Associations of facial profile and occlusion in the Northern Finland Birth Cohort 1966
Since the very early years of the profession, orthodontists have been interested in evaluating the effect of orthodontics on facial appearance and determine the appropriate treatment approach for each patient. However, the current literature mostly examines growing individuals and young adults becau...
| Main Authors: | , |
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| Format: | Doctoral or Postdoctoral Thesis |
| Language: | English |
| Published: |
Institutes outside Greece
2022
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10442/hedi/55702 https://doi.org/10.12681/eadd/55702 |
| Summary: | Since the very early years of the profession, orthodontists have been interested in evaluating the effect of orthodontics on facial appearance and determine the appropriate treatment approach for each patient. However, the current literature mostly examines growing individuals and young adults because, traditionally, they constitute the majority of orthodontic patients. Nevertheless, this paradigm has now changed, with older adults also seeking orthodontic care in order to improve the esthetics and proper function of their occlusion. Within this spectrum, this work studied a large middle-aged adult population (N=1964) to determine the characteristics of their facial profile and make associations to underlying occlusal relationships. The study population comprised individuals who are all members of the NFBC1966 and had returned for a follow up examination visit in 2012, on their 46th birth year. On the day of their follow up visit, a comprehensive clinical examination was performed, and diagnostic records were taken, including extraoral photographs. For the purpose of this investigation, the occlusal measurements and profile photographs were collected and analyzed. The association between overjet, overbite and facial profile were assessed with traditional soft tissue measurements on profile photographs. In addition, geometric morphometric analyses were used to explore the variability of facial profile in this middle-aged population. Finally, the previously applied geometric morphometric methods were also used to regress facial profile shape on overjet and overbite. The results showed that overjet and overbite were more related to measurements describing the sagittal position of the upper and lower lips. This was more evident in severe malocclusions. Profile shape variation was related mainly to the protuberance of the lips, the projection of the nose and chin prominence. The shape of the upper lip was mainly associated to overjet, while overbite was mostly associated to the lower lip and the mentolabial ... |
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