This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided ... more Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided design and computer-aided manufacturing (CAD/CAM) technology have recently gained popularity. Their esthetic appeal is crucially dependent on the color accuracy, influenced by prosthesis thickness and multilayer composition due to CAD/CAM milling positions. This study comprehensively investigated how these two factors impacted color accuracy, thereby enhancing our understanding of color outcomes. Materials and Methods. One hundred monolithic multilayer zirconia specimens with 10 × 10 mm square shape were milled in four different positions and five different thicknesses (1.0, 1.5, 2.0, 2.5, and 3.0 mm). The specimens were placed on an A3 shade resin composite substrate, and CIELAB values (L ∗ , a ∗ , and b ∗ ) were measured using a spectrophotometer. Delta E (ΔE) values were calculated to quantify the color differences between the specimens and the A3 VITA classical shade tab and co...
Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided ... more Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided design and computer-aided manufacturing (CAD/CAM) technology have recently gained popularity. Their esthetic appeal is crucially dependent on the color accuracy, influenced by prosthesis thickness and multilayer composition due to CAD/CAM milling positions. This study comprehensively investigated how these two factors impacted color accuracy, thereby enhancing our understanding of color outcomes. Materials and Methods. One hundred monolithic multilayer zirconia specimens with 10 × 10 mm square shape were milled in four different positions and five different thicknesses (1.0, 1.5, 2.0, 2.5, and 3.0 mm). The specimens were placed on an A3 shade resin composite substrate, and CIELAB values (L * , a * , and b *) were measured using a spectrophotometer. Delta E (ΔE) values were calculated to quantify the color differences between the specimens and the A3 VITA classical shade tab and compared with the perceptibility and acceptability thresholds of ΔE = 1.2 and 2.7, respectively. Pearson correlation, two-way ANOVA, and Tukey multiple comparisons (α = 0.05) were performed. Results. The proportion of the dentin layer was positively correlated with the a * and b * values, while specimen thickness was positively correlated with the a * value and negatively correlated with the L * and b * values. Significant difference in ΔE value due to different CAD/CAM positions was not observed within the same specimen thickness. Perceptible color differences were observed in specimens with thicknesses greater than 1 mm, while specimens with 1 mm thickness fell within the clinically acceptable range. Highest ΔE value was found in the specimen with 1 mm thickness. Conclusions. Different compositions of multilayers in the final restoration due to different CAD/CAM positions do not significantly affect the color appearance of ultra-translucent multilayer zirconia, with color only influenced by specimen thickness.
Chulalongkorn University Dental Journal วารสารทันตแพทยศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย, May 4, 2013
Objective To examine the effects of one and two-bottle silane coupling agents on bond strengths b... more Objective To examine the effects of one and two-bottle silane coupling agents on bond strengths between a resin composite and 4 prefabricated fiber posts. Materials and methods Twelve prefabricated fiber posts of DT Light post ® , FRC postec ® , Easy post ® and Innopost compaq ® , were used. The posts of each product were randomly divided into 2 subgroups according to silane used for surface treatment, one-bottle (Monobond S ® ) or two-bottle (Porcelain liner M ® ), so there were 8 experimental groups. A light-cured resin composite was used to build-up the core around each post. Serially cut a composite post and core into beam for microtensile bond strength (µTBS) test. Eighteen specimens were prepared for each group. Each specimen was loaded in tension with universal testing machine until failure. The data were analyzed using the one way ANOVA and t-test at 95% confident interval. Results The two-bottle silane (Porcelain liner M ® ) demonstrated significantly higher mean bond strengths between resin composite and prefabricated fiber posts compared to the one-bottle (Monobond S ® ) for all 4 post products ( p <0.05). Mean µTBS were significantly affected by product of fiber post ( p <0.05). All tested specimens showed adhesive failure. Conclusion The two-bottle silane demonstrates a significantly higher µTBS than the one-bottle silane preparation in all 4 products of prefabricated fiber post. (CU Dent J. 2010;33:99-108) Key words : microtensile bond strength; prefabricated fiber post; silane coupling agent
Polyetheretherketone (PEEK) has become an alternative material for orthopaedics and dental implan... more Polyetheretherketone (PEEK) has become an alternative material for orthopaedics and dental implants. However, bio-inertness is an important limitation in this material. In the present study, a hydroxyapatite (HA)–titanium nitride (TiN) coating was fabricated via pulsed DC magnetron sputtering and treated with hydrothermal treatment to improve the bioactive property of PEEK. The dissolution behavior of the coating was studied in simulated body fluid solution (SBF) at 1, 3, 5, 7, 14, 21, 28, and 56 days. The coating surface was analyzed before and after the immersion process by X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), and scanning electron microscope (SEM). The calcium and phosphorus concentration alteration in SBF was quantified by an inductively coupled plasma-optical emission spectrometer (ICP-OES). Coating dissolution and the precipitation of calcium phosphate complex from SBF were observed as occurring suddenly and continuously throughout the immersi...
