The grinding efficiency by diamond points developed for yttria partially stabilized zirconia

Ohkuma, Kazuo; Kazama, Miku; Ogura, Hideo

doi:10.4012/dmj.2010-152

Cited by 22 publications

(29 citation statements)

References 7 publications

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“…As reported previously , it was demonstrated that the cutting efficiency of diamond burs on Zir depended on the grain size. However, even though diamond burs with SC grains were used, an increase of the thickness of Zir significantly decreased the cutting depth.…”

Section: Discussionsupporting

confidence: 68%

“…Cutting force was determined according to a previous study conducted by Siegel and von Fraunhofer , who reported that the mean cutting force applied by dentists was 99.3 ± 23.4 g (corresponding to 0.97 ± 0.23 N). The cutting force of about 0.9 N was also used in other studies, in which cutting efficiency was evaluated in relation to dental settings . However, cutting torque was not evaluated and controlled in the present study.…”

Section: Discussionmentioning

confidence: 99%

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Cutting efficiency of diamond burs operated with electric high‐speed dental handpiece on zirconia

Nakamura

Katsuda

Ankyu

et al. 2015

European J Oral Sciences

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Zirconia-based dental restorations are becoming used more commonly. However, limited attention has been given to the difficulties experienced, concerning cutting, in removing the restorations when needed. The aim of the present study was to compare the cutting efficiency of diamond burs, operated using an electric high-speed dental handpiece, on zirconia (Zir) with those on lithium disilicate glass-ceramic (LD) and leucite glass-ceramic (L). In addition, evaluation of the cutting efficiency of diamond burs on Zir of different thicknesses was performed. Specimens of Zir were prepared with thicknesses of 0.5, 1.0, 2.0, and 4.0 mm, and specimens of LD and L were prepared with a thickness of 1.0 mm. Cutting tests were performed using diamond burs with super coarse (SC) and coarse (C) grains. The handpiece was operated at 150,000 rpm with a cutting force of 0.9 N. The results demonstrated that cutting of Zir took about 1.5- and 7-fold longer than cutting of LD and L, respectively. The SC grains showed significantly higher cutting efficiency on Zir than the C grains. However, when the thickness of Zir increased, the cutting depth was significantly decreased. As it is suggested that cutting of zirconia is time consuming, this should be taken into consideration in advance when working with zirconia restorations.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Cutting efficiency of diamond burs operated with electric high‐speed dental handpiece on zirconia

Nakamura

Katsuda

Ankyu

et al. 2015

European J Oral Sciences

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“…Zirconia can be processed by instruments coated with diamond abrasive grains because it has lower hardness than aluminum. It has been reported that higher grindability is achieved with larger diamond grains . However, the surface roughness is increased, so the rotary instrument should be changed sequentially from a large to small grain size of the diamond abrasives of the instrument.…”

Section: Discussionmentioning

confidence: 99%

“…Zirconia cores are often veneered with glass ceramics to achieve superior esthetics . More recently, monolithic full‐contour restorations have been fabricated using newly developed high‐translucency zirconia . Ceramic restorations routinely require occlusal and contour adjustments, resulting in a rough surface that may cause several problems, such as plaque accumulation, gingival inflammation, wear of the opposing teeth, and reduction of ceramic strength.…”

mentioning

confidence: 99%

Surface Roughness of Monolithic and Layered Zirconia Restorations at Different Stages of Finishing and Polishing: An In Vitro Study

Hamad

Al‐Addous

Al‐Wahadni

et al. 2019

Journal of Prosthodontics

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Purpose To evaluate surface roughness and topography of different zirconia‐based restorations at various steps of finishing and polishing. Materials and Methods Seventy‐five zirconia discs were fabricated and divided into 3 layered and 2 monolithic groups: layered conventional (VM9; Vita), layered pressed (PM9; Vita), layered digital (TriLuxe Forte; Vita), opaque monolithic (Ceramill Zi; Amann Girrbach), and translucent monolithic (Zolid FX; Amann Girrbach). Surface roughness testing (Ra, Rz) and scanning electron microscopy were performed at the glazed, unglazed, finished, polished, super‐polished, and super‐polished with diamond paste steps. One‐way ANOVA and Tukey tests were used for statistical analysis. Results There were significant differences in all groups among the different steps (p < 0.001, F = 77.67 for layered conventional; p < 0.001, F = 133.90 for layered pressed; p < 0.001, F = 47.94 for layered digital; p < 0.001, F = 48.05 for zirconia opaque; p < 0.001, F = 43.91 for zirconia translucent). For the layered groups, glazed stage was significantly different from all other steps (p < 0.001). For the layered conventional and digital groups, polishing using diamond paste was not significantly different from the polished and super‐polished steps (p = 0.448, p = 0.153), while for the layered pressed group, polishing using diamond paste was not significantly different from the super polished step (p = 0.815). For monolithic groups, there were no significant differences between the polished and super‐polished steps (p = 0.957 for zirconia opaque, p = 1.00 for zirconia translucent). Both the diamond paste and super‐polished steps showed no significant differences (p = 0.620, p = 0.550) from the glazed surface in the opaque zirconia group. Conclusions Surface roughness of monolithic and layered zirconia was improved by polishing; however, only opaque zirconia reached the level of surface roughness of the glazed stage. Type of buildup affected the surface roughness of adjusted ceramics, with monolithic zirconia showing lower surface roughness than layered zirconia. Polishing with diamond paste provided no significant improvement in the surface roughness of monolithic or layered zirconia.

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“…Ohkuma et al [5] tested diamond burs made by electrodeposition of diamond grains, with a larger diameter (200 µm) than that of traditional points (100 µm) designed to cut high strength ceramic material and found that yttria partially stabilized zirconia could be ground efficiently.…”

Section: Introductionmentioning

confidence: 99%

An Assessment of Burs Designed to Cut Zirconia

Millar¹

2017

OJST

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Objective: Zirconia is increasingly being used in restorative dentistry but its removal is often a difficult procedure due to its resistance to cutting with conventional diamond burs. Zirconia cutting burs have been developed and this study aims to compare 4 such burs. Methods: 35 experienced restorative dentists selected from our Practice Based Network (PBN) were asked to evaluate the cutting of a 1 mm groove into zirconia using 4 burs A (Meisinger), B (ZR2-1 experimental bur from DIATECH), C (Komet) & D (DIATECH Z-Rex, a bur designed with enhanced bonding of diamond grit to bur shank). Responses regarding cutting time, performance and wear were recorded. Results: For best cutting times and also overall performance D performed best and C the worst, with little difference between burs A and B. Bur C also performed least well for wear on the bur. Conclusion: The newly designed zirconia cutting bur DIATECH Z-Rex with enhanced bonding of diamond grit performed best in the analysis by the 35 dentists.

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The grinding efficiency by diamond points developed for yttria partially stabilized zirconia

Cited by 22 publications

References 7 publications

Cutting efficiency of diamond burs operated with electric high‐speed dental handpiece on zirconia

Cutting efficiency of diamond burs operated with electric high‐speed dental handpiece on zirconia

Surface Roughness of Monolithic and Layered Zirconia Restorations at Different Stages of Finishing and Polishing: An In Vitro Study

An Assessment of Burs Designed to Cut Zirconia

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