Clinical Research Directory

All-ceramic Restorations: a Retrospective and Prospective Study

The goal of this observational study is to evaluate the survival and success rate of ceramic restorations on teeth and implants done in the department of fixed prosthodontics at the CHU of Liege for the last 25 years. The main question it aims to answer is: Are ceramic restorations reliable and sustainable ? Participants already treated with ceramic restoration will answer survey questions about their restoration once a year, in parallel with clinical evaluation following Hickel et al 2010 (Science Committee of the FDI World Dental Federation -FDI) to assess esthetic, functional, mechanical and biological properties of the restorations .

Abutment Hydrophilicity on Soft Tissue Morphogenesis

The goal of this clinical trial is to evaluate the effect of abutment surface bioactivation via argon plasma treatment on peri-implant soft tissue healing and integration in adult patients undergoing implant therapy. The main questions it aims to answer are: Does argon plasma treatment of healing abutments improve the quality and organization of peri-implant connective tissue compared to untreated abutments? Does the treatment influence histological parameters such as epithelial regeneration, vascularization, inflammatory infiltrate, and keratin layer thickness? Researchers will compare plasma-treated healing abutments to untreated machined-surface abutments to determine whether the bioactivated surface improves soft tissue morphogenesis. Participants will: Undergo implant placement with immediate connection of either a treated or untreated healing abutment. Have plaque and bleeding indices recorded at 3 months. Undergo a soft tissue biopsy at 3 months for histological analysis (including evaluation of inflammation, connective tissue, epithelial morphology, vascularization, and keratinization).

Effect of Bio-activation on Epithelial and Connective Cell Adhesion to Titanium Abutments: Split Mouth Clinical Trial

The aim of this "in vivo" controlled trial is to assess soft tissue cell adhesion to titanium abutments subjected to different cleaning procedures - no treatment (as they come from the industry), and cleaning by plasma- at an early healing time. In fact, the primary aim is Quantity and Quality of soft tissue adhesion at the microscopic level (e.g Fibronectin, Integrin-actin). The secondary Aim - Clinical parameters and outcomes - BOP, PPD, MBL (Marginal Bone Level to check influence of plasmapp-treated abutments). The null hypothesis of the study was that the cleaning procedure applied to implant abutments has no effect on soft tissue cell adhesion and MBL at an early healing time.