title: Effect of repeated vertical loads on microleakage of IRM and calcium sulfate-based temporary fillings.
abstract: Temporary fillings are commonly used to seal endodontic access cavities between visits. IRM and Cavidentin were selected to represent two widely used groups of temporary filling materials. The first is a reinforced zinc oxide-eugenol preparation that is mixed at chairside, whereas the second is a ready-to-use calcium sulfate-based material that gained popularity due to its convenience of application. The seal provided by the aforementioned materials was studied using a radioactive tracer quantitative assay. When compared as passive temporary filling, the two provided a similar quality of seal. However, when subjected to repetitive "occlusal" cyclic loading of 4 kg, IRM was clearly superior to the calcium sulfate-based material. Whereas IRM maintained a reasonable seal, the calcium sulfate-based fillings deteriorated and lost the ability to seal. These results suggest that even though calcium sulfate-based materials may be useful when not subjected to any occlusal forces, IRM should be preferred whenever occlusal loads may be applied. Furthermore it is demonstrated that testing such materials for microleakage with no reference to mastication forces may be of limited value.
authors.affiliation: Department of Restorative Dentistry, The Goldschleger School of Dental Medicine, Tel Aviv University, Israel.
authors.forename: R
authors.initials: R
authors.lastname: Liberman
authors.forename: A
authors.initials: A
authors.lastname: Ben-Amar
authors.forename: E
authors.initials: E
authors.lastname: Frayberg
authors.forename: I
authors.initials: I
authors.lastname: Abramovitz
authors.forename: Z
authors.initials: Z
authors.lastname: Metzger
mesh_terms: D001732:Bite Force; D002133:Calcium Sulfate / Q000009:adverse effects; D003738:Dental Cements; D003763:Dental Leakage / Q000209:etiology*; D003794:Dental Restoration, Temporary / Q000009:adverse effects; D003799:Dental Stress Analysis; D004338:Drug Combinations; D006801:Humans; D008422:Materials Testing; D008768:Methylmethacrylates / Q000009:adverse effects; D008963:Molar; D011145:Polyvinyls / Q000009:adverse effects; D012387:Root Canal Filling Materials / Q000009:adverse effects; D016474:Weight-Bearing; D015034:Zinc Oxide / Q000009:adverse effects; D015035:Zinc Oxide-Eugenol Cement / Q000009:adverse effects
chemical_list: D003738:Dental Cements; D004338:Drug Combinations; D008768:Methylmethacrylates; D011145:Polyvinyls; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C031667:IRM cement; C020872:Cavit; D015034:Zinc Oxide; D002133:Calcium Sulfate