Clinical Research Directory

NobelZygoma TiUltra Implant System Study

The goal of this prospective study is to assess short term (12-months) clinical outcomes of NobelZygoma TiUltra implants and Multi-unit Abutment Xeal in the rehabilitation of participants with severely atrophic maxilla treated with zygomatic dental implant procedure. The main goal is to assess the sinusitis occurrence at 12-months after implant insertion. Other objectives are to assess: soft tissue health; biological and technical complication; patient's experience, outcomes (sinonasal symptoms and oral health-related quality of life) and satisfaction; clinician's experience with handling of device and satisfaction; implant, abutment and prosthetic survival and adverse events. Participants will be asked to complete questionnaires at pretreatment visit, postoperative visit, and after 6-months and 12-months of implant insertion. At 12-months a radiological exam (CBCT) will be asked for the participant for the evaluation of the radiological condition of the maxillary sinus.

Comparing Scanning Accuracy of Full-Arch Maxillary Implants: Extraoral vs. Intraoral Techniques

Data acquisition from the patients: After 4 months of implant placement, three impressions/scans will be made for each patient as follows: Data 1: conventional impression using open tray transfer copings and silicon impression material. After cast verification, the scan bodies will be connected to the analogues on the master cast, which will be scanned using a laboratory scanner. The STL file will be used as a reference scan. Data 2: The scan bodies will be connected to the implants intraorally, and an intraoral scan will be made using the intraoral scanner. The STL file will be stored for comparison. Data 3: the scan bodies will be splinted using dental floss after being connected to the implants intraorally and then a scan will be made using the intraoral scanner. The STL file will be stored for comparison. \- Data alignment and accuracy measurements: The accuracy measurement will be done based on ISO 5725 in which a combination of trueness and precision was approved to define the accuracy of the measurement method. (15) The scanned data will be compared as follows: the STL files from the intraoral digital scans (data 2 and 3) and the extraoral scan of the master cast (data 1) will be imported into a 3D inspection software program that is a metrology program used to analyse and compare 3D meshes. The information for both reference and targets (the scanned data to be compared) will be uploaded into the program and the area of interest of 3D meshes will be marked, The "3D Compare" function will be employed by projecting all paired points with a colour-coded map created to display the deviation patterns of the investigated surfaces. The superimpositions will be used to assess the 3D accuracy for both the digital intraoral scans with the extraoral scan of the verified stone casts. \- Statistical analysis: Data will be collected, analysed, and then tabulated.

Clinical Study Investigating the Efficiency and Complications Related to Two Different Procedures Used for the Preparation of Dentures Applied in Patients With Edentulous

The principal aim of the study is to evaluate the prosthetic complications with CAD-CAM fabricated provisional prostheses and denture conversion prostheses after 3 months of function. Supported restorations are now a predictable treatment modality for the rehabilitation of complete and partially edentulous jaws.Immediate loading of the placed implants is performed for the rehabilitation of the edentulous arch to improve patients' function. This can be usually done by converting the existing denture base of the patient or by making a CAD- CAM milled provisional prosthesis integrating digital workflow. A laboratory fabricated denture base can be converted into a screw-retained provisional prosthesis post implant placement. This is known as conversion prosthesis. However, drawbacks of these prostheses include increased chairside time for the clinician leading to inconvenience for the patient and a potential for an error in prosthesis fabrication. With the introduction of CAD-CAM technology, it is now possible to fabricate a provisional restoration using digital workflows. This workflow would help the clinicians save a considerable amount of chairside time and obtain potentially stronger restorations better polished and without contamination of surgical field. Studies assessing the soft tissue response and patient-reported outcome measures between denture conversion and CAD- CAM fabricated provisionals are currently lacking in the literature.