Mechanical and thermal properties of polyamide versus reinforced PMMA denture base materials.
Mechanical and thermal properties of polyamide versus reinforced PMMA denture base materials.
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DOI：
10.4047/jap.2013.5.2.153
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
Boztug A
中科院分区：
文献类型：
--
作者：
Soygun K;Bolayir G;Boztug A
本研究旨在研究Valplast和添加不同美观纤维(E-Glass、尼龙6或尼龙6.6)的聚甲基丙烯酸甲酯义齿基托树脂的力学和热性能。实验分为5组：对照组(PMMA)、PMMA-E玻璃、PMMA-尼龙6、PMMA-尼龙6.6和Valplast树脂。对于横向强度试验，试件按照ANSI/ADA规范第12号制备，而对于冲击试验，使用ASTM D-256标准。为了评估横向强度的特性，使用三点弯曲(n=7)测试仪器(Lloyd NK5，Lloyd Instruments Ltd，Fareham Hampshire，UK)，速度为5 mm/min。冲击强度采用Dynatup 9250 HV(Instron，UK)装置(n=7)。使用热机械分析(岛津TMA 50，日本岛津)对所有树脂样品进行测试。数据分析采用Kruskal-Wallis和Tukey检验，组间比较达到0.05的显著水平。在所有力学测试中，Valplast组最高(横向强度：117.22±37.8 Mpa，最大挠度：27.55±1.48 mm，冲击强度：0.76±0.03kN)。通过检查热机械分析数据，发现对照样品的E值为8.08 Mpa，高于所有其他样品的E值。Valplast义齿材料虽然具有良好的机械强度，但其弹性模量不够高，不能满足PMMA材料的要求。
This in vitro study intended to investigate the mechanical and thermal characteristics of Valplast, and of polymethyl methacrylate denture base resin in which different esthetic fibers (E-glass, nylon 6 or nylon 6.6) were added. Five groups were formed: control (PMMA), PMMA-E glass, PMMA-nylon 6, PMMA-nylon 6.6 and Valplast resin. For the transverse strength test the specimens were prepared in accordance with ANSI/ADA specification No.12, and for the impact test ASTM D-256 standard were used. With the intent to evaluate the properties of transverse strength, the three-point bending (n=7) test instrument (Lloyd NK5, Lloyd Instruments Ltd, Fareham Hampshire, UK) was used at 5 mm/min. A Dynatup 9250 HV (Instron, UK) device was employed for the impact strength (n=7). All of the resin samples were tested by using thermo-mechanical analysis (Shimadzu TMA 50, Shimadzu, Japan). The data were analyzed by Kruskal-Wallis and Tukey tests for pairwise comparisons of the groups at the 0.05 level of significance. In all mechanical tests, the highest values were observed in Valplast group (transverse strength: 117.22 ± 37.80 MPa, maximum deflection: 27.55 ± 1.48 mm, impact strength: 0.76 ± 0.03 kN). Upon examining the thermo-mechanical analysis data, it was seen that the E value of the control sample was 8.08 MPa, higher than that of the all other samples. Although Valplast denture material has good mechanical strength, its elastic modulus is not high enough to meet the standard of PMMA materials.
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影响因子：
4.6
作者：
John, J;Gangadhar, SA;Shah, I
通讯作者：
Shah, I
影响因子：
4.6
作者：
Stipho, HD
通讯作者：
Stipho, HD
影响因子：
2.5
作者：
Nakamura, Miho;Takahashi, Hidekazu;Hayakawa, Iwao
通讯作者：
Hayakawa, Iwao
DOI：
10.1111/j.1532-849x.2004.04002.x
发表时间：
2004-03-01
期刊：
Journal of prosthodontics : official journal of the American College of Prosthodontists
影响因子：
--
作者：
Phoenix, Rodney D;Mansueto, Michael A;Jones, Robert E
通讯作者：
Jones, Robert E
影响因子：
5
作者：
VALLITTU, PK;LASSILA, VP;LAPPALAINEN, R
通讯作者：
LAPPALAINEN, R