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Breakage incidence with direct-bonded lingual retainers.
K W Lumsden1, G Saidler, J H McColl
1Department of Statistics, University of Glasgow, U.K.
British Journal of Orthodontics
|October 26, 1999
Summary
This study found that upper bonded retainers break more frequently than lower ones. Retainer breakage was not linked to patient age, sex, or the specific adhesive materials used.
Area of Science:
- Orthodontics
- Dental Materials Science
Background:
- Bonded retainers are crucial for maintaining orthodontic treatment outcomes.
- Understanding factors influencing retainer survival is essential for clinical practice.
Purpose of the Study:
- To investigate patient and clinical variables affecting bonded retainer breakage.
- To analyze the survival rates of bonded retainers over a 5-year period.
Main Methods:
- Retrospective review of 200 bonded retainers from two clinical centers.
- Kaplan-Meier survival graphs, Log Rank Tests, and Cox Proportional Hazard Model were employed.
- Analysis included adhesive type, patient sex, arch (upper/lower), and age.
Main Results:
- Upper retainers exhibited higher breakage rates (38.8% upper with Relyabond, 75% upper with Helioprogress) compared to lower retainers (22.1% lower with Relyabond, 23.2% lower with Helioprogress).
- Breakage was not significantly associated with adhesive material, patient age, or sex.
- Early breakage within 6 months was more common at the adhesive pad (9.6%) than the wire (2.5%).
Conclusions:
- Upper arch bonded retainers have a higher incidence of breakage.
- Clinical factors like patient age and sex, and material type do not appear to significantly influence retainer survival.
- Adhesive pad integrity is critical for early retainer stability.