Microbial Evaluation of MK1 and Clip Attachments in Implant Overdentures

Mansoura University7 enrolled

Overview

This crossover clinical trial aims to compare the microbial colonization associated with double-structure bar implant-supported mandibular overdentures retained by either MK1 or conventional clip attachments. Seven completely edentulous patients will receive both attachment systems sequentially, allowing each participant to serve as their own control. Microbial samples will be collected from the intaglio surface of the prosthesis and peri-implant areas at different follow-up intervals to assess the prevalence of oral microorganisms. The findings will help determine whether the type of attachment influences microbial accumulation and may contribute to improved maintenance and long-term success of implant-supported overdentures.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

Conditions

Evaluation of Microbial Colonization Around Implants and Overdenture Surfaces Using MK1 and Clip Attachments

Interventions

Eligibility

Sex: ALLMin age: 45 YearsMax age: 65 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Completely edentulous patients aged 45-65 years. * Medically healthy patients with no systemic conditions affecting implant placement or osseointegration. * Healthy maxillary and mandibular residual ridges covered by firm mucosa. * Adequate mandibular bone volume in the interforaminal region to receive four implants (minimum 4 mm diameter and 12 mm length), confirmed by CBCT. * Class I maxillomandibular relationship with sufficient interarch space for implant-supported overdentures. Exclusion Criteria: * Uncontrolled diabetes mellitus, immune disorders, osteoporosis, or other contraindications to implant therapy. * Parafunctional habits such as bruxism or clenching. * Flabby ridges or oral mucosal diseases. * Severe temporomandibular joint disorders. * History of allergy to denture or implant materials. * Previous radiotherapy to the head and neck region.

Outcomes

Primary Outcomes

Microbial Colonization

Quantitative assessment of streptococci and staphylococci species collected from the fitting surface of the prosthesis and peri-implant areas using blood agar culture.

Time frame: Baseline (T0), 3 weeks (T1), 6 weeks (T2), and 9 weeks (T3) after prosthesis delivery.

Secondary Outcomes

Comparison of Microbial Growth Between Attachment Systems

Comparison of bacterial counts associated with double-structure bar overdentures retained by MK1 attachments versus conventional clip attachments.

Time frame: Baseline (T0), 3 weeks (T1), 6 weeks (T2), and 9 weeks (T3).