Abstract
ObjectiveThis study evaluated, in vitro, the fracture resistance of human non-vital teeth restored with different reconstruction protocols. Material and methodsForty human anterior roots of similar shape and dimensions were assigned to four groups (n=10), according to the root reconstruction protocol: Group I (control): non-weakened roots with glass fiber post; Group II: roots with composite resin by incremental technique and glass fiber post; Group III: roots with accessory glass fiber posts and glass fiber post; and Group IV: roots with anatomic glass fiber post technique. Following post cementation and core reconstruction, the roots were embedded in chemically activated acrylic resin and submitted to fracture resistance testing, with a compressive load at an angle of 45º in relation to the long axis of the root at a speed of 0.5 mm/min until fracture. All data were statistically analyzed with bilateral Dunnett's test (α=0.05). ResultsGroup I presented higher mean values of fracture resistance when compared with the three experimental groups, which, in turn, presented similar resistance to fracture among each other. None of the techniques of root reconstruction with intraradicular posts improved root strength, and the incremental technique was suggested as being the most recommendable, since the type of fracture that occurred allowed the remaining dental structure to be repaired. ConclusionThe results of this in vitro study suggest that the healthy remaining radicular dentin is more important to increase fracture resistance than the root reconstruction protocol.
Highlights
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Requiring restorative techniques that do not compromise the integrity of the remaining root structure 11,30 $ PHWKRG WKDW KDV EHHQ VKRZQ to substantially increase fracture resistance of endodontically treated teeth is the placement of a cast metal band around the coronal surface, leaving LW DERYH WKLV PDUJLQ 7KLV SURFHGXUH NQRZQ DV WKH “ferrule effect”, is recommended by many authors ZKHQ WKH IUDFWXUH UHVLVWDQFH RI HQGRGRQWLFDOO\ treated teeth needs to be increased5,12,14,19,24
In an attempt to avoid early loss and reestablish IXQFWLRQ RI WKH ZHDNHQHG URRW UHPQDQW LQ WKH RUDO cavity, different materials and restorative techniques have been combined5,16 . ,18,23,26 Among these materials and techniques, it has been suggested that the use of chemically compatible adhesive UHVWRUDWLYH FRPSRQHQWV ZLWK PHFKDQLFDO SURSHUWLHV FORVHU WR WKRVH RI GHQWLQ ZRXOG IDYRU SUHVHUYDWLRQ of the root3,13,17,21,29
Summary
Intraradicular posts are necessary for restoring WKH FURZQV RI WHHWK FRPSURPLVHG E\ HQGRGRQWLF WUHDWPHQW ZLWK ZLGHQHG FDQDOV 6HYHUDO DXWKRUV KDYH DI¿UPHG WKDW WKH QHHG WR XVH LQWUDUDGLFXODU SRVWV LV GHWHUPLQHG E\ WZR PDLQ IDFWRUV WKH TXDQWLW\ RI UHPDLQLQJ GHQWLQ IRU UHWDLQLQJ WKH FURZQ and the internal nature of the root structure. Intraradicular posts are necessary for restoring WKH FURZQV RI WHHWK FRPSURPLVHG E\ HQGRGRQWLF WUHDWPHQW ZLWK ZLGHQHG FDQDOV 6HYHUDO DXWKRUV KDYH DI¿UPHG WKDW WKH QHHG WR XVH LQWUDUDGLFXODU SRVWV LV GHWHUPLQHG E\ WZR PDLQ IDFWRUV WKH TXDQWLW\ RI UHPDLQLQJ GHQWLQ IRU UHWDLQLQJ WKH FURZQ and the internal nature of the root structure4,7,24 Factors such as, caries and trauma may create a ZLGHQHG URRW FDQDO ,Q FDVHV RI GHQWDO WUDXPD LQ young patients, these frequently interrupt apical closing and complete root development, leading to WKH IRUPDWLRQ RI DQ ZLGHQHG URRW FDQDO WKDW UHPDLQV like that. This study compared three techniques of root reconstruction using composite resin and glass ¿EHU SRVWV 7KH QXOO K\SRWKHVLV LV WKDW WKHUH LV QR VWDWLVWLFDOO\ VLJQL¿FDQW GLIIHUHQFH LQ WKH IUDFWXUH UHVLVWDQFH DQG IDLOXUH PRGH EHWZHHQ URRWV UHFRQVWUXFWHG LQ WKH GLIIHUHQW ZD\V
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