Skeletal and dental effects of serial extractions performed with or without maxillary expansion : a retrospective controlled study

Quinzi, Vincenzo (author), Ettore Salvati, Simone (author), Lerda, Fabrizio (author), Compri, Matilde (author), Rosa, Marco (author), Primožič, Jasmina (author)

Objectives: The study aimed to compare severe crowding treatment's skeletal and dental effects by serial extractions or maxillary expansion and serial extractions in the mixed dentition phase. Setting and Sample Population: The retrospective controlled study included lateral cephalograms of 78 subjects aged 8.5 ± 1.4 years, 52 consecutively treated because of severe crowding, and 26 untreated controls matched for baseline age and observational period. Methods: Subjects were clustered according to the treatment modality, either serial extraction (EX) or expansion and extraction (EXP-EX) group. Sagittal and vertical skeletal as well as dental cephalometric parameters were assessed at baseline and after the eruption of all permanent posterior teeth, and group comparisons were performed. Results: Both treatment modalities significantly affected the vertical skeletal parameters in terms of decreasing the mandibular and occlusal plane inclination and increasing the facial height index. A distinct treatment effect on the gonial angle was observed, with a significant decrease in its superior part observed in both extraction groups. The annualized changes in the superior part of the gonial angle significantly differ (P= .036) between the Control (−0.04 ± 0.6), EX (−0.44 ± 0.6) and EXP-EX (−0.34 ± 0.5) groups. Upper and lower incisor inclination did not change significantly in any of the groups; however, the interincisal angle at follow-up was significantly smaller in the Control compared with both treated groups. Conclusions: Serial extractions and a combination of maxillary expansion and serial extractions have similar significant skeletal effects, mainly affecting vertical cephalometric parameters if performed during the pre-pubertal growth phase.

• Language: English
• Keywords: alveolar bone, micro-CT, orthodontic, tooth movement, growth change, maxillary expansion, serial extractions
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: MF - Faculty of Medicine
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: Str. 642-649
• Numbering: Vol. 26, iss. 4
• PID: 20.500.12556/RUL-152305
• UDC: 616.31
• ISSN on article: 1601-6343
• DOI: 10.1111/ocr.12647
• COBISS.SI-ID: 147272195
• Publication date in RUL: 17.11.2023

Record is a part of a journal

• Title: Orthodontics and craniofacial research
• Shortened title: Orthod. craniofac. res.
• Publisher: Wiley
• ISSN: 1601-6343
• COBISS.SI-ID: 517802009

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: alveolarna kost, mikro-CT, ortodontija, premikanje zob

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P3-0374
• Name: Preiskovanje orofacialnega področja za izboljšanje oralnega zdravja