Multilayer resin material for dental milling and machining
US9839498B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2016 |
| Grant date | Dec 12, 2017 |
| Priority date | — |
| Expiry date | Nov 29, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C13/09
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
To provide a multilayer resin material for dental milling and machining, comprising an inorganic filler in a content of 40% by weight or more and a plurality of layers different in transparency and color tone from each other, wherein the thickness of the uppermost layer (U) and the thickness of the lowermost layer (L) are each 1 mm or more, the contrast ratios (uppermost layer: CU, lowermost layer: CL) as indices for the transparency of the uppermost layer (U) and the transparency of the lowermost layer (L) satisfy the following relations:0.30≦CU≦0.600.55≦CL≦0.90CU<CL and the chromaticities (uppermost layer: LU·aU·bU, lowermost layer: LU·aU·bL) based on the L*a*b* colorimetric system as the indices of the color tones in the uppermost layer (U) and the lowermost layer (L) satisfy the following relations:60≦LU·LL≦80−3≦aU·aL≦20≦bU·bL≦30
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.