Comparison of strains for new generation CAD-CAM implant-supported crowns under loading.

Yilmaz, Burak; Alsaery, Amani; Altintas, Subutay H; Schimmel, Martin (2020). Comparison of strains for new generation CAD-CAM implant-supported crowns under loading. Clinical implant dentistry and related research, 22(3), pp. 397-402. Wiley 10.1111/cid.12894

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PURPOSE

The behavior of implant-crowns fabricated from recently introduced CAD-CAM zirconia-reinforced lithium silicate ceramic (ZLS) or a hybrid ceramic containing resin-reinforced glass network (HC) for strains around the implant platform is not well-known. A force absorption capacity of the latter has been claimed by the manufacturer. The aim of this study was to measure and compare recently introduced ZLS and HC with commonly used CAD-CAM implant crown materials for strain distribution around the implant platform.

METHODS

Four implants (Legacy 1; Implant Direct) were placed into a resin block. Zirconia abutments (Straight contoured stock abutment; Implant Direct) were torqued into the implant fixtures to support crowns that were milled from a virtual design using four different CAD-CAM materials (Vita Suprinity PC (ZLS), Vita Enamix (HC), IPS Emax, ZirCAD Zirkonzahn) (N = 20). The crowns were cemented with a resin cement, loaded and strain values were recorded. Three-dimensional digital image correlation (3D-DIC) was used to measure compressive and tensile strains around the implant platforms. The tensile and compressive strains were recorded for each test and first analyzed for equality of variance using Levene's test, and further tested using a 2-way ANOVA repeated measures analysis of variance (α = .05).

RESULTS

The data analysis showed no statistically significant effect of crown material on the generated strains (P > .05). Compressive strains were significantly higher than the tensile strains (P < .05). One of the HC crowns fractured during loading.

CONCLUSIONS

Strains generated around implant platform when new generation CAD-CAM crown materials were used was similar to strains observed when CAD-CAM zirconia and lithium disilicate crowns were used. New generation crown materials did not have a significant load absorption effect to change or minimize the strains generated around the implant platform.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology

UniBE Contributor:

Yilmaz, Burak and Schimmel, Martin

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1708-8208

Publisher:

Wiley

Language:

English

Submitter:

Tina Lauper

Date Deposited:

03 Jul 2020 17:45

Last Modified:

03 Aug 2020 20:44

Publisher DOI:

10.1111/cid.12894

PubMed ID:

32253824

Uncontrolled Keywords:

CAD/CAM technology fixed implant prosthesis stress

BORIS DOI:

10.7892/boris.144816

URI:

https://boris.unibe.ch/id/eprint/144816

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