New method to differentiate surface damping behavior and stress absorption capacities of common CAD/CAM restorative materials

Niem, Thomas; Gonschorek, S.; Wöstmann, Bernd

doi:10.1016/j.dental.2020.12.012

Cited by 8 publications

(10 citation statements)

References 88 publications

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“…Hence, the only way for ceramic CRMs to cope with potential excessive stresses is to elastically (VB: 97.5% = 975/1000 × 100; Figure 4 ) transfer this impact energy to the surrounding structures. These structures then have to be able to cope with this challenge or self-destruct, as previously demonstrated by VB [ 21 ] and clinically observed on zirconia implants [ 38 ] restored with single crowns made of feldspathic ceramics [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, the amount of energy that was logically lost (converted and dissipated) on the material surface and not possible to recover was simply deduced from HLD by means of subtracting HLD values from 1000. As previously explained [ 21 ], the respective results were defined as HLD dis in this publication to describe energy dissipation effects:

…”

Section: Methodsmentioning

confidence: 99%

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Investigation of the Damping Capabilities of Different Resin-Based CAD/CAM Restorative Materials

2022

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The aim of the present study was to evaluate and quantify the damping properties of common resin-based computer-aided design and computer-aided manufacturing (CAD/CAM) restorative materials (CRMs) and assess their energy dissipation abilities. Leeb hardness (HLD), together with its deduced energy dissipation data (HLDdis), and loss tangent values recorded via dynamic mechanical analysis (DMA) were determined for six polymer, four composite, and one ceramic CRM as well as one metal. Data were statistically analyzed. Among resin-based CRMs, the significantly highest HLDdis data were detected for the fiber-reinforced composite FD (p < 0.001) directly followed by the filler-reinforced Ambarino High Class (p < 0.001). The significantly lowest HLDdis values were observed for the polymer-based CRM Telio CAD (p < 0.001). For loss tangent, both PEEK materials showed the significantly lowest data and the polymer-based M-PM the highest results with all composite CRMs in between. HLDdis data, which simultaneously record the energy dissipation mechanism of plastic material deformation, more precisely characterize the damping behavior of resin-based CRMs compared to loss tangent results that merely describe viscoelastic material behavior. Depending on material composition, resin-based CRMs reveal extremely different ratios of viscoelastic damping but frequently show enhanced HLDdis values because of plastic material deformation. Future developments in CAD/CAM restorative technology should focus on developing improved viscoelastic damping effects.

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Section: Discussionmentioning

confidence: 99%

…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Damping Capabilities of Different Resin-Based CAD/CAM Restorative Materials

2022

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“…All indentations were conducted under ambient laboratory conditions (23 ± 1 °C; 50 ± 5% relative humidity) on dry specimen surfaces with the device-specific impact body and its indentation ball (tungsten carbide; 1500 HV) ( Figure 1 ). Before measurements were performed on specimen surfaces, the device accuracy was carefully controlled as recommended by the manufacturer [ 19 ] and as previously described [ 11 ]. The calculated mean exhibited a maximum deviation of 7 HLD units (0.93%) when compared to the certified value specified on the reference block.…”

Section: Methodsmentioning

confidence: 99%

“…HLD of the restorative materials was unequivocally determined by centrical positioning on the calibration test block, which was placed on a 10 mm thick granite plate. The indentation process was carried out as previously described [ 11 ]. Five indentations were performed on the same specimen surface, with the arrangement very closely resembling a five depicted on dice to ensure the required distances specified in the ISO standard [ 19 ].…”

Section: Methodsmentioning

confidence: 99%

“…Next, the question arises as to whether commonly determined mechanical properties such as flexural strength, Young’s modulus, fracture toughness, surface hardness, and abrasion resistance [ 9 ] adequately allow a selection of suitable restorative materials with appropriate energy dissipation effects and damping characteristics. We recently reported three useful methods to assess the damping properties of computer-aided design and computer-aided manufacturing (CAD/CAM) materials where the modulus of toughness (MT) values [ 10 ], Leeb hardness data (HLD) together with its deduced energy dissipation results (HLD dis ) [ 11 , 12 , 13 ], as well as the instrumented indentation testing (IIT) together with its elastic (η IT ) and plastic (η ITdis ) index [ 11 ] were determined. All three methods are highly suitable for damping assessment in the present investigation.…”

