Light-transmitting ability of marketed fiber posts

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Effective polymerization of resin-based cements is crucial for fiber post luting.
• Light activation is essential for photo-curing agents used in self-curing materials.
• The translucency of fiber posts influences light penetration for adequate cement curing.

Purpose of the Study:

• To evaluate the light-transmitting ability of various marketed fiber posts.
• To compare the actual translucency with manufacturers' claims.
• To determine the impact of fiber post material on light transmission for resin cement polymerization.

Main Methods:

• Ten samples of each fiber post type were subjected to light irradiation using a standard curing unit.
• Spectrophotometric measurements quantified photon counts at different post depths (coronal, apical, apical tip).
• Statistical analysis included linear regression and two-way ANOVA (alpha = 0.05).

Main Results:

• FibreKleer and Tech21 X-OP exhibited no measurable light transmission.
• Other posts showed decreased light intensity from coronal to apical, with a peak at the apical tip for GC Fiber Post, Macrolock Illusion Post, and Radix Fiber Post.
• Light transmission was significantly higher coronally. Dentin Post X and FRC Postec Plus demonstrated significantly different translucency compared to Reforpost, FibreKleer, Tech21 X-OP, and Composipost.

Conclusions:

• Significant variations in light transmission exist among different fiber post brands.
• The translucency of fiber posts does not consistently align with manufacturer claims.
• Clinical implications include potential under-curing of resin cements in areas with poor light transmission, affecting bond strength and longevity.