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Astudy of the effect of Sagital malocclusion at Class I and Class II on Facial Asymmetry at the Frontal Plane for a Sample of Patients Using Computed Tomography (CT)

دراسة تأثير سوء الإطباق في الصنف الأول والثاني الهيكلي على اللاتناظر الوجهي في المستوى الجبهي لدى عينة مرضى باستخدام التصوير المقطعي المحوسب CT

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 Publication date 2018
  fields Dentistry
and research's language is العربية
 Created by Shamra Editor




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The asymmetric face is common so that increased interest in it .there are different ways to assess the asymmetry. Computed tomography is an accurate way that enable the examiner for reading the face at three planes ,and present three-dimensional information on the cranial mandibular Complex whereas (3D) analysis is essential for making a precise diagnosis of craniofacial morphology. Aim : This research aims to study the asymmetric at the facial patterns malocclusion (class I. Class II) using CT . the research sample consists of 48 CT image (male 23 and female 15)their ages ranged between 18 and 35 years old and did not receive any orthodontic treatment before, and devided into two groups according to the malocclusion ptterns(17 class II, 31 class I ) . Analysis was performed T. student test then calculated for all the data obtained . This study showed that a significant difference between the class I and class II malocclusion in each of the right and left.


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Research summary
تتناول الدراسة تأثير سوء الإطباق الهيكلي من الصنفين الأول والثاني على اللاتناظر الوجهي في المستوى الجبهي باستخدام تقنية التصوير المقطعي المحوسب ثلاثي الأبعاد (CT). شملت العينة 48 صورة مقطعية لـ 23 ذكراً و15 أنثى تتراوح أعمارهم بين 18 و35 سنة، ولم يخضعوا لأي معالجة تقويمية سابقة. تم تقسيم العينة إلى 17 صنفاً ثانياً و24 صنفاً أولاً. أظهرت النتائج وجود فروق ذات دلالة إحصائية بين الجانبين الأيمن والأيسر في كلا الصنفين، مع وجود فروق أكبر في الصنف الثاني. تم استخدام تحليل T ستيودينت لمقارنة الفروق بين الجانبين. تشير النتائج إلى أهمية التشخيص الدقيق لحالات سوء الإطباق الهيكلي لتحديد العلاج المناسب.
Critical review
تعتبر الدراسة خطوة مهمة في فهم العلاقة بين سوء الإطباق الهيكلي واللاتناظر الوجهي، إلا أنها تفتقر إلى توضيح بعض النقاط المهمة مثل تأثير العوامل البيئية والوراثية على النتائج. كما أن العينة المستخدمة قد تكون غير كافية لتعميم النتائج على جميع الفئات العمرية والعرقية. بالإضافة إلى ذلك، كان من الممكن أن تكون الدراسة أكثر شمولاً إذا تضمنت مقارنة مع تقنيات تصوير أخرى مثل التصوير السيفالومتري التقليدي.
Questions related to the research
  1. ما هو الهدف الرئيسي من الدراسة؟

    الهدف الرئيسي هو دراسة تأثير سوء الإطباق الهيكلي من الصنفين الأول والثاني على اللاتناظر الوجهي باستخدام تقنية التصوير المقطعي المحوسب ثلاثي الأبعاد (CT).

  2. ما هي الفئة العمرية للعينة المستخدمة في الدراسة؟

    تتراوح أعمار العينة بين 18 و35 سنة.

  3. ما هي التقنية المستخدمة في تحليل اللاتناظر الوجهي؟

    تم استخدام تقنية التصوير المقطعي المحوسب ثلاثي الأبعاد (CT) لتحليل اللاتناظر الوجهي.

  4. ما هي النتائج الرئيسية التي توصلت إليها الدراسة؟

    أظهرت النتائج وجود فروق ذات دلالة إحصائية بين الجانبين الأيمن والأيسر في كلا الصنفين، مع وجود فروق أكبر في الصنف الثاني.


References used
EDLER R, WERTHEIM D, GREENHILL D.Clinical andcomputerized assessment of mandibular asymmetry.EurJOrthod 2001; 23(5):485-94
PROFFIT W.R. Contemporary orthodontics.5Edition, 2007 Mosby
HARAGUCHI S, IGUCHI Y, TAKADA K. Asymmetry of the Face inOrthodontic Patients. Angle Orthod2008;78(3):421-426
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The asymmetric face is common so that increased interest in it . there are different ways to assess the asymmetry. Computed tomography is an accurate way that enable the examiner for reading the face at three planes ,and present three-dimensional information on the cranial mandibular Complex whereas (3D) analysis is essential for making a precise diagnosis of craniofacial morphology . Aim : This research aims to study the asymmetric at the facial patterns malocclusion (class I. Class III) using CT .
The aim of the study was to evaluate The relation between frontonasal complex and cases with class I, II, III Malooclousion. Material and methods: True lateral cephalometric radiograph of the sample that comprises 61 patienta of 34 females and 27 ma les aged 18-25 years.The data were analyzed using independent sample Student t-test, Anova analysis and Pearson correlation analysis. The results showed that significant differences between the value of front complsx and frontonasal angle and different malooclusion classes, but there were no significant differences between male and female according to frontal convex and frontonasal angle, However, the differences between classes according to frontal convex and frontonasal angle were found in females.
Class II malocclusion is a common clinical problem among white Caucasian population and its transverse component is a critical aspect of a functional and stable occlusion. The size and shape of the arches have considerable implications in orthodontic diagnosis and treatment planning, affecting the space available, dental esthetics, and stability of the dentition. Hence , it is important to study the alveolar arch width in this group of patients using the wide possibilities of cone beam computed tomography of evaluating real anatomy , true-to-scale images without distortions or superimpositions, and the selection of the desired sections.Objective:To evaluate the width of maxillary and mandibular alveolar arches in skelatal Class II adults compared to skeletal class I using cone beam computed tomography. Materials and methods: thirty-two subjects with skeletal Class II relationship and 10 subjects with skeletal Class I who were ordinary undergoing CBCT scan for non-orthodontics nor for otorihnolaryngology purpose were selected to measure the maxillary and mandibular alveolar width of first premolar and first molars.Independent samples’ t-test was calculated. Results:No statistically significant differences were found of alveolar widths between skeletal Class II and Class I subjects in both maxillary and mandibular widths of molar and premolar regions. Gender had no statistically significant effect in the results of the study. Conclusion :There is no differences in alveolar width between adults with skeletal Class II and Class I relationships, so the transverse discrepancy in skeletal Class II when exsists , it is more probably not originated from the alveolar base.
The purpose of this comparative study was to evaluate the correlation between two radiographic methods used to evaluate skeletal maturation, hand-wrist analysis method and cervical vertebrae analysis method. Within the limits of this study, the ce rvical vertebrae maturation method might mislead the clinician when treating adolescent skeletal Class II patients at the pubertal growth spurt since it is not correlated with hand wrist skeletal maturation method.
Dental anomalies are congenital defected teeth which have a certain prevalence in various malocclusions. the aim of this study was to determine the prevalence of different dental anomalies in Class I malocclusion patients seeking orthodontic treatment.

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