Einfluss des internen Bleachings auf den Haftverbund von zwei verschiedenen Befestigungskompositen
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Philipps-Universität Marburg
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Abstract
Focusing on the esthetic important region of the upper front teeth, especially at nonvital
teeth, discoloration of the dental hard tissue may occur, which can be treated by
bleach techniques [151]. If the bleached teeth need a further restoration during the
therapy, a filling- or post-restoration depending on the destruction level will be
necessary. At this time it comes to an interaction between the bleached dental hard
tissue and the core build-up or post luting system.
The aim of this study was to check out if the “internal bleaching” with sodium perborate
influences the bond between tooth and the luting composite. Furthermore it was
necessary to determine if the neutralization with calcium hydroxide has an influential
factor. To complete the analysis the fracture mode between post, luting composite and
tooth was analyzed.
During the study 60 extracted, single root teeth with a straight root canal were
decapitated at the cementoenamle junction and trimmed straight. The root canal was
prepared with the mechanical BioRaCe System to a length of 8mm and a size of ISO 60
under irrigation with destilled water. The teeth were randomized and divided into two
groups (1: Bifix SE and 2: Futurabond U/ Rebilda DC) as well as into three subgroups
each (A-C). The subgroups differentiated as follow: Group A: Control group, no
bleaching and no neutralization; Group B: Bleaching with sodium perborate + Aqua
dest. for one week, following another week of neutralization with calcium hydroxide;
Group C: Bleaching with sodium perborate + Aqua dest.. After a period of one more
week an experimental steel spreader, adjusted to ISO 55, was cemented with the luting
composite according to the main group. The luting materials hardened only chemicaly.
After a storage of three weeks at 23°C and 100% humidity the samples were stressed by
means of a pull-out method, derived from the method of Ebert et al. [42], by using a
universal test machine until the failure of the bond. To analyze the failure mode macro
shootings of the steel spreader were taken.
The bond strengths of the control groups between the two different luting composits
showed significantly differences (1A: 10,19 MPa; 2A: 7,52 MPa; p= 0,021). This also
applies to the Aqua dest.-groups (1C: 8,08 MPa; 2C: 4,12 MPa; p=0,006). If you
examine the groups 1 and 2, the bleaching with following neutralization in group 1
leads to significantly lower bond strengths compered to the control group (1A: 10,19
MPa; 1B: 7,2 MPa; p=0,034). In group 2 the bleaching without neutralization results in
the lowest results of the entire test series, with significant differences to the control
group and the AH Temp-group (2A: 7,52 MPa; 2B: 7,26 MPa; 2C: 4,12 MPa;
p(2A/2C)=0,028; p(2B/2C)=0,016).
The internal bleaching with sodium perborate has an negative influence to the bond
strength between dentin and the luting composites Bifix SE and Futurabond U/ Rebilda
DC. However, the amount of influence is different. The neutralization with calcium
hydroxide does not lead to significantly lower results, using Futurabond U/ Rebilda DC
has even a better bond strength.
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Dates
Created: 2016Issued: 2016-12-06
Faculty
Medizin
Publisher
Philipps-Universität Marburg
Language
ger
Data types
DoctoralThesis
Keywords
Luting agentpull-out methodbond strength
DFG-subjects
internes BleachingBleichen ZahnHaftverbundBefestigungskompositePull-out Analyse
DDC-Numbers
610
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Koberg, Patricio Maximilian: Einfluss des internen Bleachings auf den Haftverbund von zwei verschiedenen Befestigungskompositen. : Philipps-Universität Marburg 2016-12-06. DOI: https://doi.org/10.17192/z2016.0886.
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This item has been published with the following license: In Copyright