Beenish Elahee Rizvi, Syed Shah Faisal, Huma Siddique.
Changes in skeletal and dental structures after leveling the curve of spee with continuous archwire.
Ann Abbasi Shaheed Hosp Karachi Med Dent Coll Jan ;18(2):63-7.

Objective: To determine the changes in skeletal and dental structures after leveling the curve of Spee with continuous archwire. Methods: Descriptive study was carried out in the orthodontics department of Alvi Dental Hospital, Karachi, from June to December 2011. Thirty one subjects requiring othtodontic treatment were included in this study. All patients received fixed appliance therapy nad reverse curve continuous archwire for six months. Change in the mean values of L4-MP (measured from cusp tip of the first premolar perpendicular to mandibular plane), L6-MP (measured from cusp tip of the lower first molar perpendicular to mandibular plane), overjet, overbite, L1-APog (measured as the distance of man-dibular incisor to the line drawn from point A to pogonion), IMPA (Incisor Mandibular Plane Angle), FOP-MP (measured as Functional Occlusal Plane angle to the Mandibular Plane) and LAFH (Lower Anterior Face Height) were measured on cephalogram and compared to pretreatment values. Results: Mean change in dental variables; L4-MP, overjet, overbite, IMPA, L1-A-pog was significant whereas L6-MP was not significant. Mean change in both the skeletal variables FOP-MP and LAFH was found to be significant. Conclusion: Continuous archwire technique effectively leveled curve of Spee in this sample of Class II Division 1 deep bite patients treated without extraction. Leveling of curve of Spee occured mainly due to premolar extrusion, mandibular incisor protrusion and raised IMPA to a slightly higher limit from the normal range. In this study leveling curve of Spee with continuous archwire significantly increased functional occlusal plane to mandibular plane and lower anterior face height. Highly significant decreases in overjet and overbite were observed which can also be contributed to leveling of curve of Spee.

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