Richard Price - Academia.edu (original) (raw)
Papers by Richard Price
PLOS ONE
Background Given the increasing use of photo-activated resins in dentistry, dentists and research... more Background Given the increasing use of photo-activated resins in dentistry, dentists and researchers need a user-friendly dental radiometer to measure the power output from dental light-curing units (LCUs). Objective Our goal was to measure the accuracy of two brands of dental radiometers in reporting the power (mW) from twelve brands of contemporary LCUs compared to a ‘gold standard’ (GS) reference value obtained from an integrating sphere attached to a fiberoptic spectroradiometer. Methods The power output was measured from two units of 12 brands of LCUs, five times on the ‘‘GS” system, five times on two Bluephase Meter II dental radiometers, and five times on two Mini Gig hand-held spectroradiometers. The emission spectrum was also recorded using the ‘GS’ integrating sphere. The power values reported by each meter were subjected to t-tests to compare the two examples of each LCU, and 3-way ANOVA followed by Bonferroni’s post-hoc tests. Regression analyses were also performed to d...
Bookmarks Related papers MentionsView impact
The Journal of the American Dental Association, 2019
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2017
SUMMARY Purpose: This study examined the influence of different emission spectra (single-peak and... more SUMMARY Purpose: This study examined the influence of different emission spectra (single-peak and broad-spectrum) light-curing units (LCUs) delivering the same radiant exposures at irradiance values of 1200 or 3600 mW/cm2 on the polymerization and light transmission of four resin-based composites (RBCs). Methods and Materials: Two prototype LCUs that used the same light tip, but were either a single-peak blue or a broad-spectrum LED, were used to deliver the same radiant exposures to the top surfaces of the RBCs using either standard (1200 mW/cm2) or high irradiance (3600 mW/cm2) settings. The emission spectrum and radiant power from the LCUs were measured with a laboratory-grade integrating sphere coupled to a spectrometer, and the light beam was assessed with a beam profiler camera. Four RBCs (Filtek Supreme Ultra A2, Tetric EvoCeram A2, Tetric EvoCeram T, and TPH Spectra High Viscosity A2) were photoactivated using four different light conditions: single-peak blue/standard irradi...
Bookmarks Related papers MentionsView impact
European Journal of General Dentistry
Objectives The manufacturers of budget light-curing units (LCUs) often claim to provide high-qual... more Objectives The manufacturers of budget light-curing units (LCUs) often claim to provide high-quality units that are equivalent to LCUs from major manufacturers. This study investigated the effects of battery discharge on the light output from different budget LCUs compared to a major manufacturer. Materials and Methods Two brands of budget LCUs (LY-A180 and LED-CL) were compared to a control LCU from a major manufacturer (3M). The LCUs were fully charged, and their light outputs were measured over one battery discharge cycle using repeated 10-second exposures at a 0-mm distance. Statistical Analysis Data were analyzed using one-way analysis of variance and Bonferroni post-hoc test. Results The budget LCUs delivered fluctuating light output values. In their first exposure, the budget LCUs delivered between 205 and 444 mW power, an irradiance between 533 and 1154 mW/cm2, and a radiant exposure between 5.3 and 11.5 J/cm2. As the number of exposures increased, their light output decreas...
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2018
SUMMARY Objective: To evaluate the effects of different mold materials, their diameters, and ligh... more SUMMARY Objective: To evaluate the effects of different mold materials, their diameters, and light-curing units on the mechanical properties of three resin-based composites (RBC). Methods and Materials: A conventional nano-filled resin composite (Filtek Supreme Ultra, 3M Oral Care, St Paul, MN, USA) and two bulk-fill composites materials, Tetric Evoceram Bulk fill (Ivoclar Vivadent, Schaan, Liechtenstein) and Aura Bulk Fill (SDI, Bayswater, VIC, Australia), were tested. A total of 240 specimens were fabricated using metal or white semitransparent Delrin molds that were 4 or 10 mm in diameter. The RBCs were light cured for 40 seconds on the high-power setting of either a monowave (DeepCure-S, 3M Oral Care) or polywave (Bluephase G2, Ivoclar Vivadent) light-emitting diode (LED) curing unit. The depth of cure was determined using a scraping test, according to the 2009 ISO 4049 test method. Data were analyzed using multivariate analysis of variance followed by Tukey multiple comparison ...
