العلم العراقي
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سمك العظم الشدقي في مناطق مختلفة من الفك السفلي واهميتة السريرية في تثبيت المسامير الحلزونية احادية القشرة باستخدام جهاز الاشعة المقطعية متعدد الشرائح == Thickness of Buccal Bone At Various Sites of Themandible And Its Clinical Significance In Monocortical Screws Placementusing Multislice Computed Tomography

اسم المؤلف: حوراء نوري عطا لله
اسم المشرف: لمياء حامد النقيب
الموضوع العام: طب الاسنان
السنة: 2014
الموضوع الدقيق: اشعة الفم والاسنان
الدرجة: ماجستير
الجامعة: جامعة بغداد
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Open reduction and internal fixation (ORIF) using miniplates and screws is the treatment of choice for mandibular fractures.Using miniplates and screws along the ideal line of osteosynthesis provides sufficient support and stability to the bone fragments to allow immediate function. It is important to know both : the region where the bone providesafirm anchorage for the screw,andthe topography of thedental apices and inferior alveolar nerve to avoiddamaging them when inserting the screwThe aim of study : The purpose of this study is to determine the thickness of buccal cortical plate and that of buccal bone using computed tomography,at the parasymphysis and mandibular body, thereby determining the area that provide afirm anchorage and the maximum length of mono - cortical screws that can be safely placed in these regions without injuring the tooth roots orinferior alveolar nerve.Materials and Methods : The sample of the present study was a total of 110 Iraqi patients (77 males & 33 females) aged (18 - 35) years old who admitted to Computed Tomography scan unit in AL - SadrTeaching Hospital in Al - Najaf city to getComputed Tomographic examination of facial bones from November 2013 to May 2014. The conventional section of CT (axial) wasused to do the measurements and dental planning analysiswhich is a specific investigation protocol was also used.The thickness of buccal cortical plate and the thickness of buccal bone were measured at the level of root apex of (canine, first premolar, second premolar) and at the level of : root apex and inferior alveolar canal in (mesial and distal root of first and second molar). Results : The mean buccal bone thickness at canine area was (3.7 - 4.3 mm), in premolars area (3.6 - 4 mm), in molar area (at the level of apex) (5.6 - 6 mm), in molar area (at the level of inferior alveolar canal) (5.2 - 5.6 mm) for females and males respectively. The mean buccal cortical plate thickness at canine area was (1.4 - 1.6 mm), in premolars area (1.5 - 1.7 mm), in molar area (at the level of apex) (2.4 - 2.6 mm), in molar area (atthe level of inferior alveolar canal) (2.4 - 2.3 mm) for females and males respectively.There was no statistically significant age and gender difference in buccal cortical plate thickness and buccal bone thickness. Conclusion : Buccal cortical plate thickness and buccal bone thickness in various sites of the mandible could be measured precisely using Multislice Computed Tomography which can guide surgeons in selecting the proper screw length without causing injury to rootapex or inferior alveolar nerve.

تاثير الجنس،العمر وفقدان السن على ابعاد القناة الثاقبة والعظم الامامي للقناة : دراسة بالتصوير المقطعي == Effect of Gender, Age And Tooth Loss On The Dimensions of Incisive Canal, And Buccal Bone Anterior To The Canal (Computed Tomography Study)

اسم المؤلف: رياحين غازي رشيد
اسم المشرف: احلام احمد فتاح
الموضوع العام: طب الاسنان
السنة: 2014
الموضوع الدقيق: اشعة الفم والاسنان
الدرجة: ماجستير
الجامعة: جامعة بغداد
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: القناة الثاقبة تركيب تشريحي لھا موقعا ھاما في الفك العلوي الامامي، دراسة خصائص ھذه القناة وتقييم علاقتھا مع العظم الامامي للقناة ضروري خلال زرع القواطع المركزية العلوية. الاشعة المقطعية لھذه المنطقة يمكن ان توفر ميزات دقيقة عن حدود وموقع القناة الثاقبة | The incisive canal is an anatomical structure with an important location in the anterior maxilla, analyzing this canal characteristics and evaluated its relation to the bone anterior to the canal is necessary during dental implantation of maxillary central incisors. CT scan image for this region can provide accurate features about the border, position of incisive canal and status of buccal bone anterior to this canal.Aim of the study : To study for the effect of gender, age and tooth loss in area of maxillary central incisors teeth on the dimensions of the incisive canal and buccal bone anterior to the canal using spiral computed tomography.Subjects, Materials and Methods : The sample consisted of prospective study for 156 subjects of both gender. The sample were divided into two groups, 120 dentate group (60 male and 60 female) with age ranging from (20 - 70) and 36 edentate group(with missing both maxillary central incisor) (18 male and 18 female) with age ranging from (50 - 70), which was further divided into two group according to the duration of maxillary central incisorsteeth loss, long duration (5+) years which consists of 26 subjects and short duration (<5 years) which consists of 10 subjects. All subjects attended to Baquba Teaching General Hospital in Diyala for Computed Tomographic scan investigation for different Maxillofacial diagnostic purposes from November/2013 to April/2014.Using sagittal section of computed tomography scan, the following measurementswere done : A - The diameters of incisive canal were measured at crestal, middle and apical level and the total mean value of canal diameters was calculated. B - The length of incisive canal.C - The distance of buccal bone anterior to incisive canal at crestal, middle and apical level and the total mean value of buccal bone distances was calculated. D - The length of buccal bone anterior to incisive canal from the apical measurement of buccal bone to the alveolar crest. The measuring unit was in millimeter in all measurements.Result : Gender had moderately strong effect on the dimensions of incisive canal and buccal bone anterior to this canal, the mean values begin generally higher for male as compared to female for both control and cases group. Absence of maxillary central incisors decreased incisive canal length and buccal bone dimensions with mean values begin higher in control group than that in cases group, the effect of teeth loss on these selected measurements seem to be strong ;however, canal diameter remain unchanged with dental status and there was no effect of teeth loss on this parameter.There was a moderately strong to strong effect of the duration of maxillary central incisors teeth loss on canal length and buccal bone dimensions with mean values being significantly lower in long duration (5+) years than that in short duration (<5 years) while it had weak effect on incisive canal diameter for both gender. The results showed that there was no significant linear correlation between age and all selected measurements in male and female for both control and cases group. Conclusion : CT scan is a valuable tool to evaluate the anatomic variation at the examined area in the current study, gender and dental status are important factors that can affect incisive canal characteristics and amount of bone anterior to the canal. Clinicians should perform careful planning using CT scans before performing dental implant surgeries in premaxillary region.