This study sought to investigate the effect of immersion time in simulated body fluid (SBF) on th... more This study sought to investigate the effect of immersion time in simulated body fluid (SBF) on the adhesion strength of hydrothermally treated hydroxyapatite-titanium nitride (HA-TiN) films on polyetheretherketone (PEEK) substrates. The HA-TiN films were deposited on PEEK substrates via magnetron sputtering and annealed with hydrothermal treatment. The crystalline phase and element compositions on the deposited films were confirmed by X-ray diffractometry (XRD), and X-ray photoelectron spectrometry (XPS). The samples were then immersed in SBF at 37°C for 7 to 56 days, where the surface characterization and chemical composition of the films were analyzed using scanning electron microscopy (SEM), atomic force microscopy (AFM), and XPS. After the in vitro degradation in SBF, the adhesion strength between HA-TiN films and PEEK substrates were measured by a universal testing machine and further investigated the failure mode using a stereomicroscope and SEM. The results demonstrated the i...
Chiang Mai University Journal of Natural Sciences, 2022
This study focused on evaluating the Polylactic acid /Polyethylene glycol (PLA/PEG) combining wit... more This study focused on evaluating the Polylactic acid /Polyethylene glycol (PLA/PEG) combining with bone decellularized extracellular matrix (bone dECM) as the alternative biodegradable material for tissue regenerative purposes. The casting membranes of pure PLA, PLA/PEG blend, and PLA/PEG combining with 5, 10 and 20 wt% bone dECM particles were fabricated and the characteristics of surface morphology, surface contact angle, thermal properties, cell viability, in vitro osteogenesis, and in vitro biodegradative behaviors were investigated. The improvement in hydrophilic characteristic was found in the developing composite. Following the in vitro degradation test in PBS/lysozyme for 7, 30, 60 and 90 days, the composite with higher ratio of bone dECM particles showed the higher percentage of material weight loss. However, the statistically significant of material weight alteration was observed only on the PLA/PEG/20wt% bone dECM after degradation test for 90 days (P ≤0.05). All specimen...
Introduction. The removable partial denture (RPD) components, especially the retentive arm, play ... more Introduction. The removable partial denture (RPD) components, especially the retentive arm, play a major role in the loading characteristic on supporting structures. Objective. To evaluate and compare the effect of different clasp designs on the stress distribution pattern, maximum von Mises stress, and average hydrostatic pressure on abutment teeth, as well as edentulous ridges, mini dental implants (MDIs), and peri-implant bone between the conventional removable partial denture (CRPD) and mini dental implant-assisted distal extension removable partial denture (IARPD) using a three-dimensional finite element analysis (3D FEA). Materials and Methods. 3D FEA models of mandibular arches, with and without bilateral MDI at the second molar areas, and Kennedy class I RPD frameworks, with RPA, RPI, Akers, and no clasp component, were generated. A total of 200 N vertical load was bilaterally applied on both sides of distal extension areas, and the stress was analyzed by 3D FEA. Results. Th...
Chiang Mai Dental Journal เชียงใหม่ทันตแพทยสาร, Sep 4, 2012
The loss of the natural posterior teeth is the most common dental problem, especially in the elde... more The loss of the natural posterior teeth is the most common dental problem, especially in the elderly people. The optimal dental management for this condition remains a controversial issue. A treatment plan based on the shortened dental arch concept may be a reasonable alternative, especially in patients with certain restrictions, who cannot be treated as ideal.
