硼酸和磷酸对玻璃离子水门汀抗压强度的影响。
The effects of boric acid and phosphoric acid on the compressive strength of glass-ionomer cements.
作者信息
Prentice Leon H, Tyas Martin J, Burrow Michael F
机构信息
School of Dental Science, University of Melbourne, 711 Elizabeth Street, Parkville, Victoria 3010, Australia.
出版信息
Dent Mater. 2006 Jan;22(1):94-7. doi: 10.1016/j.dental.2005.04.004. Epub 2005 Jul 19.
OBJECTIVES
Both boric acid (H3BO3) and phosphoric acid (H3PO4) are components of dental cements, commonly incorporated into glass (as ingredients in the melt) and occasionally added to the powder or liquid components. This study investigated the effect of boric acid addition to an experimental glass-ionomer powder and the effect of phosphoric acid addition to a glass-ionomer liquid on the 24-h compressive strength.
METHODS
Boric acid powder was added in various concentrations to an experimental glass-ionomer powder and, separately, phosphoric acid was added to an experimental glass-ionomer liquid. Powders and liquids were dosed into capsules at various powder:liquid ratios and cements thus formed were assessed for 24-h compressive strength.
RESULTS
Incorporation of boric acid in glass-ionomer powder resulted in a pronounced decrease (p < 0.05 at 1% boric acid) in compressive strength. Addition of phosphoric acid produced initially stronger cements (up to 13% increase at 1% phosphoric acid) before also declining.
SIGNIFICANCE
The incorporation of less than 2% w/w phosphoric acid in glass-ionomer liquids may improve cement strengths without compromising clinical usefulness. The incorporation of boric acid in glass-ionomer cements is contraindicated.
目的
硼酸（H3BO3）和磷酸（H3PO4）都是牙科水门汀的成分，通常被加入玻璃中（作为熔体中的成分），偶尔也添加到粉末或液体成分中。本研究调查了向实验性玻璃离子粉末中添加硼酸以及向玻璃离子液体中添加磷酸对24小时抗压强度的影响。
方法
将不同浓度的硼酸粉末添加到实验性玻璃离子粉末中，另外，将磷酸添加到实验性玻璃离子液体中。将粉末和液体按不同的粉液比装入胶囊，对由此形成的水门汀进行24小时抗压强度评估。
结果
在玻璃离子粉末中加入硼酸会导致抗压强度显著降低（1%硼酸时p<0.05）。添加磷酸最初会使水门汀强度增强（1%磷酸时强度增加高达13%），之后强度也会下降。
意义
在玻璃离子液体中加入低于2%w/w的磷酸可能会提高水门汀强度，而不影响其临床实用性。玻璃离子水门汀中禁止加入硼酸。
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