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Phatphutthitham C, Niyatiwatchanchai B, Rujiraprasert P, Tagami J, Osathanon T, Srijunbarl A, Singthong T, Suriyasangpetch S, Nantanapiboon D. Effect of Grinding and Polishing Protocols on Surface Roughness, Flexural Strength, and Phase Transformation of High-Translucent 5 mol% Yttria-Partially Stabilized Zirconia. Eur J Dent 2024. [PMID: 38942054 DOI: 10.1055/s-0044-1787001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/30/2024] Open
Abstract
OBJECTIVES This study evaluated surface roughness, biaxial flexural strength, and phase transformation of 5Y-PSZ after grinding and polishing with different protocols. MATERIAL AND METHODS Two commercial 5Y-PSZ, Lava Esthetic (L) and Cercon xt (C), were used and divided into 3 groups: LC and CC represented unpolished control groups; LE and CE were polished with protocol I (EVE DIASYNT® PLUS HP following with EVE DIACERA RA); and LJ and CJ were polished with protocol II (Superfine diamond bur following with Jota ZIR Gloss polishing kit). Surface roughness was evaluated after polishing step-by-step with a contact-type profilometer. After high-gross polishing, the specimens were subjected to biaxial flexural strength test, crystallographic microstructure analysis using an X-ray diffractometer (XRD), and surface micro-topography using scanning electron microscopy (SEM). STATISTICAL ANALYSIS Surface roughness differences after each step and biaxial flexural strength between groups were evaluated with one-way ANOVA, followed by Bonferroni post-hoc analysis. Changes in surface roughness across four different time points within groups were assessed using one-way repeated measures ANOVA, followed by Bonferroni post-hoc analysis. RESULTS After high-gross polishing, both polishing protocols showed significantly lower surface roughness than the grinding group (p < 0.05). The LE and CE groups exhibited the highest surface roughness values, which were significant differences from the LJ and CJ groups (p < 0.05). The LE group showed significantly lower biaxial flexural strength compared to the LC group (p < 0.05). However, there was no statistically significant difference in the CE and CJ groups compared to the control group (p > 0.05). Furthermore, all polishing protocols did not change the phase transformation of zirconia. CONCLUSION Polishing protocol II provided a smoother surface than the protocol I after high-gross polishing, while the biaxial flexural strength of materials remained unaffected.
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Affiliation(s)
| | | | - Phakvalunch Rujiraprasert
- Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Junji Tagami
- Faculty of Dentistry, Chulalongkorn University, Pathumwan, Bangkok, Thailand
| | - Thanaphum Osathanon
- Center of Excellence for Dental Stem Cell Biology, Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Anucharte Srijunbarl
- Dental Material Research and Development Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Thawanrat Singthong
- Dental Material Research and Development Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Sarat Suriyasangpetch
- Department of Advanced General Dentistry, Faculty of Dentistry, Mahidol University, Bangkok, Thailand
| | - Dusit Nantanapiboon
- Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
- Dental Material Research and Development Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
- Clinic of General, Special Care, and Geriatric Dentistry, Center for Dental Medicine, University of Zurich, Zurich, Switzerland
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Miotto LN, Villas-Bôas MDOC, Zanotto ED, Ferreira EB, Fais LMG, Pinelli LAP. Surface properties of a new lithium disilicate glass-ceramic after grinding. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2021; 32:110. [PMID: 34453617 PMCID: PMC8403127 DOI: 10.1007/s10856-021-06592-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
This study aimed to evaluate the effect of grinding on some surface properties of two lithium disilicate-based glass-ceramics, one experimental new product denominated LaMaV Press (UFSCar-Brazil) and another commercial known as IPS e-max Press (Ivoclar), in the context of simulated clinical adjustment. Discs (N = 24, 12 mm in diameter) were separated into four groups: LaMaV Press with no grinding (E), LaMaV Press after grinding (EG), IPS e-max Press with no grinding (C), and IPS e-max Press after grinding (CG). A 0.1-mm deep grinding was carried out on EG and CG samples (final thickness of 1.4 mm) using a diamond stone in a low-speed device. The E and C samples had the same thickness. The effect of grinding on the sample surfaces was evaluated by X-ray diffraction, mechanical and optical profilometry, scanning electron microscopy, goniometry, and Vickers hardness. The mean roughness (Ra) was evaluated by Kruskal-Wallis and Student-Newman-Keuls statistics. The surface energy (SE) by the sessile drop method and Vickers hardness (VH) were analyzed using two-way ANOVA. The Ra medians were E = 1.69 µm, EG = 1.57 µm, C = 1.45 µm, and CG = 1.13 µm with p = 0.0284. The SE and VH were similar for all materials and treatments. Grinding smoothed the surfaces and did not significantly alter the hardness and surface energy of both LaMaV Press and IPS e-max Press. These glass-ceramics presented similar surface properties, and clinical adjustments can be implemented without loss of performance of both materials. A grinding standardization device developed that allowed to control the amount of grinding, the speed of rotation speed and the force exerted on the samples.
