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Year : 2021  |  Volume : 33  |  Issue : 3  |  Page : 176-181

Comparison of fracture resistance of endodontically treated mandibular first molars restored with different reinforcing materials with and without cusp capping

Department of Conservative Dentistry and Endodontics, Hitkarini Dental College, Jabalpur, Madhya Pradesh, India

Correspondence Address:
Dr. Shivkumar P Mantri
Department of Conservative Dentistry and Endodontics, Hitkarini Dental College, Dumna Airport Road, Jabalpur - 482 005, Madhya Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/endo.endo_91_21

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Aim: This study aims to estimate and compare the fracture resistance of endodontically treated mandibular first molar restored with reinforced composite resin or cusp capping. Materials and Methods: Seventy-five freshly extracted intact mandibular molars were randomly divided into five groups. The teeth were embedded vertically into the self-cure acrylic lined with elastomeric impression material to a level 1 mm apical to the cement-enamel junction. Group 1 included intact teeth. After access preparation in Groups 2–5, canals were negotiated with 10 K file, cleaned shaped using K3XF NiTi rotary files, 17% Ethylenediaminetetraacetic acid, and 3% sodium hypochlorite. After drying, the canals were obturated with gutta-percha and Sealapex sealer. Group 2 teeth were restored using Cavit. In Groups 3–5, the access cavity floor was lined by resin-modified glass-ionomer cement. After etching, rinsing, and bonding, teeth were restored. Group 3 teeth with everX posterior as a base and 1.5 mm of occlusal nanohybrid composite. Group 4 teeth were restored with nanohybrid composite after bonding Interlig fiber circumferentially in the access cavity. In Group 5, after 2 mm cusp reduction, etching, and bonding, teeth were restored by cusp capping using nanohybrid composite. All specimens were subjected to a fracture test. The peak-load fracture value in Newton was recorded. Results: One-way analysis of variance test for intergroup comparison revealed a statistically significant difference between the groups (P = 0.011). Post hoc Tukey's test showed a significant difference (P = 0.005) between everX posterior and Cavit specimens. The Chi-square test results revealed that there is a significant difference (P = 0.0276) in the fracture pattern between the groups. Conclusion: It is concluded that restoration using short fiber-reinforced composite improved the fracture resistance of endodontically treated mandibular molars. Cusp-capped teeth exhibited more favorable fractures. The combined use of fiber-reinforced composite and capping the cusps using nanohybrid composite could be a viable option to restore molar favorably.

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