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Article
Histological and histomorphometric analysis of strontium chloride coated commercially pure titanium implant compare with hydroxyapatite coating

Authors: Ghasak H. Jani --- Shatha S. Al-Ameer --- Salam N. Jawad
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 1 Pages: 26-31
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: In recent years, the immediate loading of dental implants has become more accepted as a standardprotocol for the treatment of the edentulous area. Success in implant dentistry depends on several parameters thatmay improve phenomenon of osseointegration and new bone formation in close contact with the implant. The aimof study was to evaluate the effect of strontium chloride coating of screw shape commercially pure titanium dentalimplant osseointegration at bone - implant interface by histomorphometric analysis and compare withhydroxyapatite coating at 2 time periods (2 weeks and 6 weeks).Materials and methods: Electrophoretic Deposition Technique (EPD) was used to obtain a uniform coating layer oncommercially pure titanium screws. The tibia of 4 white New Zealand rabbits was chosen as implantation sites. Eachtibia of rabbit received two screws, one strontium chloride coated and one hydroxyapatite coated and a total 30histological sections were obtained for each coating material in each period of time. Histomorphometric analysiswas performed to measure new bone formed ratio between implant and original bone, after 2 and 6 weeks healingperiods.Results: There was increased in new bone formation ratio for the strontium chloride coated implants thanhydroxyapatite coated implants and over the two periods of time. There was an increase in the new bone formationratio at bone-implant interface with time.Conclusion: Coating commercially pure titanium implant with strontium chloride was more efficient in increasingosseointegration at bone implant interface than hydroxyapatite , which was demonstrated by higher new boneformation and maturation at the two periods of time 2 weeks and 6 weeks after implantation


Article
Assessment of Calcium Carbonate Coating on Osseointegration of Commercially Pure Titanium Implant by Torque Removal Test and Histomorphometric Analysis

Authors: Mustafa S. Mahmood --- Shatha S. Al-Ameer
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 1 Pages: 32-38
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: One of the most important methods to replace lost teeth is dental implants. In order to increase the strength of connection of the implant with the jaw bone to provide early loading after placement, implant is coated by different coating materials that achieved that purpose. The aim of this study was to evaluate the influence of coating CP Ti implant with calcium carbonate on the strength of bone-implant interface after two and six weeks of implantation in rabbit femur bone by torque removal test, histological and histomorphometric analysis.Materials and methods: Coating the surface of commercially pure titanium screws with extra pure synthetic calcium carbonate via electrophoretic deposition method (EPD) was done. The surface of disc samples after coating was checked by optical microscopy, X-ray diffraction examination and measurement of coating thickness. Ten male white French rabbits were prepared for implantation. Forty screws were implanted in the femur bone, two implant screws in each femur bone. The first screw is coated with calcium carbonate and compared with the second uncoated screw. Rabbits are divided into two groups according to the healing periods 2 and 6 weeks. By torque removal, the osseointegration is measured. Single screw from each group was used for histological and Histomorphometric analysis.Results: There was significant increased mean torque removal for screws coated with calcium carbonate compared with uncoated screws. Histological examination showed an increase in the growth of bone cells for coated screws, and the histomorphometric analysis showed an increase in new bone formation percent (NBFP).Conclusion: Coating the surface of the CP Ti implant with calcium carbonate via electrophoretic deposition method had great effect in increasing the osseointegration than uncoated surface.


Article
Structural and Elemental Analysis of Plasma Nitrided Commercially Bure Titanium and Ti-6Al-7Nb alloy
التحاليل التركيبية والعناصرية للتيتانيوم النقي تجاريا" وسبيكة Ti-6Al-7Nb المنترده بالبلازما

Authors: Thair Latif Al-zubaydi --- Entisar Hatoo --- Shahlaa Jomaa
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 2 Part (B) Scientific Pages: 217-224
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Titanium and Ti – 6Al – 7Nb alloy biomaterials have become relatively popular for surgical implants. Plasma nitriding are commonly used for orthopaedic devices which are subjected to articulation and wear, to increase the surface hardness, and reduce the generation of wear debris. This paper aims to demonstrate the structural and elemental analysis of plasma nitrided titanium and titanium alloy. A Commercially pure titanium Cp Ti and Ti – 6Al – 7Nb alloy were surface modified using plasma nitriding in order to study its microstructural changes. DC glow discharge plasma nitriding was performed for different period of time (namely 5, 10, 15, 20, 25 and 30 hours). The glow discharge was occurred by applying 650 V between the two parallel electrodes under 3 mbar nitrogen gas pressures. To characterize the nature of the modified layers produced and to correlate with the corrosion behavior of these medical materials, Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) was employed on the modified surfaces. The effect of sputtering process that can occur during the nitriding process on the surface roughness was studied using Atomic Force Microscopy (AFM). The results shows that as the nitriding time processed the N+ concentration increases comparing to the metal and alloy matrix elements. Also the SEM micrographs shows two effected zones of the nitriding in the modified surfaces and the thickness of each zone depend on the nitriding time. The AFM results show that the nitriding process leads to reduce the surface roughness.

التيتانيوم وسبيكةTi-6Al-7Nbمن المواد الاحيائية شائعة الاستخدام لجراحة الغوارس .تعتبر النتردة بالبلازما من الوسائل التجبيرية شائعة الاستخدام لحل مشاكل الربط بالمفاصل , والبلى عن طريق زيادة صلادة السطح وتقليل تولد مخلفات البلى . يهدف البحث الى اظهار وبشكل واضح البنية التركيبية وتحليل العناصر للتيتانيوم النقي وسبيكته المنتردة بعد تعديل سطوحهما بالنتردة بالبلازما, تم تحوير سطح التيتانيوم النقي تجاريا وسبيكة Ti-6Al-7Nb باستخدام النتردة بالبلازما لغرض دراسة تغيراتهم التركيبية .استخدمت فترات زمنية مختلفة لبلازما التفريغ التوهجي هي(5 ,15,30,25,20 ساعة) على الترتيب. وتم التفريغ التوهجي تحت فولتية 650 فولت بين قطبين متوازيين وضغط 3 ملي بار لغاز النتروجين النقي. تم استخدام تقنية الفحص بالمجهر الالكتروني الماسح(SEM) وتقنية مطيافية الطاقات المتشتتةEDS) ) لوصف طبيعة سطح الطبقة المتولدة وعلاقتها بسلوك التاكل للمعادن الطبية . لقد استخدم مجهر القوى الذرية AFM)) لقياس وتحليل خشونة الطبقة المتولدة اثناء عملية النتردة وتاثير عملية الترذيذ التي تحدث ايضا اثناء النتردة. أظهرتالنتائج التي تم الحصول عليها الى زيادة تركيز النتروجين اثناء زيادة وقت النتردة مقارنة بالعنصر الاساس (التيتانيوم) والسبيكة قبل النتردة. اظهرت الصور المجهرية وجود منطقتان على السطح الاولى تسمى المتاثرة بالحرارة من جراء عملية النتردة وبسمك يعتمد على اختلاف زمن النتردة والثانية هي طبقة النتردة, كما ان قيمة خشونة السطح اخذت بالتناقص مع زيادة زمن النتردة من خلال الفحص بمجهر القوى الذرية.

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