Table 1: Patient characteristics and details of the study recruitment.

Test Control
Number (male/female) 86 (48/38) 86 (51/35)
Average age (range) 15.6 (15.0 – 16.7) 15.5 (14.7 – 16.7)
Orthodontic treatment yes no
Bitewing radiographs Analog,
Kodak Insight films,
Speed F
Digital,
Dürr image plates 2+ & Dürr VistaScan Perio Plus image plate scanner
Period 2002 – 2010,
(day of debonding)
2009 – 2014
(routine examinations)
Origin of radiographs University Private Practice
Anonymization yes yes
Percentage of sites
not identified
3.0% 1.3%

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