Research Article
A Radiographic Evaluation of Missing of Permanent First Molars in a Group of Iranian Children and Adults: A Retrospective Study
Table 1
Frequency of first molar missing according to sex and age group.
| | | One missing | Two missing | Three missing | Four missing | No missing | Total |
| | Sex | | | | | | | | Female | 277 (18.3%) | 131 (8.6%) | 89 (5.9%) | 77 (5.1%) | 933 (61.9%) | 1507 (100%) | | Male | 109 (15.5%) | 97 (13.8%) | 70 (10%) | 34 (4.8%) | 389 (55.6%) | 699 (100%) | | Total | 386 (17.4%) | 228 (10.3%) | 159 (7.1%) | 111 (4.9%) | 1322 (59.9%) | 2206 (100%) | | Age | | | | | | | | 7–15 | 29 (23.9%) | 38 (31.4%) | 18 (14.8%) | 1 (0.8%) | 35 (28.9%) | 121 (100%) | | 16–30 | 108 (20.8%) | 13 (2.5%) | 0 (0%) | 0 (0%) | 398 (76.6%) | 519 (100%) | | 31–45 | 115 (19.1%) | 84 (13.9%) | 29 (4.8%) | 2 (0.3%) | 371 (61.7%) | 601 (100%) | | 46–60 | 102 (13.8%) | 50 (6.7%) | 72 (9.7%) | 34 (4.6%) | 479 (64.9%) | 737 (100%) | | >60 | 8 (3.4%) | 32 (14%) | 74 (32.4%) | 74 (32.4%) | 40 (17.5%) | 228 (100%) |
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