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A longitudinal study of incremental expansion using a mandibular lip bumper
C Chris Murphy1, W Bonham Magness, Jeryl D English
1Department of Orthodontics, Dental Branch, University of Texas Health Science Center at Houston, 77030, USA.
The Angle Orthodontist
|August 28, 2003
Summary
Mandibular lip bumper therapy achieves most dental arch expansion early in treatment. About 50% of total expansion occurs within 100 days, suggesting treatment duration can be optimized.
Area of Science:
- Orthodontics
- Dental Arch Development
Background:
- Mandibular lip bumper therapy is used to expand the dental arch in adolescent patients.
- The rate of expansion during this therapy is not well understood.
Purpose of the Study:
- To evaluate the incremental expansion achieved during mandibular lip bumper therapy.
- To determine if expansion occurs evenly over time or attenuates with treatment duration.
Main Methods:
- Retrospective study of 44 adolescent patients treated with mandibular lip bumpers.
- Dental cast measurements of arch width and length were analyzed.
- Treatment duration was divided into time segments for comparison.
Main Results:
- Approximately 50% of total arch expansion occurred within the first 100 days.
- An additional 40% of expansion occurred over the subsequent 200 days.
- Only 10% of total expansion was observed after 300 days of treatment.
Conclusions:
- Mandibular lip bumper therapy shows diminishing returns after 300 days.
- Optimizing treatment duration may be possible, reducing overall treatment time.
- The rate of expansion was independent of concurrent maxillary expansion treatments.