Bookmarks Related papers MentionsView impact
International Endodontic Journal, 2009
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2016
SUMMARY Recently, “budget” dental light-emitting diode (LED)–based light-curing units (LCUs) have... more SUMMARY Recently, “budget” dental light-emitting diode (LED)–based light-curing units (LCUs) have become available over the Internet. These LCUs claim equal features and performance compared to LCUs from major manufacturers, but at a lower cost. This study examined radiant power, spectral emission, beam irradiance profiles, effective emission ratios, and the ability of LCUs to provide sustained output values during the lifetime of a single, fully charged battery. Three examples of each budget LCU were purchased over the Internet (KY-L029A and KY-L036A, Foshan Keyuan Medical Equipment Co, and the Woodpecker LED.B, Guilin Woodpecker Medical Instrument Co). Major dental manufacturers provided three models: Elipar S10 and Paradigm (3M ESPE) and the Bluephase G2 (Ivoclar Vivadent). Radiant power emissions were measured using a laboratory-grade thermopile system, and the spectral emission was captured using a spectroradiometer system. Irradiance profiles at the tip end were measured using...
Bookmarks Related papers MentionsView impact
The International journal of prosthodontics, 2021
PURPOSE To evaluate the effect of tooth brushing and dentifrice fluoride (F-) concentration on ch... more PURPOSE To evaluate the effect of tooth brushing and dentifrice fluoride (F-) concentration on changes in color and translucency (ΔE00 and ΔT00, respectively), surface gloss (GS), surface roughness (Sa), and microstructure of a glazed CAD/CAM ceramic. MATERIALS AND METHODS Ceramic blocks (e.max/CAD) were sectioned into rectangular plates (14 x 12 x 1 mm), and one surface of each sample was glazed. Samples were divided into three groups according to the F- concentration in the dentifrice (0, 1,100, and 5,000 μg/g) and were then subjected to 60,000 tooth brushing cycles. Luminosity and color were measured using a spectrophotometer at baseline and after every 20,000 cycles to obtain their ΔE00 and ΔT00 values. Another set of samples was prepared to measure the GS with a gloss meter and the Sa with a confocal laser microscope. The GS and Sa results were subjected to analysis of variance, Tukey test, and Dunnett test (α = .05). RESULTS After 60,000 tooth brushing cycles, all of the varia...
Bookmarks Related papers MentionsView impact
Iranian Endodontic Journal, 2014
Introduction: The aim of this descriptive cross-sectional study was to assess the general dental ... more Introduction: The aim of this descriptive cross-sectional study was to assess the general dental practitioners (GDPs)’s knowledge regarding the emergency management of traumatic dental injuries (TDI) in Isfahan, Iran. Methods and Materials: In this study a two-part questionnaire consisting of 14 questions was distributed among 241 GDPs. Part 1 included seven questions focusing on personal and professional information and part 2 asked questions about seven given cases of dental traumas. One score was dedicated to each correct answer; the total score of 0 to 4 was considered as poor knowledge, while scores 5-8, 9-11 and 12-14 were assigned as moderate, good and excellent knowledge, respectively. The data were analyzed using the Student’s t-test and one-way ANOVA. Spearman’s and Pearson’s correlation coefficient were used to determine the associations between the emergency treatment knowledge and dentists’ professional information. Results: With regards to the level of GDP’s knowledge,...
