Effects of Impacted Third Molars Extraction on Periodontal Status of Second Molar and Oral Health-Related Quality of Life
Table 1. Features of the studypopulation, n (%)
| Features | Treatment group(N=136) | Control group(N=136) |
| Gender |
|
|
| Male | 133(97.79) | 133(97.79) |
| Female | 3(2.21) | 3(2.21) |
| Age (yr) |
|
|
| ≦20 | 36(26.47) | 38(27.94) |
| 21-30 | 71(52.21) | 69(50.74) |
| 31-40 | 25 (18.38) | 23(16.91) |
| 41 | 4 (2.94) | 6(4.41) |
| Race |
|
|
| Han nationality | 136(100) | 136(100) |
| Educational level |
|
|
| Primary school | 16(11.76) | 16(11.76) |
| 41(30.15) | 39(28.68) | |
| Bachelor degree or higher level | 79(58.09) | 81(59.56) |
| Oral hygiene |
|
|
| Good | 31 (22.79) | 29(21.32) |
| Bad | 105 (77.21) | 107(78.68) |
|
|
| |
| Yes | 76 (55.88) | 77(56.62) |
| No | 60 (44.12) | 59(43.38) |
| Regular dental check |
|
|
| Yes | 20 (14.71) | 19(13.97) |
| No | 116 (85.29) | 117(86.03) |
|
|
| |
| Yes | 86(63.24) | 83(61.03) |
| No | 50(36.76) | 53(38.97) |
| Seeking M3 surgery due to toothache |
|
|
| Yes | 117 (86.03) | 115(84.56) |
| No | 19 (13.97) | 21(15.44) |
| Impact M3 type |
|
|
| Soft tissue | 111(81.62) | 107(78.68) |
| Hard tissue | 25(18.38) | 29(21.32) |
| Obvious infection after M3 removal |
|
|
| Soft tissue | 6(5.41) | (-) |
| Hard tissue | 4(16.00) | (-) |