Objective To study the effects of ultraviolet C (UVC) radiation at various exposure times on tens... more Objective To study the effects of ultraviolet C (UVC) radiation at various exposure times on tensile bond strength between heat- and chemical-cured acrylic resin. Materials and methods Fifty dumbbell-shaped, heat-cured acrylic resin specimens were prepared according to the ASTM standard No. D683 and randomly divided into five groups (10 per group). Each specimen was cut into two symmetrical parts. The cross-sectional area of each specimen was irradiated with UVC for a period specified for each group (0, 1, 5, 15 and 60 min) then chemical-cured acrylic resin was added to restore the dumbbell shape. A universal testing machine was used for the tensile bond strength testing (TBS). The data were analyzed by one way ANOVA and multiple comparison test at the 95% confidence interval. Results The tensile bond strength value at the boundaries between the heat- and the chemical-cured acrylic resin of the 1-and 5-min UVC irradiation groups (18.77±3.62 and 18.41±3.79 MPa) were significantly hig...
Candida albicans is a common overgrowth in people wearing dentures. Long-term use of antifungal c... more Candida albicans is a common overgrowth in people wearing dentures. Long-term use of antifungal chemicals carries a risk of toxic side effects. This study focused on the edible Piper betle extract because of its safety. The broth dilution method was applied for antifungal determination of the ethyl acetate fractionated extract (fEA) and fEA-loaded polymeric micelles (PMF). The PMF was prepared by thin-film hydration using poloxamer 407 as a polymer base. The results found that the weight ratio of fEA to polymer is the main factor to obtain PMF system as a clear solution, nanoparticle sizes, narrow size distribution, negative zeta potential, and high entrapment efficiency. The activity of PMF against C. albicans is significantly higher than fEA alone, with a minimum fungicidal concentration of 1.5 mg/mL. PMF from 1:3 ratio of fEA to polymer is used to develop a denture-soaking solution contained 1.5 mg fEA/mL (PMFS). A clinical study on dentures of 15 volunteers demonstrated an 86.1 ...
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided ... more Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided design and computer-aided manufacturing (CAD/CAM) technology have recently gained popularity. Their esthetic appeal is crucially dependent on the color accuracy, influenced by prosthesis thickness and multilayer composition due to CAD/CAM milling positions. This study comprehensively investigated how these two factors impacted color accuracy, thereby enhancing our understanding of color outcomes. Materials and Methods. One hundred monolithic multilayer zirconia specimens with 10 × 10 mm square shape were milled in four different positions and five different thicknesses (1.0, 1.5, 2.0, 2.5, and 3.0 mm). The specimens were placed on an A3 shade resin composite substrate, and CIELAB values (L ∗ , a ∗ , and b ∗ ) were measured using a spectrophotometer. Delta E (ΔE) values were calculated to quantify the color differences between the specimens and the A3 VITA classical shade tab and co...
Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided ... more Background. Ultra-translucent multilayered zirconia restorations fabricated using computer-aided design and computer-aided manufacturing (CAD/CAM) technology have recently gained popularity. Their esthetic appeal is crucially dependent on the color accuracy, influenced by prosthesis thickness and multilayer composition due to CAD/CAM milling positions. This study comprehensively investigated how these two factors impacted color accuracy, thereby enhancing our understanding of color outcomes. Materials and Methods. One hundred monolithic multilayer zirconia specimens with 10 × 10 mm square shape were milled in four different positions and five different thicknesses (1.0, 1.5, 2.0, 2.5, and 3.0 mm). The specimens were placed on an A3 shade resin composite substrate, and CIELAB values (L * , a * , and b *) were measured using a spectrophotometer. Delta E (ΔE) values were calculated to quantify the color differences between the specimens and the A3 VITA classical shade tab and compared with the perceptibility and acceptability thresholds of ΔE = 1.2 and 2.7, respectively. Pearson correlation, two-way ANOVA, and Tukey multiple comparisons (α = 0.05) were performed. Results. The proportion of the dentin layer was positively correlated with the a * and b * values, while specimen thickness was positively correlated with the a * value and negatively correlated with the L * and b * values. Significant difference in ΔE value due to different CAD/CAM positions was not observed within the same specimen thickness. Perceptible color differences were observed in specimens with thicknesses greater than 1 mm, while specimens with 1 mm thickness fell within the clinically acceptable range. Highest ΔE value was found in the specimen with 1 mm thickness. Conclusions. Different compositions of multilayers in the final restoration due to different CAD/CAM positions do not significantly affect the color appearance of ultra-translucent multilayer zirconia, with color only influenced by specimen thickness.
