The effect of monolithic zirconia crown dimension on the accuracy of fit
2
Issued Date
2024
Copyright Date
2020
Resource Type
Language
eng
File Type
application/pdf
No. of Pages/File Size
viii, 31 leaves : ill.
Access Rights
open access
Rights
ผลงานนี้เป็นลิขสิทธิ์ของมหาวิทยาลัยมหิดล ขอสงวนไว้สำหรับเพื่อการศึกษาเท่านั้น ต้องอ้างอิงแหล่งที่มา ห้ามดัดแปลงเนื้อหา และห้ามนำไปใช้เพื่อการค้า
Rights Holder(s)
Mahidol University
Bibliographic Citation
Thesis (M.Sc. (Implant Dentistry))--Mahidol University, 2020
Suggested Citation
Arpapich Boonnithi The effect of monolithic zirconia crown dimension on the accuracy of fit. Thesis (M.Sc. (Implant Dentistry))--Mahidol University, 2020. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/92133
Title
The effect of monolithic zirconia crown dimension on the accuracy of fit
Author(s)
Advisor(s)
Abstract
This study aimed to investigate the influence of monolithic zirconia crown dimension on the accuracy of marginal and internal fit. Four titanium models with various dimensional preparations were constructed. The general designed characteristics were circumferential deep chamfer finish line, round internal line angle, 12°of total occlusal convergence and 10 mm diameter at the margin. For group 1 and 2, the abutment was designed in order to get 1-mm and 2-mm uniform crown thickness, respectively. For group 3, the abutment was designed to get 1-mm thickness at axial wall and 2-mm thickness at occlusal wall, and, conversely, for group 4, the abutment was designed to get 2-mm thickness at axial wall and 1-mm thickness at occlusal wall. Forty identical external contour crowns were fabricated with Ceramill system (n= 10). Replica technique was used to examine marginal gap, absolute marginal discrepancy and additional 3 locations of internal gap: mid-axial wall, axio-occlusal angle and mid-occlusal area. The data were analysed using One-way ANOVA and Turkey's test at a significance level of 0.05. There were significant differences of gaps at most locations, except axial area (P<.05). The mean ± SD of marginal gaps were 27.9±5.4 μm, 32.8±6.8 μm, 32.6±7 μm and 22.3±4.2 μm for group 1, 2, 3 and 4, respectively. The mean ± SD of absolute marginal discrepancies were 131.5±11.7 μm, 111±15.6 μm, 114.5±15.8 μm and 125.9±9.7 μm for group 1, 2, 3 and 4, respectively. The highest internal gap was found at occlusal area in all groups. The thickness of translucent zirconia crown influenced the marginal and internal fit. Occlusal wall thickness could affect the marginal gap, absolute marginal discrepancy and internal gap despite crown's axial wall thickness. Thicker occlusal wall could result in lesser absolute marginal discrepancy and occlusal internal gap, but greater marginal gap. However, the marginal gap in all groups was obviously, clinically acceptable. Therefore, appropriate occlusal crown thickness should be fabricated to avoid unpredictable stress that affected crown fitness and to prevent the fracture of the crown clinically.
Description
Implant Dentistry (Mahidol University 2020)
Degree Name
Master of Science
Degree Level
Master's degree
Degree Department
Faculty of Dentistry
Degree Discipline
Implant Dentistry
Degree Grantor(s)
Mahidol University