An evaluation of Physico - Mechanical properties of Core build-up materials in relation to endodontics

Abstract

AbstractCore materials are used to reconstruct broken down endodontically treated teeth in order to give a resistance form to the tooth and retention form to the subsequent prosthesis. A study on the physico- mechanical properties of core materials may give the clinician an informed choice to favour one material over another. The aim of the study was to investigate the physico-mechanical properties of core build-up materials. The materials investigated were Grandio Core, Core.X Flow, Bright Flow Core, Speedee and Fuji II LC. The hardness of the bottom and top of the specimens was measured for all materials after incubating the specimens in water for 24 h. Significant differences were found in the top and bottom Vickers hardness values between the materials. All materials showed adequate bottom to top hardness ratios above 80%. Bottom to top hardness ratios ranged from 0.85% to 95%.The effect of water on 4 mechanical properties; compressive strength, flexural strength, flexural modulus and fracture toughness were investigated for the materials after 30 days. Compressive strength and fracture toughness were not affected by water storage, while flexural strength and flexural modulus were significantly reduced after water storage.The effect of cyclic loading on the compressive strength of tested materials was tested. After 250,000 cycles the compressive strength of tested materials was not significantly reduced. Under the current in vitro conditions in the study the tested materials can survive for at least one year in a patient's mouth without a significant reduction in their compressive strength.Water sorption and solubility were tested for materials after 1 month and 1 year. There was a significant difference between materials in the water sorption and solubility behaviours after both 1 month and 1 year.Grandio Core had the highest strength values of all the tested properties, while Fuji II LC had the lowest. Dual cure composites core materials showed better performances than the light cured reinforced resin modified glass ionomer with respect to all tested properties. This indicates that resin composites are favoured over glass ionomers for core build up applications when high stresses are expected.

Date of Award	30 Sept 2014
Original language	English
Awarding Institution	The University of Manchester
Supervisor	Hugh Devlin (Supervisor) & Nick Silikas (Supervisor)