音射法(acoustic emission, AE)乃是利用壓電感測器偵測因物體內部發生變化而釋放出彈性波，並造成表面極微振動的方法，將此振動轉換為電子訊號後加以分析，便能夠用以辨識該物體破壞的類型與特徵。數位影像相關係數(digital image correlation, DIC)法藉由物體變形前後表面特殊的斑點記號分布之變化所造成相關係數的差異，以獲得物體表面的位移場與應變，能夠用以監測物體表面之變化。微型電腦斷層掃描(micro computerized tomography, micro-CT)犧牲可掃描之物體最大體積以獲得在小物體擁有高解析度的斷層掃描影像資料，能夠用來清楚獲得物體內部結構的詳細資訊。本研究主要使用音射法輔以數位影像相關係數法與微型電腦斷層掃描以辨識牙本質與填補材料之破裂特徵。實驗設計單軸壓力情況下對三種試片：複合材試片、牙本質試片、填補材料試片進行加載，於加載前使用微型電腦斷層掃描挑出性質相近之試片；於加載過程中蒐集音射訊號並同時擷取數位影像；加載後以微型電腦斷層掃描影像確認破裂之形成，最後分析音射訊號，以獲得牙本質與填補材料之破裂特徵差異。本研究結果顯示，部分音射參數在辨識牙本質與填補材料之破裂特徵確實有效。「平均頻率(average frequency, AF)」方面，牙本質的80.67 kHz(Ch1)和76.50 kHz(Ch2)顯著低於填補材料的98.34 kHz(Ch1)和91.12 kHz(Ch2)；「總撞擊數」特徵方面，牙本質之「總撞擊數」顯著高於填補材料；與混凝土材料相似，「上升角(RA)」與「平均頻率(AF)」之二維破裂模式分布圖於牙科領域中同樣能夠對單軸壓力實驗下牙科材料之破裂模式進行辨別。

Operative dentistry restores the decayed tooth to recover their aesthetics and functions, the most important is to prevent tooth from occurring caries once again. According to different situation to choose filling composites, such as amalgam, ceramic and composite resin. Composite resin was used as the material in this study, which may be due to contraction stress or higher bite force and lead restoration to failure. In recent years, a lot of dental researches have applied acoustic emission (AE) technique to investigate how different restoration designs or materials influence the quantity of AE signals during loading process, no further analysis about AE signals. The aim of this study is applying AE technique to locate the failure position by distinguishing the cracking characterizations between dentine and filling composites through analyzing the AE signals. Except AE technique were used, there were other two non-destructive testing (NDT)were used in this study as well, digital image correlation (DIC) technique and micro computerized tomography (micro-CT) technique, that were used to assist analysis. According to the statistics results of the test, some of AE parameters were indeed effective on distinguishing the cracking characterizations between dentine and filling composites. The total hits and the mean value of average frequency (AF) of cracking signals of dentine were higher than filling composite. In addition, the 2-D cracking mode distribution figure made up of rise angle (RA) and AF could identify the cracking mode of dental materials under uniaxial compressive test.

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