Chulalongkorn University Dental Journal วารสารทันตแพทยศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย, May 4, 2013
Objective To examine the effects of one and two-bottle silane coupling agents on bond strengths b... more Objective To examine the effects of one and two-bottle silane coupling agents on bond strengths between a resin composite and 4 prefabricated fiber posts. Materials and methods Twelve prefabricated fiber posts of DT Light post ® , FRC postec ® , Easy post ® and Innopost compaq ® , were used. The posts of each product were randomly divided into 2 subgroups according to silane used for surface treatment, one-bottle (Monobond S ® ) or two-bottle (Porcelain liner M ® ), so there were 8 experimental groups. A light-cured resin composite was used to build-up the core around each post. Serially cut a composite post and core into beam for microtensile bond strength (µTBS) test. Eighteen specimens were prepared for each group. Each specimen was loaded in tension with universal testing machine until failure. The data were analyzed using the one way ANOVA and t-test at 95% confident interval. Results The two-bottle silane (Porcelain liner M ® ) demonstrated significantly higher mean bond strengths between resin composite and prefabricated fiber posts compared to the one-bottle (Monobond S ® ) for all 4 post products ( p <0.05). Mean µTBS were significantly affected by product of fiber post ( p <0.05). All tested specimens showed adhesive failure. Conclusion The two-bottle silane demonstrates a significantly higher µTBS than the one-bottle silane preparation in all 4 products of prefabricated fiber post. (CU Dent J. 2010;33:99-108) Key words : microtensile bond strength; prefabricated fiber post; silane coupling agent
Polyetheretherketone (PEEK) has become an alternative material for orthopaedics and dental implan... more Polyetheretherketone (PEEK) has become an alternative material for orthopaedics and dental implants. However, bio-inertness is an important limitation in this material. In the present study, a hydroxyapatite (HA)–titanium nitride (TiN) coating was fabricated via pulsed DC magnetron sputtering and treated with hydrothermal treatment to improve the bioactive property of PEEK. The dissolution behavior of the coating was studied in simulated body fluid solution (SBF) at 1, 3, 5, 7, 14, 21, 28, and 56 days. The coating surface was analyzed before and after the immersion process by X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), and scanning electron microscope (SEM). The calcium and phosphorus concentration alteration in SBF was quantified by an inductively coupled plasma-optical emission spectrometer (ICP-OES). Coating dissolution and the precipitation of calcium phosphate complex from SBF were observed as occurring suddenly and continuously throughout the immersi...
This study sought to investigate the effect of immersion time in simulated body fluid (SBF) on th... more This study sought to investigate the effect of immersion time in simulated body fluid (SBF) on the adhesion strength of hydrothermally treated hydroxyapatite-titanium nitride (HA-TiN) films on polyetheretherketone (PEEK) substrates. The HA-TiN films were deposited on PEEK substrates via magnetron sputtering and annealed with hydrothermal treatment. The crystalline phase and element compositions on the deposited films were confirmed by X-ray diffractometry (XRD), and X-ray photoelectron spectrometry (XPS). The samples were then immersed in SBF at 37°C for 7 to 56 days, where the surface characterization and chemical composition of the films were analyzed using scanning electron microscopy (SEM), atomic force microscopy (AFM), and XPS. After the in vitro degradation in SBF, the adhesion strength between HA-TiN films and PEEK substrates were measured by a universal testing machine and further investigated the failure mode using a stereomicroscope and SEM. The results demonstrated the i...
