Details

Autor(en) / Beteiligte

• Durand, J.-C.
• Slangen, P.
• Montresor, S.
• Desoutter, A.
• Solieman, O.Y.
• Fages, M.
• Picart, P.

Titel

Behavior of CAD/CAM ceramic veneers under stress: A 3D holographic study

Ist Teil von

• Journal of the mechanical behavior of biomedical materials, 2021-06, Vol.118, p.104436-104436, Article 104436

Ort / Verlag

Netherlands: Elsevier Ltd

Erscheinungsjahr

2021

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Ceramic veneers restorations may undergo damages, such as cracks, fractures, or debonding. Full-field measurements must be carried out in order to visualize and analyze the strain fields. This paper demonstrates that digital holography permits to investigate the mechanical behavior under stress of a natural incisor and a natural incisor reconstructed with CAD/CAM ceramic veneer. The facial surface of a maxillary central incisor is prepared to receive a monolithic ceramic reconstruction manufactured using a chairside computer-aided design and computer aided manufacturing (CAD/CAM) system (Cerec AC® system, Sirona Dental System®, Bensheim, Germany). One incisor is kept intact for comparison. The samples are sectioned longitudinally to obtain a planar observation of the region of interest. A mechanical indentation head and digital holographic set-ups permit a full-field, contact-less and single-shot measurement of the three-dimensional displacement fields at the surface of the tooth sample when subjected to load. Stain fields are then estimated and comparison of the results between two samples can be carried out. 3D displacement, fields and strain fields are measured and highlight the behavior of the region of interest in three directions of space for the ceramic veneer and the natural incisor. The strain maps reveal the local behavior, especially the concentration or the sudden change in strain. The transition zones are clearly observed, particularly for the veneered sample. Digital holography highlights the localization of stress concentration zones in regions of interest and yields comparative analysis between samples with different tooth preparations. holography permits to visualize and compare the mechanical response of the ceramic veneer and natural tooth. This helps choosing the mechanical properties of the bonding interface. [Display omitted] •On 3D holography, intact natural dentin-enamel junction aids stress accommodation.•3D holography investigates the glue junction and highlights stress concentrations.•3D holography shows the cervical finish line or glue type that best accommodates stress.•Multi-wavelength digital holography is emerging in mechanics/dental biomechanics.