Evaluation of Occlusal Adjustment Material Removal on Monolithic Zirconia Blocks: An In Vitro Study
Trial statusNot yet recruiting
Trial phaseNot listed
Trial typeObservational
Biological sexAll
Age20-40
SponsorNational Taiwan University Hospital
About this trial
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.
Eligibility criteria
Qualifiers
None
Disqualifiers
Acute upper-limb/hand injuries or postoperative recovery within the past 3 months that may affect grip strength or fine motor control.
Neuromuscular disorders or tremor/postural control impairments (e.g., essential tremor, peripheral neuropathy, moderate to severe carpal tunnel syndrome) that prevent stable operation.
Uncorrected or inadequately corrected vision that does not meet the requirements for close-range tasks (e.g., inability to clearly see fine markings at a distance of 30-40 cm even with correction).
Inability to follow the metronome rhythm (100 beats per minute).
Trial design
Treatments tested in this trial
- perform material removal on monolithic zirconia
Treatment groups
120 Participants
are divided into 3 treatment groupsLocations
Sponsors and collaborators
Source ClinicalTrials.gov