Abstract
Aim. The aim of this study was to compare the fracture resistance of simulated immature teeth restored with gutta-percha, glass fiber posts (GFP), experimental dentine posts (DP) or Intracanal composite Resin (ICR). Materials and Methods. Fifty maxillary canines were decoronated, standardized and enlarged until, number 5 Peeso reamers were allowed to simulate immature teeth. After placement of 5 mm of MTA, the canals were divided into 5 groups and filled as follows: Group 1: AH Plus + gutta-percha, lateral compaction; Group 2: GFP luted with PARACORE dual cure resin; Group 3: DP luted with PARACORE dual cure resin; Group 4: PARACORE dual cure resin. A standardized core was built in all groups except in Group 5. Each of the specimens was tested for fracture resistance by universal testing machine. Results. The mean fracture resistance were 817 ± 27.753, 1164.6 ± 21.624, 994.4 ± 96.8747, 873.8 ± 105.446 and 493.7 ± 6.945 newtons for Groups 1, 2, 3, 4, and 5 respectively. Independent “t” test revealed statistically significant discrepancies, in the fracture resistance among the 4 groups except Group 1 and Group 4 (P < 0.05). Conclusions. This study suggests that GFP and DP may be preferred for additional reinforcement of immature teeth.
Highlights
Nonvital, endodontically treated teeth are more prone to fracture against chewing forces than vital teeth [1,2,3]
When a developing tooth gets traumatized and becomes nonvital, the development of root gets halted resulting in divergent dentinal walls of the root canals with open apex
Placing a thick layer of dentin-bonded intracanal resin composite around a fiber post when required significantly improved the fracture resistance of thin-walled roots [18]
Summary
Endodontically treated teeth are more prone to fracture against chewing forces than vital teeth [1,2,3]. When a developing tooth gets traumatized and becomes nonvital, the development of root gets halted resulting in divergent dentinal walls of the root canals with open apex. This further increases the susceptibility of these teeth to fracture during normal functional stresses, in the cervical area of the root and often leaving them nonrestorable [4]. Preservation of such teeth is important as extraction may exert adverse effects on nutrition, individual’s psychology, and personality development.
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