Supplementary Implants Supporting Conventional Removable Dental Prosthesis (RDPs) in Kennedy Class I

Supplementary Implants Supporting Conventional RDPs in Kennedy Class I: A Dual-centered Randomized Controlled Trial

In this study the additional effect of supplementary implants in patients with Kennedy Class I in terms of patient-reported outcome measures (PROMs) and cost-benefit-analyses comparing costs of maintenance care will be investigated

Study Overview

• Status: Recruiting
• Conditions: Partial Edentulism Kennedy Class 1
• Intervention / Treatment: Device: dental implants and retentive implant components; Device: dental implants and supportive implant components

• Study Type: Interventional
• Enrollment (Estimated): 20
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Nicola Zitzmann, Prof. Dr.; Phone Number: +41 61 267 26 31; Email: n.zitzmann@unibas.ch
• Study Contact Backup: Name: Tim Joda, Prof. Dr.; Phone Number: +41 61 267 26 31; Email: tim.joda@unibas.ch

Study Locations

• Switzerland
  • Basel, Switzerland, 4058
    • Recruiting
    • Department of Reconstructive Dentistry, University Center for Dental Medicine Basel UZB, University of Basel
    • Contact: Nicola Zitzmann, Prof. Dr.; Phone Number: +41 61 267 26 31; Email: n.zitzmann@unibas.ch
    • Contact: Tim Joda, Prof. Dr.; Phone Number: +41 61 267 26 31; Email: tim.joda@unibas.ch

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Subjects must have voluntarily signed the informed consent before any study action, are willing and able to attend scheduled follow-up visits, and agree that the encoded data will be collected and analyzed
• Males and females with at least 18 years of age
• intraoral situation with bilateral edentulous areas located posterior to the remaining natural teeth (Kennedy class I) in the upper or lower jaw
• remaining dentition includes a first premolar, canine or incisor as the most posterior tooth

Exclusion Criteria:

• Uncontrolled systemic disease that would interfere with dental implant therapy;
• Patients who smoke > 10 cigarettes per day or tobacco equivalents;
• Patients with alcohol and/or drug abuse;
• Patients with chronic pain;
• Patients with untreated periodontitis and / or inadequate oral hygiene (Plaque Index < 30%);
• Medical conditions requiring chronic high dose steroid therapy or anti-resorptive treatment;
• Conditions or circumstances, in the opinion of the investigators, which would prevent completion of study participation or interfere with analysis of study results such as history of non-compliance or unreliability.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Supportive Care
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Experimental; All included participants receive each side 1 posterior implant in the edentulous areas bilaterally in Kennedy class I. Participants are provided with a conventional clasp retained removable partial denture (RPD) worn for 3 months. When implant osseointegration is ensured (3 months healing period), patients are assigned to retentive components (Group A, Test) which are connected to the implants to retain the RPD	Device: dental implants and retentive implant components; retentive components (Group A Test), which are connected to the implants to retain the RPD
Experimental: Control; All included participants receive each side 1 posterior implant in the edentulous areas bilaterally in Kennedy class I. Participants are provided with a conventional clasp retained removable partial denture (RPD) worn for 3 months. When implant osseointegration is ensured (3 months healing period), patients are assigned to supportive components (Group B, Control), which are connected to the implants to support the RPD	Device: dental implants and supportive implant components; supportive components (Group B Control), which are connected to the implants to support the RPD

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Changes in patient-reported outcome measures (PROM)	Assessment of patient's perception of function and oral health comparing conventional RPDs to implant-supported RPDs with and without retentive components in posterior sites of Kennedy Class I. PROMs are evaluated using the Oral Health Impact Profile (OHIP 14), i.e. the short form of OHIP with 14 items measuring oral health-related quality of life (OHQoL). The frequency of impairment in different areas (functional limitation, physical discomfort or disability, psychological discomfort or disability, social disability, and handicap) are indicated on a multi-level scale ("never"=0, "hardly"=1, "sometimes"=2, "often"=3, "very often"=4)	assessment before implant placement, -1 week and 3 months after RPD insertion, 1 week and 3 months after connecting the implant components, 1 to 5 years after implant placement (5-year study period)
Changes in chewing efficiency	Assessment of the chewing Efficiency by masticating standardized fruit gum with three varying degree of hardness. A complete chewing function test comprises 9 chewing sequences: the different hardness of the model food is chewed once on the right, then on the left and finally on both sides. The study participants have 30 seconds for each chewing sequence and 30 seconds between each chewing sequence. Only one fruit gum is chewed per chewing sequence. The samples are placed on a defined area, photographed in standardized manner and analyzed with a computer program. The mean size and amounts of the chewed particles are calculated and determines the chewing efficiency	assessment before implant placement, -1 week and 3 months after RPD insertion, 1 week and 3 months after connecting the implant components, 1 to 5 years after implant placement (5-year study period)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
prosthetic and implant survival rates	prosthetic and implant survival rates (%) accounting for any technical and biological complication over 5 years	during follow-ups, 1 of 5 years after implant placement
cost-benefit-analyses	cost-benefit-analyses over time, including costs during maintenance care during follow-up of 5 years will be conducted to compare test and control	during follow-ups, 1 of 5 years after implant placement
Evaluation of success of entire treatment	evaluation of success of the entire treatment including assessments of technical (prosthesis adjustment or implant abutment adjustment or exchange) and biological complications (peri-implant diseases)	during follow-ups, 1 of 5 years after implant placement

Collaborators and Investigators

• Sponsor: University Hospital, Basel, Switzerland
• Collaborators: ITI International Team for Implantology, Switzerland

Study record dates

Study Major Dates

• Study Start (Actual): February 6, 2020
• Primary Completion (Estimated): February 1, 2026
• Study Completion (Estimated): February 1, 2026

Study Registration Dates

• First Submitted: February 6, 2020
• First Submitted That Met QC Criteria: February 18, 2020
• First Posted (Actual): February 19, 2020

Study Record Updates

• Last Update Posted (Actual): April 15, 2024
• Last Update Submitted That Met QC Criteria: April 12, 2024
• Last Verified: April 1, 2024

More Information

Terms related to this study

• Keywords: Partial Edentulism; Kennedy Class 1; Removable partial dentures (RPDs); Supplementary implants
• Other Study ID Numbers: 2019-02167; ex19Joda2

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No