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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of casting technique on surface roughness and consequent mass loss after polishing of NiCr and CoCr base metal alloys: a comparative study with titanium.
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Effect of casting technique on surface roughness and consequent mass loss after polishing of NiCr and CoCr base metal alloys: a comparative study with titanium.

机译：铸造工艺对NiCr和CoCr贱金属合金抛光后表面粗糙度和随之而来的质量损失的影响：与钛的比较研究。

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STATEMENT OF PROBLEM: Surface roughness of cast metal frameworks may lead to difficulties in finishing or polishing procedures and weaken the framework. PURPOSE: The aim of this study was to assess the surface roughness of 2 base metal alloys, submitted to different casting techniques, to determine the influence of surface roughness on loss of mass after polishing compared to commercially pure titanium castings. MATERIAL AND METHODS: Forty disk-shaped wax patterns (8 x 2 mm) were randomly assigned to 5 groups (n=8): (1) CoCr alloy (Wironit), acetylene-oxygen flame casting (WFC), (2) NiCr alloy (Verabond II), acetylene-oxygen flame casting (VFC), (3) CoCr alloy, vacuum casting (WVC), (4) NiCr alloy, vacuum casting (VVC), and (5) commercially pure Ti alloy (Ti) melted by electric arc in argon gas atmosphere. WFC and VFC served as controls. Both NiCr and CoCr alloys were invested in phosphate-bonded investment (Termocast). Ti was invested in ammonium dihydrogen phosphate (Rematitam Plus). The wax patternsand casting techniques were standardized. All specimens were cleaned with airborne-particle abrasion (aluminum oxide). Surface roughness (Ra) was assessed using a surface-test analyzer at 3 different sites. To evaluate the loss of mass, the specimens were weighed on a precision balance, then polished with 150-600 grain sandpaper until clinically acceptable (minimum roughness of 0.09 microm). The specimens were then reweighed. A 1-way analysis of variance (ANOVA) and Tukey HSD test (alpha=.05) were performed. RESULTS: Statistical analysis showed that VVC and WVC had significantly (P=.0050; P=.0057) smoother surfaces (2.43 +/- 0.53 and 2.23 +/- 0.49, respectively) than VFC and WFC (2.99 +/- 0.44 and 2.83 +/- 0.61, respectively), but were not significantly different from Ti (2.49 +/- 0.62). The loss of mass (in %) was not significantly different for any group (3.18 +/- 0.72, 3.14 +/- 0.93, 3.36 +/- 1.05%, and 4.14 +/- 1.28% for VVC, WVC, VFC, and WFC, respectively). The mass loss of Ti was 4.32 +/- 1.16. CONCLUSION: Within the limitations of this study, the base metal alloys submitted to vacuum casting showed decreased surface roughness, similar to that of titanium, compared to base metal alloys submitted to acetylene-oxygen flame casting. There were no significant differences in loss of mass after polishing for all tested specimens.
机译：问题陈述：铸造金属框架的表面粗糙度可能导致精加工或抛光过程中的困难并削弱框架。目的：本研究的目的是评估两种贱金属合金的表面粗糙度，并采用不同的铸造技术，以确定与商业纯钛铸件相比，表面粗糙度对抛光后质量损失的影响。材料和方法：将40个盘形蜡图案（8 x 2 mm）随机分配给5组（n = 8）：（1）CoCr合金（Wironit），乙炔-氧气火焰铸造（WFC），（2）NiCr合金（Verabond II），乙炔-氧气火焰铸造（VFC），（3）CoCr合金，真空铸造（WVC），（4）NiCr合金，真空铸造（VVC）和（5）商业纯钛合金（Ti）在氩气气氛中被电弧熔化。 WFC和VFC充当控件。 NiCr和CoCr合金均进行了磷酸盐粘结的投资（Termocast）。将钛投入磷酸二氢铵（Rematitam Plus）中。蜡模和铸造技术已标准化。所有标本均用空气颗粒磨料（氧化铝）清洁。使用表面测试分析仪在3个不同的位置评估表面粗糙度（Ra）。为了评估质量损失，将样品在精密天平上称重，然后用150-600粒度的砂纸打磨直至临床可接受（最小粗糙度为0.09微米）。然后将样品重新称重。进行了1方差分析（ANOVA）和Tukey HSD检验（alpha = .05）。结果：统计分析表明，VVC和WVC的表面比VFC和WFC的表面光滑（分别为2.43 +/- 0.53和2.23 +/- 0.49）（分别为2.43 +/- 0.53和2.23 +/- 0.49）（2.99 +/- 0.44和分别为2.83 +/- 0.61），但与Ti（2.49 +/- 0.62）没有显着差异。任何组的质量损失（％）均无显着差异（VVC，WVC，VFC和VVC分别为3.18 +/- 0.72、3.14 +/- 0.93、3.36 +/- 1.05％和4.14 +/- 1.28％ WFC）。 Ti的质量损失为4.32 +/- 1.16。结论：在本研究的范围内，与进行乙炔-氧气火焰铸造的贱金属合金相比，进行真空铸造的贱金属合金的表面粗糙度降低了，与钛相似。对于所有测试样品，抛光后质量损失均无显着差异。

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