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Surface texture of stone model setting against elastomer impression materials.

T Nanami, S G Ostlund

    Swedish Dental Journal
    |January 1, 1984
    PubMed
    Summary

    This study investigated the causes of surface pits in stone models made from silicone impressions. Researchers found that newly set vinyl silicone generates static electricity, which may affect the stone surface during setting. The high contact angle of elastomers was not confirmed as the cause. The study compared different types of silicone and found that vinyl silicone produces more static charge. The results suggest that static electricity could be a contributing factor to surface defects. The authors recommend further research into the role of static electricity in dental impressions. The findings highlight the importance of material properties in model setting. The study contributes to understanding how impression materials interact with casting processes.

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    Area of Science:

    • Dental materials science
    • Surface chemistry in biomedical engineering

    Background:

    No prior work had resolved the exact cause of surface irregularities in stone models made from elastomer impressions. Prior research has shown that silicone rubber impressions often result in stone models with small pits. These pits range from 0.1 to 1 mm in diameter and can appear densely clustered. Some researchers have proposed that the high contact angle of elastomers might be responsible for these defects. However, this explanation remains unconfirmed. The formation of surface pits is a known issue in dental model fabrication. The problem affects the accuracy of dental restorations and prosthetics. Understanding the root cause is essential for improving material selection and processing. This gap motivated the current investigation into alternative explanations for the surface defects.

    Purpose Of The Study:

    This study aimed to evaluate the role of static electricity in the formation of surface pits on stone models. The researchers proposed to test whether newly set elastomers generate static charges that might influence the casting process. They focused specifically on vinyl silicone, or A-silicone, which is commonly used in dental impressions. The study sought to determine if static electricity could be a contributing factor to the observed surface irregularities. The motivation was to provide a more accurate explanation than the previously suggested high contact angle theory. The researchers wanted to assess the physical interactions between the impression material and the stone. They also aimed to identify whether the type of silicone affects static charge generation. This investigation aimed to clarify the mechanisms behind the formation of surface defects.

    Keywords:
    stone model surfaceelastomer impressionsstatic electricity in dentistryvinyl silicone properties

    Frequently Asked Questions

    The study found that newly set vinyl silicone generates significant static electricity, which may influence surface pits in stone models.

    Vinyl silicone, or A-silicone, is commonly used in dental impressions and was selected for its known properties in model setting.

    Static charge may attract particles or alter the flow of stone material, potentially causing surface irregularities.

    The high contact angle theory was not confirmed as the cause of surface defects in this investigation.

    Related Experiment Videos

    Main Methods:

    The researchers conducted a controlled experiment using newly set vinyl silicone and other elastomers. They measured the static charge generated by these materials after setting. The study involved pouring stone models directly from the impressions. Surface characteristics of the stone were analyzed using visual and microscopic techniques. The researchers compared the results across different types of silicone materials. They also tested the influence of environmental conditions on static electricity generation. The experimental design included replicating standard dental impression and model-setting procedures. The study focused on quantifying the static charge and its potential effects on the stone surface.

    Main Results:

    The study found that newly set vinyl silicone generates a significant amount of static electricity. This static charge was not observed in the same way with other types of elastomers. The researchers did not confirm the high contact angle hypothesis as the cause of surface pits. Instead, they proposed that static electricity might influence the stone surface during setting. The static charge could attract particles or affect the flow of the stone material. The results showed that the static charge levels varied depending on the type of silicone used. Vinyl silicone, or A-silicone, consistently produced higher static charge values. The findings suggest that static electricity may play a role in the formation of surface defects.

    Conclusions:

    The authors concluded that the high contact angle of elastomers may not be the primary cause of surface pits on stone models. They proposed that static electricity generated by newly set vinyl silicone could be a more relevant factor. The study did not establish a definitive causal link between static charge and surface defects. However, the findings suggest a potential relationship that warrants further investigation. The researchers emphasized the need for additional studies on the effects of static electricity in dental impressions. They noted that the type of silicone used influences the level of static charge generated. The results highlight the importance of considering material properties beyond contact angle. The authors called for more research into the interactions between impression materials and casting processes.

    The study compared vinyl silicone (A-silicone) with other types of elastomers to assess static charge generation.

    The authors propose further studies on the effects of static electricity and material interactions in model setting.