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David C Watts

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Papers by David C Watts

Research paper thumbnail of Effect of filler particles morphology of resin-composites on cavity packing force for repeated condensation

Dental Materials Journal, 2017

Research paper thumbnail of Influence of curing modes on thermal stability, hardness development and network integrity of dual-cure resin cements

Dental Materials, Dec 1, 2021

Research paper thumbnail of Let there be More Light!

Dental materials : official publication of the Academy of Dental Materials, 2015

Research paper thumbnail of Intracoronal stress transfer through enamel following RBC photopolymerisation: A synchrotron X-ray study

Dental Materials, Oct 1, 2018

Research paper thumbnail of Polymerization shrinkage and shrinkage stress development in ultra-rapid photo-polymerized bulk fill resin composites

Research paper thumbnail of The role of cortical zone level and prosthetic platform angle in dental implant mechanical response: A 3D finite element analysis

Research paper thumbnail of Outcomes of ultra-fast (3 s) photo-cure in a RAFT-modified resin-composite

Research paper thumbnail of Evaluation of bone formation in neonatal mouse calvariae using micro-CT and histomorphometry: an in vitro study

Research paper thumbnail of Bis(4-methyl phenyl)iodonium as an alternative component to diphenyliodonium in camphorquinone-based ternary initiating systems

Research paper thumbnail of Effect of biomimetic mineralization on enamel and dentin: A Raman and EDX analysis

Research paper thumbnail of Adhesive class I restorations in sound molar teeth incorporating combined resin-composite and glass ionomer materials: CAD-FE modeling and analysis

Research paper thumbnail of Antimicrobial photodynamic active biomaterials for periodontal regeneration

Research paper thumbnail of Reporting of light irradiation conditions in 300 laboratory studies of resin-composites

Research paper thumbnail of Modal analysis for implant stability assessment: Sensitivity of this methodology for different implant designs

Dental materials : official publication of the Academy of Dental Materials, Jan 8, 2018

To investigate the influence of implant design on the change in the natural frequency of bone-imp... more To investigate the influence of implant design on the change in the natural frequency of bone-implant system during osseointegration by means of a modal 3D finite element analysis. Six implants were considered. Solid models were obtained by means of reverse engineering techniques. The mandibular bone geometry was built-up from a CT scan dataset through image segmentation. Each implant was virtually implanted in the mandibular bone. Two different models have been considered, differing in the free length of the mandibular branch ('long branch' and 'short branch') in order to simulate the variability of boundary conditions when performing vibrometric analyses. Modal analyses were carried out for each model, and the first three resonance frequencies were assessed with the respective vibration modes. With reference to the 'long branch' model, the first three modes of vibration are whole bone vibration with minimum displacement of the implant relative to bone, with...

Research paper thumbnail of Characterizing surface viscoelastic integrity of ultra-fast photo-polymerized composites: Methods development

Research paper thumbnail of Evaluation of UDMA's potential as a substitute for Bis-GMA in orthodontic adhesives

Dental Materials, Aug 1, 2013

Research paper thumbnail of Tensile properties of orthodontic elastomeric chains

European Journal of Orthodontics, Apr 1, 2004

Research paper thumbnail of Shrinkage strain-rates of dental resin-monomer and composite systems

Biomaterials, Aug 1, 2005

Research paper thumbnail of Orthodontic Bonding to Wet Enamel with Water-Insensitive and Water-Activated Orthodontic Adhesive Resins

Research paper thumbnail of In vitro degradation of polyurethane orthodontic elastomeric modules

Journal of Oral Rehabilitation, 2005

The objectives of this study were to investigate the structural characteristics of orthodontic po... more The objectives of this study were to investigate the structural characteristics of orthodontic polyurethane elastomeric modules and their changes produced by mechanical and chemical ageing. Three products were tested (Generation II, Dentaurum, Alastic). For each product four groups of modules were studied under the following conditions: as-received (A(0)); after 3 weeks stretching at 50% elongation in air (B(0)); after 3 weeks immersion in an ethanol/water solution (3:1 v/v) to induce accelerated ageing (A(1)); and after 3 weeks immersion in the ethanol/water solution at 50% elongation, as above (B(1)). The chains and the solution extracts were characterized by micro-MIR FTIR spectroscopy. Specimens of group B(0) exhibited changes in peak intensities relative to the control group (A(0)), attributed to molecular orientation of poly (methylene glycol) soft segments and chain extenders such as butanediol. Moreover, group B(0) showed differences in the omega(CH(2))b peak at 1364 cm(-1), attributed to oxidative degradation of alpha-methylene groups by formation of ester, carboxylic acid or aldehyde groups due to hydrogen abstraction. Comparison of A(1) and B(1) groups with the controls (A(0), B(0)) showed no major differences between their respective spectra, apart from the loss of the 1639 cm(-1) peak attributed to ethylene NN bis (stearamide) wax. However, comparison of the spectra of the extracts from the elongated modules with the extracts of the controls revealed differences in the concentration of alcohol and alkene groups. The structural changes identified were the same in all the products tested and may indicate degradation mechanisms that could potentially hold intraorally.

