The effects of dental grinding and sandblasting on ageing and fatigue behavior of dental zirconia (Y-TZP) ceramics

Kosmač, Tomaž; Oblak, Čedomir; Marion, Ljubo

doi:10.1016/j.jeurceramsoc.2007.09.013

Cited by 163 publications

(147 citation statements)

References 23 publications

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“…defining the final outcome: if the balance tends to the introduction of defects it may be observed a negative impact (8,9,24), while if the balance favors phase transformation it could be observed the toughening mechanism (12,13,19). Our study corroborates that assumption, since we used the methodology preconized by this systematic review (14) to avoid defect introduction (handpieces coupled to slow speed motors and the use of plenty coolant) and we did not notice a deleterious effect, even using coarse diamond burs during grinding.…”

Section: Fatigue Strength Of Ground and Aged Y-tzpmentioning

confidence: 99%

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Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

et al. 2018

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This study aimed to investigate the effect of grinding and multi-stimuli aging on the fatigue strength, surface topography and the phase transformation of Y-TZP ceramic. Discs were manufactured according to ISO-6872:2008 for biaxial flexure testing (diameter: 15 mm; thickness: 1.2 mm) and randomly assigned considering two factors "grinding" and "aging": C-control (as-sintered); CA-control + aging; G-ground; GA-ground + aging. Grinding was carried out with coarse diamond burs under water-cooling. Aging protocols consisted of: autoclave (134°C, 2 bars pressure, 20 hours), followed by storage for 365 days (samples were kept untouched at room temperature), and by mechanical cycling (10 6 cycles by 20 Hz under a load of 50% from the biaxial flexure monotonic tests). Flexural fatigue strengths (20,000 cycles; 6 Hz) were determined under sinusoidal cyclic loading using staircase approach. Additionally, surface topography analysis by FE-SEM and phase transformation analysis by X-ray Diffractometry were performed. Dixon and Mood methodology was used to analyze the fatigue strength data. Grinding promotes alterations of topographical pattern, while aging apparently did not alter it. Grinding triggered t-m phase transformation without impacting the fatigue strength of the Y-TZP ceramic; and aging promoted an intense t-m transformation that resulted in a toughening mechanism leading to higher fatigue strength for as-sintered condition, and a tendency of increase for ground condition (C < CA; G = GA). It concludes that grinding and aging procedures did not affect deleteriously the fatigue strength of the evaluated Y-TZP ceramic, although, it promotes surface topography alterations, except to aging, and t-m phase transformation. Effect of Grinding and Multi-S t i m u l i A g i n g o n t h e F a t i g u e S t r e n g t h o f a Y-T Z P C e r a m i c

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Section: Fatigue Strength Of Ground and Aged Y-tzpmentioning

confidence: 99%

“…All of those conditions might allow LTD to take place and until now few studies evaluated the fatigue strength of Y-TZP ceramic after stimuli that simulate some oral environment aging conditions (especially considering the combination of stimuli) (7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

et al. 2018

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“…AS, ST and ET specimens show the same aging behavior, meaning that the thermal treatment at 1450 ºC removes any previous change in the surface that could affect its response to LTD. S specimens showed enhanced aging resistance with respect to the control ones, because of the compressive stresses introduced at the surface as a consequence of plastic deformation (Chintapalli, 2012;Kosmač, 2008), while E samples had poorer aging resistance. Since the monoclinic phase content of these two sets of samples was similar before artificial degradation (approximately 12 %), the higher monoclinic phase content of degraded E samples must be related to the lack of superficial compressive stresses plus, probably, the depletion of ions in superficial grains from the acid attack.…”

Section: Protection From Degradation In Infiltrated Samplesmentioning

confidence: 99%

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 3 During mechanical modification of the surface by sandblasting, local phase transformation may take place, which may induce damage as well as compressive forces as a result of the local volume increase associated with the transformation. The sole sandblasting may increase or decrease the strength depending on the tradeoff between the effect of the surface compressive layer resulting from the process and the characteristics of the additional surface defects introduced (Chintapalli et al, 2014;Kosmač, 2008). It is important to underline that the compressive stresses disappear if a heat treatment is performed after sandblasting, as it happens during the veneering process, due to reconversion of the monoclinic layer and stress release.…”

