Long-term stability of class i premolar extraction treatment

Another way of looking at treatment stability

“…[1][2][3] Only a few scientifically sound studies have been published on the dental and skeletal changes observed in treated and untreated individuals. [4][5][6][7] Many studies pool different types of malocclusions, lack an untreated control group, or compare treated and untreated individuals that are not age matched. [8][9][10] However, it is of great value to study untreated individuals to determine the natural changes that occur in the dentition and face.…”

Efficacy of Temporary Fixed Retention Following Comprehensive Orthodontic Treatment

“…The authors attributed much of this stability to meeting specific evidence-based treatment objectives during treatment. The present study and others, as reviewed by Boley (2007, p 16), also document that acceptable long-term stability is possible and can be linked to several common characteristics of these "satisfactory stable" samples-including minimal alteration of the mandibular arch form and the retraction and uprighting or maintenance of mandibular incisors in their original position (Boley et al 2003).…”

“…Some researchers claim that continuous significant and unpredictable relapse can be expected following orthodontic treatment (Little et al 1981(Little et al , 1988, others acknowledge continued changes in skeletal dimensions with age, but that rates of relapse diminish over time and long-term stability is possible (Sadowsky and Sakols 1982;Vaden et al 1997;Gardner et al 1998;Harris et al 1999;Boley et al 2003), while still others document differential rates of relapse for various locations in the dental arches posttreatment (Sadowsky et al 1994;Al Yami et al 1999). Sadowsky et al (1994) evaluated the stability of 22 orthodontic patients who were treated nonextraction a minimum of 5 years after all retention had been removed.…”

“…In a study of 32 patients treated by the same practitioner, who had been out of retention for a minimum of 5 years, Boley et al (2003) documented acceptable stability of mandibular incisors at an average of 15 years posttreatment (11.7 years postretention). Mean Incisor Irregularity at the longterm recall was 2.6 mm; however, this sample had a much greater degree of Incisor Irregularity at pretreatment than most previous studies ( x = 8.1 mm).…”

Age-Related Long-Term Posttreatment Occlusal and Arch Changes

“…[2][3][4] Posttreatment crowding has been regularly observed, along with changes in overjet, overbite, arch length, and arch width. [5][6][7][8][9][10][11][12][13] While postretention changes should be expected to occur, explanations for the changes are lacking. Most studies have reported little or no correlation between the treatment changes that occurred and the posttreatment changes.…”