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Evaluation of One- and Two-Step Impression Techniques and Vertical Marginal Misfit in Fixed Prothesis Publisher



Radfar S1 ; Alikhasi M2, 3 ; Khorshidi S4 ; Tohidkhah S5 ; Morvaridi Farimani R5 ; Shahabi S2, 6
Authors
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Authors Affiliations
  1. 1. School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Department of Prosthodontics, Dental Branch, Islamic Azad University, Tehran, Iran
  5. 5. Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, United States
  6. 6. Department of Dental Biomaterials, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran

Source: International Journal of Dentistry Published:2023


Abstract

Objectives/Purposes. This study compared one-step and two-step impression techniques. Methods. 12 impressions were made of a resin maxillary model (second premolar and second molar) with two prepared abutment teeth using vinyl polysiloxane (VPS); the margin of the second premolar was 0.5 mm subgingivally; and the margin of the second molar tooth was at the level of the gingiva. Impressions were made using two techniques: one-step and two-step putty/light materials. A three-unit metal framework was fabricated on the master model using the computer-aided design/computer-aided manufacturing (CAD/CAM) technique. The vertical marginal misfit was evaluated in the buccal, lingual, and mesial and distal surfaces of the abutments on the gypsum casts using a light microscope. Data were analyzed using the independent t-test (α < 0.05). Results. The results showed significantly lower vertical marginal misfit in all six areas evaluated around the two abutments in the two-step impression technique compared with the corresponding values in the one-step technique. Conclusion. Vertical marginal misfit in the two-step technique with a preliminary putty impression was significantly lower than in the one-step putty/light-body technique. © 2023 Sina Radfar et al.