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Digital VS Conventional Altered Cast Technique for Mandibular Bilateral Distal Extension RPDs

NCT07583966 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 7

Last updated 2026-05-13

No results posted yet for this study

Summary

This study aims to compare outcomes of digitally created altered casts with conventional altered casts in mandibular bilateral distal-extension cases.

Conditions

  • Dentures
  • Mandibular Dimensions
  • Digital

Interventions

PROCEDURE

Digital workflow and Digital altered cast

The RPD design features of fully digitally fabricated RPD illustrated in Figure 2A. Digital selective tissue placement was performed within the same Exocad design project using the free-form scan-data tool, paint and pull feature to apply the principles of selective tissue pressure technique . Using free form mesh editing tools, the buccal shelf area opposing teeth 37 and 47 was identified, and controlled tissue ward displacement of the mucosal surface was simulated while monitoring the magnitude of displacement on sectional views and with digital measurement tools.

PROCEDURE

Conventional Altered Cast Technique

For the CA cast technique, one of the SLM frameworks (MF2) was adapted on the stone master cast and used as a functional impression tray (Acrostone Dental Manufacturing, Cairo, Egypt) over the distal extension areas. A selec-tive pressure impression was made according to the traditional altered cast protocol, with the distal saddle areas repoured in dental stone to obtain the CA cast. This CA was then digitized using a desktop scanner (Dove Technologies, Suzhou, China) to produce the CA cast STL. Wax rims were used to verify the jaw relationship, and the maxillary cast was mounted using a facebow transfer on a semi adjustable articulator (A7 Plus, Bio-Art Equi-pamentos Odontológicos Ltda., São Carlos, SP, Brazil), while the mandibular cast was mounted in maximum intercuspation. Semi anatomic acrylic teeth (Acrostone Dental Manufacturing, Cairo, Egypt.) were arranged, and wax try ins were evaluated intraorally in a conventional manner prior to processing.

Sponsors & Collaborators

  • Tanta University

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
40 Years
Max Age
60 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2021-05-30
Primary Completion
2024-11-30
Completion
2024-11-30

Countries

  • Egypt

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07583966 on ClinicalTrials.gov