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. 2014 Mar;11(2):264-71.

Fracture resistance of structurally compromised premolar roots restored with single and accessory glass or quartz fiber posts

Farahnaz Sharafeddin  1 , Ali Asghar Alavi  1 , Samira Zare  2
Affiliations

Fracture resistance of structurally compromised premolar roots restored with single and accessory glass or quartz fiber posts

Farahnaz Sharafeddin et al. Dent Res J (Isfahan). 2014 Mar.

Abstract

Background: Glass and quartz fiber posts are used in restoration of structurally compromised roots. Accessory fiber posts are recently introduced to enhance the fiber post adaptation. This study evaluated the effectiveness of glass versus quartz accessory fiber posts.

Materials and methods: In this experimental study, 40 mandibular premolar roots with similar dimension (radius of 3.5 ± 0.2 mm and length of 13 ± 0.5 mm) were selected and their root canals were flared until 1.5 mm of dentin wall remained. They were randomly assigned to four groups (n = 10) and restored as follows: Exacto glass fiber post (EX), Exacto glass fiber post + 2 Reforpin accessories (EXR), D. T. Light quartz fiber post (DT), and D. T. Light quartz fiber post + 2 Fibercone accessories (DTF). All posts were cemented with Duo-Link resin cement and the cores were built with the particulate filler composite. Following 1-week water storage, specimens were subjected to fracture loads in a universal testing machine. The maximum loads and failure modes were recorded and analyzed with the two-way analysis of variance (ANOVA) and Fisher's exact tests (α = 0.05).

Results: The mean fracture resistance values (N) were 402.8 (EX), 378.4 (EXR), 400.1 (DT), and 348.5 (DTF). Two-way ANOVA test showed neither reinforcing method (P = 0.094), nor post composition (P = 0.462) had statistically significant differences on fracture resistance of the structurally compromised premolar teeth. Fisher's exact test also demonstrated no statistically significant difference regarding two variables (P = 0.695). Core fracture was the most common failure mode (62.5%).

Conclusion: Glass and quartz fiber posts with or without accessories restored the weakened premolar roots equally.

Keywords: Accessory fiber post; compromised roots; fracture resistance; glass; quartz.

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Conflict of interest statement

Conflict of Interest: None declared

Figures

Figure 1
Figure 1
Root canal and post space preparation. (a) Radiograph obtained after obturation. (b) The canal was emptied to a depth of 8 mm. (c) The canal was flared till the remaining dentinal wall thickness reached 1.5 mm
Figure 2
Figure 2
Experimental groups. (a) Group EX (Exacto glass fiber post). (b) Group EXR, (Exacto glass fiber post + two Reforpin accessories). (c) Group DT (D. T. Light quartz fiber post). (d) Group DTF (D. T. Light quartz fiber post + 2 Fibercone accessories)
Figure 3
Figure 3
45° compressive load
Figure 4
Figure 4
Failure patterns. (a) Core detachment. (b) Core fracture more than one-third. (c) Complete core fracture. (d) Supracrestal root fracture. (e) Vertical root fracture. (f) Post cracking
Figure 5
Figure 5
Fracture resistance mean and SD. EX: Exacto glass fiber post, EXR: Exacto glass fiber post + two Reforpin accessories, DT: D. T. Light quartz fiber post, DTF: D. T. Light quartz fiber post + 2 Fibercone accessories
Figure 6
Figure 6
Patterns of change in the experimental groups
See this image and copyright information in PMC

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