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

Objectives: Resin cements are light polymerized, but the light may not reach all areas of root canals. The purpose of this study was to determine the best predictor of transmitted light radiant exposure (TLRE) from posts' sides.Materials and Methods: Fiber posts were placed in a custom-made apparatus and advanced by 1-mm increments. The LED curing probe tip was activated for 40 s on the coronal end of the post. The TLRE was measured with an LED radiometer detector positioned on the side of the post exposed by an opening in the apparatus. Hierarchical multiple linear regression analysis was performed. Results: Post system explained an additional 23.62% of the variation in TRLE. Adding actual post diameter explained an additional 62.64% of the variation in TRLE. While adding post length explained an additional 0.67%.Changing post system from FiberKleer to Postec Plus will decrease the mean value of TRLE by 4.90 units on average. Also, a one-unit increase of actual post diameter and length will decrease the value of TRLE by 44.96 and 0.44 units respectively. The TLRE ranged from 46 to 290 mJ/cm 2 , which was between 0.73% and 6.63% of the original emanating light. Conclusions:The changes in post system, posts' diameter and length can be used to predict the unit changes in TLRE on the side of a translucent fiber post. Emanating radiant exposure from the side of the post was lower than 6.63% of the exposure entering the post.Clinical Relevance: Fiber post diameter and length and post system can influence light radiant exposure transmitted from posts' sides, transmitting minimal radiant exposure, which can be increased by increasing curing duration.

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“…A change in post system or brand was shown to affect the light transmission through post sides. This has been also shown in a recent study 39,40 …”

Section: Discussionsupporting

confidence: 87%

“…This has been also shown in a recent study. 39,40 White and opaque additives in fiber posts may influence light transmission. 14 In this study these additives could contribute significantly to the TLRE.…”

Section: Discussionmentioning

confidence: 99%

Transmission of radiant light energy through the sides of fiber posts

Alkhallagi

Marghalani

Alhaddad

et al. 2023

J Esthet Restor Dent

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“…However, the capacity of the post to transmit light must be considered and is dependent on the material’s composition [ 29 ]. Factors such as the variability of fiber orientation, fillers, and matrix can influence reflection and absorption quality [ 30 ]. Therefore, the translucency of the glass in glass fiber posts is preferred over zirconia ceramic posts [ 29 30 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of a relined fiberglass post with conventional and self-adhesive resin cement

Santos Junior,

Santi,

Lins

et al. 2024

Restor Dent Endod

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Objectives This study was conducted to evaluate the mechanical properties of relined and non-relined fiberglass posts when cemented to root canal dentin using a conventional dual-cure resin cement or a self-adhesive resin cement. Materials and Methods Two types of resin cements were utilized: conventional and self-adhesive. Additionally, 2 cementation protocols were employed, involving relined and non-relined fiberglass posts. In total, 72 bovine incisors were cemented and subjected to push-out bond strength testing ( n = 10) followed by failure mode analysis. The cross-sectional microhardness ( n = 5) was assessed along the root canal, and interface analyses ( n = 3) were conducted using scanning electron microscopy (SEM). Data from the push-out bond strength and cross-sectional microhardness tests were analyzed via 3-way analysis of variance and the Bonferroni post-hoc test (α = 0.05). Results For non-relined fiberglass posts, conventional resin cement exhibited higher push-out bond strength than self-adhesive cement. Relined fiberglass posts yielded comparable results between the resin cements. Type II failure was the most common failure mode for both resin cements, regardless of cementation protocol. The use of relined fiberglass posts improved the cross-sectional microhardness values for both cements. SEM images revealed voids and bubbles in the incisors with non-relined fiberglass posts. Conclusions Mechanical properties were impacted by the cementation protocol. Relined fiberglass posts presented the highest push-out bond strength and cross-sectional microhardness values, regardless of the resin cement used (conventional dual-cure or self-adhesive). Conversely, for non-relined fiberglass posts, the conventional dual-cure resin cement yielded superior results to the self-adhesive resin cement.

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“…Scientific evidence shows that there is no difficulty for light to reach a more superficial region of the intraradicular post 14 , 22-25 . In this study, the evaluate of luminous transmittance was performed in thirds; the depth was defined in millimeters at six pre-established points 22 .…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, Glass fiber posts can be associated with quartz fibers, which are pure silica in their crystallized form. Posts reinforced with glass and quartz fiber lead to better stress distribution when compared to rigid metal posts or zirconium oxide ceramic posts 14 . Fiber-reinforced posts also have advantageous optical properties over metallic post systems, reinforced by carbon fibers or metal oxide post systems 16 .…”

Section: Introductionmentioning

confidence: 99%

The luminous transmittance of the quartz-glass fiber posts is superior to glass fiber posts

CP Pasmadjian,

N Diógenes,

P Perin

et al. 2023

Acta Odontol Latinoam

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Fiber-reinforced prefabricated intraarticular posts have gained popularity due to several favorable characteristics for clinical use compared to metallic intraradicular posts. Aim: To evaluate the light transmission capacity of two types of fiber posts, using two different methods. Materials and Method: The posts were divided into two groups: experimental group - quartz-glass fiber posts (n=10) and control group – glass fiber posts (n=10). The light transmittance of the samples was compared by means of light intensity test by photographs and ultraviolet-visible spectrophotometer. This test was analyzed by thirds: coronal, middle, and apical. The spectophotometer tested the luminous transmittance along the length of the post. The statistical analysis was conducted with a significance level of 0.05. Results: Light transmission was 97% on the coronal third, 68% in the middle third, and 27.66% in the apical third in the posts of the experimental group. In the posts of the control group, the light transmission was 95.33% in the coronal third, 80.66% in the middle third, and 41.33% in the apical third. Light transmission was significantly higher in the middle third of the posts of the experimental group when compared to the control group (p<0.05). The luminous transmittance of the posts of the experimental group was 97.4% with wavelengths of 400 nm, 97% at 450 and 500 nm, and 96.9% at 550 nm. In the posts of the control group, the luminous transmittance was 72.3% with wavelengths of 400 nm, 68.6% at 450 nm; 64.6% at 500 nm and 61.5% at 550 nm. The posts of the experimental group demonstrated significantly higher light transmittance than the control group (p<0.001). Conclusion: the luminous transmittance of quartz-glass fiber posts is higher than glass fiber posts.

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

Cited by 5 publications

References 39 publications

Transmission of radiant light energy through the sides of fiber posts

Transmission of radiant light energy through the sides of fiber posts

Effects of a relined fiberglass post with conventional and self-adhesive resin cement

The luminous transmittance of the quartz-glass fiber posts is superior to glass fiber posts

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