Chiang Mai University Journal of Natural Sciences, 2022
This study focused on evaluating the Polylactic acid /Polyethylene glycol (PLA/PEG) combining wit... more This study focused on evaluating the Polylactic acid /Polyethylene glycol (PLA/PEG) combining with bone decellularized extracellular matrix (bone dECM) as the alternative biodegradable material for tissue regenerative purposes. The casting membranes of pure PLA, PLA/PEG blend, and PLA/PEG combining with 5, 10 and 20 wt% bone dECM particles were fabricated and the characteristics of surface morphology, surface contact angle, thermal properties, cell viability, in vitro osteogenesis, and in vitro biodegradative behaviors were investigated. The improvement in hydrophilic characteristic was found in the developing composite. Following the in vitro degradation test in PBS/lysozyme for 7, 30, 60 and 90 days, the composite with higher ratio of bone dECM particles showed the higher percentage of material weight loss. However, the statistically significant of material weight alteration was observed only on the PLA/PEG/20wt% bone dECM after degradation test for 90 days (P ≤0.05). All specimen...
Introduction. The removable partial denture (RPD) components, especially the retentive arm, play ... more Introduction. The removable partial denture (RPD) components, especially the retentive arm, play a major role in the loading characteristic on supporting structures. Objective. To evaluate and compare the effect of different clasp designs on the stress distribution pattern, maximum von Mises stress, and average hydrostatic pressure on abutment teeth, as well as edentulous ridges, mini dental implants (MDIs), and peri-implant bone between the conventional removable partial denture (CRPD) and mini dental implant-assisted distal extension removable partial denture (IARPD) using a three-dimensional finite element analysis (3D FEA). Materials and Methods. 3D FEA models of mandibular arches, with and without bilateral MDI at the second molar areas, and Kennedy class I RPD frameworks, with RPA, RPI, Akers, and no clasp component, were generated. A total of 200 N vertical load was bilaterally applied on both sides of distal extension areas, and the stress was analyzed by 3D FEA. Results. Th...
Chiang Mai Dental Journal เชียงใหม่ทันตแพทยสาร, Sep 4, 2012
The loss of the natural posterior teeth is the most common dental problem, especially in the elde... more The loss of the natural posterior teeth is the most common dental problem, especially in the elderly people. The optimal dental management for this condition remains a controversial issue. A treatment plan based on the shortened dental arch concept may be a reasonable alternative, especially in patients with certain restrictions, who cannot be treated as ideal.
Objective To study the effects of ultraviolet C (UVC) radiation at various exposure times on tens... more Objective To study the effects of ultraviolet C (UVC) radiation at various exposure times on tensile bond strength between heat- and chemical-cured acrylic resin. Materials and methods Fifty dumbbell-shaped, heat-cured acrylic resin specimens were prepared according to the ASTM standard No. D683 and randomly divided into five groups (10 per group). Each specimen was cut into two symmetrical parts. The cross-sectional area of each specimen was irradiated with UVC for a period specified for each group (0, 1, 5, 15 and 60 min) then chemical-cured acrylic resin was added to restore the dumbbell shape. A universal testing machine was used for the tensile bond strength testing (TBS). The data were analyzed by one way ANOVA and multiple comparison test at the 95% confidence interval. Results The tensile bond strength value at the boundaries between the heat- and the chemical-cured acrylic resin of the 1-and 5-min UVC irradiation groups (18.77±3.62 and 18.41±3.79 MPa) were significantly hig...
Candida albicans is a common overgrowth in people wearing dentures. Long-term use of antifungal c... more Candida albicans is a common overgrowth in people wearing dentures. Long-term use of antifungal chemicals carries a risk of toxic side effects. This study focused on the edible Piper betle extract because of its safety. The broth dilution method was applied for antifungal determination of the ethyl acetate fractionated extract (fEA) and fEA-loaded polymeric micelles (PMF). The PMF was prepared by thin-film hydration using poloxamer 407 as a polymer base. The results found that the weight ratio of fEA to polymer is the main factor to obtain PMF system as a clear solution, nanoparticle sizes, narrow size distribution, negative zeta potential, and high entrapment efficiency. The activity of PMF against C. albicans is significantly higher than fEA alone, with a minimum fungicidal concentration of 1.5 mg/mL. PMF from 1:3 ratio of fEA to polymer is used to develop a denture-soaking solution contained 1.5 mg fEA/mL (PMFS). A clinical study on dentures of 15 volunteers demonstrated an 86.1 ...
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