Bookmarks Related papers MentionsView impact
Dental Materials, 2018
Bookmarks Related papers MentionsView impact
Operative dentistry
Bookmarks Related papers MentionsView impact
British Dental Journal, 1996
Bookmarks Related papers MentionsView impact
The Journal of the American Dental Association
The perils of online purchasing ... ( https://authors.elsevier.com/a/1edif\_46QxGnd )
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2018
SUMMARY Objectives: This study compared light transmission through different thicknesses of bulk-... more SUMMARY Objectives: This study compared light transmission through different thicknesses of bulk-fill resin-based composites (RBCs) using a polywave and a single-peak light-emitting diode light-curing unit (LCU). The effect on the surface hardness was also evaluated. Methods: Five bulk-fill RBCs were tested. Specimens (n=5) of 1-, 2-, 4-, or 6-mm thickness were photopolymerized for 10 seconds from the top using a polywave (Bluephase Style) or single–peak (Elipar S10) LCU, while a spectrophotometer monitored in real time the transmitted irradiance and radiant exposure reaching the bottom of the specimen. After 24 hours of storage in distilled water at 37°C, the Vickers microhardness (VH) was measured at top and bottom. Results were analyzed using multiple-way analysis of variance, Tukey post hoc tests, and multivariate analysis (α=0.05). Results: The choice of LCU had no significant effect on the total amount of light transmitted through the five bulk-fill RBCs at each thickness. The...
Bookmarks Related papers MentionsView impact
Bioorganic & Medicinal Chemistry Letters, 2000
Bookmarks Related papers MentionsView impact
The journal of adhesive dentistry, 2018
The use of resin-based composites, both clinically and for laboratory studies, continues to incre... more The use of resin-based composites, both clinically and for laboratory studies, continues to increase. As is well known, the quantity (radiant exposure in J/cm2) and characteristics (wavelength in mW/nm and beam profile) of light delivered to a photocured resin will have a significant impact on its polymerization. The nature of light emitting diodes (LEDs) means that, unlike halogen (QTH) light sources, they can only produce a narrow emission spectrum. Thus, not all LED light-curing units (LCUs) deliver the same wavelengths of light and, in order to produce a broad spectrum of light, LED LCUs must contain multiple LEDs. Depending on the optical design of the LCU, both the emission spectrum and the radiant emittance may be non-uniformly distributed across the light tip of the LCU. Furthermore, the irradiance and the beam profile of the light received by the resin will change as the distance from the light tip to the composite surface increases. If we wish for research that requires th...
Bookmarks Related papers MentionsView impact
STOMATOLOGY EDU JOURNAL, 2018
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
PLOS ONE
Background Given the increasing use of photo-activated resins in dentistry, dentists and research... more Background Given the increasing use of photo-activated resins in dentistry, dentists and researchers need a user-friendly dental radiometer to measure the power output from dental light-curing units (LCUs). Objective Our goal was to measure the accuracy of two brands of dental radiometers in reporting the power (mW) from twelve brands of contemporary LCUs compared to a ‘gold standard’ (GS) reference value obtained from an integrating sphere attached to a fiberoptic spectroradiometer. Methods The power output was measured from two units of 12 brands of LCUs, five times on the ‘‘GS” system, five times on two Bluephase Meter II dental radiometers, and five times on two Mini Gig hand-held spectroradiometers. The emission spectrum was also recorded using the ‘GS’ integrating sphere. The power values reported by each meter were subjected to t-tests to compare the two examples of each LCU, and 3-way ANOVA followed by Bonferroni’s post-hoc tests. Regression analyses were also performed to d...
Bookmarks Related papers MentionsView impact
The Journal of the American Dental Association, 2019
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2017
SUMMARY Purpose: This study examined the influence of different emission spectra (single-peak and... more SUMMARY Purpose: This study examined the influence of different emission spectra (single-peak and broad-spectrum) light-curing units (LCUs) delivering the same radiant exposures at irradiance values of 1200 or 3600 mW/cm2 on the polymerization and light transmission of four resin-based composites (RBCs). Methods and Materials: Two prototype LCUs that used the same light tip, but were either a single-peak blue or a broad-spectrum LED, were used to deliver the same radiant exposures to the top surfaces of the RBCs using either standard (1200 mW/cm2) or high irradiance (3600 mW/cm2) settings. The emission spectrum and radiant power from the LCUs were measured with a laboratory-grade integrating sphere coupled to a spectrometer, and the light beam was assessed with a beam profiler camera. Four RBCs (Filtek Supreme Ultra A2, Tetric EvoCeram A2, Tetric EvoCeram T, and TPH Spectra High Viscosity A2) were photoactivated using four different light conditions: single-peak blue/standard irradi...
