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Accuracy of Multiple Pour Cast from Various Elastomer Impression Methods.

Satheesh B Haralur1, Majed Saad Toman2, Abdullah Ali Al-Shahrani2

  • 1Department of Prosthodontics, College Of Dentistry, King Khalid University, Abha, Saudi Arabia.

International Journal of Dentistry
|January 19, 2017
PubMed
Summary
This summary is machine-generated.

Accurate dental casts reduce chair time and costs. The two-step putty reline impression technique demonstrated superior dimensional accuracy for dental working cast models compared to other methods.

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Area of Science:

  • Dental materials science
  • Prosthodontics
  • Biomaterials

Background:

  • Accurate dental casts are crucial for reducing clinical time, patient inconvenience, and material costs in prosthodontics.
  • The dimensional stability of dental impressions directly impacts the fit and quality of the final restoration.
  • Evaluating different impression materials and techniques is essential for optimizing clinical outcomes.

Purpose of the Study:

  • To compare the dimensional accuracy of different impression techniques for fabricating accurate duplicate casts.
  • To evaluate the impact of impression material and technique on the dimensional stability of Type IV gypsum casts.
  • To identify the most reliable impression method for clinical application in prosthodontic procedures.

Main Methods:

  • Fabrication of a stainless steel working cast model assembly with two abutments and one pontic.
  • Custom aluminum trays with 5 mm and 2 mm spacers were used for impression taking.
  • Impression methods included two-step putty reline, one-step heavy-light body, one-step monophase, and one-step polyether.
  • Type IV gypsum casts were poured at 1, 12, 24, and 48-hour intervals.
  • Dimensional accuracy of the resultant casts was measured using a traveling microscope and analyzed with Analysis of Variance.

Main Results:

  • The two-step putty reline technique showed minimal dimensional variation: height decreased by -0.36% to -0.97%, and diameter increased by 0.40% to 0.90%.
  • One-step heavy-light body, monophase silicone, and polyether techniques exhibited greater dimensional changes in height (-0.73% to -1.46%) and width (0.50% to 1.20%, -1.30%).
  • The two-step putty reline impression method yielded the most dimensionally stable casts among those evaluated.

Conclusions:

  • The two-step putty reline impression technique is recommended for achieving superior dimensional accuracy in dental cast fabrication.
  • This technique minimizes distortion, ensuring a more precise fit for dental prostheses and reducing the need for adjustments.
  • Choosing the appropriate impression material and technique significantly influences the dimensional stability of working cast models.