醫(yī)學免費論文:不同離子交換時間和溫度對白榴石增強陶瓷彎曲強度的影響

醫(yī)學免費論文:不同離子交換時間和溫度對白榴石增強陶瓷彎曲強度的影響

【摘要】目的: 研究不同離子交換時間和溫度對白榴石增強陶瓷雙軸彎曲強度的影響，為臨床應用提供參考. 方法: 試件的蠟型制作采用將融化的鑄造蠟灌注于機械加工模具內(nèi)，制成厚度和直徑一致的蠟型. 厚度為2.0 mm，直徑為18 mm圓片，共90個. 實驗分組首先按照同一時間下不同溫度即離子交換溫度為400℃，450℃，500℃，離子交換時間為3 h，每組試件10個. 然后在確定最佳離子交換溫度的基礎(chǔ)上以不同時間分組即交換時間為3，5，7，9，11 h，每組試件10個. 以不做打磨、上釉和離子交換的為對照組，試件為10個. 根據(jù)ASTM標準 F394��78.1991（美國材料實驗協(xié)會)測試試件的雙軸彎曲強度. 經(jīng)one�瞱ay ANOVA及Kruskal�瞁allis秩和檢驗統(tǒng)計分析各實驗組. 結(jié)果: 同一處理時間不同處理溫度下的雙軸彎曲強度經(jīng)統(tǒng)計分析可知有統(tǒng)計學差異(P<0.01). 同一處理溫度不同處理時間下的雙軸彎曲強度經(jīng)統(tǒng)計分析可知有統(tǒng)計學差異(P<0.01). 與對照組比較均存在統(tǒng)計學差異(P<0.01). 結(jié)論: cerinate熱壓鑄陶瓷的離子交換處理較佳的溫度為450℃，時間為11 h.

【關(guān)鍵詞】  牙瓷料；陶瓷；離子交換；雙軸彎曲強度

Effect of different time/temperature of ion exchange on the biaxial flexural strength of heat pressed ceramic

WANG Hui, CHEN Ji�睭ua,  SHI Chang�瞂i, SHEN Li�睯uan

Department of Prosthodontics, College of Stomatology, Fourth Military Medical University, Xi�餫n 710033, China

【Abstract】 AIM: To study the effect of different time/temperature of ion exchange on the biaxial flexural strength of heat pressed ceramic. METHODS: Eighty disks of Cerinate ceramic specimens (shade 2), 18 mm in diameter and 2.0 mm thick, were prepared. The specimens were manufactured according to the company�餾 recommendations. Ten disks were used as controls. The remaining disks were divided into 7 groups of 10 disks each and ion�瞖xchanged specimens were made by the treatment of potassium salt at 400℃, 450℃, 500℃ for 3 h and at the optimal temperature for 5, 7, 9, 11 h. The biaxial flexural strength was evaluated by a three�瞤oint bending in a universal machine according to ASTM Standard (F394��78.1991). RESULTS: The bia�瞲ial flexural strength had significant difference among different treatment temperature and time groups (P<0.01). Compared with control group, the biaxial flexural strength of each experimental group was also statistically significantly different (P<0.01).  CONCLUSION: The ion�瞖xchange process of the Ceri�瞡ate hot pressed ceramic should be performed at 450℃ for 11 h.

【Keywords】 dental porcelain; porcelain; ion�瞖xchange; biaxial flexural strength醫(yī).學.全.在.線m.quanxiangyun.cn

 0引言

隨著人們對牙科修復體的美觀要求的增加,越來越多的臨床醫(yī)生關(guān)注于陶瓷材料的美觀性和生物相容性，但由于陶瓷材料自身的缺點如脆性大、強度差. 作為牙科修復材料在燒結(jié)過程中在瓷表面形成張應力和微裂紋，從而降低了陶瓷的強度，影響其在口腔復雜的化學環(huán)境下的使用壽命. 因此應運而生了陶瓷表面增強技術(shù)，以減少和防止陶瓷表面微裂紋的產(chǎn)生和擴散. 陶瓷表面增強技術(shù)的離子在陶瓷表面的擴散率受交換的溫度和交換時間的影響，因此需要確定最佳的交換時間和溫度，使熱壓鑄陶瓷表面強度獲得最佳, 為臨床應用提供依據(jù)和參考.

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