Influence of Varying Ferrule Heights and Configurations on the Fracture Resistance of Endodontically Treated Mandibular First Molars-An in Vitro Study Marya Shriya1, Shetty Thilak2, Rodrigues Shobha J3,*, Saldanha Sharon4, Pai Umesh4, Mundathaje Mahesh4, Hegde Puneeth4 1Former Postgraduate Student, Department of Prosthodontics, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, India 2Professor, Department of Prosthodontics, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, India 3Professor & Head, Department of Prosthodontics, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, India 4Associate Professor, Department of Prosthodontics, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, India *Corresponding author, Dr Shobha J Rodrigues, Professor & Head, Department of Prosthodontics, Manipal College of Dental Sciences, Lighthouse Hill Road, Mangalore-575001, India. Email: shobhaj@manipal.edu, Telephone: 0091 8242425886, 09448100464, Fax: 0824 4250521
Online published on 7 May, 2019. Abstract Purpose To evaluate the influence of varying ferrule heights and configurations on the fracture resistance of endodontically treated teeth restored with custom cast post and cores and full metal crowns. Method Fifty extracted human mandibular first premolars were randomly divided into 5 groups: I, no root canal treatment (RCT), crown; II, no post and core, crown; III, 2-mm ferrule, cast post and core and crown; IV, non-uniform ferrule (2 mm buccal and lingual, 0.5 mm proximal), cast post and core and crown; and V, no ferrule, cast post and core and crown. Samples were subjected to a static load on the buccal cusp, 150° to the long axis of the tooth, and failure load was recorded. Statistical analysis was carried out with a 1-way analysis of variance and the Bonferroni pairwise comparison. The mode of fracture was noted by visual inspection. Results Absence of ferrule resulted in significantly lower fracture resistance (V: 308.27 +/-75.567 N) as compared to all other groups. Group I: 714.69 +/-89.37 N, and Group II: 656.90 +/-133.15 N were significantly more resistant as compared to Group IV: 471.98 +/-115.99 N (p < 0.01). However, there was no significant difference between non-uniform ferrule and the uniform 2-mm vertical ferrule. Conclusion The premolars with a ferrule were more fracture resistant as compared to the teeth with no ferrule preparation. Top Keywords Ferrule, endodontics, fracture resistance. Top |