In vitro Results of Scanning Technique on Assessing Cement Thickness and Interfacial Nanoleakage of Luted CAD/CAM-fabricated Fiber Posts

Abstract

Background: Fiber posts are broadly used due to their good esthetics and elasticity close to that of dentin, which allows for uniform stress distribution within a root and lowers the possibility of nonrestorable root fractures. Aim and Objectives: The study assessed the layer of cement thickness and interfacial nanoleakage of luted fiber posts which were fabricated with CAD/CAM technology following direct scanning of the post space (DS) method, scanning of a polyether impression of the post space (IS), and scanning of a plaster model of the post space (MS). Methodology: Ninety premolars were chosen randomly and were assigned to three groups according to the scanning technique. Posts were computer designed and milled from experimental fiber-reinforced composite blocks. Results: The mean and standard deviation values of cement thickness, respectively, were: DS 172 ± 39 = m; IS 199 ± 55 = m, and MS MPa 272 ± 81 = m. The fiber posts fabricated following DS technique demonstrated superior performance compared to posts fabricated upon IS and MS, in terms of the post retention. The cement thickness did not differ between DS and IS, whereas in MS group, the cement layer was significantly thicker than in the remaining two groups. The scanning technique did not influence the sealing ability, as all groups showed comparable nanoleakage. Conclusion: Fiber posts fabricated following DS technique demonstrated superior performance. Furthermore, scanning technique did not influence the sealing ability, as all groups showed comparable nanoleakage.

Adaptation of Different Milled Post Materials with Flared Root Canals

“…The mean ± standard deviation of cement distance was 154 ± 67 µm. These results are within the previously reported results obtained by Tsintsadze et al 15 who studied the effects of scanning technique on the performance of CAD/CAM-fabricated fiber posts and found that the cement thickness was 162 ± 24 μm for posts fabricated by the direct scanning of the post space, also within the results of Vaddamanu et al 16 who assessed the layer of cement thickness and nano leakage of luted fiber posts which were fabricated with CAD/CAM technology and recorded 172 ± 39 μm cement thickness of the milled posts fabricated using the direct technique.…”

“…Void formations decrease the bonding strength by restricting the available area for cementation. 16 The prefabricated posts (RF group) showed the least voids volume and voids area between groups in all sections. This result disagrees with the result obtained by Gama et al 10 who used microcomputed tomography scanning to compare the voids volume of CAD/CAM milled glass fiber posts and prefabricated fiber posts in flared root canals and concluded that CAD/CAM Mansoura Journal of Dentistry Abdo et al…”

Comparison of the Effect of Simulated Gastric Juice on Surface Roughness and Flexural Strength of Three Different Computer Aided Designing Computer Aided Manufacturing Blocks: An In Vitro Study

“…However among all other dental ceramics zirconia has the highest mechanical characteristics. In spite of superior mechanical properties, ceramics are brittle in nature to overcome the brittle nature of ceramics, resins are incorporated to increase the material's flexibility (6,7).These resin matrix ceramics can be classified as resin based ceramics and hybrid ceramics. The resin-based ceramics consist of polymer matrix with at least 80% nano sized ceramic filler particles whereas the hybrid ceramics made of a ceramic network infiltrated with a polymer(8).…”