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Clinical Oral Investigations

Published in:

01-03-2017 | Original Article

Trueness of four different milling procedures used in dental CAD/CAM systems

Authors: Corinna Kirsch, Andreas Ender, Thomas Attin, Albert Mehl

Published in: Clinical Oral Investigations | Issue 2/2017

Abstract

Objectives

Milling is a crucial step in producing restorations using computer-aided design and computer-aided manufacturing (CAD/CAM) systems. In this study the trueness of currently available milling devices was evaluated.

Materials and methods

Thirty clinical cases (ten inlays, ten crowns, ten onlays) were milled from ceramic blocks using four different milling approaches: five axis with IMES CORiTEC 450i, four axis with CEREC MCXL, four axis with CEREC MCXL-EF and five axis with inLab MCX5. The milled restorations were scanned and the occlusal and inner surfaces compared to the originally calculated 3D surface using difference analysis software. The (90–10 %) / 2 percentile of the distances were calculated and analysed using one-way ANOVA with the post hoc Scheffé test (α = 0.05). Chipping of marginal areas were visually examined and analysed using one-way ANOVA with a post hoc Tamhane test (α = 0.05).

Results

At inner surfaces, the milling trueness of IMES (33.9 ± 16.3 μm), X5 (32.3 ± 9.7 μm) and MCXL-EF (34.4 ± 7.5 μm) was significantly better (p < 0.001) than that of MCXL (62.1 ± 17.1 μm). At occlusal surfaces, MCXL-EF (25.7 ± 9.3 μm) showed significant higher accuracy (p < 0.001) than MCXL (48.7 ± 23.3 μm) and X5 (40.9 ± 20.4 μm). IMES produced the most chipping (p < 0.001).

Conclusions

Five-axis milling devices yield high trueness. MCXL-EF is competitive and may allow chairside fabrication with good milling results.

Clinical relevance

Accurate milling is required for well-fitting restorations and thereby requires fewer manual finishing steps, yields smaller marginal gaps, resistance to secondary caries and longevity of restorations.

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Title: Trueness of four different milling procedures used in dental CAD/CAM systems
Authors: Corinna Kirsch
Andreas Ender
Thomas Attin
Albert Mehl
Publication date: 01-03-2017
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 2/2017
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-016-1916-y

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Trueness of four different milling procedures used in dental CAD/CAM systems

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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