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Affiliation(s)
- Larissa Natiele Miotto
- Department of Dental Materials and Prosthodontics, School of Dentistry of Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil
| | | | - Edgar Dutra Zanotto
- Department of Materials Engineering, Vitreous Materials Laboratory, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil
| | - Eduardo Bellini Ferreira
- Department of Materials Engineering, São Carlos School of Engineering, University of São Paulo (USP), São Carlos, SP, Brazil
| | - Laiza Maria Grassi Fais
- Department of Dental Materials and Prosthodontics, School of Dentistry of Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil
| | - Lígia Antunes Pereira Pinelli
- Department of Dental Materials and Prosthodontics, School of Dentistry of Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil.
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S¸ivet Ö, Malkondu Ö, Küçükkurt S, Kazazoglu E. Evaluation of Changes in Temperature of Zirconia Frameworks During Grinding Under Different Chair-Side Conditions: An In Vitro Study. JOURNAL OF ADVANCED ORAL RESEARCH 2020. [DOI: 10.1177/2320206820953947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Aim: To evaluate the changes in the temperature of zirconia during grinding under different clinical conditions. Materials and Methods: A total of 60 zirconia framework specimens were fabricated and divided into groups of 10 specimens each. Two different handpieces, namely, a high-speed handpiece (HSH) and a low-speed handpiece (LSH), were used for grinding with and without water cooling. Fine- and coarse-grit diamond burrs were used with the HSH, separately. The following six groups were created: (a) HSH fine-grit with water cooling, (b) HSH coarse grit with water cooling, (c) HSH fine grit without water cooling, (d) HSH coarse grit without water cooling, (e) LSH with water cooling, and (f) LSH without water cooling. Each zirconia framework was ground until 1 mm3 of the material was removed. Temperature values corresponding to the grinding techniques were compared and statistically analyzed. One-way analysis of variance was used to compare the group parameters, while the Tukey honest significant difference test was used to detect significant differences between the groups. The significance level was set at P <.05. Results: The highest mean temperature was measured in the case of grinding with the LSH without water cooling (54.7 °C ± 11.6 °C), while the lowest mean temperature was observed in the case of grinding with the HSH using the coarse-grit diamond rotary instrument under water cooling (22.6 °C ± 0.6 °C). Conclusions: The grinding of zirconia must be performed with an HSH under water cooling. Further, when water cooling is used, neither the type of handpiece nor the grain type of the rotary instrument used as it has a significant effect on the temperature.
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Affiliation(s)
- Özgecan S¸ivet
- Department of Prosthodontics, Istanbul Aydın University, Istanbul, Turkey
| | - Özlem Malkondu
- Department of Prosthodontics, Yeditepe University, Istanbul, Turkey
| | - Sercan Küçükkurt
- Department of Oral and Maxillofacial Surgery, Istanbul Aydın University, Istanbul, Turkey
| | - Ender Kazazoglu
- Department of Prosthodontics, Yeditepe University, Istanbul, Turkey
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