Crestal Bone Response to Narrow vs. Regular Tie-Base in Subcrestal Implants

Not Applicable

Not yet recruiting

• Conditions: Bone Loss

• Registration Number: NCT07196228
• Lead Sponsor: Menoufia University

Brief Summary

This 24-month randomized clinical trial evaluates peri-implant marginal bone changes at subcrestal implants restored with narrow versus regular tie-base abutments.

The study investigates whether narrow or regular tie-base abutments influence peri-implant crestal bone remodeling over 24 months.

This trial assesses the effect of abutment diameter (narrow vs. regular tie-base) on marginal bone stability at subcrestal implants after 24 months.

We aimed to determine if abutment diameter impacts peri-implant marginal bone levels by comparing narrow and regular tie-base abutments in a 24-month RCT.

Detailed Description

INTRODUCTION The preservation of supracrestal peri- implant soft tissues plays a crucial role in maintaining bone tissue stability.(1) In recent decades, it has been suggested that peri- implant marginal bone loss is influenced by several factors, including the surface characteristics of the implant neck, the implant- abutment, abutment height, platform switching, and abutment dis/reconnection.(2) Limiting these disconnections has been shown to improve the maintenance of the peri- implant marginal bone level.

On the other hand, it has been observed that transmucosal abutments with convex designs can influence bone remodeling, even with platform switching, when compared to straight or concave abutments.(3,4) The hypothesis was that distancing the abutment- prosthesis interface from the implant shoulder and using narrower transmucosal abutments with platform switching could favor the maintenance of the peri- implant marginal bone level by reducing bone remodeling and the apical migration of the "biological width".

Although there is evidence regarding the influence of platform switching or abutment height on the maintenance of the peri- implant marginal bone level, the evidence on the effect of abutment diameter is limited.(5,6) Therefore, the aim of this 24- month randomized clinical trial is to evaluate changes in the peri- implant marginal bone level at implants restored narrow or regular tie-base after 24 months.

Study Timeline

• Status Verified: 2025-01
• Study First Submitted: 2025-09-19
• Study First Submitted QC: 2025-09-19
• Last Update Submitted: 2025-09-19
• Study First Posted: 2025-09-29
• Last Update Posted: 2025-09-29
• Study Start: 2025-09-30
• Primary Completion: 2028-09-01
• Study Completion: 2028-12-01

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Crestal bone level changes around subcrestal implants	24 months after loading	Radiographic assessment of peri-implant marginal bone level changes (in millimeters) comparing narrow versus regular tie-base abutments. Measurements are taken from standardized periapical radiographs at the mesial and distal aspects of each implant, using the implant shoulder as reference.