牙本质与复合树脂压缩蠕变行为匹配性的实验研究

doi:10.3877/cma.j.issn.1674-1366.2017.01.003

中华口腔医学研究杂志(电子版) ›› 2017, Vol. 11 ›› Issue (01) : 12 -16. doi: 10.3877/cma.j.issn.1674-1366.2017.01.003

所属专题：文献；

基础研究

牙本质与复合树脂压缩蠕变行为匹配性的实验研究

张天漪¹, 李湘霞¹, 简裕涛², 张新平³, 赵克¹^,^†(

)

^1. 510055　广州，中山大学光华口腔医学院·附属口腔医院，广东省口腔医学重点实验室；510080　广州，广东省牙颌系统修复重建技术与材料工程技术研究中心
^2. 510055　广州，中山大学光华口腔医学院·附属口腔医院，广东省口腔医学重点实验室
^3. 510640　广州，华南理工大学材料科学与工程学院

收稿日期:2016-10-17 出版日期:2017-02-01
通信作者: 赵克
基金资助:
国家自然科学基金(81470767)

Suitability between human dentine and resin-composite′s compressive creep behaviour: an in vitro study

Tianyi Zhang¹, Xiangxia Li¹, Yutao Jian², Xinping Zhang³, Ke Zhao¹^,^†()

^1. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China; Guangdong Engineering Research Center of Technology and Materials for Oral Restoration and Reconstruction, Guangzhou 510080, China
^2. Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
^3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Received:2016-10-17 Published:2017-02-01
Corresponding author: Ke Zhao
About author:
Corresponding author: Zhao Ke, Email: zhaoke@mail.sysu.edu.cn

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引用本文：

张天漪, 李湘霞, 简裕涛, 张新平, 赵克. 牙本质与复合树脂压缩蠕变行为匹配性的实验研究[J/OL]. 中华口腔医学研究杂志(电子版), 2017, 11(01): 12-16.

Tianyi Zhang, Xiangxia Li, Yutao Jian, Xinping Zhang, Ke Zhao. Suitability between human dentine and resin-composite′s compressive creep behaviour: an in vitro study[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2017, 11(01): 12-16.

目的

研究人牙本质与复合树脂在相同实验条件下蠕变行为的匹配性。

方法

收集离体人磨牙切削制作圆柱体形态的牙本质试件20个，采用随机数表法随机分为D300与D50两组，每组10个试件。制作圆柱形复合树脂试件20个，采用随机数表法随机分为R300与R50组两组，每组10个。分别对D300与R300组的试件施加300 N载荷、D50与R50组施加50 N载荷至7200 s，每5秒记录1次应变，绘制应变-时间曲线并提取最大蠕变应变，使用两独立样本的t检验进行组间比较，检验水准为双侧α= 0.05。

结果

牙本质与复合树脂在实验条件下均表现出一定的蠕变行为，且蠕变曲线形态有差异。300 N载荷下牙本质最大蠕变应变为（2.953 ± 1.099）%，复合树脂最大蠕变应变为（1.370 ± 0.069）%，二者差异具有统计学意义（t= 4.54，P < 0.001）；50 N载荷下牙本质最大蠕变应变为（1.490 ± 0.348）%，复合树脂最大蠕变应变为（0.483 ± 0.105）%，二者差异具有统计学意义（t= 8.76，P < 0.001）。

结论

相同实验条件下，相同载荷时牙本质蠕变较复合树脂蠕变明显。

关键词: 牙本质, 复合树脂类, 压缩蠕变

Objective

To evaluate the suitability between human dentine and resin-composite′s compressive creep behavior under in vitro circumstances.

Methods

Twenty human dentine specimens were fabricated using molars free from fracture and irregularities in shape, and were then divided randomly into two groups, with ten specimens in each group. Twenty resin-composite specimens were prepared in a dental laboratory and divided randomly into two groups, with ten specimens in each group. Specimens were loaded for 7200 s under a constant compressive load of 300 and 50 N, respectively. After the data acquisition of compressive creep tests, the time-strain curves were drawn and the maximum creep strain was observed. Statistical analysis was performed using independent-samples t-test at a significance level of 0.05.

Results

Under the same in vitro testing conditions, creep behaviour was observed in both human dentine and resin-composite, yet the trend of the strain-time curves was different. Under the constant load of 300 N, the maximum creep strain of human dentine was (2.953 ± 1.099) %, significantly higher than that of the resin-composite (1.370 ± 0.069) % (t= 4.54, P < 0.001) . Under the constant load of 50 N, the maximum creep strain of dentine was (1.490 ± 0.348) %, significantly higher than that of the resin-composite (0.483 ± 0.105) % (t= 8.76, P < 0.001) .

Conclusion

Under the same in vitro testing conditions, the compressive creep occurred in human dentine was significantly higher than that in resin-composite.

Key words: Dentine, Resin-composites, Compressive creep behavior

表1 不同载荷下牙本质与复合树脂压缩蠕变测定结果（%）

组别	试件数	最大蠕变应变(±s)	组内最大值	组内最小值
D300组	10	2.953 ± 1.099	5.413	1.722
D50组	10	1.490 ± 0.348	2.107	1.061
R300组	10	1.370 ± 0.069	1.473	1.283
R50组	10	0.483 ± 0.105	0.683	0.301

表1 不同载荷下牙本质与复合树脂压缩蠕变测定结果（%）

组别	试件数	最大蠕变应变(±s)	组内最大值	组内最小值
D300组	10	2.953 ± 1.099	5.413	1.722
D50组	10	1.490 ± 0.348	2.107	1.061
R300组	10	1.370 ± 0.069	1.473	1.283
R50组	10	0.483 ± 0.105	0.683	0.301

图1 不同载荷下牙本质、复合树脂压缩蠕变应变-时间曲线

图2 汇总后不同载荷下牙本质与复合树脂的平均压缩蠕变应变-时间曲线

图3 典型的蠕变应变-时间曲线示意图^[8]

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