Section: Introductionmentioning

confidence: 99%

“…Since the aging behavior of zirconia of sandblasted plus annealed specimens is similar to sintered plus polished specimens, the lower LTD in the sandblasted state must be related to the superficial compressive layer and the local plastic deformation generated. (Chintapalli, 2012;Kim et al, 2010;Kosmač, 2008). Nevertheless, specimens obtained maximizing the strength by choosing optimum sandblasting conditions, may suffer a drop in strength after artificial degradation, being the drop severe after long and aggressive aging treatments (Chintapalli, 2012;Kosmač, 2008;Papanagiotou et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Surface roughened zirconia: towards hydrothermal stability

Camposilvan

Flamant

Anglada

2015

Journal of the Mechanical Behavior of Biomedical Materials

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Surface roughness is needed in several yttria-stabilized zirconia components used in restorative dentistry for osseointegration or adhesion purposes. This can be achieved by different treatments, which may also modify the microstructure of the surface. Among them, sandblasting and chemical etching are widely used, but their effect on hydrothermal aging of zirconia is not fully understood. In the present work, the zirconia long-term stability of rough surfaces prepared by these techniques is analyzed and a method is proposed for preventing hydrothermal aging while maintaining the original surface appearance and mechanical properties. The method involves pressure infiltration of a Cerium salt solution on the roughened surfaces followed by a thermal treatment. The solution, trapped by surface defects and small pores, is decomposed during thermal treatment into Cerium oxide, which is diffused at high temperature, obtaining Ce co-doping in the near-surface region.In addition, the microstructural changes induced in the near-surface by sandblasting or chemical etching are removed by the thermal treatment together with surface defects. No color modification was observed and the final roughness parameters were in the range of existing implants of proved good osseointegration. The aging resistance of Ce co-doped materials was strongly enhanced, showing the absence of aging after artificial degradation, increasing in this way the surface mechanical integrity.The proposed treatment is easily applicable to the current manufacturing procedures of zirconia dental posts, abutments, crowns and dentures, representing a solution to hydrothermal aging in these and other biomedical applications.

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3D Printing of Diamond Tools for Dental Ceramics Processing

Yang

et al. 2017

Adv Eng Mater

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This paper is focused on preparing diamond tools with orderly arranged abrasive particles for dental ceramics processing via 3D printing. This allows one to overcome such drawbacks of the existing methods of dental ceramics processing as weak bonding strength, short service life, and irregular diamond distribution in diamond tools. Firstly, the CAD model of the dental diamond tool is constructed using 3D cartographic software, with level-scanpath geometry information generated via hierarchcal slicing. Then, using Ni-Cr alloy powder and diamond as raw materials, the dental ceramics processing diamond tool with orderly arranged diamond particles is prepared via a 3D printer. Next, an X-ray diffractometer, energy dispersive spectrometer, and scanning electron microscope are used to analyze the microstructure of the Ni-Cr alloy and diamond particle interfaces, resulting in the identification of their bonding mechanism. Finally, the diamond grinding wheel produced by 3D printing is subjected to dental zirconia ceramics grinding performance tests. The results obtained confirm that diamond particles experience normal wear, while no abrasive falling off occurs on the 3D printed diamond tool surface.

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The effects of dental grinding and sandblasting on ageing and fatigue behavior of dental zirconia (Y-TZP) ceramics

Cited by 163 publications

References 23 publications

Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

Effect of Grinding and Multi-Stimuli Aging on the Fatigue Strength of a Y-TZP Ceramic

Surface roughened zirconia: towards hydrothermal stability

3D Printing of Diamond Tools for Dental Ceramics Processing

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