Scientific Studies

BruxZir® Scientific Studies

The comprehensive reports that follow evaluate the integrity and performance of BruxZir® Solid Zirconia. Biomaterials research, university studies and clinician reports were completed in order to examine how well a variety of materials embody the characteristics vital to high-quality dental restorations. Performance assessments, including long-term data, show that BruxZir restorations are excellent alternatives to PFMs and cast gold restorations. Furthermore, tests that evaluate strength, wear and translucency affirm the advantages of BruxZir Solid Zirconia compared to other all-ceramic restorations.

Zirconia: Most Durable Tooth-Colored Crown Material in 8-year practice-based clinical Study

Gordon J. Christensen Clinicians Report®

BruxZir® Full-Strength Solid Zirconia best meets TRAC Research’s seven sought-after characteristics of the 200 tooth-colored materials studied thus far in the foundation’s 40-year history. In this comparative 8-year clinical study, BruxZir Full-Strength Solid Zirconia exhibited zero terminal fractures, demonstrated excellent tolerance to clinical abuse, and did not wear opposing dentition excessively.

An independent, nonprofit, dental education and product testing foundation, Clinicians Report®, November, 2018. 

BruxZir Solid Zirconia Crowns and Bridges 5-year Clinical Performance Report

The Dental Advisor

Conclusions: Over the five-year evaluation period, BruxZir Solid Zirconia Crowns and Bridges has proven to be an excellent restoration with respect to esthetics and dependability. It is highly recommended for posterior crowns and three- and four-unit bridges as well as implant-supported crowns and bridges. In select cases, it can be used confidently for anterior restorations. It received a 97% clinical rating.

Resistance to fracture or chipping
Resistance to marginal discoloration
Wear Resistance

Full-Strength BruxZir Zirconia Formulation in Molar Crowns at 6 Years of Clinical Service

Gordon J. Christensen Clinicians Report

BruxZir Full-Strength is the most durable of 118 white materials studied in clinical trials performed by Gordon J. Christensen Clinicians Report® in the past 40 years. A six-year clinical study of BruxZir Full-Strength used on molar crowns had a fracture rate of zero percent. The BruxZir cases received minimal tooth preparation (less than 1.0 mm occlusal reduction with a slight chamfer margin), RMGI cementation, and were placed on subjects with bruxing/clenching habits.

BruxZir Solid Zirconia: Superior Clinical Performance at 3+ Years

Gordon J. Christensen Clinicians Report

The clinical performance of BruxZir molar crowns was superior to all other tooth-colored materials studied previously by the TRAC research division of Clinicians Report® over the course of 39 years. Based on scanning electron microcoscope (SEM), clinical and laboratory examinations performed three-and-a-half years after placement, BruxZir crowns exhibited 23 percent less wear than the pressed ceramic-over-zirconia control group. Over the course of the study, BruxZir crowns received more wear than they caused, with no reports of microcracks, surface cratering or adverse occlusal system effects.

Translucency of CAD/CAM Ceramics

The Dental Advisor

Specimens of the zirconia products were more translucent at 0.5 mm thickness than at 1.0 mm thickness. At the 0.5 mm thickness, the translucency parameter ranged from 10.3 to 10.7, and BruxZir was significantly more translucent than the other three products. At the 1.0 mm thickness, the translucency parameter ranged from 7.1 to 7.8, and BruxZir was significantly more translucent than Zenostar® Zr and Lava Plus. Translucency parameter was a function of wavelength when measured between 360–750 nm in reflection.

Zirconia vs. Porcelain Wear Study

J Adv Prosthodont 2010;2:111-5

Although conventional belief might suggest that zirconia’s high fracture strength and surface hardness would cause a greater degree of wear on enamel, a recent study found that the degree of wear on the opposing tooth was actually four times greater in dental porcelain than in polished, unglazed zirconia, suggesting that zirconia restorations are not only more fracture-resistant than porcelain restorations, but also gentler in their functional interaction with natural dentition.

BruxZir vs. Ceramco® 3 — A Comparative Wear Study

University Hospital Tübingen

BruxZir Solid Zirconia and Ceramco 3 were recently tested in a comparative wear study. Each material was tested using the Willytech Chewing Simulator, which simulated the clinical performance of the material over a period of five years. After 1.2 million wear cycles under a load of 5 kg, BruxZir compared favorably to Ceramco 3 with barely detectable wear.

BruxZir vs. IPS e.max® Enamel Wear Test

S.Shah, C.Michelson, P.Beck, L.C.Ramp, D.Cakir and J.Burgess

Some dentists are concerned about the wear of enamel when opposing BruxZir full-contour zirconia crowns and bridges. In a recent study to measure the volumetric loss of enamel, glazed BruxZir was found to cause less enamel wear than glazed IPS e.max®.

Natural Enamel
0.29 ± 0.12 mm3
Glazed BruxZir
0.37 ± 0.23 mm3
Glazed IPS e.Max
0.41 ± 0.15 mm3

The Translucency of BruxZir Solid Zirconia

BruxZir materials exhibit higher light transmission resulting in a more natural shade value. The BruxZir Full-Strength zirconia powder composition results in restorations with improved optical transmission, homogeneity of color, heightened strength and a more precise fit in multi-unit restorations. The translucency of BruxZir Esthetic zirconia is superior to that of other zirconias. Exhibiting high translucency in the warm color wavelengths, BruxZir Esthetic zirconia results in more lifelike restorations for patients.

BruxZir Translucency Chart
BruxZir Esthetic Translucency Chart

Scanning Electron Microscope Images

SEM of sintered colloidally processed BruxZir Full-Strength Solid Zirconia vs. sintered isostatically pressed zirconia. The 50 percent smaller average grain size and colloidal processing of BruxZir Full-Strength zirconia improves its physical properties and esthetics.

High Flexural Strength

Lithium Disilicate ceramics have 500 MPa and typical zirconia materials have a flexural strength of more than 1,150 MPa. However, because of post-powder processing, BruxZir Solid Zirconia dental restorations are able to exceed that strength threshold, with flexural strengths up to 1,465 MPa.