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      Evaluation of the soft tissue treatment simulation module of a computerized cephalometric program

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          The purpose of this study is to compare the accuracy of the treatment simulation module of Quick Ceph Studio (QCS) program to the actual treatment results in Class II Division 1 patients.


          Retrospective study.

          Materials and Methods:

          Twenty-six skeletal Class II patients treated with functional appliances were included. T0 and T1 lateral cephalograms were digitized using QCS. Before applying treatment simulation to the digitized cephalograms, the actual T0-T1 difference was calculated for the SNA, SNB, ANB angles, maxillary incisor inclination, and protrusion and mandibular incisor inclination and protrusion values. Next, using the treatment simulation module, the aforementioned values for the T0 cephalograms were manually entered to match the actual T1 values taking into account the T0-T1 differences. Paired sample t-test were applied to determine the difference between actual and treatment simulation measurements.


          No significant differences were found for the anteroposterior location of the landmarks. Upper lip, soft tissue A point, soft tissue pogonion, and soft tissue B point measurements showed statistically significant difference between actual and treatment simulation in the vertical plane.


          Quick Ceph program was reliable in terms of reflecting the sagittal changes that would probably occur with treatment and growth. However, vertical positions of the upper lip, soft tissue pogonion, soft tissue A point, and soft tissue B point were statistically different from actual results.

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          Most cited references 28

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          G*Power is a free power analysis program for a variety of statistical tests. We present extensions and improvements of the version introduced by Faul, Erdfelder, Lang, and Buchner (2007) in the domain of correlation and regression analyses. In the new version, we have added procedures to analyze the power of tests based on (1) single-sample tetrachoric correlations, (2) comparisons of dependent correlations, (3) bivariate linear regression, (4) multiple linear regression based on the random predictor model, (5) logistic regression, and (6) Poisson regression. We describe these new features and provide a brief introduction to their scope and handling.
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              The Frankfort horizontal as a basis for cephalometric analysis.

              A random sample of 79 British 12-year-old children was studied from tracings registered in the natural head position (NHP). The angle between the Frankfort horizontal (FH) and the horizontal at right angles to the plumb line was measured. Two experienced assessors checked every tracing; for those children perceived to show unnatural head position this was adjusted to what they considered to be the natural head orientation (NHO). The NHO was defined as the head orientation of the subject perceived by the clinician, based on general experience, as the NHP in a standing, relaxed body and head posture, when the subject is looking at a distant point at eye level. The FHK horizontal angle was then measured, now related to the corrected head position. The standard deviation for the latter angle was smaller than that of the uncorrected, but still too large for the FH to be considered reliable as a basis for clinical cephalometric analysis. No statistically significant difference in variability as found between FH and the sella-nasion line. The extracranial horizontal plane related to NHO was recommended as the least variable of the references studied.

                Author and article information

                [1 ]Department of Orthodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkiye
                [2 ]Department of Orthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkiye
                Author notes
                Correspondence: Dr. Aslihan Zeynep Oz Email: aslihanzeynepoz@
                Eur J Dent
                Eur J Dent
                European Journal of Dentistry
                Medknow Publications & Media Pvt Ltd (India )
                Apr-Jun 2014
                : 8
                : 2
                : 229-233
                4054055 EJD-8-229 10.4103/1305-7456.130614
                Copyright: © European Journal of Dentistry

                This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Original Article


                soft tissue changes, treatment simulation, computerized cephalometry


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