Smile esthetics: Evaluation of long-term changes in the transverse dimension
Autor: | Sercan Akyalcin, Jeryl D. English, J. Moody Alexander, Wick G. Alexander, Ronald L Gallerano, Kenner Misner |
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Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Orthodontics
Maxillary arch Esthetics business.industry Significant group Extraction 030206 dentistry Buccal administration Width ratio Mean difference 03 medical and health sciences 0302 clinical medicine medicine.anatomical_structure stomatognathic system Premolar Medicine Original Article 030212 general & internal medicine Transverse dimension business Stability Dental arch width |
Zdroj: | Korean Journal of Orthodontics |
ISSN: | 2005-372X 2234-7518 |
Popis: | Objective To analyze the long-term changes in maxillary arch widths and buccal corridor ratios in orthodontic patients treated with and without premolar extractions. Methods The study included 53 patients who were divided into the extraction (n = 28) and nonextraction (n = 25) groups. These patients had complete orthodontic records from the pretreatment (T1), posttreatment (T2), and postretention (T3) periods. Their mean retention and postretention times were 4 years 2 months and 17 years 8 months, respectively. Dental models and smiling photographs from all three periods were digitized to compare the changes in three dental arch width measurements and three buccal corridor ratios over time between the extraction and nonextraction groups. Data were analyzed using analysis of variance tests. Post-hoc multiple comparisons were made using Bonferroni correction. Results Soft-tissue extension during smiling increased with age in both groups. The maximum dental width to smile width ratio (MDW/SW) also showed a favorable increase with treatment in both groups (p < 0.05), and remained virtually stable at T3 (p > 0.05). According to the MDW/SW ratio, the mean difference in the buccal corridor space of the two groups was 2.4 ± 0.2% at T3. Additionally, no significant group × time interaction was found for any of the buccal corridor ratios studied. Conclusions Premolar extractions did not negatively affect transverse maxillary arch widths and buccal corridor ratios. The long-term outcome of orthodontic treatment was comparable between the study groups. |
Databáze: | OpenAIRE |
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