Summary Aim The aim of this cross-sectional study was to investigate gender-specific associations of different malocclusion traits with oral health-related quality of life (OHRQoL) among Finnish adults. Material and methods The study material comprised 1885 subjects from the Northern Finland Birth Cohort 1966. A clinical oral examination including registration of occlusion was carried out in connection with a 46-year follow-up examination. The 14-item Oral Health Impact Profile (OHIP-14) was used to measure OHRQoL. Subgroups with increased/decreased overjet, deep bite, open bite, lateral crossbite, and scissor bite were selected for further analysis. Subjects with normal occlusion were selected to form the normal occlusion group. Differences between subgroups and the normal occlusion group were evaluated for both genders separately. Education, number of teeth, caries, and orthodontic treatment history were chosen as confounding variables. Multivariate Poisson regression analyses were conducted to assess the effect of independent variables on OHRQoL. Results After adjustments, decreased overjet, open bite, and scissor bite were associated with higher OHIP severity in women (P < 0.01). In men, deep bite was associated with higher OHIP severity (P = 0.007). Different malocclusion traits had associations with some OHIP dimension either in men or women. Orthodontic treatment history had a positive effect on OHRQoL in both genders. Conclusion The associations of malocclusion traits with OHRQoL differed between genders, with women reporting more impacts. Deviations from normal occlusion were generally found to have a negative impact on OHRQoL, but most of the adults with malocclusion seem to adapt to their condition.
Summary Aim The aim of this study was to investigate malocclusion severity and its associations with oral health-related quality of life (OHRQoL) among middle-aged adults. Materials and methods The study material consisted of 1786 subjects from the Northern Finland Birth Cohort 1966 who attended dental and oral examination as part of the 46-year-old follow-up study. Malocclusion severity was assessed using the Dental Health Component (DHC) of the Index of Orthodontic Treatment Need (IOTN) and the Peer Assessment Rating index (PAR) from digital 3D dental models. Participants also answered a questionnaire including the Oral Health Impact Profile (OHIP-14) and a question on their satisfaction with occlusal function. Differences between malocclusion severity groups were evaluated for both genders separately. For adjusted models, multivariate Poisson regression models were conducted. Results In this study population, 31.3% had great or very great orthodontic treatment need according to DHC and the mean PAR total score was 22.05. The most severe malocclusions were associated with OHRQoL, especially the psychosocial and handicap dimensions, and satisfaction with occlusal function. There was a significant difference between genders, men having more severe malocclusion but women reporting more OHRQoL impacts. Conclusion One third of the study population were considered to have severe malocclusion. There was an association between malocclusion severity and OHRQoL in adult population, particularly in women.
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