Clinical Evaluation of Two Different Attachment System

NCT ID: NCT04544839

Last Updated: 2022-06-24

Basic Information

• Recruitment Status: ENROLLING_BY_INVITATION
• Clinical Phase: NA
• Total Enrollment: 26 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2020-11-02
• Study Completion Date: 2028-01-31

Brief Summary

Edentulous patients commonly experience a deterioration in the quality of life; both in terms of oral and general health. Studies demonstrated that conventional dentures do not adequately restore masticatory function nor quality of life. In contrast, implant-supported overdentures are considered the standard of care for edentulous patients as they offer a more stable prosthesis that ultimately results in improved oral function and patient satisfaction.

Precision attachments such as studs, magnets, telescopic crowns or a bars are commonly used for implant supported overdentures. Implant overdentures supported by stud attachments gained popularity for the rehabilitation of edentulous patients as they are self-aligning, offer dual retention and compensate for divergence between implants up to angles of 40 degrees.

However, it has been documented that the stud attachment system (Locators) requires a high frequency of maintenance, particularly with regard to the replacement of the matrix.

In order to overcome some of these limitations of existing attachment systems, a newer system was developed consisting of a matrix made of polyetheretherketone (PEEK) instead of a polymeric material. This system has an amorphous diamond like carbon-based abutment coating (ADLC) and it was claimed to be more resistant to wear.

Clinically and in vitro, no comparative studies have been performed addressing wear and retention of the traditional stud attachment and the newer ADLC attachment.

Thus, the aim of the present study is to clinically and in vitro evaluate the ADLC and study attachment system.

Conditions

Dental Implant

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: CROSSOVER
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

ADLC attachment in first phase

Each patient will receive 2 implants in the canine region. Three months later, each patient will be randomized and half of the patients will receive first the ADLC (test) device (first phase). In the second phase of the crossover trial (6 months after the start of the first phase), the attachments will be replaced. Patients previously allocated to the ADLC group will receive the LOC attachments.

Group Type: EXPERIMENTAL

ADLC attachment system with PEEK inserts

Intervention Type: DEVICE

Each patient will receive 2 implants in the canine region using a guided-surgery protocol and a pre-prepared surgical stent. A healing abutment of an adequate size will be placed on the implant for transmucosal healing. The flaps will be subsequently sutured around the healing abutments. Patients' existing prostheses will be adjusted. Suture removal will be performed one week post implant placement.

Three months later, implant level impressions will be made using the open tray technique. Each patient will be then be randomized using eCRF (electronic Case Report Form) to either ADLC group or LOC group. A final cast of the patients will be obtained and the attachments will be installed using an in-direct technique by a calibrated prosthodontists.

LOC attachment in first phase

Each patient will receive 2 implants in the canine region. Three months later, each patient will be randomized and half of the patients will receive first the LOC (control) device (first phase). In the second phase of the crossover trial (6 months after the start of the first phase), the attachments will be replaced. Patients previously allocated to the LOC group will receive the ADLC attachments.

Group Type: ACTIVE_COMPARATOR

ADLC attachment system with PEEK inserts

Intervention Type: DEVICE

Each patient will receive 2 implants in the canine region using a guided-surgery protocol and a pre-prepared surgical stent. A healing abutment of an adequate size will be placed on the implant for transmucosal healing. The flaps will be subsequently sutured around the healing abutments. Patients' existing prostheses will be adjusted. Suture removal will be performed one week post implant placement.

Three months later, implant level impressions will be made using the open tray technique. Each patient will be then be randomized using eCRF (electronic Case Report Form) to either ADLC group or LOC group. A final cast of the patients will be obtained and the attachments will be installed using an in-direct technique by a calibrated prosthodontists.

Interventions

ADLC attachment system with PEEK inserts

Each patient will receive 2 implants in the canine region using a guided-surgery protocol and a pre-prepared surgical stent. A healing abutment of an adequate size will be placed on the implant for transmucosal healing. The flaps will be subsequently sutured around the healing abutments. Patients' existing prostheses will be adjusted. Suture removal will be performed one week post implant placement.

Three months later, implant level impressions will be made using the open tray technique. Each patient will be then be randomized using eCRF (electronic Case Report Form) to either ADLC group or LOC group. A final cast of the patients will be obtained and the attachments will be installed using an in-direct technique by a calibrated prosthodontists.

Intervention Type: DEVICE

Other Intervention Names

NOVALOC

Eligibility Criteria

Inclusion Criteria

• Fully edentulous patients encountering problems (functional, aesthetics) with existing dentures in the upper and lower jaw or patients seeking for implant-supported prostheses
• Adequate bone in the anterior mandible for the placement of implants (Regular diameter implant with a minimal length of 10mm) in the canine region
• Written informed consent
• Ability to understand the procedure and to answer a questionnaire.

Exclusion Criteria

• Impaired cognitive function and/or manual dexterity
• Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, etc. of the participant
• Unable to attend follow-up examinations
• Known or suspected non-compliance, drug or alcohol abuse
• Presence of any uncontrolled systematic disease that could compromise implant surgery and implant long-term performance
• History of radiotherapy in the head and neck region
• Heavy smoker (>10 cig. /day
• Any potential allergies or hypersensitivity to chemical ingredients of material used

• Bruxism
• Presence of bone metabolic disorders (e.g. osteoporosis)
• Pregnant or lactating women

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

University of Zurich

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Mohit Kheur, Prof.

Role: PRINCIPAL_INVESTIGATOR

M.A.Rangoonwala College of Dental Sciences & Research Center

Locations

M.A.Rangoonwala College of Dental Sciences & Research Center

Pune, , India

Countries

India

Other Identifiers

MCES/EC/613/2020

Identifier Type: -

Identifier Source: org_study_id