Clinical Research Directory

Immediate Restoration of a New Implant With High Primary Stability

The main objective of this scientific study is to evaluate the short-term (1-year) survival and success rates of dental implants restored immediately compared to implants restored after a three-month healing period. The total duration of the study is 12 months following implant placement, during which clinical and radiographic evaluations will be carried out at different follow-up time points.

Using Different Biomaterials to Preserve Bone After Tooth Extraction

This clinical study aims to evaluate the effectiveness of different biomaterials in alveolar socket preservation following tooth extraction. Participants will be allocated into three groups: (1) dentin graft, (2) dentin graft combined with hyaluronic acid, (3) allograft and (4) natural healing without any grafting material (control group). At 4 months post-extraction, dental implants will be placed, and bone biopsies will be obtained during the procedure. These biopsy samples will be subjected to histological analysis to assess new bone formation and graft integration. The study will contribute to the understanding of biomaterial performance in socket preservation prior to implant placement.

Augmentation of Peri-implant Keratinized Mucosa Using a Combination of Free Gingival Graft Strip With Platelet-Rich Fibrin

This clinical trial aims to evaluate the clinical effectiveness of combining a strip free gingival graft (sFGG) with Platelet-Rich Fibrin (PRF) for increasing keratinized mucosa around dental implants. The study compares this combined technique with the conventional free gingival graft (FGG) method through three primary objectives: 1. comparing the increase in keratinized mucosal height at immediate post-op, 1, 4, and 6 months; 2. assessing post-operative pain levels at 1, 3, 7, and 14 days; 3. evaluating soft tissue aesthetic outcomes at 4 and 6 months post-surgery.

Titanium Zirconium (TiZr) Mini Implants

H0: "Within the first year post-placement, four interforaminally placed, immediately loaded 2.4 mm narrow-diameter one-piece TiZr implants with miniaturized stud-type attachments show improved patient-reported outcome measures (PROMS) compared to two interforaminally placed, early loaded, TiZr two-piece implants with stud-type attachments to retain a mandibular overdenture."The specific aim is to compare both treatment alternatives to evaluate which one may be recommended for elderly edentulous patients.

Implant-related Outcomes in the Context of Maxillary Sinus Lifting

The population of interest will be recruited out of a cohort of patients who were initially treated at the Department of Oral Surgery and Stomatology between 1997 and 2001. The findings from a total of 56 patients that received tooth replacement treatment with dental implants during this period, were previously published in 2008. Now, 20 years later, the investigators will potentially recruit and re-examine as many patients as possible out of this original cohort. Exclusion criteria will be patients not able to come to the re-examination, concomitant diseases that compromise the health of this subject during the comprehensive examination (i.e., active severe infectious diseases, liver or kidney dysfunction/failure, currently under treatment), pregnant women, or unwilling to sign the consent form. Besides them, no further exclusion criteria are defined as patients receiving no intervention. The investigators assume that will be able to retrieve 40 patients having roughly 80 implants with sinus floor augmentation. Recruitment, screening, and informed consent procedure Patients treated at the Department of Oral Surgery between 1997 and 2001 and who were included in the previous case series study will be potentially recruited. Patients who are willing to participate will receive informed consent. The risks and benefits of being part of this study will be thoroughly explained to the patients without a limit of time. All the questions will be answered. After signing the informed consent patients will be examined. The participants will not be charged any costs for the recall examination. Study procedures After ethical approval, available patients will be screened and recruited for a re-examination visit. The anamnesis of the patients will be assessed using a questionnaire. In case of uncertainties regarding the medical history, a report from the patient's physician will be requested. During this re-examination, photographs, in combination with a comprehensive and standard clinical and digital examination will be taken. Further, patients will be given questionnaires to assess patient-reported outcomes. The evaluation visit will take place within a maximum of 1 hour, as the normal time required for a recall appointment on this type of patient with the presence of dental implants. Besides this one re-examination, no more visits will be necessary for the study outcomes. Data will be encrypted and collected in Redcap Software. The key for the encryption will be set up and stored by a person who is not involved in the study.

