Evaluation of thermal stress in hydroxyapatite film fabricated by powder jet deposition

Akatsuka, Ryo; Matsumura, Ken; Noji, Miyoko; Kuriyagawa, Tsunemoto; Sasaki, Keiichi

doi:10.1111/eos.12076

Cited by 4 publications

(19 citation statements)

References 20 publications

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“…These HA layers showed excellent microstructural and mechanical properties, including a micro-Vickers hardness equivalent to that of human enamel and a bonding strength almost equivalent to that of composite resin-enamel. These properties were not influenced by thermal stress [12]. Furthermore, PJD technique and fabricated HA layers showed high biocompatibility and safety in a preclinical trial [13].…”

Section: Introductionmentioning

confidence: 87%

“…The specimens were immersed in distilled water at 37°C for 1 day. Following this immersion, the specimens were subjected to 500 thermal cycles [12,18].…”

Section: Blasting Angle (°) 90mentioning

confidence: 99%

“…In previous studies, the possibility of applying HA layer as a new restorative material with compositional, chemical and mechanical properties corresponding to those of tooth substance was presented [10][11][12][13]. The PJD is a precise mechanical coating technique with using ultrafine particles which accelerated to several hundred meters per second by the jet flow of carrier gas to fabricate functional surfaces with high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The PJD is a precise mechanical coating technique with using ultrafine particles which accelerated to several hundred meters per second by the jet flow of carrier gas to fabricate functional surfaces with high efficiency. PJD is used at room temperature and atmospheric pressure, which enables it to be used with HA particles for the fabrication of HA layers on human teeth [10][11][12][13]. In in vitro studies showed that PJD technique can be used to fabricate thick HA layers on human enamel.…”

Section: Introductionmentioning

confidence: 99%

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Basic Research for New Tooth Whitening Applied the Powder Jet Deposition

Izumita¹,

Akatsuka²,

Hihara³

et al. 2019

Act Scie Dental

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The powder jet deposition (PJD) process is used for creation of hydroxyapatite (HA) layers on human teeth. The fabricated HA layers showed excellent microstructural and mechanical properties in vitro and in vivo. Titanium dioxide (TiO 2) changed the whiteness of the layers because of the selective reflection of light. This raises the possibility that TiO 2-HA layer deposition may improve new whitening treatment for discolored teeth. For the development of new tooth whitening by PJD, the microstructural and mechanical properties of the TiO 2-HA layers, particularly the effects of thermal stress, the color change obtained, and the color stability of the layers after thermal cycling were evaluated. Materials and Methods: The microstructural properties of the TiO 2-HA layers, namely surface thickness and roughness were evaluated from scanning electron microscopy (SEM) images and three-dimensional profiles. The mechanical properties were evaluated by micro-Vickers hardness and bonding strength tests. For color differences and stability, the CIE L*a*b* color system was used, and ΔE* values were calculated before and after the fabrication of the TiO 2-HA layers. For visual color evaluation, images of specimens were taken with a digital camera. Furthermore, these material properties and color differences were evaluated before and after 500 thermal cycles (5-55 °C). Results and Discussion: The TiO 2-HA particles were packed densely in the layers, the maximum thickness of layers was about 60 µm. There were no significant differences in surface roughness, hardness, or bonding strength before and after the thermal cycling. Moreover, these properties were equivalent to those of HA layers fabricated by PJD. The TiO 2-HA layers had increased L* and decreased b* parameter compared with those of the enamel substrates, and the color difference ΔE* was about 6.7 units, indicating that TiO 2-HA layers whitened the color of the treated tooth. Furthermore, it was confirmed from digital camera images that TiO 2-HA layers showed visually perceptible level of whiteness. This color was maintained even after thermal cycling. Conclusion: The fabrication of TiO 2-HA layers by PJD may be a suitable new whitening treatment for discolored teeth.

