Khanna Manisha, Sehgal Komal, Singla Shefali, Kumar Virender
Department of Prosthodontics and Crown & Bridge, Dr. Harvansh Singh Judge Institute of Dental Sciences and Hospital, Panjab University, ChandigarhIndia.
J Oral Maxillofac Res. 2024 Mar 31;15(1):e4. doi: 10.5037/jomr.2024.15104. eCollection 2024 Jan-Mar.
The purpose of this comparative study was to evaluate the effect of organic and inorganic nanoparticles on colour stability, tear strength and hardness of maxillofacial silicone elastomer at baseline and when subjected to outdoor weathering for 6 months.
A total of 240 specimens were fabricated using M511 platinum silicone which were divided into total 4 groups (n = 60) based on the type of nanoparticles (control, polytetrafuoroethylene [PTFE], titanium dioxide [TiO], zinc oxide [ZnO]) added and each group was further divided into 3 subgroups (n = 20) for colour, tear strength (TS) and hardness (H) testing. The tests were conducted and data was obtained both before and after outdoor weathering of 6 months.
Minimum colour change after weathering was observed in PTFE group (∆E = 2.23). TiO group showed maximum TS (12.01 N/mm) followed by PTFE group (10.85 N/mm) before weathering. After weathering, maximum TS was shown by TiO group (12.9 N/mm) and PTFE group (12.54 N/mm). TiO group showed maximum hardness (24.15 shore A) before weathering and PTFE group showed maximum hardness (33.43 shore A) after weathering.
Within the limitations of this study, it can be concluded that the addition of polytetrafuoroethylene nanoparticles to the polymer enhances both the optical as well as mechanical properties and can be considered favourable for the extended life of the prosthesis.
本比较研究的目的是评估有机和无机纳米颗粒对颌面硅橡胶在基线时以及在户外暴露6个月后的颜色稳定性、撕裂强度和硬度的影响。
使用M511铂硅橡胶制作了总共240个样本，根据添加的纳米颗粒类型（对照组、聚四氟乙烯[PTFE]、二氧化钛[TiO]、氧化锌[ZnO]）分为4组（每组n = 60），每组再进一步分为3个亚组（每组n = 20）进行颜色、撕裂强度（TS）和硬度（H）测试。在6个月的户外暴露前后均进行了测试并获取了数据。
PTFE组在老化后的颜色变化最小（∆E = 2.23）。TiO组在老化前的撕裂强度最大（12.01 N/mm），其次是PTFE组（10.85 N/mm）。老化后，TiO组的撕裂强度最大（12.9 N/mm），PTFE组为（12.54 N/mm）。TiO组在老化前的硬度最大（24.15邵氏A），PTFE组在老化后的硬度最大（33.43邵氏A）。
在本研究的局限性范围内，可以得出结论，向聚合物中添加聚四氟乙烯纳米颗粒可增强光学和机械性能，并且可认为有利于延长假体的使用寿命。
