Resident Name: Elliot Chiu
Title: Crowding: Timing of Treatment
Author: Anthony Gianelly DMD, PhD, MD
Journal: The Angle Orthodontist 1994
Main Purpose: To describe the best time to treat mandibular incisor crowding.
Mandibular models of 100 pts in mixed dentition were analyzed. Average crowding of 4.5mm was found in 85/100 models. The sizes of permanent successors were estimated using the Moyer’s analysis.
“What would the incidence of crowding be if a lip bumper were used to move the first molars distally 1mm?”
-Ample space for alignment can be achieved in 84/100 of these patients
-Distalization of over 1mm is associated with post-retention irregularity
-In the remaining 16/100 patients, the author prefers to extract the 1st premolars
-The key time to treat mandibular incisor crowding is in the late mixed dentition: after the eruption of the 1st premolars
The author’s conclusions are based on a theoretical treatment. This article would be stronger if actual treatment was done and the conclusions could be proved with evidence.
After 1mm of distalization with a lip bumper, what is done for retention?