مقایسه‌ی طرح‌های All on four ،All on five و All on six ماگزیلا: مطالعه‌ی آنالیز اجزای محدود

نوع مقاله : مقاله‌های پژوهشی

چکیده

مقدمه: هدف از این مطالعه المان محدود، مقایسه طرح All on four ماگزیلا با طرح All on five  و All on six از نظر نحوه توزیع حداکثر استرس در استخوان کورتیکال و استخوان ترابکولار و اجزای مختلف طرح پروتز شامل سوپراستراکچر، ایمپلنت ها، اباتمنت ها و پیچ های اباتمنت بود.
مواد و روش ها: در این مطالعه‌ی آنالیز المان محدود، مدل ماگزیلای بی دندان و سه طرح متکی بر ایمپلنت جهت بازسازی بی دندانی کامل به روش پروتز ثابت ساخته  شد. طرح ۱: طرح All on four : چهار ایمپلنت شامل دو ایمپلنت قدامی عمودی در موقعیت دندانهای لترال و دو ایمپلنت خلفی با زاویه 30 درجه در موقعیت پرمولرهای دوم . طرح2: طرح :All on five پنج ایمپلنت شامل یک ایمپلنت عمودی در موقعیت دندان سانترال ، دو ایمپلنت عمودی در موقعیت دندانهای لترال و دو ایمپلنت خلفی با زاویه 30 درجه در موقعیت پرمولرهای دوم. طرح 3:طرح All on six : شش ایمپلنت شامل دو ایمپلنت عمودی در موقعیت دندان های سانترال، دو ایمپلنت عمودی در موقعیت دندان های کانین و دو ایمپلنت عمودی کوتاه در موقعیت مولرهای اول شرایط لودینگ بدین صورت بود: نیروی 100نیوتون آگزیال (عمودی) به انتهای سوپراستراکچر سمت چپ ماگزیلا وارد شد.
یافته ها: تحت نیروی وارده کمترین میزان تنش در استخوان و ساختارهای پروتزی مربوط به  مدل شماره 3(طرح All on six) و بیشترین میزان استرس در استخوان و ساختارهای پروتزی مربوط به مدل شماره 1 (طرح All on four ) بود.
نتیجه گیری: طرح All on six با ایمپلنت های کوتاه خلفی بهترین رفتار بیومکانیک را داشت. طرح All on four  بیشترین حد تنش در استخوان و ساختارهای پروتزی را داشت و از نظر حداکثر توزیع استرس طرح All on five شرایط مابین دو مدل دیگر داشت.

عنوان مقاله [English]

Compariosion of Maxillary All-on-four, All-on-five and All-on-six: Finite Element Analysis

چکیده [English]

Introduction: The study's purpose was to compare the maxillary All-on-four, All-on-five, and All-on-six designs in terms of stress distribution in the bone and various components of the prosthesis design.
Materials and Methods: This finite element analysis study was carried out descriptively in 2024 at the Faculty of Dentistry in Isfahan. An edentulous maxillary model and three implant-based fixed prostheses were designed. Design 1 (All on four): two vertical anterior implants in the position of the lateral teeth and two posterior implants with an angle of 30 degrees in the position of the second premolars. Design 2( All on five): one vertical implant in the position of the central tooth, two vertical implants in the position of the lateral teeth, and two posterior implants with an angle of 30 degrees in the position of the second premolars. Design 3 (All on six): two vertical implants in the position of the central teeth, two vertical implants in the position of the canine teeth, and two short vertical implants in the position of the first molars.
A force of 100 Newtons was applied to the left end of the superstructure, and then the maximum stress in the bone and corresponding prosthetic structures were compared.
Findings: The All-on-Six design caused the least stress in the bone and prosthetic structures, and the All-on-Four design caused the most stress.
Conclusion: Among the designs evaluated, the All-on-six demonstrated the most favorable biomechanical performance. The All-on-four design exhibited the highest stress levels within bone and prosthetic components. While the All-on-five design presented intermediate stress levels compared to the other two models.
Keywords: Dental implant; Maxilla; All on four; Support; Finite element analysis

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