Peri-implantitis is like Damocles sword, threatening over our final results as is the most common cause of implant
failure. It is, was and will be one of the most challenging tasks for the practitioner to deal with. The rough implant
surface offers the ideal conditions for the pathogenic bacteria to stick and multiply. Even more, the growing mature
biofilm is harder to eliminate. Mechanical cleaning and rinsing is not capable to destroy it entirely. Most treatment
protocols include strong antibiotics, disregarding their side effects and interactions with other medications.
Fixed partial prostheses as integral ceramic, polymers, metal-ceramic or metal-polymers bridges are mainly used in the
frontal part of the dental arch (especially the integral bridges). They have to satisfy high stress as well as esthetic
requirements. The masticatory stress may induce fractures of the bridges. These may be triggered by initial materials
defects or by alterations of the technological process. The fractures of these bridges lead to functional, esthetic and
phonetic disturbances which finally render the prosthetic treatment inefficient. Dental interfaces represent one of the
most significant aspects in the strength of the dental prostheses under the masticatory load. The purpose of this study is
to evaluate the capability of optical coherence tomography (OCT) to characterize the dental prostheses interfaces. The
materials used were several fixed partial prostheses integral ceramic, polymers, metal-ceramic and metal-polymers
bridges. It is important to produce both C-scans and B-scans of the defects in order to differentiate morphological aspects
of the bridge infrastructures. The material defects observed with OCT were investigated with micro-CT in order to prove
their existence and positions. In conclusion, it is important to have a non invasive method to investigate dental prostheses
interfaces before the insertion of prostheses in the oral cavity.
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