alexa A longitudinal study of incremental expansion using a mandibular lip bumper.
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): Murphy CC, Magness WB, English JD, FrazierBowers SA, Salas AM

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Abstract A retrospective study using models was performed to evaluate the incremental expansion that occurred during mandibular lip bumper therapy in 44 adolescent patients. The purpose was to determine whether expansion occurs evenly between appointments or whether it attenuates with treatment time. Dental cast measurements were made for arch width and arch length. Treatment duration was broken into near-equal time segments and compared. Results showed that about 50\% of the total expansion achieved occurred within about the first 100 days. Forty percent of the total amount of expansion occurred during the next 200 days, with only about 10\% of the total expansion occurring after the first 300 days. It is unnecessary to have the appliance in place for longer than 300 days. The percentage of expansion that occurred at each time segment was not related to whether the patient had concomitant maxillary expansion. This article was published in Angle Orthod and referenced in Journal of Addiction Research & Therapy

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