The purpose of this study is to determine if mandibular first molar distal tip back during orthodontic treatment will result in improved long-term alignment of mandibular incisors. Our pre and posttreatment sample consisted of 57 Class I and Class II patients (40 female and 17 male). Incisor irregularity was recorded at T2 and T4 (average of 12.9 years postretention at T4). Molar tipback was evaluated T1 to T2 and T2 to T4. The sample was divided into 3 groups - molars tipped distally 1 degree or more during treatment, molars essentially not tipped, and molars tipped mesially 1 degree or more during treatment. A one-way ANOVA analysis of variance comparing mean change in incisor irregularity relapse total, T2 to T4, produced a significant difference in males. Males (n=17) demonstrated significantly less postretention incisor relapse (r=0.5, p=0.038) when first molars were tipped distally during treatment. Males (n=12) with bicuspid extraction exhibited even less incisor relapse (r=0.6, p=0.039). Females demonstrated variable unpredictable results.
Michael J. Fillman
Joseph M. Caruso
Roland D. W. Neufeld
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Molar; Incisor; Mandible; Dental Occlusion
Loma Linda University Libraries
This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.
Soper, Barton L., "The Effect of Mandibular First Molar Tip Back on Mandibular Incisor Long-Term Stability" (1999). Loma Linda University Electronic Theses, Dissertations & Projects. 1618.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives