Buccal Alveolar Bone changes and upper first molar displacement after maxillary expansion with RME, Ni-Ti leaf springs expander and Tooth- Bone-borne Expander. A CBCT based analysis

Authors

  • M Maschio Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy - Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan
  • F Gaffuri Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy - Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan
  • A Ugolini Department of Sciences Integrated Surgical and Diagnostic, University of Genova, Genova
  • V Lanteri Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy - Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan
  • A Abate Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy - Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan
  • A Caprioglio Department of Biomedical Surgical and Dental Sciences, University of Milan, Milan, Italy - Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milan

DOI:

https://doi.org/10.23804/ejpd.2023.1896

Keywords:

Malocclusion, Maxillary hypoplasia, Leaf expander, Bone borne maxillary expander, RME, CBCT

Abstract

AIM: To evaluate the buccal alveolar bone changes and the upper first molar displacement in subjects treated with conventional rapid maxillary expansion (RME), Ni-Ti leaf springs expander (Leaf Expander) and Tooth-Bone-borne Expander (Hybrid Expander) using CBCT scans. METHODS: The sample consisted of 52 children treated with RME (n=18), Leaf Expander (n= 17) and Hybrid Expander (n= 17). CBCTs were taken before and after maxillary expansion and the Horos software was used for the analysis. Descriptive statistics and paired t-test were used to assess changes between the pre-treatment and post-treatment measurements. ANOVA test and Tukey's post hoc test with Bonferroni correction was used for between groups comparison. CONCLUSION: The Hybrid Expander during preadolescence showed few advantages over the use of tooth-anchored expanders. An expansion approach with mini-screws is not preferable during early mixed dentition to a conventional approach. The differences in dental tipping values were clinically insignificant and the reduction in cortical bone thickness remained less than 1 mm. When possible, the use of second primary molars as anchorage should be preferred.