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Kulkarni MM, Thombare RU. Dimensional Changes of Alginate Dental Impression Materials-An Invitro Study. J Clin Diagn Res. 2015;9(8):ZC98-ZC102doi: 10.7860/JCDR/2015/13627.6407.
Kulkarni, M. M., & Thombare, R. U. (2015). Dimensional Changes of Alginate Dental Impression Materials-An Invitro Study. Journal of clinical and diagnostic research : JCDR, 9(8), ZC98-ZC102. https://doi.org/10.7860/JCDR/2015/13627.6407
Kulkarni, Manisha M, and Thombare, Ram U. "Dimensional Changes of Alginate Dental Impression Materials-An Invitro Study." Journal of clinical and diagnostic research : JCDR vol. 9,8 (2015): ZC98-ZC102. doi: https://doi.org/10.7860/JCDR/2015/13627.6407
Kulkarni MM, Thombare RU. Dimensional Changes of Alginate Dental Impression Materials-An Invitro Study. J Clin Diagn Res. 2015 Aug;9(8):ZC98-ZC102. doi: 10.7860/JCDR/2015/13627.6407. Epub 2015 Aug 01. PMID: 26436059; PMCID: PMC4576653.
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J Clin Diagn Res. 2015 Aug;9(8):ZC98-ZC102. doi: 10.7860/JCDR/2015/13627.6407. Epub 2015 Aug 01.

Dimensional Changes of Alginate Dental Impression Materials-An Invitro Study.

Journal of clinical and diagnostic research : JCDR

Manisha M Kulkarni, Ram U Thombare

Affiliations

  1. Reader, Department of Prosthodontics, Yashwant Rao Chauhan Dental College , Ahmednagar, Maharashtra, India .
  2. Professor & HOD, Department of Prosthodontics, Sharad Pawar Dental College , Wardha. Maharashtra, India .

PMID: 26436059 PMCID: PMC4576653 DOI: 10.7860/JCDR/2015/13627.6407

Abstract

BACKGROUND: Dentists are always looking ahead for more dimensionally stable material for accurate and successful fabrication of prosthesis in this competitive world. Arrival of newer materials and increased material market puts dentists in dilemma for selection of material.

AIM: The study evaluated the effect of variations in time of pour and temperature on dimensional stability of three brands of commercially available alginates.

MATERIALS AND METHODS: Velplast, Marieflex & Zelgan alginate impression materials were evaluated by measuring dimensional accuracy of the master cast. A die was prepared and mounted on the apparatus for the ease of impression making. The prepared casts were categorized into five groups and made up of three brands of alginate impression material with variation in time of pour viz: immediate, 20&40 minutes interval and with varying temperature of 25(0)C, 30(0)C & 40(0)C.

RESULTS: Impressions showed least distortion at varying degrees of temperature for 20 minutes, but the values obtained by storing of alginate impressions for 20 minutes at 30(0)C were found to be nearly accurate than the values obtained by storing of impression at 40(0)C. However, storing showed shrinkage of impressions.

CONCLUSION: Marieflex showed better accuracy in comparison with other two materials. Maintenance of temperature and humidity play key role during storage & transport to prevent distortion. But the study suggests immediate pouring which will minimize the distortion. The manipulation instructions, temperature of mixing water, environment & water powder ratio also plays key role in minimizing the distortion.

Keywords: Accuracy; Cast distortion; Dimensional stability; Marieflex; Velplast; Zelgan

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