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Section: Introductionmentioning

confidence: 87%

“…The specimens were immersed in distilled water at 37°C for 1 day. Following this immersion, the specimens were subjected to 500 thermal cycles [12,18].…”

Section: Blasting Angle (°) 90mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Basic Research for New Tooth Whitening Applied the Powder Jet Deposition

Izumita¹,

Akatsuka²,

Hihara³

et al. 2019

Act Scie Dental

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“…Even if the adhesion technique is properly applied, these differences in properties between restorative materials and tooth substance can give rise to different mechanical, thermal, or chemical stresses in the oral cavity and can lead to clinical problems such as drop-off of the restorative material from the tooth or secondary caries [1]. In our previous studies, we presented the possibility of applying a layer of HA as a new restorative material with chemical, compositional, and mechanical properties corresponding to the tooth substance [2,3]. A newly developed advanced technology called powder jet deposition (PJD) was used to create the HA layers.…”

Section: Introductionmentioning

confidence: 99%

Development of Powder Jet Deposition Technique and New Treatment for Discolored Teeth

Izumita

Akatsuka

Tomie

et al. 2016

Interface Oral Health Science 2016

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The powder jet deposition (PJD) process is for creation of a hydroxyapatite (HA) layer on human teeth. To develop the PJD device, the layer-forming properties have improved. Created HA layers with a new handpiece-type PJD device demonstrate excellent material properties in vitro. Titanium dioxide (TiO 2 ) is known to cause whitening because of the selective reflection of the light. Therefore, we assessed the possibility of using the creation of TiO 2 -HA layers with the new PJD device as a new treatment for discolored teeth. In this study, the microstructural and mechanical properties of TiO 2 -HA layers were evaluated under the same conditions of the previous study. These properties were evaluated before and after 500 cycles of thermal cycling (5-55 °C). Furthermore, the CIE L * a * b * color system was used for color measurement and ⊿E * values for color differences were calculated. The maximum thickness of the TiO 2 -HA layers was about 60 μm. There were no significant differences in thickness, hardness, or bonding strength before and after thermal cycling. The layers showed an increased L * parameter and a decreased b * parameter, and the color difference ⊿E * was approximately 6.7 units. Creation of TiO 2 -HA layers by PJD might be a valuable new treatment for discolored teeth.

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A novel treatment based on powder jet deposition technique for dentin hypersensitivity: a randomized controlled trial

Hihara,

Izumita,

Kawata

et al. 2023

BMC Oral Health

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Background This study aimed to evaluate the efficacy and safety of dentin hypersensitivity (DH) treatment using a newly developed device based on a powder jet deposition (PJD) technique that creates a hydroxyapatite (HAP) layer on the dentin surface, thereby alleviating the hypersensitivity. The effect of the PJD treatment was compared with that of conventional treatment using Teethmate Desensitizer (TMD; calcium-phosphate containing material with TTCP (Ca4(PO4)2O) and DCPA (CaHPO4)), which has been used clinically in Japan with well-confirmed effectiveness. Materials and methods A randomized controlled trial was conducted including 35 patients who had symptoms of DH in two or more quadrants. Two test teeth were selected per patient (70 teeth in total) and randomly assigned to PJD or TMD treatment. The efficacy was evaluated using the improvement rate for air and scratch pain according to the scores obtained via visual analog scale 12 weeks after treatment. The safety assessment was performed focusing on gingival index (GI) and spontaneous pain. The t-test was used to analyze the non-inferiority of PJD treatment compared to TMD treatment. Results The improvement rate of air pain was 69.0% for PJD and 69.7% for TMD. The improvement rate of scratch pain was 80.8% for PJD and 81.7% for TMD. Non-inferiority with a margin of 10% was not observed for both air and scratch pain. No change was observed in GI from baseline and the improvement rate of spontaneous pain for PJD was higher than that for TMD. Conclusion Non-inferiority of PJD to TMD treatment was not observed in this study; however, it was not statistically demonstrated, and the results were thus interpreted as inconclusive. PJD did improve the DH symptoms, as did TMD. PJD’s therapeutic effect was most likely attributable to the deposition of a HAP layer on the tooth surface, which would alleviate hypersensitivity for at least 12 weeks without causing severe adverse events. Trial registration UMIN-CTR. ID: UMIN000025022. date: 02/12/2016.

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Evaluation of thermal stress in hydroxyapatite film fabricated by powder jet deposition

Cited by 4 publications

References 20 publications

Basic Research for New Tooth Whitening Applied the Powder Jet Deposition

Basic Research for New Tooth Whitening Applied the Powder Jet Deposition

Development of Powder Jet Deposition Technique and New Treatment for Discolored Teeth

A novel treatment based on powder jet deposition technique for dentin hypersensitivity: a randomized controlled trial

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