Long-term effectiveness of the continuous and the sectional archwire techniques in leveling the curve of Spee

Assessment of Long-Term Stability ofLeveling of theCurve of Spee after Orthodontic Treatment in Mesocephalic Patients -A Pilot Study

“…In this study, a tendency of the curve depth to remain stable eight years after the completion of treatment in patients using lower retainer was also observed. However, some authors reported that the development of the curve of Spee after treatment is unpredictable, and also that curves that were not completely leveled had higher incidence and magnitude of relapse [17,20,22]. An association of a curve depth of approximately 2 mm in T1 (after orthodontic treatment) to a minor change in the depth of the curve over time [20] has been made OK.…”

Relapse of orthodontically corrected deepbites in accordance with growth pattern

“…In a similar study, Canut & Arias (1999) observed a mean overbite correction of 3.5 ± 1.8 mm in 30 Class II division 2 subjects during active orthodontic treatment, which relapsed 0.9 ± 1.2 mm during the post-retention period (mean duration = 7 years). Preston, Maggard, Lampasso et al (2008) found a statistically significant, but clinically insignificant, amount of relapse after levelling the Curve of Spee (COS) in deep bite patients. They also concluded that patients whose Curves of Spee were not completely level post-treatment had a greater incidence and magnitude of COS relapse, and indirectly deep bite relapse, than did those who were completely levelled.…”

“…Data for the Dolicocephalic Group 56 Table 7. Significant intergroup changes during orthodontic treatment 59 There have been many studies that have attempted to identify how the dentition, dentoalveolar and skeletal bone, and facial soft tissues respond immediately following orthodontic treatment, as well as during the years that follow the removal of retention appliances (Simons & Joondeph, 1973;Little, Riedel & Årtun, 1988;Little, 1990;Harris, 3 relapse (Engel, Damerell, McAlpine et al, 1980;Berg, 1983;Dake & Sinclair, 1989;Hirschfelder & Hertrich, 1990;Hirschfelder & Fleischer-Peters, 1992;Canut & Arias, 1999;Kim & Little, 1999;Al-Buraiki, Sadowsky & Schneider, 2005;Schutz-Fransson, Bjerklin & Lindsten, 2006;Ferrazzini, 2008;Preston, Maggard, Lampasso et al, 2008).…”

“…Various characteristics have been researched and implicated, including relapse in the Curve of Spee (De Praeter, Dermaut, Martens et al, 2002;Preston, Maggard, Lampasso et al, 2008), relapse of the interincisal angle (Binda, Kuijpers-Jagtman, Maertens et al, 1994), pressure from the lips (Lapatki, Mager, Schulte-Moenting et al, 2002;Lapatki, Klatt, Schulte-Moenting et al, 2004) , and facial type with corresponding musculature (Engel, Damerell, McAlpine et al, 1980;Berg, 1983;Ingervall & Bitsanis, 1987;Liu, Xu, Yang et al, 2005). Accordingly, if certain patients can be identified as high-risk overbite relapse candidates, treatment mechanics and retention strategies may need to be enhanced in these individuals to achieve the most stable outcome.…”

Absolute anchorage with universal t-loop mechanics for severe deepbite and maxillary anterior protrusion and its 10-year stability

“…Intrusion of the incisors can be performed by the segmented arch or the continuous archwire technique. 2,[21][22][23][24][25] One of the differences between the two methods seems to be whether the extrusion of posterior teeth is allowed or not. In terms of the long-term stability of deepbite treatment, extrusion of the premolar teeth by a continuous archwire would increase a patient's lower facial height, and this change would tend to relapse following treatment unless suitable growth occurred.…”