Bookmarks Related papers MentionsView impact
European Journal of General Dentistry
Objectives The manufacturers of budget light-curing units (LCUs) often claim to provide high-qual... more Objectives The manufacturers of budget light-curing units (LCUs) often claim to provide high-quality units that are equivalent to LCUs from major manufacturers. This study investigated the effects of battery discharge on the light output from different budget LCUs compared to a major manufacturer. Materials and Methods Two brands of budget LCUs (LY-A180 and LED-CL) were compared to a control LCU from a major manufacturer (3M). The LCUs were fully charged, and their light outputs were measured over one battery discharge cycle using repeated 10-second exposures at a 0-mm distance. Statistical Analysis Data were analyzed using one-way analysis of variance and Bonferroni post-hoc test. Results The budget LCUs delivered fluctuating light output values. In their first exposure, the budget LCUs delivered between 205 and 444 mW power, an irradiance between 533 and 1154 mW/cm2, and a radiant exposure between 5.3 and 11.5 J/cm2. As the number of exposures increased, their light output decreas...
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2018
SUMMARY Objective: To evaluate the effects of different mold materials, their diameters, and ligh... more SUMMARY Objective: To evaluate the effects of different mold materials, their diameters, and light-curing units on the mechanical properties of three resin-based composites (RBC). Methods and Materials: A conventional nano-filled resin composite (Filtek Supreme Ultra, 3M Oral Care, St Paul, MN, USA) and two bulk-fill composites materials, Tetric Evoceram Bulk fill (Ivoclar Vivadent, Schaan, Liechtenstein) and Aura Bulk Fill (SDI, Bayswater, VIC, Australia), were tested. A total of 240 specimens were fabricated using metal or white semitransparent Delrin molds that were 4 or 10 mm in diameter. The RBCs were light cured for 40 seconds on the high-power setting of either a monowave (DeepCure-S, 3M Oral Care) or polywave (Bluephase G2, Ivoclar Vivadent) light-emitting diode (LED) curing unit. The depth of cure was determined using a scraping test, according to the 2009 ISO 4049 test method. Data were analyzed using multivariate analysis of variance followed by Tukey multiple comparison ...
Bookmarks Related papers MentionsView impact
International Endodontic Journal, 2009
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2016
SUMMARY Recently, “budget” dental light-emitting diode (LED)–based light-curing units (LCUs) have... more SUMMARY Recently, “budget” dental light-emitting diode (LED)–based light-curing units (LCUs) have become available over the Internet. These LCUs claim equal features and performance compared to LCUs from major manufacturers, but at a lower cost. This study examined radiant power, spectral emission, beam irradiance profiles, effective emission ratios, and the ability of LCUs to provide sustained output values during the lifetime of a single, fully charged battery. Three examples of each budget LCU were purchased over the Internet (KY-L029A and KY-L036A, Foshan Keyuan Medical Equipment Co, and the Woodpecker LED.B, Guilin Woodpecker Medical Instrument Co). Major dental manufacturers provided three models: Elipar S10 and Paradigm (3M ESPE) and the Bluephase G2 (Ivoclar Vivadent). Radiant power emissions were measured using a laboratory-grade thermopile system, and the spectral emission was captured using a spectroradiometer system. Irradiance profiles at the tip end were measured using...
Bookmarks Related papers MentionsView impact
The International journal of prosthodontics, 2021
PURPOSE To evaluate the effect of tooth brushing and dentifrice fluoride (F-) concentration on ch... more PURPOSE To evaluate the effect of tooth brushing and dentifrice fluoride (F-) concentration on changes in color and translucency (ΔE00 and ΔT00, respectively), surface gloss (GS), surface roughness (Sa), and microstructure of a glazed CAD/CAM ceramic. MATERIALS AND METHODS Ceramic blocks (e.max/CAD) were sectioned into rectangular plates (14 x 12 x 1 mm), and one surface of each sample was glazed. Samples were divided into three groups according to the F- concentration in the dentifrice (0, 1,100, and 5,000 μg/g) and were then subjected to 60,000 tooth brushing cycles. Luminosity and color were measured using a spectrophotometer at baseline and after every 20,000 cycles to obtain their ΔE00 and ΔT00 values. Another set of samples was prepared to measure the GS with a gloss meter and the Sa with a confocal laser microscope. The GS and Sa results were subjected to analysis of variance, Tukey test, and Dunnett test (α = .05). RESULTS After 60,000 tooth brushing cycles, all of the varia...
