Diagenesis-inspired reaction of magnesium ions with surface enamel mineral modifies properties of human teeth

Eimar, Hazem; Bassett, D. C.; Schnabel, Martin; Ciobanu, Ovidiu; Nelea, Valentin; McKee, Marc D.; Cerruti, Marta; Abdallah, Mohamed‐Nur

doi:10.1016/j.actbio.2016.04.005

Cited by 31 publications

(26 citation statements)

References 45 publications

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“…Tooth enamel sections fixed in resin blocks were also analyzed for comparison. 33,34 Nine measurements were obtained per specimen (n 5 3) under indentation load of 500 g for 10 s of dwell time. Computer software (Vision PE 3.5, Clemex Technologies Inc., Shawnee Mission, KS) was used to measure the microhardness value at the site of indentation from images captured by a built-in camera.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Removable partial denture alloys processed by laser‐sintering technique

et al. 2017

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Removable partial dentures (RPDs) are traditionally made using a casting technique. New additive manufacturing processes based on laser sintering has been developed for quick fabrication of RPDs metal frameworks at low cost. The objective of this study was to characterize the mechanical, physical, and biocompatibility properties of RPD cobalt-chromium (Co-Cr) alloys produced by two laser-sintering systems and compare them to those prepared using traditional casting methods. The laser-sintered Co-Cr alloys were processed by the selective laser-sintering method (SLS) and the direct metal laser-sintering (DMLS) method using the Phenix system (L-1) and EOS system (L-2), respectively. L-1 and L-2 techniques were 8 and 3.5 times more precise than the casting (CC) technique (p < 0.05). Co-Cr alloys processed by L-1 and L-2 showed higher (p < 0.05) hardness (14-19%), yield strength (10-13%), and fatigue resistance (71-72%) compared to CC alloys. This was probably due to their smaller grain size and higher microstructural homogeneity. All Co-Cr alloys exhibited low porosity (2.1-3.3%); however, pore distribution was more homogenous in L-1 and L-2 alloys when compared to CC alloys. Both laser-sintered and cast alloys were biocompatible. In conclusion, laser-sintered alloys are more precise and present better mechanical and fatigue properties than cast alloys for RPDs. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1174-1185, 2018.

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Section: Mechanical Characterizationmentioning

confidence: 99%

Removable partial denture alloys processed by laser‐sintering technique

et al. 2017

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“…The etching time was set at 50 s per cycle and was repeated for six cycles. These conditions correspond to an etch rate of 0.28 nm/s on a Ta 2 O 5 sample . Because PDLLA films are less resistant to etching than Ta 2 O 5 ; the expected etching rate would be higher than 0.28 nm/s for PDLLA.…”

Section: Methodsmentioning

confidence: 97%

“…These conditions correspond to an etch rate of 0.28 nm/s on a Ta 2 O 5 sample. 39 Because PDLLA films are less resistant to etching than Ta 2 O 5 ; the expected etching rate would be higher than 0.28 nm/s for PDLLA. Data analysis was performed using the Avantage software (5.41v, Thermo Fisher Scientific Inc., East Grinstead, UK).…”

Section: Compatibility Of the Molding Materials With Pdllamentioning

confidence: 99%

Scaffolds for epithelial tissue engineering customized in elastomeric molds

et al. 2017

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Restoration of soft tissue defects remains a challenge for surgical reconstruction. In this study, we introduce a new approach to fabricate poly(d,l-lactic acid) (PDLLA) scaffolds with anatomical shapes customized to regenerate three-dimensional soft tissue defects. Highly concentrated polymer/salt mixtures were molded in flexible polyether molds. Microcomputed tomography showed that with this approach it was possible to produce scaffolds with clinically acceptable volume ratio maintenance (>90%). Moreover, this technique allowed us to customize the average pore size and pore interconnectivity of the scaffolds by using variations of salt particle size. In addition, this study demonstrated that with the increasing porosity and/or the decreasing of the average pore size of the PDLLA scaffolds, their mechanical properties decrease and they degrade more slowly. Cell culture results showed that PDLLA scaffolds with an average pore size of 100 µm enhance the viability and proliferation rates of human gingival epithelial cells up to 21 days. The simple method proposed in this article can be extended to fabricate porous scaffolds with customizable anatomical shapes and optimal pore structure for epithelial tissue engineering. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 880-890, 2018.

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“…Numerous works [3][4][5][6][7][10][11][12][13][14] are dedicated to the study of properties of biominerals (enamel, bones) and organic poly-Методом електронного парамагнітного резонансу вивчені електропровідні області в біомінералах (емаль зубів, кістки), і в полі-амідних полотнах, що містять наночас-тинки поліаніліну. Встановлено, що харак-теристики електронного парамагнітного резонансу електропровідних нанообластей в біомінералах і текстильних матеріалах, що містять наночастинки поліаніліну, є подібними.…”

Section: Literature Review and Problem Statementunclassified

“…Встановлено, що харак-теристики електронного парамагнітного резонансу електропровідних нанообластей в біомінералах і текстильних матеріалах, що містять наночастинки поліаніліну, є подібними. Це обумовлено схожістю пара-магнітних носіїв заряду, локалізованих в нанорозмірних електропровідних областях біомінералів і органічних полімерів [10], however variation of EPR signals under effect of metal ions of various concentrations on properties of human teeth and bones was not taken in account. Work [6] investigated properties of enamel by the method of optically stimulated luminescence (OSL).…”

Section: Literature Review and Problem Statementunclassified