand distribution of MMP-2.


Article
Stability Evaluation of Micro-Screw Im-plant in Cases Given a Bone Inducing Substances "An Experimental in Vivo Study

Author: Mustafa M Al-Sultan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 25 Pages: 136-146
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The present study aimed to investigate the desirable loading time of micro-screw implant by stability evaluation and detecting the possibility of using alendronate sodium to increase the stability. Materials and methods: Forty eight micro-screw implant, twelve adult rabbits and fourteen alendro-nate sodium ampoules were used in this study, the rabbits were divided into two main groups, treated and control group, which further subdivided into three subgroups. Eight micro-screw implant instilled in tibiaes of each subgroup just six of them used for test the remaining cancelled, the stability test down using the periotest. These subgroups were nominated according to the loading times which are immedi-ate loading, loading after two weeks and loading after four weeks with stability measured after instilla-tion, before and after loading and two weeks after loading. Results: No significant differences between subgroups before loading and after two weeks of loading but significant after loading. For immediately loaded treated subgroup no significant differences between immediate loading and two weeks after loading. For two and four weeks treated subgroup a significant difference in stability between immedi-ate instillation and after loading. Conclusions: Micro-screw implant even smaller diameter could be used as a fixed anchorage in orthodontics and possibly could be loaded safely from time of immediate instillation, further the use of alendronate sodium add no benefit to increase stability according to the criteria used in this study.

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