Clinical Comparison of Polyvinyl Siloxane Impression for Fixed Partial Dentures using three Different Techniques

Journal Title: Journal of Advanced Medical and Dental Sciences Research - Year 2017, Vol 5, Issue 11

Abstract

Aim: To compare the defects present in impressions between three different techniques using hand mixing elastomers. Materials and methods: Three master impressions were made from each 64 crown preparations with three different techniques totalling to 168 master impressions. PVS impression material, putty (Aquasil ) and light-body (Reprosil) viscosity combinations were used for every patient with the three techniques i) single stage double mix technique ii) two stage technique with using a spacer and iii) two stage technique without using a spacer. The impressions were rated by two evaluators using Heine binocular magnifying loupe (2.3×) and the results tabulated. The results were presented as percentages. Kappa test was done to compare the obtained results. Results: Out of three techniques the least number of defects were shown by the single stage double mix technique with useable impressions of 96.42%and the two stage technique with using a spacer being the least favorable with usable impression of 86.25%. The two stage technique without using a spacer also had a result of 82.60%. Kappa test was used to compare the individual results. Between technique 1 and 2, there was fair significant agreement between the two methods (p<0.001). But when comparing between techniques 1 and 3 (p= 0.5) and techniques 2 and 3 (p= 0.881), there was insignificant weak agreement signifying that technique 2 impressions were not comparable with technique 1 and 3. Among the defects there was presence of 58 void (60.5%), 26 bubbles (27%) and 12 pulls (12.5%) and absence of any tears. The number of defects located at the margins were 68% and 32% were located at others areas beside the margins. All the pulls were present at the lingual/ palatal aspect of margins while 78% and 56% if voids and bubbles were present at the margins respectively. Conclusion: The single stage double mix technique and two stage technique without using a spacer had a more favorable outcome in comparison to the two stage technique using a spacer using hand mixing technique

Authors and Affiliations

Syed Yasir Qadiri, Shabeena Mustafa

Keywords

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  • EP ID EP559094
  • DOI -
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How To Cite

Syed Yasir Qadiri, Shabeena Mustafa (2017). Clinical Comparison of Polyvinyl Siloxane Impression for Fixed Partial Dentures using three Different Techniques. Journal of Advanced Medical and Dental Sciences Research, 5(11), 29-32. https://europub.co.uk/articles/-A-559094