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Niger J Clin Pract. 2017 Dec;20(12):1610-1617. doi: 10.4103/1119-3077.196083.

Evaluation of vertical marginal adaptation of provisional crowns by digital microscope.

Author information

1
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Kingdom of Saudi Arabia.

Abstract

OBJECTIVE:

To investigate and compare the degree of vertical marginal discrepancy of four provisional crown materials by digital microscope.

MATERIALS AND METHODS:

A total of 100 provisional crowns were fabricated on standardized resin dies by direct technique of provisional fabrication, using four different provisional materials (n = 25): Provisionals Fabricated by Systemp® c and b II, ivoclar vivadent, Schaan, Liechtenstein (group A); ProtempTM Plus, 3M ESPE, Neuss, Germany (group B); Success CD, PROMEDICA, Neumunster, Germany (group C); and Trim® Plus, Bosworth Company, Illinois, USA (group D). The provisional crowns were finished, tried, and locked with a customized device under 15N of vertical axial force. The vertical marginal discrepancy between the crown margin and the resin die was measured in micrometers using digital microscope (KH-7700, Hirox-USA, Inc., NJ, USA) at mid of buccal, lingual, mesial, and distal margin areas by a trained technician.

RESULTS:

The mean values obtained for each group were as follows: group A = 129.10 ± 41.64, group B = 123.36 ± 40.94, group C = 89.67 ± 25.34, and group D = 107.24 ± 38.32. Assessment by post hoc Tukey's test at 5% significance level showed a statistically significant difference (P < 0.05) between group C and group D with the other groups. Results of one-way ANOVA showed a statistically nonsignificant difference (P > 0.05) between the means of the four areas of measurement for each group.

CONCLUSION:

Marginal discrepancy of the group C (Success CD) was the lowest among the provisionals tested. The mean vertical marginal gap values for the materials tested were found to be with in the clinically acceptable range (<130 μm).

PMID:
29378995
DOI:
10.4103/1119-3077.196083
[Indexed for MEDLINE]
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