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VOLUME 22 , ISSUE 12 ( December, 2021 ) > List of Articles


Light Transmission for a Novel Chairside CAD/CAM Lithium Disilicate Ceramic

Carlos A Jurado, Clarisa Amarillas-Gastelum, Akimasa Tsujimoto, Saad Alresayes, Kennedee French, Hamid Nurrohman

Keywords : CAD/CAM, Ceramics, Light transmission, Lithium disilicate, Polishing, Thickness

Citation Information : Jurado CA, Amarillas-Gastelum C, Tsujimoto A, Alresayes S, French K, Nurrohman H. Light Transmission for a Novel Chairside CAD/CAM Lithium Disilicate Ceramic. J Contemp Dent Pract 2021; 22 (12):1365-1369.

DOI: 10.5005/jp-journals-10024-3239

License: CC BY-NC 4.0

Published Online: 10-05-2022

Copyright Statement:  Copyright © 2021; The Author(s).


Aim: To evaluate light transmission in a novel chairside CAD/CAM lithium disilicate ceramic with different thicknesses and with and without polishing. Materials and methods: Sixty flat samples (10 specimens/group) were fabricated from novel chairside CAD/CAM lithium disilicate ceramic blocks (Amber Mill, Hass Bio) with different thicknesses and with and without polishing as follows: (1) 1.0 mm thickness without polishing (1.0NoP); (2) 1.0 mm thickness with polishing (1.0Po); (3) 1.5 mm thickness without polishing (1.5NoP); (4) 1.5 mm thickness with polishing (1.5Po); (5) 2.0 mm thickness without polishing (2.0NoP); and (6) 2.0 mm thickness with polishing (2.0Po). Specimens were polished with a polishing system for lithium disilicate restorations following the manufacturer's recommendations. Light transmission was evaluated with a curing radiometer. Obtained data were subjected to two-way ANOVA followed by Tukey's post hoc tests (α = 0.05). SEM observations were conducted to evaluate surface microstructure. Results: The light intensity through the lithium disilicate blocks with and without polishing was 200.9 mW/cm2 (16.1%) and 194.4 mW/cm2 (15.6%) for 1.0 mm specimens, 119.3 mW/cm2 (9.5%) and 111.9 mW/cm2 (9.0%) for 1.5 mm specimens, and 102.3 mW/cm2 (8.2%) and 96.0 mW/cm2 (7.7%) for 2.0 mm specimens. SEM images showed a smoother surface with polishing compared to nonpolished specimens. Conclusion: The thickness and polishing of the restorations were both significant influential factors in light transmission. Clinical significance: The range of light transmission percentage through the novel chairside CAD/CAM lithium disilicate blocks was 7.7–16.1%, suggesting that light attenuation through the material may influence the polymerization reaction of resin luting cement in the bonding process.

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