Abstract
BackgroundDifferent CAD/CAM machines’ generation may impact the restoration overall quality. The present study evaluated the marginal fit of CAD/CAM restorations manufactured with different generations of CEREC milling unit systems.Material and MethodsSixteen typodont teeth were divided into two groups (n=8) according to the machine’s generation assigned. These are control group (G1): Cerec AC with Bluecam/Cerec 3 milling unit and (G2): Cerec AC with Bluecam/MC XL Premium Package milling unit. Scanning of the preparation were performed and crowns were milled using the Vita Mark II blocks. Blocks were cemented using epoxy glue on the pulpal floor only and finger pressure applied for 1 min. Upon completion of the cementation step, misfits between the restoration and abutment were measured by microphotography and the silicone replica technique using light body silicon material on Mesial (M) and Distal (D) surfaces.ResultsMean and SDs of marginal gaps in micrometers were: G1/M: 94.90 (±38.52), G1/D: 88.53 (±44.87), G2/M: 85.65 (±29.89), G2/D: 95.28 (±28.13). Two-way ANOVA indicated no significant differences among different groups (P>0.05); surface area (P>0.05) and the interaction (P>0.05). Overall, G2 had greater margin gaps than G1, however, without statistical difference (P>0.05).ConclusionsDifference in milling unit generation did not significantly affect the marginal fit. Marginal gap means were in the range of the clinical acceptance levels for both generations of Cerec milling units, regardless the teeth site area. Key words:CAD/CAM, margin, ceramics.
Highlights
Cerec CAD/CAM machines are currently used to manufacture ceramic restorations based on computer-assisted design and produce a restoration on a single dental appointment
The present study was designed to compare and evaluate the marginal fit of ceramic CAD/CAM ceramic restorations produced with the Cerec AC using BlueCam and milled with different Cerec milling generations: i) Cerec 3 Milling unit (Cerec3) and ii) Cerec MC XL Premium Package (MCXLPP) milling unit
We determined whether the marginal fit would be affected by the different milling unit used, and second, we examined if the different regions of the tooth differ in terms of marginal fit, regardless of the milling unit used
Summary
Cerec CAD/CAM machines are currently used to manufacture ceramic restorations based on computer-assisted design and produce a restoration on a single dental appointment These restorations, commonly made with ceramic material, are becoming increasingly popular worldwide [1,2,3,4]. The present study was designed to compare and evaluate the marginal fit of ceramic CAD/CAM ceramic restorations produced with the Cerec AC using BlueCam and milled with different Cerec milling generations: i) Cerec 3 Milling unit (Cerec3) and ii) Cerec MC XL Premium Package (MCXLPP) milling unit. The present study evaluated the marginal fit of CAD/CAM restorations manufactured with different generations of CEREC milling unit systems. Marginal gap means were in the range of the clinical acceptance levels for both generations of Cerec milling units, regardless the teeth site area
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