Evaluation of the Effect of Leucocyte Platelet-Rich Fibrin (L-PRF) Technique Applied in Post-extraction Sockets Before Placement of Dental Implants

Aim of study: The application of L-PRF membrane in post-extraction sockets outmatches the use of a) allograft covered with a collagen fleece b) allograft combined with L-PRF membrane c) natural healing, with reference to bone remodeling and regeneration of post-extraction sockets. Moreover, it will be examined whether the application of L-PRF membrane leads to faster bone maturation and creation of a favorable biological environment for earlier implant placement. Materials and methods: This study is taking place in Athens University Dental School, in Oral and Maxillofacial Surgery Clinic. All patients participating in the present study received thorough informed consent. All forty patients participating in this study, were subjected in at least one atraumatic and flapless extraction of a single rooted tooth in the maxilla or mandible. Then, the patients were randomly divided in four categories with regards to management of the socket: a) no intervention i.e. Natural healing b) application of L-PRF membrane in the socket c) application of allograft (Phoenix) covered with a collagen fleece d) application of allograft (Phoenix) covered with a L-PRF membrane. Interrupted sutures will be performed for the four extraction socket groups. Radiographic examination (localized CBCT) was obtained immediately before the extraction, as well as three months post-operatively (localized CBCT) in order to assess the changes in the alveolar ridge dimensions. The next stage of the study refers to the rehabilitation of the edentulous region. Before each patient was subjected to dental implant placement, a bone biopsy was obtained. Therefore, all the biopsy specimens obtained went through histological evaluation in order to assess qualitative and quantitative features.

Anterior Mandibular Region for Immediate Implant Placement

Immediate implant placement has been proven to be a successful treatment modality, it is however considered a technique sensitive procedure, which mandates careful planning on basis of the recommended guidelines and thorough site assessment. The anatomical characteristics play a major role in the treatment planning, to determine that enough alveolar bone housing is available to accommodate the implant in the correct prosthetic-driven position and to avoid complications that may be caused by injury of the adjacent anatomical structures. There is scarcity in the literature regarding data on the anatomical features of the mandibular anterior zone in relevance to immediate implant planning. Analysis of the anatomical landmarks of the mandibular anterior region to determine the thickness of the labial and lingual alveolar bony plates, in addition to the bony socket configuration along with the labio-lingual socket dimension and relate them to immediate implant treatment planning

Comparative Analysis of 2 Bone Graft Materials in Socket Preservation

Socket preservation procedures after tooth extraction have been designed and implemented to maintain the volume of the bone and gingival tissues, which can decrease following the extraction of the teeth. In this clinical trial we will compare clinically and histologically the effectiveness of two distinct bovine bone graft materials; an allograft and a xenograft, in alveolar ridge preservation procedures following tooth extraction .

Dental Implant Healing With TNF-Alpha Inhibitors

The goal of this pilot study is to learn about healing after dental implant placement in patients taking a class of biologic drug called Tumor Necrosis Factor or TNF-alpha antagonist or inhibitor. The main questions it aims to answer are: Do patients taking TNF-alpha inhibitors have any complications after the placement of dental implants? Do patients taking TNF-alpha inhibitor experience increased pain after dental implant placement compared to the expected levels when healing from this procedure? Researchers will recruit patients both taking these drugs and those not taking these drugs to compare the outcomes between the two groups. Participants missing teeth will be recruited to receive dental implants to meet ideal dental status and will be followed before and after the implant placement to determine levels of health and ensure proper healing. Participants will be followed for a total of one year and follow up visits will consist of both clinical examination and radiographs (x-rays) to evaluate bone level and implant status. Participants will also be asked to rate their pain during clinic visits and at home on a diary and record the amount of pain control medication they take after the implant procedure.

Clinical Evaluation of a Hyperbolic Paraboloid Triple-Abutment on Morse Taper Dental Implants

This prospective clinical study aims to evaluate the clinical and radiographic outcomes of a novel triple-abutment system with hyperbolic paraboloid geometry installed on Morse taper dental implants. The system is designed to support three adjacent crowns on a single implant, aiming to optimize load distribution and preserve peri-implant tissue stability. Thirty systemically healthy adults missing three adjacent teeth will undergo implant placement, followed by a healing period of approximately three months for osseointegration prior to prosthetic loading. Metal-ceramic restorations will then be cemented over triple abutments. Clinical and radiographic evaluations will be performed at T1 (3-4 months after prosthetic loading) and T2 (12-18 months after prosthetic loading). The primary outcome will be marginal bone level change assessed by standardized periapical radiographs. Secondary outcomes include probing depth, bleeding on probing, plaque index, keratinized mucosa height, and patient-reported satisfaction. The study aims to investigate whether this innovative abutment design provides stable peri-implant conditions and favorable clinical performance when applied to Morse taper implants.

Movement of Dental Implants During Osseointegration

Prospective multicenter observational study assessing whether dental implants undergo three-dimensional positional change between placement (T0) and pre-loading after osseointegration (T1). Two intraoral scans (STL) will be superimposed to quantify linear (mm) and angular (degrees) displacement. Clinical variables include insertion torque, primary and secondary ISQ, anatomical site, placement timing, operator-perceived bone density (Lekholm \& Zarb), bruxism, and night guard use. The primary endpoint is the 3D displacement at \~3-4 months. Multivariable analyses will explore associated factors.

Impact of Microneedling on the Gingival Tissue Surrounding Implant Supported Fixed Restoration.

This randomized clinical trial aims to evaluate the effect of microneedling with and without accelerated growth factor (AGF) injection on gingival tissue surrounding implant-supported fixed restorations. The peri-implant soft tissue phenotype is an important determinant of long-term implant stability and esthetic success. Patients with thin gingival biotype are more susceptible to mucosal recession, soft tissue transparency, and peri-implant complications. Enhancing gingival thickness and keratinized tissue width using minimally invasive methods can improve esthetic and biological outcomes. Microneedling has recently been proposed as a simple and minimally invasive approach that stimulates local healing by inducing controlled micro-injury. It triggers angiogenesis and the release of intrinsic growth factors that promote soft tissue regeneration. Accelerated Growth Factor (AGF) is an autologous platelet concentrate obtained through a single-step centrifugation technique. It contains a high concentration of platelet-derived and vascular growth factors that enhance tissue repair and collagen synthesis. Combining microneedling with AGF may therefore produce synergistic effects, improving the soft tissue phenotype and peri-implant mucosal stability. The study will include 20 participants aged 18-34 years with thin gingival biotype (0.8-1 mm) around maxillary anterior implants. Participants will be randomly assigned to one of two groups: 1. AGF group: AGF injection alone. 2. Microneedling + AGF group: Microneedling using sterile disposable lancets until pinpoint bleeding occurs, followed by AGF injection (0.2-0.3 mL per site). Clinical parameters including gingival thickness (GT), keratinized tissue width (KTW), probing depth (PD), and bleeding index (BI) will be recorded at baseline, 3 months, and 6 months. All participants will receive standardized zirconia restorations following osseointegration. Statistical analysis will include intra- and inter-group comparisons, with significance set at p \< 0.05. The study is expected to clarify whether combining microneedling with AGF enhances peri-implant soft tissue thickness more effectively than AGF alone. If successful, this combined minimally invasive approach may offer a practical and biologically based technique to improve soft tissue health and esthetics around dental implants.

