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. 2022 Jan 4;58(1):75.
doi: 10.3390/medicina58010075.

Light Transmission of Various Aesthetic Posts at Different Depths and Its Effect on Push-Out Bond Strength, Microhardness of Luting Cement

Satheesh B Haralur  1 , Turki Abdullah Alasmari  2 , Mohammed Hussin Alasmari  2 , Hafiz Mohammed Hakami  2
Affiliations

Light Transmission of Various Aesthetic Posts at Different Depths and Its Effect on Push-Out Bond Strength, Microhardness of Luting Cement

Satheesh B Haralur et al. Medicina (Kaunas). .

Abstract

Background and Objectives: One requirement for the cemented post is the light transmittance on its entire length up to the deepest portion of a root canal to ensure the complete polymerization of resin cement. This study aimed to determine the light transmission ability in different aesthetic posts at different depths and its effect on the push-out bond strength and microhardness of luting cement at the corresponding interface. Materials and Methods: Twenty endodontic posts from glass fiber posts (GFP), zirconia ceramic posts (ZCP), and highly translucent zirconium oxide posts (HTZP) were sequentially sectioned into 12.8 and 4 mm lengths after recording the light intensity using a dental radiometer. Sixty single rooted premolar teeth root canals were treated and implanted vertically in a resin block. The post space was prepared and cemented with GFP, ZCP, and HTZP posts with twenty samples each. The root portion of teeth samples were sectioned into cervical, middle, and apical portion. A universal testing machine was utilized for the push-out bond strength test for the first ten samples from each group. The remaining ten samples from each group were used for the microhardness test using a micro-indenter instrument. The data were statistically analyzed using one-way Analysis of variance and Tukey HSD tests at p < 0.05. Results: The GFP endodontic postpresented with significant highest light translucency compared to HTZP, which was significantly higher than ZCP. GFP posts showed significantly higher bond strength per unit area compared to ZCP at analogous cross sections. The hardness of luting cement was also significantly higher amongst all tested endodontic posts. Conclusions: GFP high light translucency enhanced the curing of the luting resin cement that resulted in harder cement and a stronger bond supported by hardness and push-out tests. These findings suggest that GFP is preferred to be used with light-cured luting cements for restoration of endodontically treated teeth.

Keywords: fiber-reinforced composite post; highly translucent zirconia; light translucency; microhardness; push-out bond strength; zirconia ceramic post.

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Conflict of interest statement

Authors declare that there are no conflict of interest.

Figures

Figure 1
Figure 1
Schematic illustration of the Light transmission measurement process.
Figure 2
Figure 2
Push-out test and microhardness methodology flowchart.
Figure 3
Figure 3
Microhardness testing on the teeth sample.
Figure 4
Figure 4
Push-out bond strength testing on universal testing machine.
Figure 5
Figure 5
Mean light intensity (mW/cm²) among the different post at various depth. HTZP: highly translucent zirconium oxide posts; GFP: glass fiber posts; ZCP: zirconia ceramic posts.
Figure 6
Figure 6
Mean and standard deviations (MPa) of push-out bond strength and hardness (HV) of luting cement.
See this image and copyright information in PMC

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