Comparison of Three Final Impression Techniques for Severely Resorbed Mandibular Ridges

NCT07764640 | Completed

• 1 other identifier: #R-PR-12-24-3160
• Study Type: interventional
• Target: 8
• Locations: 1 country
• Sites: 1

Brief Summary

This in vivo crossover study aims to compare the accuracy of three different final impression techniques for severely resorbed mandibular ridges in completely edentulous patients. The accuracy of the impressions will be evaluated digitally using three-dimensional scanning and deviation analysis to determine differences among the impression techniques.

Conditions

Severely Resorbed Mandibular Ridge in Completely Edentulous Patients

Keywords

Resorbed ridge,digital analysis,final impression,geomagic

Outcome Measures

Primary Outcomes (1)

• 3D deviation (RMS) between final impression scans

  The accuracy of the final impression techniques was assessed by three-dimensional deviation analysis of the impression scans using Geomagic Control software. Root Mean Square (RMS) deviation was calculated by comparing the scans obtained using the different impression techniques.

  Immediately after each final impression was recorded

Study Arms (3)

Convensional final impression

EXPERIMENTAL

Conventional final impression technique using alginate impression material followed by zinc oxide eugenol (ZOE) impression material.

Procedure: Conventional final impression

Wax impression technique

EXPERIMENTAL

Wax impression technique using a wax impression followed by alginate impression material.

Procedure: Wax impression technique

compound impression technique

EXPERIMENTAL

Wash compound impression technique using a low-fusing impression compound wash followed by alginate impression material.

Procedure: Compound impression technique

Interventions

Conventional final impression PROCEDURE

Conventional final impression technique using alginate impression material followed by zinc oxide eugenol (ZOE) impression material

Convensional final impression

Wax impression technique PROCEDURE

Wax impression technique using a wax impression followed by alginate impression material.

Wax impression technique

Compound impression technique PROCEDURE

Compound impression technique using a low fusing impression compound followed by alginate impression material.

compound impression technique

Eligibility Criteria

• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may not qualify if:

• Completely edentulous patients with severely resorbed mandibular ridges.
• Patients requiring a mandibular complete denture.
• Patients able to tolerate the impression procedures and attend the required study visits.
• Patients willing to participate in the study and provide informed consent.
• Patients with systemic or local conditions that contraindicate conventional dental impression procedures.
• Patients with pathological lesions or significant abnormalities affecting the mandibular denture-bearing area.
• Patients unable to tolerate or cooperate with the impression procedures.
• Patients who decline to participate or withdraw their informed consent. -

Sponsors & Collaborators

• Tanta University: lead

Study Sites (1)

Faculty of Dentistry, Tanta University

Tanta, Gharbia Governorate, Egypt

Location

Study Officials

• Nashwa Ali Saleh, PHD

  Tanta University

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NON RANDOMIZED
• Masking: NONE
• Purpose: OTHER
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Lecturer of Prosthodontics

Study Record Dates

• First Submitted: August 10, 2026
• First Posted: August 14, 2026
• Study Start: December 12, 2024
• Primary Completion: May 23, 2025
• Study Completion: June 14, 2026
• Last Updated: August 14, 2026

Record last verified: 2026-08

Data Sharing

• IPD Sharing: Will not share

Locations

EG (1)