Impact of retraction force magnitudes on mobility of maxillary canines: a split-mouth design

• Published in: Progress in orthodontics Vol. 23; no. 1; p. 14
• Main Authors: Albelasy, Nehal F., Abdelnaby, Yasser L.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 02.05.2022; Springer Nature B.V; SpringerOpen
• Subjects: Canine mobility; Canine retraction; Canine teeth; Cuspid; Dentistry; Face; Humans; Independent sample; Maxilla; Medicine; Mobility; Mouth; Orthodontics; Periotest; PTVs; Retraction force; Software; Statistical analysis; Statistics; Tooth Movement Techniques; Canine retraction; Retraction force; Periotest; PTVs; Canine mobility
• ISSN: 2196-1042; 1723-7785; 2196-1042
• DOI: 10.1186/s40510-022-00408-5

Objective Prospective evaluation of the maxillary canine mobility during retraction using two different force levels over 5 months of retraction. Materials and methods Thirty patients indicated for maximum retraction of maxillary canines with age range of 14.7–18.9 years were included in the study. After complete leveling and alignment and immediately before canine retraction, the mobility of the maxillary canines was measured using the Periotest device and repeated monthly. A split-mouth design was applied where on the one side, the retraction force was 100 g, while on the other side 200 g of force. Four subgroups were investigated: A1 (R3 100 g), A2 (L3 200 g), B1 (R3 200 g) and B2 (L3 100 g). The total amount of canine retraction was measured for each side using the pre- and post-retraction dental casts. Results The collected data were normally distributed. ANOVA test showed insignificant statistical difference in Periotest values (PTVs) among the four subgroups pre-retraction and monthly p  > 0.05. However, each group showed a statistically significant difference in PTVs over the 5 months. The independent sample t test showed a statistical insignificant difference in PTVs between the 100 g and 200 g retraction force. Pearson correlation of the PTVs to the period of retraction was statistically significant p  < 0.05 while being in significant to the retraction force p  > 0.05. Conclusion Increasing the retraction force of maxillary canines up to 200 g of force does not significantly increase the teeth mobility during orthodontic treatment. There is a positive correlation between the PTVs and the duration of tooth movement regardless the magnitude of force.