NaF含量对柔性牙龈赝复材料释氟量及扯断强度的影响  

Effect of NaF content on the fluoride release and tensile strength of flexible gingival epitheses material

作　　者：赵信义[1] 康彪[1] 李峰[1] 

机构地区：[1]第四军医大学口腔医学院,陕西西安710032

出　　处：《牙体牙髓牙周病学杂志》2005年第5期283-285,共3页Chinese Journal of Conservative Dentistry

摘　　要：目的:评价NaF加入量对柔性牙龈赝复材料释氟量及扯断强度的影响。方法:将不含及含10g/L、30g/L和50g/LNaF的柔性牙龈赝复材料制成1mm厚的片材并热硫化,然后裁切成供释氟试验的正方形试样(20mm×20mm)和供扯断试验的哑铃形试样。将每个正方形试样放入装有7mL人工唾液的塑料瓶中,然后放入37℃恒温箱,每天更换人工唾液。用氟离子选择电极测定第7d、第14d、第30d、第60d、第90d及第180d时浸泡液中的氟离子浓度(ppm)。在拉伸试验机上测定哑铃形试样的扯断强度。结果:含NaF的材料释氟量均显著大于不含NaF的材料,其中含50g/L和30g/LNaF材料的释氟量均明显大于含10g/LNaF的材料(P<0.01),而含50g/LNaF的材料在90d测定期前(包括90d)的释氟量明显大于含30g/LNaF的材料(P<0.01),但在180d测定期时,两者的释氟量差异不明显(P>0.05)。随着NaF含量的增加,材料的扯断强度逐渐下降,当NaF含量达到50g/L时,扯断强度已明显低于不含NaF的材料(P<0.05)。结论:在柔性牙龈赝复材料中加入NaF可赋予其缓释氟功能,NaF的加入量对材料的释氟量和扯断强度有明显的影响。AIM:To evaluate the effect of NaF content on the fluoride releasing characteristics and tensile strength of flexible gingival epitheses material.METHODS:Cuboid samples (1 mm×20 mm×20 mm) for fluoride releasing test and dumbbell samples for tensile strength testing were prepared from flexible gingival epitheses materials containing NaF 0%,10 g/L,30 g/L and 50 g/L respectively.Each cuboid sample was stored in a plastic vials containing 7 mL of artificial saliva at 37℃.The artificial saliva were changed every day.An ion- selective electrode connected to an ion analyzer was used to determine the amount of fluoride released at the days of 7,14,30,60,90 and 180.The tensile strength of dumbbell samples were tested in a tensile tester.RESULTS:All of the fluoride-containing materials demonstrated a higher fluoride release than the none-fluoride materials. The material containing 50 g/L and 30 g/L NaF released significantly more fluoride than that of 10 g/L NaF( P <0.01).Though the material containing 50 g/L NaF released significantly more fluoride than that of 30 g/L NaF at the days ≤90 days, they did not show significant difference at 180 days ( P >0.05) .As fluoride additions increased, tensile strength of the material tends to decrease and when fluoride content reached 50 g/L,tensile strength of the material was significantly lower than that of non-flouride material.CONCLUSION:Flexible gingival epitheses material containing NaF can releases fluoride and NaF content has a significant effect on the fluorides releasing characteristics and tensile strength.

关 键 词：牙龈萎缩 牙龈赝复体 硅橡胶 离子释放 

分 类 号：R783.1[医药卫生—口腔医学]