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Article
Immediate Implant Placement in Fresh Extraction Socket

Authors: Mohammed Majid Abdulmunem محمد مجيد عبد المنعم --- Jamal Abid Mohammed جمال عبد محمد
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 103-110
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: In the traditional protocol, the patient should wait after extraction up to six months to place the dental implant in healed bone, this waiting time accompanied by varying degrees of alveolar bone changes. In order to overcome these problems, immediate implant placement in the fresh extraction socket was introduced. The Aim of this study was to evaluate the outcome of the immediate implant placement utilizing Resonance Frequency Analysis (RFA) to quantify implant stability and osseointegration.Materials and Methods: A total of (23) patients participated in the study, receiving (44) implants placed in the sockets of teeth indicated for extraction. Clinical and radiographic preoperative assessment was accomplished for each patient, β-TCP (combined with collagen membrane) was used to fill gaps ≥ (2 mm) and to repair bone defects. Implant stability quotient (ISQ) values were measured for the implants at baseline and at 16 weeks. Postoperative clinical and radiographic evaluation was applied for each patient.Results: A total of (22) patients received (41) implants completed the follow-up period, all these implants survived (100% survival rate) with no signs and symptoms of failure. The mean of ISQ value at baseline was (65.32±9.50), the mean of ISQ value at 16 weeks was (69.78±7.15), paired samples statistic showed high significant increase in the implant stability (P<0.01). Application of guided bone regeneration (GBR) showed no significant difference on ISQ value at baseline and at (16 weeks), but ISQ values increased significantly in GBR cases during the healing period.Conclusions: Immediate implant placement is a predictable treatment approach; it has the benefit of reducing treatment time and the numbers of surgical procedures when careful preoperative examination and appropriate intraoperative protocol is applied.


Article
Evaluation of Osseointegration of Dental Implants Prepared by Piezosurgery (Clinical Study)

Authors: Younus Jabbar Jiheel يونس جبار جحيل --- Jamal Abid mohammed جمال عبد محمد
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 1 Pages: 96-103
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Piezosurgery device is a system developed recently to overcome the limitation of the traditional surgical technique in implant site preparation, which use the principle of ultrasonic microvibrations to create precise & selective cut in bone in harmony with the surrounding tissues. The aim of this study was to evaluate the outcomes of implants inserted by ultrasonic implant site preparation protocol (UISP) using piezosurgery device, regarding the survival rate, stability and other related factors, at 16 weeks postoperative follow up period.Materials and Methods: A total of (24) patients, (6) males and (18) females, aged between (19-51) years old, contributed in this study receiving a total of (42) implants, all of these implants bed were prepared by means of special tips mounted in piezosurgery device. For each patient thorough clinical and radiographical preoperative assessment was applied. Implant stability quotient (ISQ) values were measured at baseline, 8 weeks and at 16 weeks. Postoperative clinical and radiographic evaluation was applied for each patient for 16 weeks postoperatively.Results: (24) patients received (42) implants accomplished the follow-up period, After 16 weeks all implants (42) were osseointegrated and the overall implants survival rate was 100% with no failure and no complication was observed. The mean ISQ value at baseline was (74.32±6.42), the mean ISQ value at 8 weeks was (72.62±9.05) and at 16 weeks the mean ISQ (±SD) value was (76.68±7.35) the changes in the mean stability during the healing period showed significant increase in the implant stability (P≤0.05). At the 16th week the number of implants that achieved ISQ≥70 was 35 (83.3%), and 7 implants attained ISQ> 70 (16.7%).Conclusions: high and significant survival rate, significant secondary stability, early positive shifting of the mean ISQ value, no remarkable complications in implants inserted by ultrasonic implant site preparation indicated that piezosurgery is a reliable alternative and safe method used in dental implant osteotomy


Article
Determination of Implant Primary Stability: A Comparison of the Surgeon’s Tactile Sense and Objective Measurements