Creos Xenoprotect PMCF

The goal of this retrospective PMCF study is to assess safety and performance of creos xenoprotect in all indications functioning as dental barrier membrane. The primary endpoint of the study is the occurrence of major complications during 6 months after creos xenoprotect placement whereas the hypothesis is that these major complications occur in less than 5% within this timeframe. This is a retrospective, multicenter clinical investigation with consecutive cases. Data will be collected on consecutive data cases from patient files, given that these patients were treated within a defined indication with creos xenoprotect in the past. Patients participating in this study do not have any obligations or need to come back for any intervention. A total of 11 centers are planned to be included. Sample size is n=200 patients and is distributed equally in four indication groups: Group 1: Ridge augmentation (vertical and horizontal) Group 2: Alveolar ridge preservation Group 3: Sinus floor augmentation Group 4: Augmentation around implant or teeth

Natural Bioactive Gel for Peri-Implantitis

This study is a randomized controlled clinical trial using a split-mouth design to evaluate the effectiveness of a natural bioactive gel (Sterify Gel®) as an adjunct to standard non-surgical therapy for peri-implantitis. Peri-implantitis is an inflammatory disease that affects the tissues around dental implants and can lead to bone loss and implant failure. The goal of the study is to determine whether the application of Sterify Gel®, which contains polyvinyl polymers, hydroxytyrosol, magnesium ascorbyl phosphate, and nisin, can improve clinical outcomes when used in addition to conventional mechanical debridement and air-polishing. The trial will include 20 patients, each with at least two implants in different quadrants affected by peri-implantitis. One implant will be treated with standard therapy plus the gel (test site), while the other will receive standard therapy alone (control site). Clinical outcomes will be measured over a 9-month period, including plaque levels, bleeding on probing, probing depth, suppuration, and bone loss. The results will help assess whether this gel enhances the effectiveness of routine non-surgical peri-implantitis treatment.

Soft Tissue Volume Changes in Posterior Socket Sealing Abutment.

The aim is to clinically evaluate the effect of the alveolar sealing technique using a customised abutment on soft tissue volume changes following molar extraction and immediate dental implant placement.

Clinical and Radiographic Evaluation of Dentsply Sirona PrimeTaper Implants

The DS Prime Taper EV dental implant system was recently launched on the implant market by Dentsply Sirona (York, PA, USA). Dental implant systems are undergoing rapid evolution, ultimately driven by their broad therapeutic indications. As manufacturers strive to keep up with the demands of a growing market, designs are changing faster than clinical evaluation. This means that the time needed to assess medium- and long-term clinical outcomes before designs change again cannot be met. Clinicians need to have a "real" analysis of the clinical performance of implants before using them. Therefore, reporting of results is necessary to avoid use in patients without proper practical checks even before the recommended 10- and 15-year follow-up periods.

Comparison Between Two Different Healing Abutments in Single Posterior Implants

The aim of this randomized clinical trial is to evaluate the volumetric analysis of peri-implant soft tissues after 3 months of the use of a prefabricated healing abutment with scan peg in comparison to customized healing abutment.

Single Implant Crowns Supported by Narrow or Standard Diameter Implants in Molar Sites

Standard dental implants require sufficient bone and spacing, which may not be available in all patients. To address these limitations, narrow diameter implants (≤3.5 mm) have been introduced as a less invasive alternative, especially useful for medically compromised patients or those avoiding bone grafts. However, narrow implants made of pure titanium have shown long-term biological and technical concerns. The introduction of titanium-zirconium (TiZr) alloy has improved mechanical strength, and several studies have demonstrated favorable outcomes with narrow TiZr implants. Yet, evidence remains limited regarding their exclusive use in high-load posterior (molar) regions. Prior studies report conflicting failure rates, potentially linked to prosthetic design and occlusal forces, but lack quantitative analysis of bite forces or prosthetic angles. Emergence angle, prosthetic platform width, and implant-abutment connection may all influence implant stability and peri-implant tissue health. A newly introduced TorcFit™ connection may offer better stress distribution and torque resistance, but its clinical relevance-especially in narrow implants used for molars-remains untested.

Study Evaluating the Performance and Safety in the Medium and Long Term of Global D ZygoFixU System

Global D has developed an zygomatic implant prosthetic system (ZygoFixU range): zygomatic implants, prosthetic parts and associated instruments. These devices have a design similar to other zygomatic implants on the market and are therefore not innovative. These non-CE marked devices are assessed during investigation 2302-G-ZYGO-C for their performance and for their short- and medium-term safety. These implants will be placed using specific instruments, by oral or cranio-maxillofacial surgeons with significant experience in the placement of zygomatic implants and trained in clinical research.

