Auswirkung verschiedener Maßnahmen zur Speicheldekontamination auf den Adhäsivverbund zwischen Dentin und Komposit
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Philipps-Universität Marburg
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1 Abstract
1.1 Objects
Aim of this study was to determine the effect of saliva contamination on bond strength between resin composite and dentin and to study the effectiveness of different decontamination protocols. The window of contamination was chosen after phosphoric acid etching and prior to adhesive application. Different amounts of saliva were tested with different decontamination procedures.
The adhesive system used was Syntac®, a 4-step-etch-and-rinse-system, and the packable composite used was Venus® Pearl.
1.2 Material and methods
Class-I cavities measuring 4x4x4 mm were cut in each of 36 caries-free third molars. Specimens were assigned to nine groups (n=4). All groups underwent etching with 37,5% phosphoric acid and were subsequently filled using Syntac® and Venus® Pearl.
Saliva was a 1:1:1 mixture of saliva samples from three healthy subjects. Group K acted as a control group and was filled without saliva contamination. The remaining teeth were divided into 4 groups with 2 subgroups a) and b) each; in group a) 2,5µl and in group b) 5µl of saliva mixture were applied to the cavities after the etching of enamel and dentin. Every group then underwent a different decontamination protocol.
Group 1: No decontamination
Group 2: Drying the cavity with a dental air syringe
Group 3: Wiping the cavity with alcohol and drying
Group 4: Rinsing the cavity with air-water-mixture, drying, wiping with alcohol, drying
Afterwards adhesive and bonding were applied to the cavities. Then they were filled with Venus® Pearl using layering technique and polished subsequently.
The filled teeth were cut into 0,8 x 0,8mm thick dentin-composite-beams by a microsaw. The sticks were inserted to a micro tensile tester and tested for adhesive bond strength. Dentin fragments were examined under a scanning electron microscope to determine the type of bonding failure.
1.3 Results
Saliva contamination was always associated with a significant reduction of dentin bond strength (p<0.05). The amount of saliva inside the cavity did not have a significant infuence(p<0.05). None of the decontamination measures examined resulted in an appropriate compensation regarding bond strength. However, there were strikingly high bond strengths in groups 3b) and 4a) that would require further investigation. Just drying a cavity contaminated with saliva never gave any sufficient decontamination.
1.4 Practical Conclusions
In order to ensure a good bond to dentin, and thus the longevity of a restoration, cavity contamination with saliva after etching should always be strictly avoided. Adequate isolation of the work area is therefore crucial for the success of the restoration. None of the decontamination measures examined was able to re-establish a contamination-free situation with the adhesive technology used.
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Dates
Created: 2023Issued: 2023-03-21Updated: 2023-03-21
Faculty
Medizin
Publisher
Philipps-Universität Marburg
Language
ger
Data types
DoctoralThesis
Keywords
microtensile bond strength testAdhäsivSpeicheldekontaminationKompositadhesiveAdhäsive ZahnheilkundeMikrozugversuchadhesive dentistrysaliva contaminationsaliva decontaminationSpeichelkontaminationdentincomposite
DFG-subjects
DentinSpeichelAdhäsionZahnmedizin
DDC-Numbers
610
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Kisters, Svenja: Auswirkung verschiedener Maßnahmen zur Speicheldekontamination auf den Adhäsivverbund zwischen Dentin und Komposit. : Philipps-Universität Marburg 2023-03-21. DOI: https://doi.org/10.17192/z2023.0267.
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This item has been published with the following license: In Copyright