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A laboratory Study to compare modified replica technique and replica technique used to measure the marginal fit of zirconium posterior bridges CAD\CAM

دراسة مخبرية لمقارنة تقنيّتي النسخ المضاعف و النسخ المضاعف المطورة المستخدمة لقياس الإنطباق الحفافيّ للجسور الزيركونيّة الخلفية CAD\CAM

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 Publication date 2014
  fields Dentistry
and research's language is العربية
 Created by Shamra Editor




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Replica technique remain most commonly used technique for measuring the marginal fit in the medical literature, the silicone rubber addition is considered most accurate and least changing dimensions. Aim of study to compare the accuracy and simplicity of traditional replica technique and modified replica technique to measure marginal fit of zirconium posterior bridges manufactured by CAD\CAM. After removal of first lower molar from TYPODENT (Frasco, Tettnang, Germany), the second lower molar and premolar neighboring were prepared commensurate with full ceramic restoration. Final impression of this bridge was taken by silicone rubber addition (Zhermack Elite HD+) with the aid of custom tray. The impression was condensed with amalgam to make the main metal cast. Fifteen custom acrylic resin trays were used for fabricate fifteen impressions of main metal cast that were used for fabricate 15 zirconium bridges by CAD\CAM technique According to the manufacturer's instructions. Tow rubber thicknesses were taken for the marginal fit of each bridge over its cast gypsum by used light silicone rubber addition. Then the first rubber thickness was treated by developed replica technique to form the Group (A) of the study and the second rubber thickness was treated by replica technique to form the group (B) of the study. Depending on T-test, no significant difference between two techniques was detected. We conclude that developed replica technique reliable technique to study and measure the marginal gap of bridge and crown, and it is statistically more accurate than the traditional technique.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة المخبرية مقارنة بين تقنيتي النسخ المضاعف والنسخ المضاعف المطورة لقياس الانطباق الحفافي للجسور الزيركونية الخلفية المصنعة بتقنية CAD/CAM. بعد إزالة الرحى الأولى السفلية اليمنى من نموذج typodont، تم تحضير الضاحك الثاني والرحى الثانية المجاورتين بما يتناسب مع الترميمات الخزفية الكاملة. تم أخذ طبعة باستخدام المطاط السيليكوني الإضافي وصنع المثال الرئيسي المعدني. تم استخدام 15 طابع إكريلي لعمل 15 طبعة للمثال المعدني الرئيسي، وصنع 15 جسر زيركوني بتقنية CAD/CAM. تم قياس الانطباق الحفافي باستخدام المطاط السيليكوني الإضافي الرخو، وتمت معالجة الرقاقات بتقنيتي النسخ المضاعف والنسخ المضاعف المطورة. أظهرت النتائج عدم وجود فروق دالة إحصائياً بين التقنيتين في متوسط مقدار الفجوة الحفافية، مما يشير إلى أن تقنية النسخ المضاعف المطورة موثوقة وأكثر دقة من التقنية التقليدية.
Critical review
دراسة نقدية: على الرغم من أن الدراسة تقدم مقارنة شاملة بين تقنيتي النسخ المضاعف والنسخ المضاعف المطورة، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الممكن تضمين عدد أكبر من العينات لزيادة قوة النتائج الإحصائية. ثانياً، لم يتم التطرق إلى تأثير العوامل البيئية مثل درجة الحرارة والرطوبة على دقة القياسات. ثالثاً، كان من الممكن تقديم تحليل أعمق للعوامل التي قد تؤثر على دقة التقنية المطورة مقارنة بالتقنية التقليدية. وأخيراً، كان من المفيد تضمين مقارنة مع تقنيات أخرى لقياس الانطباق الحفافي لتعزيز مصداقية النتائج.
Questions related to the research
  1. ما هي التقنية الأكثر دقة في قياس الانطباق الحفافي للجسور الزيركونية الخلفية؟

    تقنية النسخ المضاعف المطورة أظهرت دقة أعلى مقارنة بتقنية النسخ المضاعف التقليدية.

  2. ما هو الهدف الرئيسي من هذه الدراسة؟

    الهدف الرئيسي هو مقارنة دقة وسهولة قياس الانطباق الحفافي للجسور الزيركونية الخلفية بين تقنيتي النسخ المضاعف والنسخ المضاعف المطورة.

  3. ما هي المادة الطابعة المستخدمة في هذه الدراسة؟

    المطاط السيليكوني الإضافي (Zhermack Elite HD+).

  4. هل أظهرت النتائج فروق دالة إحصائياً بين التقنيتين؟

    لا، لم تظهر النتائج فروق دالة إحصائياً بين التقنيتين في متوسط مقدار الفجوة الحفافية.


References used
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BINDLE, A; MORMANN, WH. Marginal and internal fit of allceramic CAD/CAD crown-copings on chamfer preparations. J Oral Rehabil. 2005; 32: 441-447
BLACKMAN, R. BAES, R. BARGHI, N; Marginal accuracy and geometry of cast titanium copings. J Prosthet Dent.1992; 67: 435-440
[Boksman, L. Cowie, R; Making polyvinyl impression: Success lies in the details. Available from >www.thejobcure.com<. 2007; [Jul\Aug
Boksman, L; Point of care how do I minimize the amount of occlusal adjustment necessary for a crown. JCDA. 2005; 71:49-95
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