醫(yī)學(xué)免費(fèi)論文:不同離子交換時(shí)間和溫度對白榴石增強(qiáng)陶瓷彎曲強(qiáng)度的影響

醫(yī)學(xué)免費(fèi)論文:不同離子交換時(shí)間和溫度對白榴石增強(qiáng)陶瓷彎曲強(qiáng)度的影響

【摘要】目的: 研究不同離子交換時(shí)間和溫度對白榴石增強(qiáng)陶瓷雙軸彎曲強(qiáng)度的影響，為臨床應(yīng)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(jī)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(gè). 實(shí)驗(yàn)分組首先按照同一時(shí)間下不同溫度即離子交換溫度為400℃，450℃，500℃，離子交換時(shí)間為3 h，每組試件10個(gè). 然后在確定最佳離子交換溫度的基礎(chǔ)上以不同時(shí)間分組即交換時(shí)間為3，5，7，9，11 h，每組試件10個(gè). 以不做打磨、上釉和離子交換的為對照組，試件為10個(gè). 根據(jù)ASTM標(biāo)準(zhǔn) F394��78.1991（美國材料實(shí)驗(yàn)協(xié)會)測試試件的雙軸彎曲強(qiáng)度. 經(jīng)one�瞱ay ANOVA及Kruskal�瞁allis秩和檢驗(yàn)統(tǒng)計(jì)分析各實(shí)驗(yàn)組. 結(jié)果: 同一處理時(shí)間不同處理溫度下的雙軸彎曲強(qiáng)度經(jīng)統(tǒng)計(jì)分析可知有統(tǒng)計(jì)學(xué)差異(P<0.01). 同一處理溫度不同處理時(shí)間下的雙軸彎曲強(qiáng)度經(jīng)統(tǒng)計(jì)分析可知有統(tǒng)計(jì)學(xué)差異(P<0.01). 與對照組比較均存在統(tǒng)計(jì)學(xué)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(shí)間為11 h.

【關(guān)鍵詞】  牙瓷料；陶瓷；離子交換；雙軸彎曲強(qiáng)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(xué).全.在.線m.f1411.cn

 0引言

隨著人們對牙科修復(fù)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(diǎn)如脆性大、強(qiáng)度差. 作為牙科修復(fù)材料在燒結(jié)過程中在瓷表面形成張應(yīng)力和微裂紋，從而降低了陶瓷的強(qiáng)度，影響其在口腔復(fù)雜的化學(xué)環(huán)境下的使用壽命. 因此應(yīng)運(yùn)而生了陶瓷表面增強(qiáng)技術(shù)，以減少和防止陶瓷表面微裂紋的產(chǎn)生和擴(kuò)散. 陶瓷表面增強(qiáng)技術(shù)的離子在陶瓷表面的擴(kuò)散率受交換的溫度和交換時(shí)間的影響，因此需要確定最佳的交換時(shí)間和溫度，使熱壓鑄陶瓷表面強(qiáng)度獲得最佳, 為臨床應(yīng)用提供依據(jù)和參考.

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