Shape-Memory Polymers in Dentistry: Systematic Review and Patent Landscape Report

Bruni, Alessandro; Serra, Francesca Giulia; Deregibus, Andrea; Castroflorio, Tommaso

doi:10.3390/ma12142216

Cited by 26 publications

(19 citation statements)

References 60 publications

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“…In other words, the shape memory mechanism in thermal-responsive SMPs is a reversible activation and inactivation of polymer-chain motion in the switching segments respectively above and below certain temperature called transition temperature (T trans ). T trans could be either glass transition temperature (T g ) or melting temperature (T m ) [ 14 , 20 , 35 ]. So, once the T trans is reached, the deformed shape memory material displays an elastic property and return to its original shape; this shape recovery generates forces that may be able to move a tooth [ 36 ].…”

Section: Discussionmentioning

confidence: 99%

“…The aim of many recent interdisciplinary research studies is to introduce novel materials that can play an active role in the appliances [ 14 ]. These materials are called smart materials or stimuli-responsive materials which are able to react suitably with external stimuli, such as thermal, electrical, or magnetic input, producing a predictable repeatable output [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…Together with their relatively transparent and aesthetically satisfactory appearance, they have the advantage over the conventional aligner materials by possessing an intrinsic shape recovery property. Hence, application of SMPs to orthodontics can provide the aligners with considerable self-shape-recovery forces which may facilitate their operability and functionality [ 14 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…After heating above transition temperature (50 °C), the teeth were corrected within one hour on a typodont model. Although there are some patents [ 24 , 25 , 26 ] that propose using smart polymers in fabrication of orthodontic aligners, there are still lack of studies investigating this innovation before being clinically applied [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Primary Evaluation of Shape Recovery of Orthodontic Aligners Fabricated from Shape Memory Polymer (A Typodont Study)

et al. 2021

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As an innovative approach to overcome the rate-limiting staging of conventional aligners, using shape memory polymers (SMPs) as aligners’ materials was investigated in this in vitro study. The ability of SMPs to shape recover and consequently move tooth, upon appropriate stimuli, was evaluated on a typodont model before clinical application. The study design was to achieve 1.9 mm correction movement of an upper central incisor by one aligner after multiple steps/activation. A custom-made aligned typodont model with a movable upper central incisor was scanned. Using an orthodontic software and a 3D printer, resin-models were generated. Seven aligners of ClearX sheets (SMPs) were fabricated by thermoforming on the resin aligned model. Each aligner was tested for repositioning of the central incisor in the typodont model. The model was scanned after each step and the corrective movement was measured through the superimposition of scans. Results showed that the total correction efficiency of the SMPs’ aligner was ≈93% (1.76 mm). The corrective movement was 0.94 ± 0.04 mm after the reforming step, 0.66 ± 0.07 mm after the first activation step, and 0.15 ± 0.10 mm after the second activation step. It was concluded that aligners made of SMPs could have a promising future-use in orthodontic aesthetic treatment.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Primary Evaluation of Shape Recovery of Orthodontic Aligners Fabricated from Shape Memory Polymer (A Typodont Study)

et al. 2021

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“…Recently, due to the functional features, strong development and application of intelligent smart materials (SMs) have been noticeable [1,2]. SMs are defined as materials whose behavior changes in a systematic way [3].…”

Section: Introductionmentioning

confidence: 99%

Application of Smart Materials in the Actuation System of a Gas Injector

et al. 2021

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This paper presents the results of research related to the selection of materials for passive and active components of a three-layer piezoelectric cantilever converter. The transducer is intended for use in a low-pressure gas-phase injector executive system. To ensure the functionality of the injector, its flow characteristics and the effective range of valve opening had to be determined. Therefore, a spatial model of the complete injector was developed, and the necessary flow analyses were performed using computational fluid dynamics (CFD) in Ansys Fluent environment. The opening and closing of the injector valve are controlled by a piezoelectric transducer. Thus, its static electromechanical characteristics were found in analytical form. On this basis, the energy demand of the converter, required to obtain the desired valve opening, was determined. Assuming a constant transducer geometry, 40 variants of material combinations were considered. In the performed analyses, it was assumed that the passive elements of the actuator are made of typical materials used in micro-electromechanical systems (MEMSs) (copper, nickel, silicon alloys and aluminum alloys). As for the active components of the converter, it was assumed that they could be made of polymeric or ceramic piezoelectric materials. On the basis of the performed tests, it was found that the energy demand is most influenced by the relative stiffness of the transducer materials (Young’s modulus ratio) and the piezoelectric constant of the active component (d31). Moreover, it was found that among the tested material combinations, the transducer made of silicon oxide and PTZ5H (soft piezoelectric ceramics) had the lowest energy consumption.

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Facile Green Synthesis of Zingerone Based Tissue‐Like Biodegradable Polyester with Shape‐Memory Features for Regenerative Medicine

Jindal,

Ghosal,

Khamaisi

et al. 2024

Adv Funct Materials

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The abundance of plants as a renewable bioresource has captured the significant attention of researchers, driving them to explore new biodegradable polymeric materials. However, there are still many biobased materials with untapped potential, offering opportunities to synthesize novel biodegradable polymers with multifunctional properties. This work provides a unique solvent and catalyst‐free melt polycondensation process to prepare a series of polyesters using zingerol (Zing‐OH), a reduced form of zingerone, as a primary component for the first time. Briefly, Zing‐OH (a ginger‐based component) is employed in conjunction with a variety of renewable resources, such as citric acid (CA), sebacic acid (SA), and xylitol (Xy), to synthesize multifunctional soft tissue‐like ZCSX polyesters. Fourier‐transform infrared (FTIR) and 1H‐nuclear magnetic resonance (NMR) spectroscopy are used to validate the synthesis of the polyesters, while thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and universal testing machine (UTM) are employed to investigate their physicochemical properties. Moreover, the synthesized polyester's thermal, mechanical, and biodegradation properties can be fine‐tuned by simply varying the Zing‐OH feed ratio. The mechanical properties of the synthesized polymer resemble various human tissues, including the liver, uterus, bladder, breast, and temporal and nasal cartilage. This suggests that the synthesized polyesters can potentially be useful in tissue engineering applications. Furthermore, the polyester demonstrated exceptional recovery responses and good shape memory behavior at ambient body temperature. Additionally, as observed from Alamar blue, live/dead assays, and time‐dependent in vitro wound images, the synthesized polyester demonstrated antibacterial activity, good in vitro cytocompatibility, cell proliferation, and wound healing capabilities against mouse fibroblast cells (NIH/3T3). The developed biocompatible polyester also exhibits excellent hemocompatibility for human blood, indicating its potential use in the field of regenerative medicine.

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Shape-Memory Polymers in Dentistry: Systematic Review and Patent Landscape Report

Cited by 26 publications

References 60 publications

Primary Evaluation of Shape Recovery of Orthodontic Aligners Fabricated from Shape Memory Polymer (A Typodont Study)

Primary Evaluation of Shape Recovery of Orthodontic Aligners Fabricated from Shape Memory Polymer (A Typodont Study)

Application of Smart Materials in the Actuation System of a Gas Injector

Facile Green Synthesis of Zingerone Based Tissue‐Like Biodegradable Polyester with Shape‐Memory Features for Regenerative Medicine

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