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Occlusal loading of EBA and MTA root‐end fillings in a computer‐controlled masticator: a scanning electron microscopic study
Author(s) -
Peters C. I.,
Peters O. A.
Publication year - 2002
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1046/j.1365-2591.2002.00449.x
Subject(s) - dentistry , root caries , masticatory force , molar , scanning electron microscope , materials science , orthodontics , medicine , composite material
Aim The aim of this investigation was to assess the marginal adaptation of Super‐EBA (EBA) and Pro Root MTA (MTA) root‐end fillings and the occurrence of microcracks in resected root‐ends of extracted teeth before and after occlusal loading for a five‐year equivalent period in a computer‐controlled masticator. Methodology Twenty‐four molar teeth were root‐filled using lateral condensation and their root‐ends resected. Root‐end cavities were prepared and either EBA or MTA root‐end fillings were placed. All surgical procedures were completed in vitro under an operating microscope. Replicas taken of the root‐end fillings and resected root‐ends were examined using an SEM before and after they were subjected to in vitro chewing cycles in a computer‐controlled chewing simulator for the equivalent of 5 years. Marginal adaptation and integrity of the two root‐end filling materials were evaluated and the presence of microcracks recorded. Results Before loading, a continuous margin was observed with 99.4 ± 2.4% of EBA and 99.2 ± 1.6% of MTA root‐end fillings. After loading, the percentage of continuous margin decreased to 93.1 ± 6.6% and 98.9 ± 3.2% for EBA and MTA, respectively. After occlusal loading, 39.5% of the EBA root‐end fillings were overfilled, whilst 52.6% of the MTA root‐end fillings were underfilled. In total, 12.5% of the resected root‐end surfaces showed microcracking before loading and 25% after occlusal loading. Conclusions Both EBA and MTA displayed excellent marginal adaptation before masticatory loading. After loading, the amount of continuous margin for both root‐end filling materials decreased slightly but was still high.