Influence of core materials in the microleakage of cast crowns

Abstract

Endodontically treated teeth can be restored with prosthetic crowns over cast metal cores or prefabricated posts with composite resin cores. Prosthetic failure is frequently observed possibly due to microleakage. To verify the influence of the core materials in the microleakage of cast crowns, this research studied three experimental conditions: (a) teeth with partial dental remaining core with prefabricated post and partial composite resin cores, (b) teeth with cast metal posts/cores, and (c) teeth with prefabricated posts and composite resin cores. Teeth preparations were standardized, duplicated and the crowns were made in NiCr alloy, which were cemented with zinc phosphate cement. The specimens were submitted to thermocycling and mechanical stresses. They were immerged in a 0,05% aqueous solution of basic fuchsin for 8 hours during 3 days. The crowns were sliced buccal-lingually, and their microleakage was evaluated by glass magnification, according to a score scale. There was no statistical difference between conditions (a) and (c). Microleakage at cervical region of axial wall was observed in both cases. Condition (b) showed higher microleakage, which reached medium third of axial wall.

Comparison of microleakage from stainless steel crowns margins used with different restorative materials: An in vitro study

“…This is consistent with previous reports that the type of core material influences microleakage, bond strength and the success of crowns. [ 4 15 ] However, Yesil found no significant differences in the degree of microleakage between amalgam and a composite used as the core. [ 18 ] The discrepancies between studies may be due to differences in the type of teeth or crowns, core materials, storage time, pH of the medium, luting cement and methods of evaluation.…”

“…The type of restorative material used beneath a full crown influences crown retention and microleakage along the crown margins. [ 5 15 ] Few studies have evaluated different types of restorative materials beneath SSCs in primary teeth. The aim of this in vitro study was to evaluate microleakage and material loss with five different core restorative materials at the SSC margins in primary molars.…”