Bookmarks Related papers MentionsView impact
Iranian Endodontic Journal, 2014
Introduction: The aim of this descriptive cross-sectional study was to assess the general dental ... more Introduction: The aim of this descriptive cross-sectional study was to assess the general dental practitioners (GDPs)’s knowledge regarding the emergency management of traumatic dental injuries (TDI) in Isfahan, Iran. Methods and Materials: In this study a two-part questionnaire consisting of 14 questions was distributed among 241 GDPs. Part 1 included seven questions focusing on personal and professional information and part 2 asked questions about seven given cases of dental traumas. One score was dedicated to each correct answer; the total score of 0 to 4 was considered as poor knowledge, while scores 5-8, 9-11 and 12-14 were assigned as moderate, good and excellent knowledge, respectively. The data were analyzed using the Student’s t-test and one-way ANOVA. Spearman’s and Pearson’s correlation coefficient were used to determine the associations between the emergency treatment knowledge and dentists’ professional information. Results: With regards to the level of GDP’s knowledge,...
Bookmarks Related papers MentionsView impact
Dental Materials, 2018
Bookmarks Related papers MentionsView impact
Operative dentistry
Bookmarks Related papers MentionsView impact
British Dental Journal, 1996
Bookmarks Related papers MentionsView impact
The Journal of the American Dental Association
The perils of online purchasing ... ( https://authors.elsevier.com/a/1edif\_46QxGnd )
Bookmarks Related papers MentionsView impact
Operative Dentistry, 2018
SUMMARY Objectives: This study compared light transmission through different thicknesses of bulk-... more SUMMARY Objectives: This study compared light transmission through different thicknesses of bulk-fill resin-based composites (RBCs) using a polywave and a single-peak light-emitting diode light-curing unit (LCU). The effect on the surface hardness was also evaluated. Methods: Five bulk-fill RBCs were tested. Specimens (n=5) of 1-, 2-, 4-, or 6-mm thickness were photopolymerized for 10 seconds from the top using a polywave (Bluephase Style) or single–peak (Elipar S10) LCU, while a spectrophotometer monitored in real time the transmitted irradiance and radiant exposure reaching the bottom of the specimen. After 24 hours of storage in distilled water at 37°C, the Vickers microhardness (VH) was measured at top and bottom. Results were analyzed using multiple-way analysis of variance, Tukey post hoc tests, and multivariate analysis (α=0.05). Results: The choice of LCU had no significant effect on the total amount of light transmitted through the five bulk-fill RBCs at each thickness. The...
Bookmarks Related papers MentionsView impact
Bioorganic & Medicinal Chemistry Letters, 2000
Bookmarks Related papers MentionsView impact
The journal of adhesive dentistry, 2018
The use of resin-based composites, both clinically and for laboratory studies, continues to incre... more The use of resin-based composites, both clinically and for laboratory studies, continues to increase. As is well known, the quantity (radiant exposure in J/cm2) and characteristics (wavelength in mW/nm and beam profile) of light delivered to a photocured resin will have a significant impact on its polymerization. The nature of light emitting diodes (LEDs) means that, unlike halogen (QTH) light sources, they can only produce a narrow emission spectrum. Thus, not all LED light-curing units (LCUs) deliver the same wavelengths of light and, in order to produce a broad spectrum of light, LED LCUs must contain multiple LEDs. Depending on the optical design of the LCU, both the emission spectrum and the radiant emittance may be non-uniformly distributed across the light tip of the LCU. Furthermore, the irradiance and the beam profile of the light received by the resin will change as the distance from the light tip to the composite surface increases. If we wish for research that requires th...
Bookmarks Related papers MentionsView impact
STOMATOLOGY EDU JOURNAL, 2018
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact