Wear behavior of polished and glazed ultra-translucent cubic zirconia against natrual enamel : An in-vitro study / By Mohamed Safwat Massoud; SUPERVISORS Prof. Gihan Abdelhady El-naggar, Ass.prof. Dr. Reham Saied El Basty.

By:

Mohamed Safwat Massoud [preparation.]

Contributor(s):

Material type: Text

TextLanguage: English Summary language: English, Arabic Producer: 2023Description: 113 pages : illustrations ; 25 cm. + CDContent type:

text

Media type:

Unmediated

Carrier type:

volume

Other title:

سلوك تآكل الزركونيا المكعبة فائقة الشفافيه المصقوله والمزججه ضد المينا الطبيعيه : دراسة معمليه [Added title page title]

Subject(s):

DDC classification:

617.692

Available additional physical forms:

Issued also as CD

Dissertation note: Thesis (M.Sc.)-Cairo University, 2023. Summary: Objectives: The purpose of this in vitro study was to assess the effect of two surface finishing protocolos ( Polishing and Glazing) on surface roughness as well as wear behavior of polished and glazed ultra-translucent cubic zirconia against natural enamel. Methodology: A total of eighteen CAD/CAM fabricated ultra-translucent multilayered cubic zirconia crowns were constructed. Crown samples were then sintered in program at S1 sintering furnace according to manufacturer instructions. Crown samples were divided into two groups according to the surface finishing protocols. Group1: Polishing surface finish. n=9. Group2: Glazing surface finish. n=9. Surface roughness was assessed by a non-contact profilometer while wear behavior was assessed by 3D superimposition. Results: An overall comparison between both groups regarding the amount of surface roughness before wear simulation revealed that there was no statistically significant difference between mean Ra of polished (0.204 µm) and glazed zirconia (0.225 µm). overall comparison between both groups regarding amount of surface roughness after wear simulation revealed that there was no statistically significant difference between mean Ra of polished (0.25 µm) and glazed zirconia (0.2539 µm). With regard to results of the variables interaction on surface roughness (Ra) before and after wear simulation, the mean Ra values for polished zirconia crowns before and after wear testing were (0.204 µm) and (0.25 µm) respectively. On the other hand, the mean Ra values for glazed zirconia crowns before and after wear simulation were (0.225 µm) and (0.2539 µm) respectively. So, there was a statistically significant increase in mean Ra after wear testing in both groups. With reference to the results of the comparison between changes in surface roughness (ΔRa) of glazed and polished zirconia, the mean (ΔRa) of polished zirconia crowns was (0.046 µm), while the mean (ΔRa) of glazed zirconia crowns was (0.0288 µm). Therefore, glazed zirconia crowns showed statistically significant lower change in surface roughness (ΔRa) than polished zirconia crowns. Regarding superimposition method, the mean RMS values of polished and glazed zirconia were (0.1158 µm) and (0.1655 µm), respectively. Therefore, there was no statistically significant difference between RMS of polished and glazed zirconia crowns. Regarding the results of correlation between surface roughness changes and root mean square, there was a direct correlation between (ΔRa) and (RMS) with no statistical significance. (Correlation coefficient = 0.166, P-value = 0.510). Conclusions: 1-Surface roughness of ultra-translucent multilayered cubic zirconia increased after wear simulation in both tested groups (Polishing and Glazing) with greater surface roughness changes observed in the polished group. 2-Both surface finishing protocols (Polishing and Glazing) showed comparable wear behavior in ultra-translucent multilayered cubic zirconia crowns. 3-Polishing and glazing can be used alternatively as surface finishing protocols for Ultra-translucent multilayered cubic zirconia crowns. 4-Direct correlation was found between the surface roughness changes produced by both tested surface finish protocol (Polishing and Glazing) and wear behavior of ultra-translucent multilayered cubic zirconia crowns.Summary: أصبح البحث عن أفضل نتيجة جمالية إلزاميا في الوقت الحاضر للمريض عند استعادة أسنانه ، ليس هذا فحسب ، بل أيضا يتم التأكيد على طول عمر ومتانة هذه النتيجة بشكل كبير من قبل المرضى. لذا فإن اختيار المواد لتلبية جميع متطلبات المريض يصبح عملية أكثر تعقيدا وتصبح التشطيبات السطحية النهائية ذات أهمية كبيرة ليس فقط لزيادة طول عمر ترميم الأسنان ولكن أيضا لحفظ الأسنان المقابلة. في الآونة الأخيرة ، أدى التقدم في سيراميك الأسنان إلى تحسين خصائصها الميكانيكية والبصرية بشكل كبير للتغلب على عيوب جميع عمليات ترميم السيراميك على مدى عقود مثل التقطيع والتشقق والتآكل وتفريغ سيراميك القشرة. يتم تقديم مجموعة متنوعة من سيراميك الأسنان في السوق من بينها زركونيا مكعبة متعددة الطبقات فائقة الشفافية والتي تجذب العديد من أطباء الأسنان في جميع أنحاء العالم بسبب خصائصها الميكانيكية الممتازة والتوافق الحيوي والجماليات الجيدة مقارنة بمادة ثنائي سيليكات الليثيوم منخفضة الشفافية. يمكن أن تؤثر بروتوكولات تشطيب الأسطح المستخدمة لهذه المادة على خشونة سطحها وسلوك التآكل إلى حد ما. ومع ذلك ، لا يزال نقص المعرفة العلمية حول خشونة سطحه وسلوك التآكل موجودا ويحتاج إلى مزيد من التحقيقات. لذا فإن الهدف من هذه الدراسة في المختبر هو تقييم بروتوكولات التشطيب المختلفة المطبقة على الزركونيا المتجانسة متعددة الطبقات المكعبة فائقة الشفافية التي تم إدخالها حديثا وتأثيرها على خشونة السطح وكذلك سلوك التآكل.

Tags from this library: No tags from this library for this title. Log in to add tags.

Average rating: 0.0 (0 votes)

Holdings
Item type	Current library	Home library	Call number	Status	Barcode
Thesis	قاعة الرسائل الجامعية - الدور الاول	المكتبة المركزبة الجديدة - جامعة القاهرة	Cai01.09.09.M.Sc.2023.Mo.W. (Browse shelf(Opens below))	Not for loan	01010110090644000

Thesis (M.Sc.)-Cairo University, 2023.

Bibliography: pages 96-109.

Objectives: The purpose of this in vitro study was to assess the effect of two surface finishing protocolos ( Polishing and Glazing) on surface roughness as well as wear behavior of polished and glazed ultra-translucent cubic zirconia against natural enamel. Methodology: A total of eighteen CAD/CAM fabricated ultra-translucent multilayered cubic zirconia crowns were constructed. Crown samples were then sintered in program at S1 sintering furnace according to manufacturer instructions. Crown samples were divided into two groups according to the surface finishing protocols. Group1: Polishing surface finish. n=9. Group2: Glazing surface finish. n=9. Surface roughness was assessed by a non-contact profilometer while wear behavior was assessed by 3D superimposition. Results: An overall comparison between both groups regarding the amount of surface roughness before wear simulation revealed that there was no statistically significant difference between mean Ra of polished (0.204 µm) and glazed zirconia (0.225 µm). overall comparison between both groups regarding amount of surface roughness after wear simulation revealed that there was no statistically significant difference between mean Ra of polished (0.25 µm) and glazed zirconia (0.2539 µm). With regard to results of the variables interaction on surface roughness (Ra) before and after wear simulation, the mean Ra values for polished zirconia crowns before and after wear testing were (0.204 µm) and (0.25 µm) respectively. On the other hand, the mean Ra values for glazed zirconia crowns before and after wear simulation were (0.225 µm) and (0.2539 µm) respectively. So, there was a statistically significant increase in mean Ra after wear testing in both groups. With reference to the results of the comparison between changes in surface roughness (ΔRa) of glazed and polished zirconia, the mean (ΔRa) of polished zirconia crowns was (0.046 µm), while the mean (ΔRa) of glazed zirconia crowns was (0.0288 µm). Therefore, glazed zirconia crowns showed statistically significant lower change in surface roughness (ΔRa) than polished zirconia crowns. Regarding superimposition method, the mean RMS values of polished and glazed zirconia were (0.1158 µm) and (0.1655 µm), respectively. Therefore, there was no statistically significant difference between RMS of polished and glazed zirconia crowns. Regarding the results of correlation between surface roughness changes and root mean square, there was a direct correlation between (ΔRa) and (RMS) with no statistical significance. (Correlation coefficient = 0.166, P-value = 0.510). Conclusions:
1-Surface roughness of ultra-translucent multilayered cubic zirconia increased after wear simulation in both tested groups (Polishing and Glazing) with greater surface roughness changes observed in the polished group.
2-Both surface finishing protocols (Polishing and Glazing) showed comparable wear behavior in ultra-translucent multilayered cubic zirconia crowns.
3-Polishing and glazing can be used alternatively as surface finishing protocols for Ultra-translucent multilayered cubic zirconia crowns.
4-Direct correlation was found between the surface roughness changes produced by both tested surface finish protocol (Polishing and Glazing) and wear behavior of ultra-translucent multilayered cubic zirconia crowns.

أصبح البحث عن أفضل نتيجة جمالية إلزاميا في الوقت الحاضر للمريض عند استعادة أسنانه ، ليس هذا فحسب ، بل أيضا يتم التأكيد على طول عمر ومتانة هذه النتيجة بشكل كبير من قبل المرضى. لذا فإن اختيار المواد لتلبية جميع متطلبات المريض يصبح عملية أكثر تعقيدا وتصبح التشطيبات السطحية النهائية ذات أهمية كبيرة ليس فقط لزيادة طول عمر ترميم الأسنان ولكن أيضا لحفظ الأسنان المقابلة. في الآونة الأخيرة ، أدى التقدم في سيراميك الأسنان إلى تحسين خصائصها الميكانيكية والبصرية بشكل كبير للتغلب على عيوب جميع عمليات ترميم السيراميك على مدى عقود مثل التقطيع والتشقق والتآكل وتفريغ سيراميك القشرة. يتم تقديم مجموعة متنوعة من سيراميك الأسنان في السوق من بينها زركونيا مكعبة متعددة الطبقات فائقة الشفافية والتي تجذب العديد من أطباء الأسنان في جميع أنحاء العالم بسبب خصائصها الميكانيكية الممتازة والتوافق الحيوي والجماليات الجيدة مقارنة بمادة ثنائي سيليكات الليثيوم منخفضة الشفافية. يمكن أن تؤثر بروتوكولات تشطيب الأسطح المستخدمة لهذه المادة على خشونة سطحها وسلوك التآكل إلى حد ما. ومع ذلك ، لا يزال نقص المعرفة العلمية حول خشونة سطحه وسلوك التآكل موجودا ويحتاج إلى مزيد من التحقيقات. لذا فإن الهدف من هذه الدراسة في المختبر هو تقييم بروتوكولات التشطيب المختلفة المطبقة على الزركونيا المتجانسة متعددة الطبقات المكعبة فائقة الشفافية التي تم إدخالها حديثا وتأثيرها على خشونة السطح وكذلك سلوك التآكل.

Issued also as CD

Text in English and abstract in English.

There are no comments on this title.

to post a comment.

Click on an image to view it in the image viewer