Radiographic evaluation of orthodontic treatment by means of four different cephalometric superimposition methods

Abstract

INTRODUCTION: Despite discussion on the merit of various cephalometric superimposition methods, there remains a need to assess which one can be used in daily practice with reasonably accuracy and less working time. OBJECTIVE: The aim of this study was to investigate four methods of cephalometric superimposition by means of assessing the longitudinal changes in craniofacial morphology caused by growth and response of adolescents with Class I malocclusion to orthodontic treatment involving first premolar extraction. METHODS: Pretreatment (T1) and post-treatment (T2) standardized lateral cephalometric radiographs of 31 adolescents (20 females and 11 males), with Angle Class I malocclusion and indication of premolar extraction, participated in this study. Radiographs were digitized, traced and had structures identified by means of a cephalometric software. Four superimposition methods were used: Björk structural method, Steiner/Tweed SN line, Ricketts N-Ba line at N-point and Ricketts N-Ba line at CC-point. Positional changes were quantified by horizontal and vertical linear changes in the following cephalometric landmarks: anterior/posterior nasal spine (ANS and PNS), gnathion (Gn), Gonion (Go), Pogonion (Pog), A-point and B-point. Differences between T1 and T2 in horizontal and vertical positional changes for all superimposition methods were assessed by one-way analysis of variance (ANOVA) and Bonferroni correction (p < 0.05). RESULTS: There were no statistically significant differences among the cephalometric superimposition methods or when patients' sex was considered. CONCLUSION: Björk structural method, Steiner/Tweed SN line, Ricketts N-Ba line at N-point and Ricketts N-Ba line at CC-point methods were reliable and presented similar precision when the overall facial changes due to active growth and/or orthodontic treatment were examined.

Vertical growth in mono‐and dizygotic twins: A longitudinal cephalometric cohort study

“…This is especially the case for historical studies such as this one, where radiographs from the 1950s‐80s are used that lack the clarity of more recent radiographs. Additionally, several different structural superimposition methods have been proposed with many studies reporting conflicting results about their relative strengths and weaknesses . Furthermore, some studies have demonstrated specific inaccuracies of superimposition methods, while other studies suggest the use of multiple superimposition methods for optimum results, which might be time‐consuming.…”

<p>Perawatan impaksi gigi kaninus dan gigitan bersilang anterior menggunakan teknik open window dan piggyback pada alat ortodonti straight wire</p><p>Treatment of canine impaction and crossbite anterior using the open window and piggyback techniques on straight wire orthodontic appliance</p>

“…Superimposed tracing sefalometri radiograf pada pasien sebelum dan sesudah perawatan perlu dilakukan karena memiliki tingkat akurasi yang baik untuk menunjukkan perubahan posisi horisontal dan vertikal yang tepat, sehingga memungkinkan dokter gigi untuk melakukan penilaian keseluruhan dari efek yang terjadi karena pertumbuhan dan/ atau perawatan ortodontik. 15 Pasien dalam laporan kasus ini mengalami erupsi penuh pada gigi 13 impaksi dalam waktu 3 bulan setelah bedah open window dan kurang dari 1 bulan setelah perlekatan breket pada gigi tersebut.…”

Hyaluronic Acid for Mental and Mandibular Contour

“…0.3 ml in total was used in the region of the inferior lip (above the mentus) Fig. 19 Blue arrow indicates the ptosis area in the mandibular line, which should not be filled Lenza et al (2015) For the lips, the use of cannula or needles is possible, and the choice will depend on whether the aim is to volumize or contour (Fig. 20).…”