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Pooling of dentin microtensile bond strength data improves clinical correlation
Siegward D Heintze1, Valentin Rousson
1Research and Development, Ivoclar Vivadent, Preclinical Research, FL-9494 Schaan, Liechtenstein. siegward.heintze@ivoclarvivadent.com
The Journal of Adhesive Dentistry
|May 20, 2011
Summary
Macrotensile and microtensile bond strength tests correlate well with two-year clinical retention rates for cervical restorations. Multicenter data is crucial for reliable assessment of dental adhesive systems.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Clinical Research Methodology
Background:
- In vitro bond strength tests are used to predict the clinical performance of dental restorative materials.
- The reliability of these in vitro tests in predicting clinical retention rates, particularly for cervical restorations, requires further investigation.
- Evaluating the influence of data aggregation methods (pooled vs. single-test) on the correlation between laboratory findings and clinical outcomes is essential.
Purpose of the Study:
- To determine if the correlation between in vitro bond strength data and estimated two-year clinical retention rates of cervical restorations is influenced by using pooled multicenter data versus single-test data.
- To assess the predictive value of different in vitro bond strength testing methods for clinical success.
Main Methods:
- Pooled mean data from six dentin adhesive systems across four laboratory methods (macroshear, microshear, macrotensile, microtensile) were correlated with pooled two-year clinical retention rates.
- Data from single-test institutes were also analyzed for comparison.
- A meta-analysis database and linear mixed models were employed to adjust for study effects, dentin preparation, isolation, and enamel bevelling.
Main Results:
- Pooled data analysis showed that macrotensile (adjusted R2 = 0.86) and microtensile bond strength tests (adjusted R2 = 0.64) correlated well with clinical retention rates.
- Shear and microshear bond strength tests did not show a significant correlation.
- Correlation was not statistically significant when using data from a single-test institute.
Conclusions:
- Macrotensile and microtensile bond strength tests demonstrate adequate correlation with the two-year retention rates of cervical restorations.
- To ensure reliability and assess technique sensitivity, bond strength tests should ideally be conducted by multiple operators and/or research institutes.
