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Sains Malaysiana 53(1)(2024): 217-229
http://doi.org/10.17576/jsm-2024-5301-17
Evaluation
and Comparison of Mechanical Properties of Lithium Disilicate-Based
CAD/CAM Blocks
(Penilaian dan Perbandingan Sifat Mekanikal Blok
CAD/CAM Berasaskan Litium Disilikat)
SOFYA ZULKIFFLI, YEOH OON TAKE*, NOOR AZLIN YAHYA & MURALITHRAN
GOVINDAN KUTTY
Department
of Restorative Dentistry, Faculty of Dentistry, Universiti Malaya, 50603
Kuala
Lumpur, Malaysia
Received: 23 September
2023/Accepted: 26 December 2023
Abstract
Lithium disilicate are commonly used in dental restoration due to its aesthetic and mechanical
performance. However, the patent expiration of the IPS emax system has led to the emergence of other variations of the system. Data and
studies concerning mechanical properties of these recent lithium disilicate-based CAD/CAM are scarce and it warrants for an
investigation to provide scientific evidence to support its routine use. The
aim of this study was to investigate and compare the mechanical properties of
lithium disilicate-based CAD/CAM blocks from four
different brands. Four CAD/CAM lithium disilicate brands were investigated; IPS emax, Mazic Claro, Cameo, and Tessera.
Specimens (n=10) were prepared accordingly; for flexural strength (16 × 4 × 1.2
mm) and microhardness test (15 × 13 × 2 mm). One
specimen from each brand was analysed for the microstructure, elemental
composition and distribution before and after heat treatment using scanning
electron microscope and energy dispersive x-ray spectroscopy. The three-point
flexural strength test (n=10) and microhardness test
(n=10) was performed. Data were analysed using one-way ANOVA and Dunnett’s T3 test. The results showed that the highest mean
flexural strength was from Group 4 Tessera (540.52 ±
143.33 MPa). For microhardness, the highest mean was
from Group 1 Mazic Claro (667.70 ± 9.41 HV). Within
the four groups, statistically significant difference is noted for flexural
strength and microhardness. As a conclusion, Tessera demonstrated significantly higher flexural strength
than IPS emax and Cameo. Mazic and Tessera demonstrated significantly higher microhardness than IPS emax and
Cameo. All materials tested were above the threshold of 300 MPa.
Keywords: CAD/CAM; flexural strength; lithium disilicate; microhardness;
microstructure
Abstrak
Litium disilikat kerap digunakan dalam rawatan pergigian disebabkan sifat mekanikal dan estetiknya yang memberangsangkan. Paten IPS emax CAD tamat tempoh membawa kepada kemunculan variasi lain. Walau bagaimanapun, data dan kajian mengenai sifat mekanikal CAD/CAM litium disilikat baru-baru ini adalah terhad dan ia memerlukan kajian demi menyediakan bukti saintifik untuk menyokong penggunaan hariannya. Matlamat kajian ini adalah untuk membandingkan sifat mekanikal blok CAD/CAM litium disilikat daripada empat jenama berbeza. Empat jenama CAD/CAM litium disilikat telah dikaji; IPS emax, Mazic Claro, Cameo dan Tessera. Spesimen (n = 10) disiapkan mengikut dimensi; untuk kekuatan lentur (16 × 4 × 1.2 mm) dan ujian mikrokekerasan (15 × 13 × 2 mm). Satu spesimen daripada setiap jenama dianalisis untuk struktur mikro, komposisi unsur dan pengedaran sebelum dan selepas rawatan haba menggunakan Mikroskop Elektron Pengimbasan dan spektroskopi sinar-x penyebaran Tenaga. Ujian kekuatan lentur tiga mata (n=10) dan ujian mikrokekerasan (n=10) telah dilakukan.
Data dianalisis menggunakan ANOVA sehala dan ujian pasca hoc T3 Dunnett. Keputusan menunjukkan purata kekuatan lenturan tertinggi adalah daripada Kumpulan 4 Tessera (540.52 ± 143.33 MPa). Untuk kekerasan mikro, min tertinggi ialah daripada Kumpulan 1 Mazic Claro (667.70 ± 9.41 HV). Dalam empat kumpulan, perbezaan ketara secara statistik dicatatkan untuk kekuatan lentur dan kekerasan mikro. Secara kesimpulan, Tessera menunjukkan kekuatan lenturan yang lebih tinggi daripada IPS emax dan Cameo. Mazic dan Tessera menunjukkan kekerasan mikro yang lebih tinggi daripada IPS emax dan Cameo. Semua bahan yang diuji melebihi ambang 300 MPa.
Kata kunci: CAD/CAM; kekerasan mikro; kekuatan lentur; litium disilikat; struktur mikro
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*Corresponding author; email: yotumdental@um.edu.my
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