Clinical Research Directory

Peri-implant Mucosal Changes Over Time Following Implant Provisional Removal in the Esthetic Zone

The study will examine the temporary volumetric change that happens in the gums around an implant crown when the crown is removed. The main question of the study is "how much time has to pass to see a significant change, especially when there could be a need to make a mold of the surrounding gum to make a new crown?" The area of the implant crown will be scanned with an intra-oral scanner over a period of 15 minutes.

Bone Particles Sizes and the Stability of Soft and Hard Tissue in Aesthetic Area

After implant restoration, the surrounding tissue, including the gingiva and alveolar bone, will inevitably reconstruct. The study found that gingival recession was easy to occur in the aesthetic area of upper anterior teeth within 1 year after implantation, which was mainly due to the absorption of labial alveolar bone. In order to avoid absorption, the thickness of the labial bone plate should not be less than 2mm, which is difficult to achieve in the anterior tooth area. Therefore, guided bone regeneration (GBR) should be performed in the implant area, which can provide more than 5mm bone increment in the vertical and horizontal positions with long-term stability, being beneficial for the maintenance of the buccal contour and the stability of the soft and hard tissues in the aesthetic area. In this study, the inorganic bone matrix extracted from bovine bone (Geistlich, Gegreen, Haiao, etc.) was used for GBR in the area with insufficient bone volume in the anterior dental implant area. The commercially available xenogeneic bone graft substitutes can be divided into large particles (1-2mm) and small particles (0.25-1mm) according to the particle size. Previous studies have found that in 6 months after implantation, the change of vertical bone height around the implant (i.e. the height from the top of alveolar ridge to the shoulder of the implant) is related to the particle size of bone powder, and large particles of bone powder may have better performance in maintaining the vertical bone height due to the following reasons: 1. Large bone particles may show better mechanical properties and better mechanical compression resistance. 2. Large bone particles may show more reasonable pore size and porosity, which may provide better environment for the growth of new bone. 3. Large bone particles may achieve more reasonable and balanced bone remodeling. However, the effect of bone particle sizes on the maintenance of soft and hard tissue around the bone graft area is still inconclusive. Thus, the purpose of this study is to compare the effects of large and small bone particle sizes on the stability of soft and hard tissues around the bone graft area within 3 years after implant restoration in the anterior tooth area.

Perioperative Oral Vitamin D3 Supplementation on Implant Osseointegration

The number of patients treated in Implantology at Nantes University Hospital is 400 per year. This pilot study aims to demonstrate the efficacy of a 6-month oral cholecalciferol supplementation on osseointegration in patients requiring dental implants and presenting with vitamin D deficiency, compared to French patients who have not undergone vitamin D screening

Clinical Comparison of On1 Two-stage Abutment With One-stage Abutment on Different Implant Neck Design

In clinical implant treatment, the healing abutment or temporary abutment needs to be removed or replaced multiple times after implant insertion and before prosthesis restoration. During this process, the friction between connective tissue around the implant cannot be avoided. Different from natural periodontal tissue, soft tissue around the implant lacks the periodontal ligament barrier and periodontal ligament blood supply, and is more likely to be damaged during repeated wearing. The integrity, health and stability of the peri-implant connective tissue is crucial to the implant osseointegratio. Through randomized controlled trials and meta-analysis, Marco Tallarico et al found that repeated removal of one-stage abutments can significantly increase bone resorption. Based on this situation, the design of implant neck and abutment, especially the design concept of smooth collar, has attracted widespread attention. The design of smooth collars with different heights can isolate the mechanical damage of the abutment to the connective tissue around the implant to different degrees. Among them, the On1 two-stage abutment has a smooth collar with a height of 1.75-2.5mm, and the Nobel implants have a smooth neck design ranging from 0-0.75mm to protect the connective tissue around the implant. Through a systematic review and meta-analysis, Qing-qing Wang et al concludes that direct mechanical stimulation from the abutment has long-term adverse effects on peri-implant connective tissue and bone tissue. However, whether the On1 two-stage abutment has a positive effect on the stabilization of the peri-implant soft tissue and bone tissue remains to be studied. At the same time, the relative height of the smooth collar increased by the On1 abutment in the implants with different neck designs varies to some extent, and further research is still needed to provide evidence about the effect of the On1 abutment on the tissue surrounding the implants with different neck designs. In conclusion, this study took On1 two-stage abutment and traditional one-stage abutment as the research objects to compare and evaluate the clinical effects of the two in different implant neck design.

Photofunctionalization With UVC

Summary: Objective: The general objective is to compare the placement of standard implants with a surface photofunctionalization technique based on ultraviolet C radiation (UVC), having as working hypothesis that this photofunctionalization will accelerate the bone apposition on the implant surface and increase the amount of bone that binds to the implant, making it possible to load these photofunctionalized implants in less time. Design: Pilot, clinical, randomized, prospective, controlled, single-center, prospective study. Scope of the study: Master's Degree in Oral Surgery and Implantology. Faculty of Dentistry. Complutense University of Madrid. Subjects of the study: patients attending the Master's Degree in Oral Surgery and Implantology for rehabilitation with dental implants, regardless of the sector in which they have missing teeth. Key words: ISQ (implant stability quotient), inmediate loading, UVC, dental implants.

Evaluation of the Effect of Osseodensefication Technique Versus Conventional Implant Drilling Technique in Implant Supported Mandibular Overdenture

The present study will be performed to : evaluate the effect of two implant placement systems )conventional method and osseodensification method) radiographically on bone density and bone height surrounding the implant by using CBCT and clinically by probing depth and gingival index.

Characterizing the Inflammation Around Dental Implants: Bacterial Infection, Hypersensitivity or Both?

The use of titanium dental implants has become a common modern treatment to restore teeth. Although the success rate of dental implants is high, inflammation around the dental implant still occurs. The current study will investigate if the inflammation around the implant is due to bacterial infection, hypersensitivity or both.

Radiographic Assessment of Bone Gain Following Sinus Lifting With Simultaneous Implant Placement Using Crestal Approach With Membrane Control Technique for Bone Augmentation of Atrophied Maxillary Posterior Ridge

This study aims to evaluate the quantity and quality of the native and the newly bone around dental implants that's simultaneously installed with sinus lifting

Effect of Static Magnetic Field on Dental Implant Stability.

To evaluate the effect of static magnetic field on dental implant to bone integration.