Section: Introductionmentioning

confidence: 99%

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Damping Behaviour and Mechanical Properties of Restorative Materials for Primary Teeth

et al. 2022

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The energy dissipation capacity and damping ability of restorative materials used to restore deciduous teeth were assessed compared to common mechanical properties. Mechanical properties (flexural strength, modulus of elasticity, modulus of toughness) for Compoglass F, Dyract eXtra, SDR flow, Tetric Evo Ceram, Tetric Evo Ceram Bulk Fill, and Venus Diamond were determined using a 4-point bending test. Vickers hardness and Martens hardness, together with its plastic index (ηITdis), were recorded using instrumented indentation testing. Leeb hardness (HLD) and its deduced energy dissipation data (HLDdis) were likewise determined. The reliability of materials was assessed using Weibull analysis. For common mechanical properties, Venus Diamond always exhibited the significantly highest results and SDR flow the lowest, except for flexural strength. Independently determined damping parameters (modulus of toughness, HLDdis, ηITdis) invariably disclosed the highest values for SDR flow. Composite materials, including SDR flow, showed markedly higher reliabilities (Weibull modulus) than Compoglass F and Dyract eXtra. SDR flow showed pronounced energy dissipation and damping characteristics, making it the most promising material for a biomimetic restoration of viscoelastic dentin structures in deciduous teeth. Future developments in composite technology should implement improved resin structures that facilitate damping effects in artificial restorative materials.

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Effects of storage and toothbrush simulation on Martens hardness of CAD/CAM, hand-cast, thermoforming, and 3D-printed splint materials

Rosentritt,

Hickl,

Rauch

et al. 2023

Clin Oral Invest

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Objectives To investigate Martens hardness parameters of splint materials after storage in liquids and toothbrush simulation. Materials and methods Ten specimens per material and group were fabricated (hand-cast CAST, thermoformed TF, CAD/CAM-milled CAM, 3D-printed PS, PL, PK, PV), stored in air, water, coffee, red wine, and cleaning tablets and investigated after fabrication, 24 h, 2- and 4-week storage or toothbrushing. Martens hardness (HM), indentation hardness (HIT), indentation modulus (EIT), the elastic part of indentation work (ηIT), and indentation creep (CIT) were calculated (ISO 14577-1). Statistics: ANOVA, Bonferroni post hoc test, between-subjects effects, Pearson correlation (α = 0.05). Results HM varied between 30.8 N/mm2 for PS (water 4 weeks) and 164.0 N/mm2 for CAM (toothbrush). HIT values between 34.9 N/mm2 for PS (water 4 weeks) and 238.9 N/mm2 for CAM (toothbrush) were found. EIT varied between 4.3 kN/mm2 for CAM (toothbrush) and 1.8 kN/mm2 for PK (water 2 weeks). ηIT was found to vary between 16.9% for PS (water 4 weeks) and 42.8% for PL (toothbrush). CIT varied between 2.5% for PL (toothbrush) and 11.4% for PS (water 4 weeks). The highest impact was identified for the material (p ≤ 0.001). Conclusions Storage and toothbrushing influenced Martens parameters. The properties of splints can be influenced by the choice of materials, based on different elastic and viscoelastic parameters. High HM and EIT and low CIT might be beneficial for splint applications. Clinical relevance Martens parameters HM, EIT, and CIT might help to evaluate clinically relevant splint properties such as hardness, elasticity, and creep.

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New method to differentiate surface damping behavior and stress absorption capacities of common CAD/CAM restorative materials

Cited by 8 publications

References 88 publications

Investigation of the Damping Capabilities of Different Resin-Based CAD/CAM Restorative Materials

Investigation of the Damping Capabilities of Different Resin-Based CAD/CAM Restorative Materials

Damping Behaviour and Mechanical Properties of Restorative Materials for Primary Teeth

Effects of storage and toothbrush simulation on Martens hardness of CAD/CAM, hand-cast, thermoforming, and 3D-printed splint materials

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