Abstract
ObjectiveThis study investigated the effect of different ferrule heights on endodontically treated premolars.Materials and MethodsFifty sound mandibular first premolars were endodontically treated and then restored with 7-mm fiber post (FRC Postec Plus #1 Ivoclar-Vivadent) luted with self-polymerized resin cement (Multilink, Ivoclar Vivadent) while the coronal section was restored with hybrid composite core build-up material (Tetric Ceram, Ivoclar-Vivadent), which received all-ceramic crown. Different ferrule heights were investigated: 1-mm circumferential ferrule without post and core (group 1 used as control), a circumferential 1-mm ferrule (group 2), non-uniform ferrule 2-mm buccally and 1-mm lingually (group 3), non-uniform ferrule 3-mm buccally and 2-mm lingually (group 4), and finally no ferrule preparation (group 5). The fracture load and failure pattern of the tested groups were investigated by applying axial load to the ceramic crowns (n=10). Data were analyzed statistically by one-way ANOVA and Tukey’s post-hoc test was used for pair-wise comparisons (α=0.05).ResultsThere were no significant differences among the failure load of all tested groups (P<0.780). The control group had the lowest fracture resistance (891.43±202.22 N) and the highest catastrophic failure rate (P<0.05). Compared to the control group, the use of fiber post reduced the percentage of catastrophic failure while increasing the ferrule height did not influence the fracture resistance of the restored specimens.ConclusionsWithin the limitations of this study, increasing the ferrule length did not influence the fracture resistance of endodontically treated teeth restored with glass ceramic crowns. Insertion of a fiber post could reduce the percentage of catastrophic failure of these restorations under function.
Highlights
Treated teeth often loose substantial tooth structure from previous caries, pre-existing restorations, and/or endodontic treatment18, which reduce tooth bulk and thickness of healthy dentin resulting in increased chances of fracture under function8
Panitvisai and Messer23 (1995) UHSRUWHG WKDW FXVSDO GHÀHFWLRQ increased with increasing the extension of cavity preparations and was greatest when endodontic access was incorporated into a preparation
Statistical DQDO\VLV UHYHDOHG QR VLJQL¿FDQW GLIIHUHQFHV EHWZHHQ the failure load of the tested groups and the control group restored without fiber post (P
Summary
Treated teeth often loose substantial tooth structure from previous caries, pre-existing restorations, and/or endodontic treatment, which reduce tooth bulk and thickness of healthy dentin resulting in increased chances of fracture under function. The insertion of a post does not strengthen or reinforce endodontically treated teeth LW LV EDVLFDOO\ XVHG WR SURYLGH VXI¿FLHQW retention of the core material which in turn is used WR UHWDLQ D ¿[HG UHVWRUDWLRQ15. Special attention should be given to the material the post is made of in order to ensure adequate distribution of the absorbed stresses and to prevent root fracture during. Regarding with consideration to the well-known success of metallic posts there are many concerns regarding the associated inhomogeneous stress distribution, biological side effects due to microleakage and FRUURVLRQ DQG WKH LQÀXHQFH RI WKHLU GDUN FRORU XQGHU an all-ceramic restorations
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
