Clinical Research Directory

Influence of Zirconia Abutments on Peri-Implant Tissues in Single-Tooth Restorations

Objectives: To compare the influence of pre-fabricated titanium abutments and customized milled zirconia abutments on implant biocompatibility and the peri-implant region, as well as on radiographic bone loss and oral health-related quality of life. Detailed Methodology: This study is a randomized controlled clinical trial designed to evaluate the biological and clinical behavior of standardized titanium abutments compared with customized anatomical zirconia abutments in single implant-supported posterior restorations. The present investigation represents the prosthetic phase of a previously conducted randomized clinical trial that evaluated dimensional changes following different alveolar preservation protocols in posterior regions (CAAE: 59208422.8.0000.5418). In the previous phase, participants underwent tooth extraction and alveolar preservation procedures, followed by implant placement with Morse Taper (CM) implants (Biomorse XP, Bionnovation Biomedical) after a six-month healing period. After implant osseointegration, participants eligible for prosthetic rehabilitation will be randomly allocated to one of two parallel groups using a computer-generated randomization sequence (Sealedenvelope.com). The allocation ratio will be 1:1. Sample size calculation was performed using GPower software to ensure adequate statistical power. The intervention consists of prosthetic rehabilitation with either standardized titanium abutments (TiB group) or customized anatomical zirconia abutments (ZiT group), both supporting single zirconia crowns in posterior regions. All prosthetic and laboratory procedures will follow standardized clinical protocols. Clinical and laboratory assessments will be conducted at prosthesis delivery (baseline) and at 1-, 3-, 6-, and 12-month follow-up visits. Data collection will include peri-implant crevicular fluid (PICF) and biofilm sampling for biomolecular analysis, comprehensive periodontal clinical parameters, measurement of keratinized mucosa thickness, standardized periapical radiographs for marginal bone level assessment, and intraoral digital scanning for volumetric and soft tissue analysis. The primary objective is to compare peri-implant tissue stability and biological response between titanium and zirconia abutments. Secondary outcomes include clinical parameters, marginal bone level changes, and soft tissue dimensional stability over a 12-month follow-up period. This study aims to contribute to the understanding of how abutment material and design may influence peri-implant health and long-term tissue stability in posterior implant-supported restorations.

Prospective Longitudinal Clinical Study for the Evaluation of Peri-implant Tissue and Osseointegration After Rehabilitation With Osseointegrated Implants

The success of rehabilitation with osseointegrated implants is associated with numerous factors, including patient characteristics, installed implants, proper planning, and the prosthetic connections used. In the long term, success is closely related to the clinical radiographic follow-up of the implanted region and the identification of intrinsic or extrinsic factors that may interfere with implant survival. Therefore, the objective of this study is to evaluate, through clinical and radiographic analysis, the peri-implant tissues and prosthetic connections of research participants rehabilitated with osseointegrated implants at the Implant Dentistry Clinic of the Federal Fluminense University, over a period of 5 years. This will be a double-blind longitudinal study. A total of 148 research participants will be selected, respecting the inclusion criteria: completion of surgical-prosthetic planning by the Implant Dentistry Clinic team at UFF, including osseointegrated implants and prosthetic components manufactured by SIN Implant System (São Paulo, Brazil); agreeing to and signing the informed consent form, being willing to be monitored for a period of 5 years; systemically healthy patients who do not use antiresorptive and antiangiogenic drugs; patients with a plaque index \<20% (Ainamo \& Bay 1975) and bleeding on probing \<20% (Muhlemann \& Son 1971) at the start of the study. Participants will undergo clinical and radiographic analysis of peri-implant tissues and prosthetic connections at the following intervals: up to 7 days after implant installation (Time 0), at the time of prosthesis installation (Time 1), 6 months after prosthesis installation (Time 2), and 1 to 5 years after prosthesis installation (Times 3, 4, 5, 6, and 7, respectively). It is expected that this longitudinal study will lead to a better understanding of the factors influencing peri-implant bone loss and long-term success.

Comparison of the Effectiveness of Two Different Surgical Therapeutic Protocols of Peri-implantitis

The purpose of the present study is to compare the 1-year clinical, radiographic and microbiological outcomes and patients' satisfaction following surgical treatment of peri-implantitis after applying two different surface modification methods. Secondarily, analysis and comparison of the microbiological results of implants diagnosed and treated for peri-implantitis with healthy implants will be performed.

Monitoring of Implant Diseases: Diagnosis and Monitoring With aMMP-8 Test Technology

68 patients underwent the aMMP-8 chair-side test as well as clinical traditional measurement methods. Those who had one or more implants in their mouth were selected as patients. The condition of the attachment tissues of these implants is monitored at a control visit after five years.