Abstract
Statement of problem
Despite the acceptable physical properties of biocompatible high-performance polymer
(BioHPP), little is known about the marginal accuracy and fracture strength of restorations
made from this material.
Purpose
This in vitro study assessed the marginal and internal adaptation and fracture strength
of teeth restored with lithium disilicate (LD) ceramics and BioHPP monolithic crowns.
Material and methods
Twenty-four extracted premolars were prepared for complete coverage crowns and divided
into 2 groups to receive pressed IPS e.max LD, or computer-aided design and computer-aided
manufacturing (CAD-CAM) BioHPP monolithic crowns. After adhesive cementation, the
marginal and internal adaptations of the restorations were evaluated by microcomputed
tomography at 18 points for each crown. Specimens were subjected to 6000 thermal cycles
at 5 °C and 55 °C and 200 000 load cycles of 100 N at a frequency of 1.2 Hz. The fracture
strength of the restorations was then measured in a universal testing machine at a
crosshead speed of 0.5 mm/min. Data were analyzed via an independent-sample t-test (α=.05).
Results
The mean ±standard deviation of marginal gap was 138.8 ±43.6 μm for LD and 242.1 ±70.7
μm for BioHPP groups (P=.001). The mean ±standard deviation value of absolute marginal discrepancy was 193.8
±60.8 μm for LD and 263.5 ±97.6 μm for BioHPP groups (P=.06). The internal occlusal and axial gap measurements were 547.5 ±253.1 μm and 197.3
±54.8 μm for LD (P=.03) and 360 ±62.9 μm and 152.8 ±44.8 μm for BioHPP (P=.04). The mean ±standard deviation of internal space volume was 15.3 ±11.8 μm³ for
LD and 24.1 ±10.7 μm³ for BioHPP (P=.08). The mean ±standard deviation of fracture strength was 2509.8 ±680 N for BioHPP
and 1090.4 ±454.2 MPa for LD groups (P<.05).
Conclusions
The marginal adaptation of pressed lithium disilicate crowns was better, while BioHPP
crowns displayed greater fracture strength. Marginal gap width was not correlated
with fracture strength in either group.
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Article info
Publication history
Published online: May 17, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by the Research Center through the Dentistry Research Institute at Tehran University of Medical Sciences, Tehran, Iran [99-3-134-49290; 99-3-134-49296].
Identification
Copyright
© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
