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Trueness of four different milling procedures used in dental CAD/CAM systems by Corinna Kirsch; Andreas Ender; Thomas Attin; Albert Mehl is a Dentistry article available to read on EtoBox.

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## 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 acc

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Author

Corinna Kirsch; Andreas Ender; Thomas Attin; Albert Mehl

Publisher

Springer Science and Business Media LLC

Published

2016

Language

EN

Field

Dentistry (Health Sciences)