CAD/CAM material selection and restoration design
We selected a restorative material that was fast and easy to process, financially accessible, and capable of offering pleasing optical and mechanical properties for reliable long-term performance: KATANA AVENCIA Block 2. It is manufactured by pressing ultra-fine filler particles into high-density blocks, uniformly impregnating the filler structure with resin monomer and then heat-polymerising the resin. According to the manufacturer, this production process results in particularly high wear resistance and restorations that are highly polishable and gentle on the opposing dentition.
KATANA AVENCIA Block 2 is offered in a multilayered version with natural colour gradation and in a high-translucency version designed for inlays and onlays requiring seamless optical integration. To evaluate the optical properties of the multilayered version, we decided to mill the restoration from a low-translucency block in Shade A2 as well as the multilayered version of KATANA AVENCIA Block 2 in the same shade, alongside comparable materials from other manufacturers.
For this purpose, the intra-oral scans taken after tooth preparation were exported into DentalCAD software (exocad; Fig. 17a). The onlay was designed in full contour, using a copy of the contralateral molar as a reference (Figs. 17b & c). The restoration was then milled from several materials. Afterwards, the milling sprues were removed and the surfaces polished with diamond burs and TWIST DIA for Composite (Kuraray Noritake Dental).
Definitive build-up and restoration placement
During the second appointment, the build-up and restoration were carried out. The temporary composite was removed quickly to avoid dehydration of the teeth and allow realistic evaluation of the onlays’ aesthetic properties. All the restorations were then tried in with glycerine gel and their appearance compared. The multilayered version of KATANA AVENCIA Block 2 in Shade A2 (Fig. 18a) produced an aesthetic result and blended in nicely with the surrounding tooth structure (Figs. 18b & c), and it was therefore selected for the definitive restoration.
The composite and the access cavity were then cleaned, and the composite was reactivated. To achieve this, the surface was air abraded with 30 μm silica-coated alumina powder (Fig. 19). This exposed remaining reactive sites in the resin matrix and produced a clean, roughened, silica-coated surface to support micromechanical and chemical bonding of the restorative material and the definitive restoration.
CAD/CAM material selection and restoration design
We selected a restorative material that was fast and easy to process, financially accessible, and capable of offering pleasing optical and mechanical properties for reliable long-term performance: KATANA AVENCIA Block 2. It is manufactured by pressing ultra-fine filler particles into high-density blocks, uniformly impregnating the filler structure with resin monomer and then heat-polymerising the resin. According to the manufacturer, this production process results in particularly high wear resistance and restorations that are highly polishable and gentle on the opposing dentition.
KATANA AVENCIA Block 2 is offered in a multilayered version with natural colour gradation and in a high-translucency version designed for inlays and onlays requiring seamless optical integration. To evaluate the optical properties of the multilayered version, we decided to mill the restoration from a low-translucency block in Shade A2 as well as the multilayered version of KATANA AVENCIA Block 2 in the same shade, alongside comparable materials from other manufacturers.
For this purpose, the intra-oral scans taken after tooth preparation were exported into DentalCAD software (exocad; Fig. 17a). The onlay was designed in full contour, using a copy of the contralateral molar as a reference (Figs. 17b & c). The restoration was then milled from several materials. Afterwards, the milling sprues were removed and the surfaces polished with diamond burs and TWIST DIA for Composite (Kuraray Noritake Dental).
Definitive build-up and restoration placement
During the second appointment, the build-up and restoration were carried out. The temporary composite was removed quickly to avoid dehydration of the teeth and allow realistic evaluation of the onlays’ aesthetic properties. All the restorations were then tried in with glycerine gel and their appearance compared. The multilayered version of KATANA AVENCIA Block 2 in Shade A2 (Fig. 18a) produced an aesthetic result and blended in nicely with the surrounding tooth structure (Figs. 18b & c), and it was therefore selected for the definitive restoration.
The composite and the access cavity were then cleaned, and the composite was reactivated. To achieve this, the surface was air abraded with 30 μm silica-coated alumina powder (Fig. 19). This exposed remaining reactive sites in the resin matrix and produced a clean, roughened, silica-coated surface to support micromechanical and chemical bonding of the restorative material and the definitive restoration.
