OCT evaluation of the internal adaptation of ceramic veneers depending on preparation design and ceramic thickness
| Autor: | Rainer Haak, Dirk Ziebolz, Uwe Blunck, Juliane Siegner, Roland Frankenberger, Felix Krause, Hartmut Schneider, Jan Hajtó, Sabine Fischer |
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| Rok vydání: | 2021 |
| Předmět: |
Ceramics
Materials science medicine.medical_treatment OptiBond FL 02 engineering and technology 03 medical and health sciences 0302 clinical medicine Materials Testing medicine General Materials Science Ceramic Composite material General Dentistry Interfacial bond 030206 dentistry Adhesion 021001 nanoscience & nanotechnology Dental Porcelain Resin Cements Dental Veneers Mechanics of Materials visual_art visual_art.visual_art_medium Veneer Adhesive 0210 nano-technology Tomography Optical Coherence |
| Zdroj: | Dental Materials. 37:423-431 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2020.11.021 |
| Popis: | Objectives In-vitro evaluation of the influence of preparation design and thickness of ceramic veneers on the interfacial bond using optical coherence tomography (OCT). Methods Sixty-four central incisors were randomly assigned to four preparation designs differing from no to complete dentine exposure (n = 16 each): non-prep (NP), minimal-invasive (MI, no dentine exposure), semi-invasive (SI, 50% dentine) and invasive (I, 100% dentine). Ceramic veneers (IPS InLine Veneer) of two thicknesses (0.2−0.5 mm (T1) and > 0.5–1.2 mm (T2)) were etched, silanized, and adhesively luted (Optibond FL, Variolink Veneer). After water storage (37 °C, 21d), thermocycling (2000 cycles, 5°-55 °C), and mechanical loading (2 + 1 million cycles, 50 + 100 N) specimens were imaged by spectral-domain OCT (Telesto II, Thorlabs). Adhesive defects at the ceramic-composite and tooth-composite interfaces were quantified on 35 equidistantly distributed OCT B-scans (length, %). Statistical differences were verified with Wilcoxon-/Mann-Whitney-U-test (α = 0.05). Results Adhesive defects appeared in all groups at both interfaces, albeit to differing extents (0.1 – 31.7%). NP and MI veneers showed no significant differences at the interfaces (pi > 0.05). In groups, SI and I, significantly more adhesive defects appeared at the tooth-composite compared to the veneer-composite interface (pi ≤ 0.039). The following preparation designs and veneer thicknesses showed differences (pi ≤ 0.021): Veneer-composite: NP-T1 I-T2; Tooth-composite: NP-T1 MI-T2, MI-T1 Significance The interface adhesion of ceramic veneers was influenced by the preparation design and the veneer thickness. A ceramic thickness of at least 0.5 mm and a preparation without exposing dentine is advantageous for the interfacial bond. |
| Databáze: | OpenAIRE |
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