Longitudinal Cephalometric Changes of Orthodontic Patients Evaluated Long-Term

Ku, Lisa

doi:10.21007/etd.cghs.2010.0167

Cited by 1 publication

(4 citation statements)

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“…The decrease in chord length due to mesial drift would cause the lower incisors either to crowd (increasing Incisor Irregularity) or tip labially. However, in a cephalometric study on the present sample, Ku (2010) found no change in the average angulation of the lower incisors posttreatment. That is, the "average" person in the sample experienced no systematic change after treatment, though some individuals in the sample experienced appreciable shifts.…”

Section: Bivariate Correlations During the Posttreatment Periodcontrasting

confidence: 89%

“…Posttreatment decreases in chord length likely are due to the mesial drift of teeth in the buccal segments probably in combination with changes in incisor position and angulation. However, Ku (2010) found no posttreatment change in both the inclination and anterior-posterior position of the lower incisors in a long-term cephalometric study on the present sample. attributed the "mesial drift" of teeth to the "anterior component of force in the dentition."…”

Section: Bivariate Correlations During the Posttreatment Periodcontrasting

confidence: 88%

“…Uprighting of the lower incisors over time could account for the decrease in arch length (Siatkowski 1974). However, Ku (2010) found no systematic posttreatment change in either the inclination or the anterior-posterior position of the lower incisors in the present sample. A similar maturational process for both treated and untreated groups could be explained by the "mesial drift" due to the "anterior component of force" (Southard et al , 1990.…”

Section: Arch Lengthcontrasting

confidence: 81%

“…Ku (2010) found that the upper incisor uprighted 1.5˚ on average during the posttreatment period. The posttreatment uprighting of the upper incisor would explain the correlation (r = 0.57) between posttreatment decreases in maxillary incisor-to-molar chord and upper arch depth .…”

Section: Bivariate Correlations During the Posttreatment Periodmentioning

confidence: 94%

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Long-Term Changes in the Dental Occlusion of Subjects Treated Orthodontically

Dyer¹

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CommentsA major challenge in orthodontics is to provide a treatment result that remains stable after appliances are removed. Orthodontic treatment can move teeth from their neutral positions, which increases potential for future relapse. The literature from the University of Washington, Seattle, shows that relapse is pervasive and of considerable magnitude (Little RM. Stability and relapse of mandibular anterior alignment: University of Washington studies. Semin Orthod 1999;5:191-204). The intent of this study was to quantify the posttreatment dental changes that occurred over approximately a quarter-century in a cohort of women who had received comprehensive orthodontic treatment as teenagers. Dental casts of 52 individuals were made at the start of treatment, at the end of the active phase of treatment, and at the long-term recall examination. Subjects were treated comprehensively by a single experienced orthodontist using Tweed edgewise mechanics. The amount of in-treatment change is one of the few identifiable predictors of the vectors of posttreatment relapse. Arch length and width decreased with age, accompanied by a 1.1 mm "relapse" in Incisor Irregularity during the posttreatment period. Arch depth decreased 1.3 mm during the posttreatment interval. Intercanine width was increased (2.2 mm) during treatment, but decreased (1.2 mm) towards the initial dimension after treatment. About half (1.0 mm) of the in-treatment intercanine expansion persisted at the recall examination. Intermolar width did not change significantly after treatment. Overjet increased and overbite deepened after treatment. Half (0.6 mm) of the treatment correction in overbite was lost during the posttreatment period. Buccal segment and canine relationship both remained stable after treatment. This suggests that, once established, cusp-fossa relationships tend to persist with time. Correction of the maxillary Incisor Irregularity remained stable with age (1% relapse). 65% of the correction in mandibular Incisor Irregularity was maintained over the long-term period. The mandibular Incisor Irregularity at the recall examination was less than 3.5 mm in 77% of the cases, which is the upper limit suggested as being clinically This thesis is available at UTHSC Digital Commons: https://dc.uthsc.edu/dissertations/70 acceptable. The University of Washington studies reported that less than 30% of their cases exhibited clinically acceptable long-term mandibular Incisor Irregularity (Little RM, Wallen TR, Riedel RA. Stability and relapse of mandibular anterior alignment-first premolar extraction cases treated by traditional edgewise orthodontics. Am J Orthod 1981;80:349-65). The present results exhibit less relapse than those reported in most long-term recall studies, which suggests that the extent of relapse may be less in other venues.

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Section: Bivariate Correlations During the Posttreatment Periodcontrasting

confidence: 89%

Section: Bivariate Correlations During the Posttreatment Periodcontrasting

confidence: 88%