中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (38): 5697-5702.doi: 10.3969/j.issn.2095-4344.2016.38.011

• 组织工程口腔材料 tissue-engineered oral materials • 上一篇    下一篇

纳米羟基磷灰石复合树脂材料细胞毒性及在牙体缺损修复中的应用

王  璞1,韦丽宾2
  

  1. 1河北医科大学第二医院口腔修复科,河北省石家庄市  050000;2河北医科大学附属华北石油管理局总医院口腔科,河北省沧州市  062552
  • 出版日期:2016-09-16 发布日期:2016-09-16
  • 通讯作者: 王璞,河北医科大学第二医院口腔修复科,河北省石家庄市 050000
  • 作者简介:王璞,女,1981年生,山东省日照市人,汉族,硕士,主治医师,主要从事口腔修复研究。

Nano-hydroxyapatite/composite resin: cytototoxicity and application in dental restoration

Wang Pu1, Wei Li-bin2
  

  1. 1Department of Prosthodontics, the Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China; 2Department of Stomatology, Affiliated General Hospital of North China Petroleum Administration Bureau, Hebei Medical University, Cangzhou 062552, Hebei Province, China
  • Online:2016-09-16 Published:2016-09-16
  • Contact: Wang Pu, Department of Prosthodontics, the Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China
  • About author:Wang Pu, Master, Attending physician, Department of Prosthodontics, the Second Hospital of Hebei Medical University, Shijiazhuang 050000, Hebei Province, China

摘要:

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文题释义:
肿瘤干细胞
:牙科光固化复合树脂虽然已在临床上得到应用,但在性能方面仍然存在某些不足,所以如何进一步提高其性能成为目前研究的热点之一。羟基磷灰石是脊椎动物骨骼和牙齿的主要无机成分,已被广泛应用于口腔医学之中。纳米羟基磷灰石具有良好的生物活性、生物相容性、生物安全性,其晶体结构在成分方面与牙体硬组织及天然骨十分接近。以往王云等报道,以含55%的纳米羟基磷灰石与光固化树脂基质制备成的复合材料,其压缩强度和挠曲强度能够达到牙科修复材料的要求。
材料修复牙体缺损后的评估指标:龈沟液主要由各种龈下菌斑微生物的代谢产物等组成,与牙周组织炎症的发生之间存在十分密切的联系。在机体正常健康状态下,天冬氨酸转氨酶大多存在于细胞胞质中,如果出现组织遭到破坏及细胞坏死的情况,便会有大量的天冬氨酸转氨酶出现在细胞外。因此,天冬氨酸转氨酶可作为牙周组织破坏的早期标志物之一。碱性磷酸酶主要参与骨代谢,如果受到一定因素的影响导致牙周组织遭到破坏,牙周膜细胞便会出现破裂,导致碱性磷酸酶水平的显著上升。

背景:有研究发现,将纳米羟基磷灰石与光固化树脂基质制备成复合材料,其压缩强度和挠曲强度能够达到牙科修复材料的要求。
目的:检测纳米羟基磷灰石复合树脂材料的细胞毒性,分析其修复牙体缺损的效果。
方法:①体外实验:采用10%、50%、100%浓度的纳米羟基磷灰石复合树脂材料浸提液分别培养第5代牙周膜成纤维样细胞与L-929细胞,以新鲜细胞维持液的为阴性对照,培养7 d内检测细胞增殖A值。②体内修复试验:选择57例牙体缺损患者,其中男37例,女20例,年龄15-31岁,均采用纳米羟基磷灰石复合树脂材料进行修复,修复后随访3年,检查修复体完整性、边缘适合性、颜色匹配情况,以及牙周探诊深度、龈沟出血指数、牙齿松动度、菌斑指数、龈沟液量、天冬氨酸转氨酶水平等。
结果与结论:①体外实验:不同浓度纳米羟基磷灰石复合树脂材料浸提液对牙周膜成纤维样细胞与L-929细胞的增殖均无影响;②体内修复试验:修复后随访3年,患者牙周探诊深度、龈沟出血指数、牙齿松动度、菌斑指数、龈沟液量、天冬氨酸转氨酶水平较修复前显著下降(P < 0.05),碱性磷酸酶水平未出现明显改变(P > 0.05);出现修复体不完整3例,颜色不匹配4例,边缘不适合3例;③结果表明:纳米羟基磷灰石复合树脂材料无细胞毒性,修复牙体缺损可维持良好的牙周健康状态,具有良好的生物相容性。

关键词: 生物材料, 纳米材料, 纳米羟基磷灰石, 复合树脂, 牙体修复, 细胞毒性, 生物相容性, 应用价值

Abstract:

BACKGROUND: It has been found that the compressive strength and flexural strength of nano- hydroxyapatite combined with light-cured resin matrix can neet the requirements of dental restorative materials.
OBJECTIVE: To detect the cytotoxicity of nano-hydroxyapatite/composite resin, and to analyze its effects on the dental restoration.
METHODS: In vitro test: passage 5 periodontal ligament fibroblast-like cells and L-929 cells suspensions were cultured in the 10%, 50%, 100% of nano-hydroxyapatite/composite resin extracts, respectively, and fresh maintenance medium functioned as negative control group. Absorbance values were detected within 7-day culture. In vivo repair test: 57 cases with tooth defect were enrolled containing 37 males and 20 females aged from 15 to 31 years old, and all were subjected to nano-hydroxyapatite/composite resin treatment. A 3-year follow-up was undergone to detect the completeness, marginal adaptation and color matching of the restoration, as well as the periodontal probing depth, sulcus bleeding index, tooth mobility, dental plaque index, gingival crevicular fluid and aspartate aminotransferase level.
RESULTS AND CONCLUSION: In vitro test results showed that the different concentrations of nano- hydroxyapatite/composite resin extracts had no effects on both periodontal ligament fibroblast-like cells and L-929 cells. In vivo repair test results found that after 3 years of follow-up, the periodontal probing depth, sulcus bleeding index, tooth mobility, dental plaque index, gingival crevicular fluid and aspartate aminotransferase level of patients were significantly decreased than those before repair (P < 0.05), but the alkaline phosphatase level revealed no significant change (P > 0.05). Unfortunately, three cases with incomplete restoration, four cases with color mismatching, and three cases with the inadaptable edge occurred. To conclude, the nano-hydroxyapatite/composite resin holds good biocompatibility and no cytotoxicity, which can maintain a good periodontal health condition in the dental restoration.

Key words: Hydroxyapatites, Composite Resins, Tissue Engineering

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