A comparative evaluation of fracture resistance of endodontically treated teeth, with variable marginal ridge thicknesses, restored with composite resin and composite resin reinforced with Ribbond: an in vitro study.

Abstract

BACKGROUND:

The anatomic shape of maxillary premolars show a tendency towards separation of their cusps during mastication after endodontic treatment. Preservation of the marginal ridge of endodontically treated and restored premolars can act as a strengthening factor and improve the fracture resistance.

OBJECTIVES:

To evaluate the effect of varying thickness of marginal ridge on the fracture resistance of endodontically treated maxillary premolars restored with composite and Ribbond reinforced composites.

MATERIALS AND METHODS:

One hundred and twenty, freshly extracted, non carious human mature maxillary premolars were selected for this experimental in vitro study. The teeth were randomly assigned in to twelve groups ( n = 10). Group 1 received no preparation. All the premolars in other groups were root canal treated. In subgroups of 3 and 4, DO cavities were prepared while MOD cavities were prepared for all subgroups of group 2, the dimensions of the proximal boxes were kept uniform. In group 3 and 4 the dimensions of the mesial marginal ridge were measured using a digital Vernier caliper as 2 mm, 1.5 mm, 1 mm and 0.5 mm in the respective subgroups. All samples in groups 2.2 and all the subgroups of 3 were restored with a dentin bonding agent and resin composite. The teeth in group 2.3 and all subgroups of 4 were restored with composite reinforced with Ribbond fibers. The premolars were submitted to axial compression up to failure at 45 degree angle to a palatal cusp in universal testing machine. The mean load necessary to fracture was recorded in Newtons and the data was analysed.

RESULTS:

There was a highly significant difference between mean values of force required to fracture teeth in group 1 and all subgroups of group 2, 3 and 4 (i.e., P < 0.01) CONCLUSION: On the basis of static loading, preserving the mesial marginal ridge with thicknesses of mm, 1.5 mm, 1 mm and 0.5 mm, composite restored and Ribbond reinforced composite restored maxillary premolars can help preserve the fracture resistance of teeth.

• Authors: Vaishali Kalburge, Shaikh Shoeb Yakub, Jitendra Kalburge, Hemalatha Hiremath, Anshu Chandurkar
• Journal: Indian journal of dental research : official publication of Indian Society for Dental Research (Indian J Dent Res) 2013 Mar-Apr Vol. 24 Issue 2 Pg. 193-8 ISSN: 1998-3603 [Electronic] India
• PMID: 23965445 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Composite Resins
• Dental Materials
• Dentin-Bonding Agents
• Filtek Z250
• Phosphoric Acids
• Polyethylenes
• RIBBOND
• single bond
• Bisphenol A-Glycidyl Methacrylate
• phosphoric acid

Topics

• Acid Etching, Dental (methods)
• Bicuspid (pathology)
• Bisphenol A-Glycidyl Methacrylate (chemistry)
• Composite Resins (chemistry)
• Dental Cavity Preparation (classification)
• Dental Materials (chemistry)
• Dental Polishing (methods)
• Dental Restoration, Permanent (methods)
• Dental Stress Analysis (instrumentation)
• Dentin-Bonding Agents (chemistry)
• Humans
• Materials Testing
• Phosphoric Acids (chemistry)
• Polyethylenes (chemistry)
• Root Canal Therapy (methods)
• Stress, Mechanical
• Temperature
• Time Factors
• Tooth Crown (pathology)
• Tooth Fractures (physiopathology)
• Tooth, Nonvital (pathology, therapy)