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Updated: Jun 16, 2026

Precision of In Vivo Quantitative Tooth Wear Measurement Using Intra-Oral Scans
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Published on: July 12, 2022

The Randomized Shortened Dental Arch study (RaSDA): design and protocol.

Ralph G Luthardt1, Birgit Marré, Achim Heinecke

  • 1Clinic of Prosthetic Dentistry, Ulm University, University Hospital, Department of Dentistry, Ulm, Germany. ralph.luthardt@uniklinik-ulm.de

Trials
|February 23, 2010
PubMed
Summary

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This study compares removable prostheses versus fixed bridges for replacing missing molars. Results will inform optimal prosthetic treatment for edentulous patients, improving oral health outcomes.

Area of Science:

  • Dental Prosthetics
  • Oral Health Research
  • Clinical Trials

Background:

  • Limited evidence exists on long-term outcomes for prosthetic treatment of missing molars.
  • Two main approaches are removable dental prostheses and preserving a shortened dental arch.
  • High costs and treatment duration hinder clinical trials in this area.

Purpose of the Study:

  • To compare the clinical performance and long-term outcomes of two common prosthetic treatments for missing molars.
  • To evaluate the efficacy of removable dental prostheses versus fixed bridges in maintaining oral health.

Main Methods:

  • A 14-center randomized controlled trial involving patients over 35 with all molars missing in one jaw.
  • Group A received removable dental prostheses for molar replacement.

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  • Group B received fixed bridges for anterior and premolar teeth, preserving the shortened dental arch.

    • Main Results:

    • The primary outcome is further tooth loss over a 5-year follow-up period.
    • Secondary outcomes include clinical, technical, and subjective patient-reported variables.
    • A pilot trial informed protocol adjustments for improved practicability.

    Conclusions:

    • The trial design is adapted for complex dental prosthetic treatments.
    • Expected results hold high clinical relevance for oral health.
    • Findings aim to improve daily dental care practices by informing treatment choices.