Research paper thumbnail of Effect of filler particles morphology of resin-composites on cavity packing force for repeated condensation

Dental Materials Journal, 2017

Research paper thumbnail of Influence of curing modes on thermal stability, hardness development and network integrity of dual-cure resin cements

Dental Materials, Dec 1, 2021

Research paper thumbnail of Let there be More Light!

Dental materials : official publication of the Academy of Dental Materials, 2015

Research paper thumbnail of Intracoronal stress transfer through enamel following RBC photopolymerisation: A synchrotron X-ray study

Dental Materials, Oct 1, 2018

Research paper thumbnail of Polymerization shrinkage and shrinkage stress development in ultra-rapid photo-polymerized bulk fill resin composites

Research paper thumbnail of The role of cortical zone level and prosthetic platform angle in dental implant mechanical response: A 3D finite element analysis

Research paper thumbnail of Outcomes of ultra-fast (3 s) photo-cure in a RAFT-modified resin-composite

Research paper thumbnail of Evaluation of bone formation in neonatal mouse calvariae using micro-CT and histomorphometry: an in vitro study

Research paper thumbnail of Bis(4-methyl phenyl)iodonium as an alternative component to diphenyliodonium in camphorquinone-based ternary initiating systems

Research paper thumbnail of Effect of biomimetic mineralization on enamel and dentin: A Raman and EDX analysis

Research paper thumbnail of Adhesive class I restorations in sound molar teeth incorporating combined resin-composite and glass ionomer materials: CAD-FE modeling and analysis

Research paper thumbnail of Antimicrobial photodynamic active biomaterials for periodontal regeneration

Research paper thumbnail of Reporting of light irradiation conditions in 300 laboratory studies of resin-composites

Research paper thumbnail of Modal analysis for implant stability assessment: Sensitivity of this methodology for different implant designs

Dental materials : official publication of the Academy of Dental Materials, Jan 8, 2018

To investigate the influence of implant design on the change in the natural frequency of bone-imp... more To investigate the influence of implant design on the change in the natural frequency of bone-implant system during osseointegration by means of a modal 3D finite element analysis. Six implants were considered. Solid models were obtained by means of reverse engineering techniques. The mandibular bone geometry was built-up from a CT scan dataset through image segmentation. Each implant was virtually implanted in the mandibular bone. Two different models have been considered, differing in the free length of the mandibular branch ('long branch' and 'short branch') in order to simulate the variability of boundary conditions when performing vibrometric analyses. Modal analyses were carried out for each model, and the first three resonance frequencies were assessed with the respective vibration modes. With reference to the 'long branch' model, the first three modes of vibration are whole bone vibration with minimum displacement of the implant relative to bone, with...

Research paper thumbnail of Characterizing surface viscoelastic integrity of ultra-fast photo-polymerized composites: Methods development

Research paper thumbnail of Evaluation of UDMA's potential as a substitute for Bis-GMA in orthodontic adhesives

Dental Materials, Aug 1, 2013

Research paper thumbnail of Tensile properties of orthodontic elastomeric chains

European Journal of Orthodontics, Apr 1, 2004

Research paper thumbnail of Shrinkage strain-rates of dental resin-monomer and composite systems

Biomaterials, Aug 1, 2005

Research paper thumbnail of Orthodontic Bonding to Wet Enamel with Water-Insensitive and Water-Activated Orthodontic Adhesive Resins

Research paper thumbnail of In vitro degradation of polyurethane orthodontic elastomeric modules

Journal of Oral Rehabilitation, 2005

The objectives of this study were to investigate the structural characteristics of orthodontic po... more The objectives of this study were to investigate the structural characteristics of orthodontic polyurethane elastomeric modules and their changes produced by mechanical and chemical ageing. Three products were tested (Generation II, Dentaurum, Alastic). For each product four groups of modules were studied under the following conditions: as-received (A(0)); after 3 weeks stretching at 50% elongation in air (B(0)); after 3 weeks immersion in an ethanol/water solution (3:1 v/v) to induce accelerated ageing (A(1)); and after 3 weeks immersion in the ethanol/water solution at 50% elongation, as above (B(1)). The chains and the solution extracts were characterized by micro-MIR FTIR spectroscopy. Specimens of group B(0) exhibited changes in peak intensities relative to the control group (A(0)), attributed to molecular orientation of poly (methylene glycol) soft segments and chain extenders such as butanediol. Moreover, group B(0) showed differences in the omega(CH(2))b peak at 1364 cm(-1), attributed to oxidative degradation of alpha-methylene groups by formation of ester, carboxylic acid or aldehyde groups due to hydrogen abstraction. Comparison of A(1) and B(1) groups with the controls (A(0), B(0)) showed no major differences between their respective spectra, apart from the loss of the 1639 cm(-1) peak attributed to ethylene NN bis (stearamide) wax. However, comparison of the spectra of the extracts from the elongated modules with the extracts of the controls revealed differences in the concentration of alcohol and alkene groups. The structural changes identified were the same in all the products tested and may indicate degradation mechanisms that could potentially hold intraorally.

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