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Register a new userArticular eminence Inclination and its relationship with incisors mesiodistal inclination in skeletal class I occlusion adults with no clinical and radiographic symptoms of TMDs
ميلان المنحدر المفصلي وعلاقته مع الميلان الأنسي الوحشي للقواطع لدى بالغين ذوي إطباق صنف أول هيكلي بدون أعراض سريرية وشعاعية لإضطرابات المفصل الفكي الصدغي
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يشارك المنحدر المفصلي في التكوين الوظيفي للقيادة الخلفية لحركة الفك السفلي، إنه النقطة التشريحية حيث تستطيع الإجهادات الوظيفية أن تسبب تغيراً في حواف المنحدر المفصلي وبالتالي تغيراً في ميلانه أيضاً، ومن هنا تنبع أهمية التحقق من وجود علاقة بين ميلان المنحدر المفصلي من جهة وبين الميلان الأنسي الوحشي للقواطع العلوية والسفلية وذلك لتحقيق نتائج معالجة تقويمية أكثر استقراراً. هدف البحث: دراسة العلاقة بين ميلان المنحدر المفصلي من جهة وبين الميلان الأنسي الوحشي للقواطع العلوية والسفلية وذلك لدى بالغين ذوي إطباق صنف أول هيكلي وبدون أعراض سريرية ولا شعاعية لإضطرابات المفصل الفكي الصدغي. مواد وطرق البحث: من خلال الإستعانة بفحص الشعاعي وفحص سريري متعدد المراحل تم انتقاء 46 مريض من العرق قوقازي ممن لم يخضعوا لمعالجة تقويمية سابقة (19 ذكر و27 أنثى) تراوحت أعمارهم بين 16 و 27 سنة ذوي إطباق صنف أول هيكلي وبدون أعراض سريرية وشعاعية لإضطرابات المفصل الفكي الصدغي، حيث تم إجراء تقييم شعاعي سيفالومتري لميلان المنحدر المفصلي وللميلان الأنسي الوحشي لمحاور القواطع حيث تم لاحقاً إجراء تحليل معامل ارتباط بيرسون ما بين ميلان المنحدر المفصلي والميلان الأنسي الوحشي لمحاور القواطع. النتائج: لم نجد إرتباطاً ذو دلالة إحصائية ما بين ميلان المنحدر المفصلي وبين الميلان الأنسي الوحشي لمحاور القواطع. الخلاصة: لا يوجد إرتباط ما بين ميلان المنحدر المفصلي وبين الميلان الأنسي الوحشي لمحاور القواطع العلوية والسفلية لدى البالغين ذوي إطباق صنف أول هيكلي ليس لديهم أعراض سريرية وشعاعية لإضطرابات المفصل الفكي الصدغي.
Articular eminence participates in the functional formation of the posterior guidance of the mandibular movement, it's the anatomical point where functional stresses can result in alteration of the contours of the articular eminence, and its inclination respectively, Hence, orthodontists need to know the relationship between the articular eminence Inclination and the mesiodistal inclination of upper and lower incisors to achieve more stable results of orthodontics treatment. Aim The aim of this research is to investigate the relationship of upper and lower incisors mesiodistal inclination with the inclination of the articular eminence in class I skeletal occlusion in adult subjects with no clinical nor radiographic symptoms of TMDs. Materials and methods: In result of radiographic study and a multistage clinical examination protocol, 46 Caucasian patients with no prior orthodontics treatment were selected (19 males, 27 females) from 16 to 27 years of age with skeletal class I occlusion and no clinical or radiographic signs and symptoms of TMDs. Furthermore, cephalometric evaluating of the Inclination of the articular eminence and the mesiodistal inclination of the incisors was performed; Pearson's Correlation Coefficient was calculated to investigate the relationship of articular eminence Inclination with the mesiodistal inclination of the incisors. Results: no significant relationship between incisors mesiodistal inclination and the articular eminence inclination was found. Conclusions the steepness of the articular eminence appears not to vary with mesiodistal inclination of the incisors in skeletal class I occlusion adults with no clinical and radiographic symptoms of TMDs
References used
HYLANDER W.L. Incisal bite force direction in humans and the functional significance of mammalian mandibular translation. Am J Phys Anthropol. 1978 Jan;48(1):1-7
KOHNO S, NAKANO M. The measurement and development of anterior guidance. J Prosthet Dent. 1987 May;57(5):620-5
ANGEL J.L. Factors in temporomandibular joint form. Am J Anat. 1948 Sep;83(2):223-46
MOFFETT B.C. Jr, JOHNSON L.C., MCCABE J.B., ASKEW H.C. Articular remodeling in the adult human temporomandibular joint. Am J Anat. 1964 Jul;115:119-41
ICHIKAWA J, HARA T, TAMATSU Y, IDE Y. Morphological changes in the internal structure of the articular eminence of the temporal bone during growth from deciduous to early mixed dentition. J Biomech. 2007;40(16):3541-7
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Maxillary stenosis is a common skeletal disorder. There are many surgical techniques used to treat maxillary stenosis in adults. One of these techniques is the surgically assisted maxillary expansion technique, around which studies differed in terms of surgical technique and the resulting structural and alveolar effects.
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including the TMJ disc, seem to be associated with altered characteristics of the
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during the process of the facial growth is not clear yet.
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Every osteotomy and every surgical correction of dentofacial deformity has
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aimed evaluate the effect on the TMJ after the orthognathic surgery
(bimaxillary osteotomy).Furthermo
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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.
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