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題 名 | 次氯酸納對人類牙本質斷裂強度之影響=Effect of Sodium Hypochlorite on Fracture Strength of Human Dentin |
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作 者 | 褚文煌; 李伯訓; 鄭琇月; 林俊彬; 陳瑞松; 藍萬烘; | 書刊名 | 中華牙醫學雜誌 |
卷 期 | 17:2 1998.06[民87.06] |
頁 次 | 頁79-85 |
分類號 | 416.9 |
關鍵詞 | 牙本質斷裂; 次氯酸鈉; 穿透撕裂強度; Dentin fracture; Sodium hypochlorite; Punch shear strength; |
語 文 | 中文(Chinese) |
中文摘要 | 牙齒硬組織主要是由外層較硬但脆弱的牙釉質及內層較軟但韌度較強的牙本質所 形成。牙本質的斷裂韌性是牙齒斷裂的重要決定因素之一,其斷裂機轉是值得進一步的深入 探討。次氯酸鈉為根管治療時常用之沖洗液,它能溶解牙本質的主要有機質-膠原蛋白,這 是否會影響到牙本質的生物力學性質是值是研究的問題。本次研究的目的是在探討次氯酸鈉 對牙本質斷裂強度的影響。材料及方法:製備厚約0.45∼0.50mm之牙本質簿片30片,每片用 手術刀劈成左右兩半分別為實驗組及控制組。實驗組(左半片)分別在1、3、6小時三個時 段,每時段取10片牙本質試片,利用5%次氯酸鈉浸泡,目的在於除去牙本質薄中的有機質; 而對照組(右半片)亦依三個時段浸泡在生理食時鹽水。利用穿透撕裂測試法來探討各組牙 本質受力後斷裂的強度。結果顯示,牙本質試片經5%次氯酸鈉浸泡後穿透斯裂強度有顯著降 低,降低的程度與浸泡的時間有關。由掃描式電子顯微鏡的觀察顯示,牙本質經次氯酸鈉浸 泡後,其斷裂型態由延性斷裂轉為脆性斷裂。因此,我們可以進一步推論,牙本質內之有機 質在牙本質斷裂的機轉中可能扮演極重要之角色,至於在臨床上是否有相同的表現,則須待 更進一步的研究。 |
英文摘要 | Enamel resists fractures poorly and cracks are difficult to discern in dentin due to its resilient supporting property. It has been reported that the collagen fibrils in dentin play a crucial role in resisting fracture. Sodium hypochlorite is a major irrigating solution during root canal treatment. However, sodium hypochlorite also dissolves collagen, which is a major organic component of human dentin. The purpose of this study was to assess the effect of sodium hypochlorite on the fracture strength of dentin. Thirty dentin discs with the thickness of 0.45 to 0.50 mm thick were sectioned transversely from the intact crown of human molars. Each dentin disc was then split in half. One half were immersed in 5% NaOCl for hour, 3 hours or 6 hours, and the other half was treated with 0.9% NaCl as contrlos. After rinsing with normal saline, all specimens were subjected to a punch shear test. The results showed that the punch shear strength of dentin decreased significantly after 1 hour treatment with 5% NaOCl. Longer NaOCl treatment resulted in lower punch shear strength. The fracture pattern of the dentin shifted from ductile to brittle after immersion in NaOCl. This indicates that the organic component of dentin plays an important role in resisting fracture. However, whether NaOCl is a predisposing factor in clinical tooth fracture needs further investigation. |
本系統中英文摘要資訊取自各篇刊載內容。