Prashant Jindal, Mamta Juneja, Divya Bajaj, Francesco Luke Siena and Philip Breedon
3D printing techniques have been widely used for manufacturing complex parts for various dental applications. For achieving suitable mechanical strength, post-cure processing is…
Abstract
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°C–800°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.
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Philip Summe and Kimberly A. McCoy
Throughout the history of commerce, individuals have searched for informational advantages that will lead to their enrichment. In a time of global capital markets, 24 hours a day…
Abstract
Throughout the history of commerce, individuals have searched for informational advantages that will lead to their enrichment. In a time of global capital markets, 24 hours a day trading opportunities, and a professional services corps of market experts, informational advantages are pursued by virtually every market participant. This paper examines one of the most vilified informational advantages in modern capital markets: insider trading. In the USA during the 1980s, insider trading scandals occupied the front pages of not only the trade papers, but also quotidian tabloids. Assailed for its unfairness and characterised by some as thievery, insider trading incidents increased calls for stricter regulation of the marketplace and its participants. In the aftermath of the spectacular insider trading litigation in the USA in the late 1980s, many foreign states began to re‐evaluate the effectiveness of their own regulatory structures. In large part, this reassessment was not the produce of domestic demand, but constituted a response to American agitation for increased regulation of insider trading.
Claims as property modelling and forecasting techniques have developed to take account of new investment theories, property researchers have tended to follow the approach of…
Abstract
Claims as property modelling and forecasting techniques have developed to take account of new investment theories, property researchers have tended to follow the approach of modern portfolio theory and, sometimes, the capital asset pricing model (CAPM). Argues that one of the reasons why property is often not included in actuarial property forecasting models for the purpose of asset allocation (which is a widespread perception in the property industry) is because actuaries have not made clear to property researchers the forms of their models, which are often quite different from those used in others parts of the finance literature. Explains how traditional investment theory can be adapted for actuarial use and how actuaries use forecasting models in asset allocation. Areas of property research which would assist actuaries develop better property forecasting models are identified.
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Mary Weir and Jim Hughes
Introduction Consider a hi‐fi loudspeaker manufacturing company acquired on the brink of insolvency by an American multinational. The new owners discover with growing concern that…
Abstract
Introduction Consider a hi‐fi loudspeaker manufacturing company acquired on the brink of insolvency by an American multinational. The new owners discover with growing concern that the product range is obsolete, that manufacturing facilities are totally inadequate and that there is a complete absence of any real management substance or structure. They decide on the need to relocate urgently so as to provide continuity of supply at the very high — a market about to shrink at a rate unprecedented in its history.