Gross, Goeran and Schmohl, Leonie and Fuchs, Florian and Guenther, Elena and Schulz-Siegmund, Michaela and Schoengart, Jann and Hahnel, Sebastian and Koenig, Andreas (2023) Retention force, translucency, and microstructural properties of translucent temporary luting cements: An in vitro study. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, 142: 105781. ISSN 1751-6161, 1878-0180
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The aim of the study was to investigate the retention behaviour (pull-off force include adhesive remnant index = ARI) as well as translucency of various temporary luting cements and use microstructure elucidation methods to formulate explanatory approaches to their mode of action. The retention force of the temporary luting cements Provicol QM Plus (P+), Provicol QM Aesthetic (Pae), Bifix Temp (BiT), and as a reference a glass ionomer cement Meron (M) with a direct (Structur 3/S3) or an indirect (Structure CAD/SCAD) resin-based composite restauration was investigated after accelerated aging (thermocycling). Additional investigation of the physical properties was performed regarding to translucency and surface free energy. The microstructure was evaluated by X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry and micro X-ray computed tomography. All tested temporary luting cements showed different pull-off forces in the range between 3.0 and 16.8 N in combination with S3 or SCAD after thermocycling. Only BiT with S3 showed pull-off forces of 129.2 N and complete retention on the restoration (ARI = 0), which was significant (p < .001) to all other samples. High translucency (BiT > Pae > M > P+) was observed for materials with lower crystalline content and low residual mass (usally resulting from higher organic content). M showed the highest surface free energy with a predom-inantly polar fraction, while BiT had a predominantly dispersive fraction. The highest porosity was observed in the coronal region of the restoration. The results suggest that translucency of temporary luting cements can be increased with higher organic and lower cryristall content. All combinations of cements and temporary restorations (direct/indirect; with the exception of BiT/S3) showed pull-off forces below 17 N (equivalent to a weight force of similar to 1.7 kg), which allows manual detachment of the restoration by the dentist.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ZINC OXIDE-EUGENOL; IMPLANT ABUTMENTS; CROWN RETENTION; STRENGTH; Dental cements; Luting agents; Provisional luting materials; Pull-out force; Resin-based composite; Zinc oxide cement |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Jan 2024 12:15 |
| Last Modified: | 30 Jan 2024 12:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60227 |
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