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Evaluation of Occlusal Adjustment Material Removal on Monolithic Zirconia Blocks: An In Vitro Study

NCT07280130 · Status: NOT_YET_RECRUITING · Type: OBSERVATIONAL · Enrollment: 120

Last updated 2025-12-30

No results posted yet for this study

Summary

This study aims to improve understanding of the amount of tooth-replacement material removed during a single grinding "stroke" performed in the adjustment of a zirconia crown. Zirconia is a highly durable ceramic material commonly used for dental restorations, and accurate adjustment is essential for achieving proper occlusion. However, existing literature does not provide quantitative data regarding material removal per stroke during chairside adjustment, resulting in reliance on individual clinical experience.

In this study, standardized zirconia specimens will be prepared and assigned to three operator groups: dental students, dental interns, and experienced clinicians. Each participant will perform a controlled number of grinding strokes on the specimens using a commonly used dental grinding stone. Specimens will be scanned before and after grinding using a three-dimensional scanner to precisely quantify material removal.

Hypothesis

The hypotheses of this study are:

Each grinding stroke results in a measurable and relatively consistent amount of zirconia material removal.

Experienced clinicians demonstrate more controlled and predictable material removal per stroke compared with students and interns.

Conditions

  • Dental Occlusion
  • Occlusal Wear of Teeth
  • Fixed Dental Prosthesis

Interventions

PROCEDURE

perform material removal on monolithic zirconia

Each participant will perform 100 strokes along an 8-mm path at a rate of 100 strokes per minute, guided by a metronome on the monolithic zirconia

Sponsors & Collaborators

  • National Taiwan University Hospital

    lead OTHER

Principal Investigators

  • Yihao Lan, DDS, MSD · National Taiwan University Hospital

Eligibility

Min Age
20 Years
Max Age
40 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2026-02-01
Primary Completion
2027-06-01
Completion
2027-12-31

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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 NCT07280130 on ClinicalTrials.gov