ALPEN Z-Rex Primal power harnessed

Zirconia diamonds

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Diamond instruments for zirconia and other high-performance ceramics

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Instrument Selection: Key to Long-Term Success

The popularity of zirconia and high-resistant ceramics restorations has been steadily increasing each year. Numerous studies have documented complication rates ranging from 5% to 16% after 5 years of utilizing zirconia and lithium disilicate restorations.1,2,3 The primary issues observed in zirconia oxide restorations are chipping and fractures, as zirconia is particularly prone to microcracks.1 Consequently, selecting appropriate instruments for adjusting is crucial to ensuring the longevity of your restorations.1,2,3 This is critical due to the potential impact on the physical properties of zirconia and the overall clinical success of the prosthesis. The selection of a bur, taking into account the necessary amount of occlusal adjustment, grinding efficiency, and the requirement for polishing, plays a pivotal role.12

Do you know which instruments are recommended for intraoral adjustments of zirconia?

Multiple studies have indicated that coarse diamond burs and carbides4,8,13,22 can compromise the zirconia structure, inducing microcracks6 on the surface and reducing its flexural strength5. The loading process may further propagate microcracks, leading to the fracture of zirconia restorations.14,16 Additionally, coarse instruments leave a rough surface that cannot be effectively polished with polishers10. This rough surface not only increases abrasion on opposing teeth11 but also retains bacteria.10

SEM pictures highlight that not all diamond burs for zirconia are suitable for zirconia adjusting, emphasizing the importance of choosing the right tools for optimal results.

Alpen Z-Rex Blue Grit

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Diatech_neue Bohrer_blau_1500(x1.5k)

Competitor Zirconia burs Green Grit

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Z-Rex Application

Intraoral and extraoral Adjustment

Our recommendation is to use Z-Rex with blue grit (M, 64 - 126 μm) for zirconia adjusting. These instruments have a less aggressive grit, resulting in a smooth zirconia surface without microcracks. 17 Following the adjustment, it is essential to polish the surface using polishers9,12 specifically designed for zirconia to increase flexural strength15 and reduce antagonistic enamel wear7,11. Polished monolithic zirconia crowns induce less wear on the opposing enamel compared to glazed monolithic zirconia crowns.21

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Endo Access and Crown Cutting

Use the green and blue Z-Rex for zirconia crown removal and round burs for creating endo access. Coarse green instruments might show improved efficiency over longer cutting periods (>5 min) than Medium instruments because of larger abrasive particles and a higher grit load on the substrate.23

Ensure adequate water cooling is consistently applied (at least 50ml/min).

Use low contact pressure 1.5N.

Do not surpass the recommended rotation speed.

We recommend using the Red Contra Angle due to its higher torque, which is required for crown cutting procedures.

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<span style="color:#fff;">Endo Access</span>
Endo Access
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<span style="color:#fff;">Crown Cutting</span>
Crown Cutting

Time to cut a 1 mm deep groove in a zirconia block

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Proven properties

The zircon burs Z-Rex with improved bonding achieved the best results. 18

Grinding Efficency

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Zirconia burs after five minutes of grinding

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Alpen

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Competitor 1

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What makes Z-Rex burs exceptionally unique?

ERA patented bonding20 ENHANCED RESILIENT ALLOY BONDING

COLTENE’s revolutionary Enhanced Resilient Alloy (ERA20) bonding has exceptional properties: The ERA matrix allows for improved embedding of diamonds. Additionally, the hardness (Vickers hardness) of the Enhanced Resilient Alloy is augmented by 70% compared to conventional bondings20. At the same time the toughness is increased significantly. All of these features lead to a reduced delamination of diamonds which results in higher durability and efficiency18.

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Unique Synthetic Diamond Mixture

Z-Rex burs feature two different synthetic grits, monocrystalline with regular shapes for increased durability, and polycrystalline with irregular, self-sharpening shapes to enhance grinding efficiency.

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Monocrystalline

Increased Service Life

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Polycrystalline

Increased Efficiency

Unique Synthetic Diamond Mixture

Z-Rex burs feature two different synthetic grits, monocrystalline with regular shapes for increased durability, and polycrystalline with irregular, self-sharpening shapes to enhance grinding efficiency.

monocrystalline-new

Monocrystalline

Increased Service Life

POLYCRYSTALLINE-new1

Polycrystalline

Increased Efficiency

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Experience the Advantages

Discover an exceptional blend of durability and efficiency, reducing the number of instruments needed for cutting zirconia.

Safe your restoration from microcracks during crown adjustment.

Shorten procedure time.

Enjoy the convenience of easily opening blister packaging.

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Explore Alpen's Zirconia Diamonds

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Diamond Burs Brochure

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(330) 916-8800

235 Ascot Parkway, Cuyahoga Falls, OH 44223