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A new method of measuring dimensional change.

E L DaBreo1, P Herman

  • 1Section of Restorative and Prosthetic Dentistry, Ohio State University, College of Dentistry, Columbus.

The Journal of Prosthetic Dentistry
|May 1, 1991
PubMed
Summary

This study introduces a new way to measure how much denture base resins change in size. The method uses small chrome steel balls placed in a stone mold to track distances with high accuracy. The researchers tested the precision of this approach and found it could detect changes as small as 0.002 mm. They also used the method to compare three types of resins after processing and storing them in water. The results showed that each resin type changed differently, and the new method was reliable enough to detect these differences. The authors suggest this method could be useful in dentistry for making more accurate dentures.

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Area of Science:

  • Denture materials research in prosthetic dentistry
  • Measurement precision in dental engineering

Background:

Prior research has established standard methods for evaluating dimensional stability of dental resins, but gaps remain in precision and reproducibility. It was already known that denture base resins undergo dimensional changes during processing and storage. However, no prior work had resolved the exact reproducibility of linear measurements in these materials. Traditional methods often lack sufficient accuracy for small-scale changes. This gap motivated the development of a new measurement approach. The need for precise assessment of resin behavior is critical in clinical settings. No prior work had tested chrome steel ball bearings for this purpose. This paper's contribution is a novel approach to measuring linear dimensional changes with high precision.

Purpose Of The Study:

The aim of this study was to introduce a new method for measuring linear dimensional changes in denture base resins. The specific problem addressed is the lack of precision in current measurement techniques. The motivation stems from the clinical importance of accurate dimensional stability in denture fabrication. This method uses chrome steel ball bearings to record measurements. The study sought to evaluate the precision of this new approach. It also aimed to compare dimensional changes across three resin types. The study focused on light-cured, heat-cured, and self-cured resins. The goal was to determine if the new method could detect differences between these materials.

Keywords:
Denture base resinDimensional change measurementChrome steel ball bearingsDental materials testing

Frequently Asked Questions

The method can detect dimensional changes in denture resins with an accuracy of 0.002 mm.

Measurements were taken by reflecting light from the surface of 1.57 mm diameter chrome steel balls.

The stone mold provided a stable baseline for testing the method's precision before applying it to resins.

Specimens were stored in distilled water at 37°C for 7 days to simulate clinical conditions and observe resin behavior.

An analysis of variance (ANOVA) was performed to compare dimensional changes among the three resin types.

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Main Methods:

Chrome steel ball bearings with a diameter of 1.57 mm were embedded in a stone mold. Reflection from the ball surfaces was used to measure distances between two points. Repeated measurements were conducted to assess precision. The method was tested on a stone mold to establish baseline accuracy. Random measurements were taken with an accuracy of 0.002 mm. The same method was then applied to denture base resins. Three resin types were tested: light-cured, heat-cured, and self-cured. After processing, specimens were stored in distilled water at 37 degrees C for 7 days.

Main Results:

The new method demonstrated high precision in measuring linear dimensional changes. Repeated measurements showed an accuracy of 0.002 mm in the stone mold. The method successfully detected differences among the three resin types. Light-cured resins showed distinct dimensional changes compared to others. Heat-cured resins exhibited a different pattern of change after processing. Self-cured resins also showed unique dimensional behavior. Statistical analysis confirmed significant differences between the resins. These findings support the reliability of the new measurement method.

Conclusions:

The authors propose that this new method is accurate and reproducible for measuring dimensional changes. The findings suggest that the method can detect subtle differences in resin behavior. The study supports the use of chrome steel ball bearings for high-precision measurements. The results indicate that the three resin types behave differently after processing. The method's precision was confirmed through repeated measurements. The study does not claim that this is the only accurate method available. The authors emphasize the importance of precise measurement in denture fabrication. The method's reproducibility was validated through statistical analysis.

The authors concluded that the method is reproducible and suitable for measuring dimensional changes in denture resins.