Authors: Bakir Ghanim Murrad بكر غانم مراد --- Jamal Abid Mohammed جمال عبد محمد
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 4 Pages: 65-71
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Evaluation and measurement of primary stability could be achieved by several methods, including the resonance frequency analysis (RFA) and implant insertion torque (IT) values. The need for a sufficient primary stability, guaranteed by an adequate insertion torque and implant stability quotient values, increased its importance mainly in one stage implants or in immediate loading protocols. The aims of this study was to find if there is a correlation between the peak insertion torque (PIT) and ISQ values of implants inserted in the jaws of different bone quality which regarded as two important clinical determinant factors for prediction of implant primary stability, and to evaluate and compare whether an experienced clinician could precisely predict the primary stability of an implant on insertion with different surgical procedures using his own tactile perception.Materials and methods: A total of (60) Iraqi adult patients, (28) males and (32) females, age ranged (22-66) years old were enrolled in this clinical prospective study. The maximum torque value recorded on implant insertion using calibrated manual torque ratchet adopting three categories: low (10 to 30 N/cm), medium (30 to 50 N/cm), and high insertion torque (50 to 70 N/cm). The oral surgeon was asked to indicate the perceived ISQs values according to his perception then Implant stability quotient were measured by Osstell ™. Bone density (type) was determined according to subjective bone resistance encountered while drilling as proposed by Lekohlm and Zarb.Results: A total of 160 implants were inserted. The mean peak IT value was 49 ± 2.61N/cm. The mean ISQ value was 71.7 ± 8.86. Statistical analysis show a significant correlation between ISQ values and PIT values (P<0.001) , between IT values and bone types and between perceived primary stability and actual primary stability (P<0.001) .Conclusions:The corresponding significant correlations between insertion torque, and ISQ values may help clinicians to predict primary stability on implant insertion, that may be associated with implant survival and success rates. A moderate reliability (correlation) between perceived ISQ values and those measured using RF analyzer(Ossttel device).


Article
The electronic configuration of Fe-Ni alloy's system by Compton profile probe
الترتيب الالكتروني لسبيكة (Fe-Ni) بواسطة شكل منحنى كومبتون كمجس

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Abstract

The calculated values of Compton profile of Fe,Ni metals and their two alloys namely Fe0.5-Ni0.5 and Fe0.64-Ni0.36 are reported. The Renormalized Free Atom(RFA) model are used to determine the most favored electron configurations for the two metals which are found to be Fe(3d6.7-4s1.3) and Ni(3d8.8-4s1.2) respectively ,the values for FREE ELECTRON(FE) model and FREE ATOM(FA) were calculated for the same also. The Super Position model were used to find the Compton profile values for the two alloys .All theoretical values for the two metals as well as their alloys are compared with the recent available experimental and theoretical values and they show a good agreement.

قيم شكل منحنى كومبتون لمعدني الحديد والنيكل وسبائكهما تم حسابهم باستخدام نماذج مختلفة هي نموذج اعادة معايرة الذرة الحرة ونموذج الالكترون الحر وقيم الذرة الحرة للمعدنين, والذي تم ايجاد افضل ترتيب الكتروني لكل منهما. لقد استخدم نموذج التركيب الاعظم لايجاد قيم شكل منحنى كومبتون للسبيكتين Fe0.5-Ni0.5 و Fe0.64-Ni0.36. جميع القيم المحسوبة تمت مقارنتها مع احدث ما متوفر من قيم تجريبية حيث وجدنا تطابق كبير بينها, تم ايضا دراسة احتمالية انتقال الشحنة بين مكونات السبيكتين من المعدنين.


Article
Investigation of electronic structure for β-Zr in the(s-d) subshell
دراسة التركيب الالكتروني للغلافين (s-d) لعنصر الزركونيوم ذي طور بيتا

Author: Abdulhadi Mirdan Ghaleb عبد الهادي مردان غالب
Journal: Tikrit Journal of Pure Science مجلة تكريت للعلوم الصرفة ISSN: 18131662 Year: 2016 Volume: 21 Issue: 6 Pages: 126-131
Publisher: Tikrit University جامعة تكريت

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Abstract

In this paper, a theoretical study of calculating Compton profiles(CPs) for β-Zr using the renormalized-free-atom model and free electron model for different configurations (4d3-x-5s1+x),where (x= 0.1 to 1 step 0.1) is presented .The theoretical results and previously experimental data show good agreement and the best electronic configuration found was (4d2.8-5s1.2 ). The cohesive energy of β-Zr is computed by using theoretical Compton profile data and compared with available data. The band structure and density of state of (β-Zr and α-Zr) phases are determined from density functional theory (DFT) with use Quantum wise Atomistix Tool Kit (ATK),Virtual Nano Lab calculations within the framework of the local density approximation (LDA).

البحث يتضمن حساب منحني كومبتن لطور بيتا لعنصر الزركونيوم باستخدام النموذجين (اعادة المعايرة الحرة والكترون الحر) لمختلف الترتيبات الكترونية (4d3-x-5s1+x) حيث ان (x=0 to 1 step 0.1), تم حصول على توافق جيد بين البيانات النظرية والعملية المأخوذة من احدى المصادر المشار اليه في متن البحث ,وان افضل ترتيب الكتروني وجد عند (4d2.85s1.2).وكذلك حسبت طاقة التماسك من النتائج النظرية وقورنت مع البيانات السابقة. اوجد التركيب الحزمي وكثافة الحالات لطورين (بيتا والفا) لعنصر الزركونيوم ضمن نظرية الدالي للكثافات باستعمال شفرة (Quantum wise-ATK) وباستخدام طريقة تقريب كثافة الموضع.

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