Effect of several try-in attempts of crimped preformed metal crowns on their circumference

  • A. Heidari
  • M. Shahrabi
  • M. S. ShahrabiEmail author
  • P. Daeeyan
  • M. Meskin
Original Scientific Article



To assess whether several try-in attempts change the circumference of preformed metal crowns (PMCs).


This in vitro, experimental study was performed on 68 PMCs of maxillary and mandibular molars that required crimping. First, a photograph was obtained of the gingival margin of each crown using a digital camera (fixed at a specific distance). Crown margins were then crimped using 114 pliers. The second photograph was obtained under the same conditions as the first one. After crimping, the crowns were removed using an excavator to assess the amount of crimping. This was repeated for the second time and a photograph was obtained after each time of PMC removal. The crown was crimped again and tried on the tooth and a photograph was obtained after completion of each phase. Photographs were saved in a computer and the circumference of the crowns was calculated using AutoCAD software.


The reduction in circumference of the crowns following the first crimping was greater for the primary second molars than for the primary first molars and was on average 0.87%. After trying the crowns on teeth, the circumference of the crowns increased on average by 0.33%. This increase was 0.53% after trying the crowns for the second time. The reduction in circumference after the second crimping was 0.51%. There was an increase in circumference after re-trying of 0.35%. Changes in circumference of the crowns after the first (p = 0.037) and second (p = 0.00) try-in attempts were statistically significant.


Re-crimping is necessary after trying the crown on tooth and prior to cementation.


Preformed Metal Crowns Circumference Thickness Marginal Fit Crimp 



No funding has been received for the conduct of this study and /or preparation of this manuscript.

Compliance with Ethical Standards

Conflict of interest

There is no conflict of interest to declare.

Research involving Human Participants and/or Animals

This Study was approved in the ethic committee of our university (Code: 6166).

Informed consent

Parent signed informed consent forms.


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Copyright information

© European Academy of Paediatric Dentistry 2019

Authors and Affiliations

  • A. Heidari
    • 1
  • M. Shahrabi
    • 1
  • M. S. Shahrabi
    • 1
    Email author
  • P. Daeeyan
    • 2
  • M. Meskin
    • 1
  1. 1.Department of Pediatric DentistryTehran University of Medical SciencesTehranIran
  2. 2.Dentist, Private PracticeTehranIran

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