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In vitro splint rigidity evaluation--comparison of a dynamic and a static measuring method.
Christine Berthold1, Friedrich Johannes Auer, Sergej Potapov
1Dental Clinic 1 - Operative Dentistry and Periodontology, Friedrich-Alexander-University, Erlangen, Germany. berthold@dent.uni-erlangen.de
Summary
The Periotest and Zwick methods for assessing tooth mobility are reproducible but do not correlate. These methods offer distinct insights into periodontal ligament damping and quantitative metric displacement, respectively.
Area of Science:
- Dental research
- Biomechanics
- Periodontology
Background:
- Assessing tooth mobility is crucial for diagnosing periodontal conditions.
- Current methods vary in their ability to provide reproducible and correlated measurements.
Purpose of the Study:
- To evaluate the reproducibility and correlation between the Periotest method and the Zwick universal testing machine for dynamic and static tooth mobility assessment.
- To determine if Periotest values can be converted into metric displacement data.
Main Methods:
- An in vitro study utilized a custom artificial model with simulated 'injured' and 'uninjured' teeth.
- Tooth mobility was measured using the Periotest method and the Zwick universal testing machine in vertical and horizontal dimensions.
- Reproducibility was assessed using ANOVA and Bonferroni tests, while correlation was analyzed with Spearman's rank correlation.
Main Results:
- Both Periotest and vertical Zwick measurements demonstrated high reproducibility.
- No significant correlation was found between the Periotest and Zwick methods.
- Horizontal Zwick measurements showed some differences between initial and subsequent readings.
Conclusions:
- The Periotest and vertical Zwick methods are highly reproducible for tooth mobility assessment.
- The lack of correlation indicates that Periotest values cannot be directly converted to metric displacement.
- Each method provides unique information: Periotest reflects periodontal ligament damping, while Zwick quantifies metric displacement.
