Effects of post-curing conditions on mechanical properties of 3D printed clear dental aligners
Effects of post-curing conditions on mechanical properties of 3D printed clear dental aligners
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DOI：
10.1108/rpj-04-2019-0118
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发表时间：
2020-06-17
影响因子：
3.9
通讯作者：
Breedon, Philip
中科院分区：
文献类型：
--
作者：
Jindal, Prashant;Juneja, Mamta;Breedon, Philip
3D打印技术已广泛用于制造各种牙科应用的复杂部件。为了获得合适的机械强度，后固化处理是必要的，其中还需要定义相对持续时间和温度规格。本研究/论文的目的是评估后固化条件和3D打印透明牙齿矫正器的机械性能的影响设计/方法/方法牙科长期透明树脂材料已用于使用Formlabs 3D打印机直接用于患者的牙齿矫正器的3D打印。后固化条件已经改变，所有这些都经受1，000 N的机械压缩载荷，以评估固化对矫正器的机械强度的影响。实验研究提供了对温度和持续时间的重要见解，可以为3D打印的透明牙齿矫正器提供足够的压缩机械强度。观察到未固化的矫正器在负载条件下塑性变形，具有大的变形，而在400 ° C-800 ° C之间固化15-20分钟的矫正器在安全地承受495 N和666 N之间的较高压缩负载之后在破碎成碎片之前弹性变形。与未固化的矫正器相比，固化的矫正器的压缩模量比在4.46和5.90之间。对于较短的固化持续时间和较低的温度条件，也实现了适当提高的压缩强度。独创性/价值基于牙科医生的初步评估，合适的定制明确的校准器可以设计，打印和固化到所需的水平，根据患者的要求。这可能会节省时间、能源和单位生产成本，最终将有助于减轻医疗服务机构及其患者的经济负担。
Purpose 3D printing techniques have been widely used for manufacturing complex parts for various dental applications. For achieving suitable mechanical strength, post-cure processing is necessary, where the relative time duration and temperature specification also needs to be defined. The purpose of this study/paper is to assess the effects of post curing conditions and mechanical properties of 3D printed clear dental aligners Design/methodology/approach Dental long-term clear resin material has been used for 3D printing of dental aligners using a Formlabs 3D printer for direct usage on patients. Post-curing conditions have been varied, all of which have been subjected to mechanical compression loading of 1,000 N to evaluate the curing effects on the mechanical strength of the aligners. Findings The experimental studies provide significant insight into both temperatures and time durations that could provide sufficient compressive mechanical strength to the 3D printed clear dental aligners. It was observed that uncured aligners deformed plastically with large deformations under the loading conditions, whereas aligners cured between 400 degrees C-800 degrees C for 15-20 min deformed elastically before fragmenting into pieces after safely sustaining higher compressive loads between 495 N and 666 N. The compressive modulus ratio for cured aligners ranged between 4.46 and 5.90 as compared to uncured aligners. For shorter cure time durations and lower temperature conditions, an appropriate elevated compressive strength was also achieved. Originality/value Based on initial assessments by dental surgeons, suitable customised clear aligners can be designed, printed and cured to the desired levels based on patient's requirements. This could result in time, energy and unit production cost savings, which ultimately would help to alleviate the financial burden placed on both the health service and their patients.