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The Effect of Insertion Angle on Primary Stability of Orthodontic Mini-implants "An Experimental in vivo Study"

Author: Saba H Al–Zubaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 26 Pages: 327-332
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To determine whether obliquely inserted mini-implants can be loaded immediately with light orthodontic force? And which mini-implants are more stable those with 90 degree or 60 degree insertion angles? Materials and Methods: three rabbits were used in this study. Sixteen mini-implants divided into 2 groups equally. The first group implanted in the rabbit’s tibia bone at 90 degree insertion angle and the second group implanted in the rabbit’s tibia bone at 60 degree insertion angle. The stability of mini-implants was measured using periotest device immediately before and after loading and after 2 weeks of loading period. The data were analyzed using descriptive statistic, Analysis of variance (ANOVA), Duncan Multiple analysis range test and student t-test. Result: mini-implants at 60 degree insertion angle can be loaded immediately with light orthodontic force. Also, those miniimplants having a significant greater stability before loading and after two weeks of loading period in comparison with mini-implants implanted at 90 degree angle. Conclusions: In clinical practice, miniimplants inclined to the bone surface at 60degree tend to have better primary stability and can be loaded immediately.


Article
Histomorphometric analysis of bone deposition at Ti implant surface dip-coated with hydroxyapatite (In vivo study)

Authors: Athraa Y. Al-Hijazi عذراء الحجازي --- Thair L. Al-Zubaydi ثائر الزيدي --- Eman I. Mahdi ايمان مهدي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 2 Pages: 70-75
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Synthetic hydroxyapatite,(Ca10(PO4)6(OH2) can directly bond to bones without infection and fibrousencapsulation, thus is regarded as bioactive and biocompatible. The aim of the study was the estimation ofmicroarchitecture bone parameters include bone mass (gm/cm2) cortical bone width (mm), thread width (mm),marrow space star volume analysis (V*m) and osteoblast, osteocyte cell number.Materials and methods: Ninety-six (96) commercially pure titanium CpTi) used in this study, (48) implants were coatedwith HA by dipping coating and (48) implants were used as control. They were inserted in (32) Newzland white rabbitsand followed for 2 & 6 weeks. Mechanical torque removal test and histomorphometric analysis of bonemicroarchiteture were performed for evaluation of osseointegration.Results: Results revealed, Torque values were increased with advancing time for coated and uncoated groups. Andspecifically dip coated implant showed high value in comparison to control. Histomorphometric analysis for boneparameters showed highly significant difference in overall contrasted groups of implant in 2nd and 6th week interval.Conclusion: Dip coating method is an alternative coating technique for dental implant to enhance better boneimplant contact and improve osseointegration


Article
Salvage of Extruded Cochlear Implant By Interposing Pericranial Flap

Authors: Ahmed Khalaf Jasim --- Tawfeeq Waleed Tawfeeq --- Hamed Mahmood Mohammed Alnakeeb
Journal: Iraqi Academic Scientific Journal المجلة العراقية للاختصاصات الطبية ISSN: 16088360 Year: 2013 Volume: 12 Issue: supplement Pages: 727-731
Publisher: The Iraqi Borad for Medical Specialization المجلس العراقي للاختصاصات الطبية

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Abstract

ABSTRACT:BACKGROUND: Cochlear implant has become a routine procedure for management of severe sensorineural hearing loss. Cochlear implant extrusion is one of the most devastating complication of this procedure. A double layer closure of pericranial flap and scalp rotational flap has being showed to decrease the rate of late implant extrusion.OBJECTIVE:The purpose of this study is to evaluate the use of the pericranial flap as second layer coverage after cochlear implant extrusion.PATIENTS AND METHODS:Eight patients with cochlear implant extrusion in Al-Shaheed Gazi Al-Hariri hospital were operated on by using two layer closure ; the pericranial flap as salvage layer used to cover the cochlear implant and scalp rotational flap as a routine coverage, with mean postoperative follow- up period of 6 months.RESULTS: Eight patients with late cochlear implant extrusion where operated on by using double layers closure, seven of them had no evidence of extrusion during the 6 months follow-up period. No complications were notice apart from one case who developed flap necrosis and the implant was removed later on, and another patient who had postoperative hematoma, which was surgically evacuated and the flap healed uneventfully. The results show that using pericranila flap as salvage second layer coverage in patients with cochlear implant extrusion had significant role in prevention of secondary cochlear implant extrusion. CONCLUSION: We concluded that the use of combination of pericranial flap as first layer with scalp rotational flap as secondary coverage of implant had superior result in prevention of secondary cochlear implant extrusion.

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