臺灣博碩士論文加值系統

本研究評估染色液不同浸泡時間與不同表面處理對於全解剖型態氧化鋯的光學性質與力學性質的影響。實驗樣本為小臼齒型態白色氧化鋯共180顆，依照不同浸泡時間(0，0.5，2和5分鐘)分成四組，分別給予C-0，C-0.5，C-2和C-5四種編號。每組含有45個氧化鋯冠。其後再將每組樣本依照表面處理方式，分成沒有處理(CN)、拋光(CP)以及上釉(CG)三組，每組有15個氧化鋯冠。氧化鋯冠的光學特性，是將氧化鋯冠分別置於白色和黑色背景下，使用光譜儀量測國際照明委員會制定的L*, a*, b*三個座標數值，來表示眼睛看到的顏色。其後再計算氧化鋯冠與VITA 經典16色比色板之A3比色板的色差，以及氧化鋯冠在白色和黑色背景下的色差。氧化鋯冠的破壞強度則使用萬能試驗機進行測試。研究結果顯示不同染色液浸泡時間以及表面處理會影響氧化鋯冠的顏色表現以及力學性質。氧化鋯冠的特明度較無法使用染色液浸泡時間獲得改善。

Objective. The present study was aimed to investigate the effects of the immersion time of coloring liquid and surface treatments on color appearance and fracture resistance of the anatomic-contour zirconia.
Methods. Anatomic-contour premolar-crowns specimens were fabricated and divided into 4 groups (n = 45) according to the immersion time of A3-coloring liquid applications: 0 min (C-0); 0.5 min (C-0.5); 2 min (C-2); and 5 min (C-5). Each group was then divided into 3 subgroups (n= 15) according to the surface treatment: no treatment (N); polished (P); and glazed (G). CIELab* color coordinates were measured by using a spectrophotometer. The color difference (ΔE) between the test groups and an A3 shade tab of a VITA classical shade guide, and the translucency parameter (TP) were calculated. Critical load to fracture was determined using uniaxial loading. Data were analyzed using 2-way ANOVA and Bonferronipost hoc (α = 0.05).
Results. The interaction effects of surface treatments combined with the immersion time of coloring liquid were significant for CIEL* and CIEb* values as well as ΔE and TP. C-0.5 groups were within the perceptibility threshold (ΔE < 2.72) regardless of surface treatment used. The CN-0 group had the highest translucency with a TP of 10.0, while the CP-5 had the lowest translucency with a TP of 2.8.
Conclusion. The CIELab* values of anatomic-contour zirconia ceramics can be controlled by means of an immersion period in coloring liquid and the additional glazing procedure to match neighboring restorations or natural teeth. The translucency of the anatomic-contour zirconia ceramics was affected by the coloring procedure and surface treatments.

Contents
臺北醫學大學碩士學位考試委員審定書 I
臺北醫學大學電子暨紙本學位論文書目同意公開申請書 II
臺北醫學大學學位考試保密同意書季暨簽到表 III
Acknowledgment IV
Contents V
Table caption VII
Figure caption VIII
中文摘要 IX
Abstract X
1. Introduction 1
1.1 Research background 1
1.2 Motivation and subject of research 2
1.3 Purpose of research 3
2. Literature review 5
2.1 All- ceramic systems 5
2.2 Zirconia ceramics 5
2.3 Fabrication of zirconia restorations 6
2.4 Esthetics of anatomically-contoured zirconia 7
2.5 Color systems 7
3. Materials and methods 9
3.1 Materials 9
3.2 Preparation of experimental crowns 10
3.3 Experimental procedure 11
3.3 Experimental groups 12
3.4 Measurement of optical properties 13
3.3 Critical load to fracture 16
3.4 Statistical analysis 17
4. Results and discussions 18
5. Conclusions 23
Reference 24


Table caption
Table 4. 1 Two-way ANOVA results of CIBLab* values for immersion time, surface treatments, and their interactions 28
Table 4. 2 Means and standard deviations in parentheses for translucency parameter (TP) of each group 29
Table 4. 3 Two-way ANOVA results of translucency parameter (TP) value for immersion time, surface treatments, and their interactions 30


Figure caption
Figure 4. 1 Means of lightness (L*) values. 31
Figure 4. 2 Mean CIEL* values for 3 surface treatments in all immersion period. 32
Figure 4. 3 Means of red-green (a*) values. 33
Figure 4. 4 Mean CIEa* values for (a) different immersion time, and (b) different surface treatment 34
Figure 4. 5 Means of yellow-blue (b*) values. 35
Figure 4. 6 Mean CIEb* values for all immersion in all 3 surface treatments. 36
Figure 4. 7 Mean CIEL* values for 3 surface treatments in all immersion period. 37
Figure 4. 8 Means of color difference 38
Figure 4. 9 Mean ΔΕ values for all immersion in all 3 surface treatments. 39
Figure 4. 10 Mean ΔΕ values for 3 surface treatments in all immersion period. 40
Figure 4. 11 Mean TP values for different immersion time. 41
Figure 4. 12 Mean TP values for different surface treatment 42

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