A1 Refereed original research article in a scientific journal
Effects of Filling Technique and Light Irradiation Distance on the Push-Out Bond Strength of Dual and Light Cured Core Materials in a Direct Core Build-Up
Authors: Niitsuma A, Shinya A, Shiratori S, Kuroda S, Hatta M, Gomi H
Publisher: WORLD SCIENTIFIC PUBL CO PTE LTD
Publication year: 2017
Journal: Journal of Molecular and Engineering Materials
Journal name in source: JOURNAL OF MOLECULAR AND ENGINEERING MATERIALS
Journal acronym: J MOL ENG MATER
Article number: ARTN 1740008
Volume: 5
Issue: 4
Number of pages: 7
ISSN: 2251-2373
eISSN: 2251-2381
DOI: https://doi.org/10.1142/S2251237317400081
Abstract
This study evaluated the effects of filling technique and light irradiation distance on the push-out bond strength of dual-cured (DC) and light-cured (LC) core materials to the root canal dentin. DC and LC core materials were filled with a bovine root canal post space of 8 mm deep, and polymerized under two different filling procedures, i.e., an 8 mm bulk filling (I) and two times of 4 mm incremental filling (II), multiplying two different light irradiation distances (0 or 5 mm) from top of the root canal. After 24 h water storage, specimens were horizontally sectioned to obtain 1 +/- 0.1 mm thick core/dentin slices, and five slices were obtained for each root. After the slicing process, push-out tests were performed. Among all groups, the highest bond strength was observed in DCI5 (13.7 +/- 4.3MPa), whereas the lowest was observed in LCI0 (10.3 +/- 3.7 MPa). Consequently, the recommended curing procedure between DC and LC core materials differed. Combination of LC core material with incremental filling technique and of DC core material with bulk filling technique indicated higher bond strength. Higher bond strength was measured at a 5 mm light irradiation distance for both LC and DC core materials.
This study evaluated the effects of filling technique and light irradiation distance on the push-out bond strength of dual-cured (DC) and light-cured (LC) core materials to the root canal dentin. DC and LC core materials were filled with a bovine root canal post space of 8 mm deep, and polymerized under two different filling procedures, i.e., an 8 mm bulk filling (I) and two times of 4 mm incremental filling (II), multiplying two different light irradiation distances (0 or 5 mm) from top of the root canal. After 24 h water storage, specimens were horizontally sectioned to obtain 1 +/- 0.1 mm thick core/dentin slices, and five slices were obtained for each root. After the slicing process, push-out tests were performed. Among all groups, the highest bond strength was observed in DCI5 (13.7 +/- 4.3MPa), whereas the lowest was observed in LCI0 (10.3 +/- 3.7 MPa). Consequently, the recommended curing procedure between DC and LC core materials differed. Combination of LC core material with incremental filling technique and of DC core material with bulk filling technique indicated higher bond strength. Higher bond strength was measured at a 5 mm light irradiation distance for both LC and DC core materials.
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