Orthodontic Treatment of Anterior Open-bite With and Without Skeletal Anchorage

Introduction: Although there appears to be mounting evidence of benefits that TADs may offer in treatment of anterior open bite (AOB), there remains a lack of studies comparing outcomes and stability in patients treated with and without skeletal anchorage in growing versus non-growing individuals. The purpose of this study is to compare outcomes of AOB treatment with fixed appliances only (non-TADs) to treatment with fixed appliances in conjunction with TADs. Effects of growth and open-bite severity on treatment success and stability are explored. Methods: Pre- (T1) and post-treatment (T2) lateral cephalographs were compared for 68 TAD and 42 non-TAD AOB patients using a custom analysis. T1 and T2 intraoral photographs were also scored using the Photographic Open-bite Severity Index (POSI). One-year retention (T3) photographs were measured for 58 of these patients, also using the POSI scale. Multiple linear and logistic regression models were utilized to explore effects of growth, pre-treatment severity, and location of TAD placement on treatment success and stability. Results: Treatment success rates were similar between TAD (83.8%) and non-TAD (88.1%) AOB patients. Growth during treatment did not demonstrate a significant influence on treatment success (OB > 0). Growing and non-growing patients treated with TADs tended to show greater changes in cephalometric measurements than their non-TAD counterparts, particularly in change in lower face height, anterior face height, and maxillary molar vertical height. Patients with TADs in both arches tended to exhibit even more noticeable skeletal and facial changes, with reduced extrusion of incisors. Stability rates were higher for TAD patients (80.0%) compared to non-TAD patients (57.1%), and higher for non-growers (83.3%) compared to growers (50.0%), though these findings were not statistically significant. Conclusion: The success rates for patients treated orthodontically for anterior open bite in this study were high. The research suggests that beneficial vertical changes can be obtained with the use of skeletal anchorage for molar intrusion in open bite patients, particularly when it is utilized in both upper and lower arches. Open bite patients with growth potential may also benefit from the use of TADs during treatment, as it appears to limit the vertical growth pattern normally expected. Practitioners should be aware of the relapse potential in open bite patients, especially in growing patients.

Author dc:creator

• Johnson, Jason

Advisor dc:contributor.advisor

• Bollen, Anne-Marie

• Anchorage
• Open-bite
• Orthodontic
• Dentistry

Statement dc:rights

• none

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/1773/45479

OAI identifier oai:identifier

oai:digital.lib.washington.edu:1773/45479