Variable-thread Versus Standard Dental Implants for Replacing Missing Teeth

Background and objectives: Primary and secondary implant stability remain the most relevant and reliable clinical indicator for long-term survival of dental implants. Hence modifications of surface characteristics and implant macro-designs were introduced over the last two decades to enhance osseointegration during the initial phase of healing. In this context, a variable-thread self-cutting implant design was recently introduced to improve primary stability. At present, there are limited number of studies that evaluated this variable-thread implant design. These studies were mostly experimental, of short duration and limited number of participants. Therefore, the aim of the present randomized controlled trial is to compare two implant designs (variable-thread versus standard) in terms of clinical, radiographic and patient-reported outcomes. Methods: A total of 24 participants, who require replacement of a posterior single tooth with dental implant, will be randomly allocated to two equal sized groups. In the test group, the participants will receive variable-thread implants, while standard implants will be placed to replace missing teeth in the control group. In addition to evaluating implant stability, the trial will also report on clinical and radiographic implant outcomes at various time points.

Marginal Bone Level Around Titanium Implants Produced by Additive Manufacture

The aim of this study will be to evaluate the non-inferiority of implants produced by additive manufacture loaded in 30 days when compared with those loaded in 90 days, in relation to marginal bone loss, after 01 (one) year of follow-up

Zirconia Implants: Practice-based Evidence

This study is a prospective case series clinical study to examine the effectiveness of Ceramic dental implants manufactured by Swiss Dental Solutions (SDS). Participants with an indication from the dentist for teeth extraction and replacement are invited to participate in this study. Participating in this study will involve the use of dental implants manufactured by Swiss Dental Solutions (SDS zirconia dental implants), submission of the case data, including pre-operative information, intra-operative details, and post-operative follow-up data, to the study site and its collaborating partners. The SDS zirconia dental implants used in this research are FDA cleared devices that are available for dental treatments.

Atraumatic Zirconia Abutment Versus Customized Composite Healing Abutment in Maxilla or Mandible.

40 patients are included in the study, 20 patients in group 1 (=closure with composite material shaper; test group) and 20 patients in group 2 (=closure with custom-made zirconia oxide abutment; control group). Randomisation envelopes will be used for randomisation. Device under study: Straumann BLX, Roxolid® , SLActive® dental implants with a diameter of 3.5, 3.75, 4, 4.5 mm are used. Allogenic bone botiss maxgraft® cortical granules are used as graft material. Inclusion criteria: 1. Males and females at least 18 years of age or older. 2. One implant per patient. 3. Prior to any study-related activity, the subject must voluntarily sign informed consent, be willing and able to attend scheduled follow-up visits, and agree to the collection and analysis of pseudonymised data. 4. Lateral individual teeth (premolars and molars). 5. Class I extraction socket (intact buccal wall) or class II (1/3 of buccal wall). 6. The gingival contour of the tooth to be extracted - without recession. 7. Adjacent anterior teeth have no periodontal loss. 8. There are no implants in the adjacent teeth. 9. Non-traumatic tooth extraction, which results in intact walls of the socket. Exclusion criteria: 1. Deep occlusion (severe, class II). 2. The patient smokes a lot (more than 10 cigarettes per day). 3. Systemic disease (osteoporosis). 4. No initial stability has been achieved after the implant insertion procedure.

Study Evaluating the Performance and Safety in the Medium and Long Term of Global D Implant-prosthetic Systems

This study is set up within the framework of the European Union regulation 2017/745 on medical devices. Its objective is to confirm the performance and safety in the medium and long term of implant-prosthetic systems including Global D dental implants: In-Kone® UNIVERSAL, In-Kone® PRIMO, twinKon®, EVL® S, EVL® K and EVL® C.