Tunthawiroon, Phacharaphon

Loading...
Thumbnail Image
Preferred name
Tunthawiroon, Phacharaphon
Alternative Name
TUNTHAWIROON, Phacharaphon
Tunthawiroon, P.
Main Affiliation
Email
phacharaphon.tu@kmitl.ac.th

Settings

Now showing 1 - 4 of 4
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Influence of mouthwash rinsing on the mechanical properties of polymeric ligature ties used for dental applications
    (2021-07-02)
    Phukaoluan, Aphinan
    ;
    Khantachawana, Anak
    ;
    Dechkunakorn, Surachai
    ;
    Anuwongnukroh, Niwat
    ;
    Tunthawiroon, Phacharaphon
    Mouthwashes are used during dental treatments to mitigate the complications caused by poor oral hygiene. However, these solutions also affect the properties of dental appliances, including those used in orthodontics. This point has been investigated in this study focusing on the changes in mechanical properties of polymeric orthodontic ligature ties. Commercial ties from four brands were characterized in terms of their maximum forces and displacement, delivery forces, molecular structures, and microscopic morphology. These properties were compared against the ties, which were rinsed with commercial mouthwashes from three manufacturers. The results showed that mouthwash rinsing significantly reduced the maximum bearable forces of ligature ties by up to 73.1%, whereas the reduction in their maximum displacement was up to 74.5% across all tested brands. Significant changes in microscopic morphology of ligature ties were observed after mouthwash rinsing, but not their molecular structure. Furthermore, mouthwash rinsing also reduced the delivery forces from ligature ties by between 20.9 and 32.9% at their first deformation cycle. It can be concluded from this study that mouthwashes have significant impact on the mechanical properties of polymeric orthodontic ligature ties and could also potentially affect the overall efficacy of orthodontic and other dental treatments.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    The Addition of Fluoride to the Eggshell-derived Hydroxyapatite: A Preliminary Study
    (2021-01-01)
    Uthayaphamornwat, Vilasinee
    ;
    Suksap, Arissara
    ;
    Khantachawana, Anak
    ;
    Kitiwan, Mettaya
    ;
    Srirussamee, Kasama
    Dental caries are one of the major oral health problems, which could be mitigated by addressing the dental defects. Hydroxyapatite (HA) is commonly used for tooth and bone replacement due toits similar properties as the native hard tissues. Natural sources with abundant availability, such as eggshells, could be used to synthesize HA. Moreover, with the presence of fluorine in HA, it was suggested that the performance of this material could be enhanced in terms of material stability and anti-caries properties. This preliminary study aims to compare two methods used to produce fluoride-added HA from eggshells, which are pH cycling and wet precipitation methods. The molecular structure, crystal structure, particle appearance and chemical compositions of the obtained samples were characterized. The results suggested that pH cycling has provided samples with higher fluorine content, more crystalline structure and less CO3than those obtained from wet precipitation method. Therefore, pH cycling method appears to be more suitable for further processing and characterization of the fluoride-added HA samples derived from eggshells.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Characterization of Fluoride-added Hydroxyapatite Derived from Eggshells for Dental Application
    (2023-01-01)
    Uthayaphamornwat, Vilasinee
    ;
    Khantachawana, Anak
    ;
    Kitiwan, Mettaya
    ;
    Srirussamee, Kasama
    ;
    Tunthawiroon, Phacharaphon
    Hydroxyapatite (HA) is one of the potential biomaterials used for treating dental defects. It can be incorporated with fluoride to enhance its anti-caries properties, though other properties could be dependent on processing technique. Hence, this study aims to characterize the influence of sintering on the properties of fluoride-added HA derived from eggshells. FTIR and XRD techniques are used to characterize the chemical and crystal structures of the samples, whilst dissolution test is carried out to characterize material degradation in the acidic environment. The results show that sintering increased the crystallinity in both HA and fluoride-add HA (F-HA) samples, which corresponds with the enhanced stability during the dissolution test. Moreover, it is also found that the addition of fluoride could further stabilize the material structure, though the impurities found in all the samples still need to be minimized. These findings suggest that sintering and fluoride addition could potentially enhance anti-caries properties of eggshell-derived HA, which could be beneficial for dental application in future subject to further process optimization and analysis.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Influence of the Oxide Film on the Performance and Corrosion Resistance of TiNiCu Shape Memory Alloys as the Heat Engine Actuator
    (2024-10-01)
    Phukaoluan, Aphinan
    ;
    Srirussamee, Kasama
    ;
    Khantachawana, Anak
    ;
    Chuchonak, Monthon
    ;
    Tunthawiroon, Phacharaphon
    Shape memory alloys (SMAs) are utilized as an actuator for the heat engine to harvest energy from low-temperature geothermal sources, such as hot springs, which convert thermal energy into mechanical work. However, the alloy processing and engine design still require optimization to improve performance and durability. To discuss their potential as heat engine actuator, this study investigated the influence of oxide films on the TiNiCu SMAs in terms of surface and structural properties, recovery forces, and corrosion resistance. The results show that the surfaces of the etched samples were relatively coarser than those unetched with lower oxygen content. With the presence of oxide film, the Austenite Finish Temperature (Af) temperature of the unetched SMAs was lower with R-phase transformation. Also, it provided higher recovery force at above Af temperature (as high as 8.3 N at 70-mm displacement). Furthermore, the corrosion resistance of the unetched SMAs was higher than the etched samples, as analyzed by open-circuit potential and linear polarization in natural spring water at 70°C. These findings imply that the presence of oxide film could be beneficial for the SMAs when used as an actuator for heat engines, although it may require further study to investigate its impact on the fatigue behavior of the alloys.