Methodische Schwierigkeiten bei der Anwendung der Röntgenkephalometrie in der Kieferorthopädie

Schmuth, G. P. F.

doi:10.1007/bf02170656

Cited by 19 publications

(7 citation statements)

References 6 publications

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“…Keywords: regression analysis, vestibular-lingual tilt of the tooth (tork), mesiodistal inclination of the tooth (angulation), tooth rotation (rotation), computed tomography, teleroentgenography, young men, young women, orthognathic bite. [11,14,15,24,29,30,31,33]. Anatomical points were determined taking into account the recommendations of A. E. Athanasiou [3], S. I. Doroshenko and Y.…”

Section: Methodsmentioning

confidence: 99%

Determination of individual angular characteristics of the teeth positions according to the computer tomography in Ukrainian adolescents with orthognathic bite

Dmitriev

Волков

Glushak

et al. 2018

Biomed. and Biosoc. Anthrop.

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The lack of the ability to determine the individual standard angle characteristics of the position of the teeth and the technical provision of their control often does not lead to the expected result and in each case requires individualization, the vision of which is based, as a rule, on the experience and intuition of the doctor. In order to solve such a situation, in addition to improving the positioning protocols of the non-removable equipment, the physician should be able to clearly identify the individual angular characteristics of the tooth-jaw system. The purpose of the study – by studying computer tomography and cephalometric indices and conducting direct stepwise regression analysis to develop in Ukrainian adolescents with orthognathic bite mathematical models of individual angular positions of teeth. Using the Veraviewepocs 3D device, Morita (Japan) at 38 young men (aged from 17 to 21) and 55 young women (aged from 16 to 20 years) with normal occlusion close to orthognathic bite received and analyzed dental tomograms and lateral teleroentgenograms. Cephalometric points and measurements were performed according to recommendations of A. M. Schwarz, J. McNamara, W. B. Downs, R. A. Holdway, G. P. F. Schmuth, C. C. Steiner and C. H. Tweed. Anatomical points were determined taking into account the recommendations of A. E. Athanasiou and S. I. Doroshenko and Y. A. Kulginsky. The simulation of CT indexes describing the position of individual teeth relative to each other, to the bone cranial structures and the profile of adolescents with orthognathic bite, depending on the metric characteristics of the skull, which are usually unchanged during surgical and orthodontic treatment, as well as the width, lengths, angles and positions of the upper and lower jaws that may be altered by orthodontic surgery done. The statistical processing of the obtained results was carried out in the license package “Statistica 6.0” using a direct stepwise regression analysis. It was found that in young men of 40 possible models, 23 were constructed with a determination coefficient R2 of 0.557 to 0.832, while in young women, only 8 models with a determination coefficient R2 of 0.581 to 0.832. Moreover, in the young men – of 10 possible 9 models of vestibular-tongue inclination of corresponding teeth (R2 from 0.557 to 0.832) were constructed; out of 10 possible 5 models of mesio-distal inclination of corresponding teeth (R2 from 0.558 to 0.769) constructed; of the possible 14 constructed 6 models of rotation of the corresponding teeth (R2 from 0.579 to 0.737); and in young women - there are only 5 models of vestibular-tongue inclination of the corresponding teeth (R2 from 0.603 to 0.665). In addition, in both young men and young women, models of the size of the inter-incision angle (R2 0.748 in young men and 0.581 in young women) were constructed, the magnitude of the angle of inclination of the lower canine in the jet plane (R2 respectively 0.729 and 0.793), and the magnitude of the inclination of the closure planes relative to the palatal plane (R2 respectively 0.808 and 0.832). In the analysis it was found that in young men, most frequently models included - indicator WITS (7.0%); angle GL_SNPOG (5.4%); distance S_E, angle ММ, angle NSBA (by 4.7%); angle AB_NPOG, angle N_POG_, distance N_SE, coefficient N_SP_SP, angle P_OR_N (by 3.9%). In young women, most frequently models included – angle N_POG_ (14.3%); angle AB_NPOG (10.2%); indicator WITS (8.2%); angle ММ, angle ANB, length of the branch of the mandible R_ASC (by 6.1%). Thus, in the work with the help of the method of step-by-step regression with inclusion, among Ukrainian adolescence, on the basis of peculiarities of computer-tomographic and teleroentgenography indices, reliable models of computer-tomographic individual linear angular characteristics of the position of teeth necessary for constructing the correct three-dimensional geometry of dental arches are developed and analyzed.

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Section: Methodsmentioning

confidence: 99%

Determination of individual angular characteristics of the teeth positions according to the computer tomography in Ukrainian adolescents with orthognathic bite

Dmitriev

Волков

Glushak

et al. 2018

Biomed. and Biosoc. Anthrop.

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“…This applies all the more to 7-to 14-year-old orthodontic patients. The manual cephalometric tracing of facial soft tissues structures also proved to be difficult in incorrectly exposed radiographs [17].…”

Section: Diskussionmentioning

confidence: 99%

“…Dies gilt umso mehr für sieben-bis 14-jährige Patienten in kieferorthopädischen Praxen. Es zeigte sich allerdings auch, dass sich die manuelle kephalometrische Durchzeichnung von Weichteilstrukturen des Gesichts bei fehlbelichteten Röntgenaufnahmen mitunter als schwierig erwies [17].…”

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Reliability and Validity of the Digigraph® 100 in Orthodontic Diagnosis

et al. 2001

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Cephalometric analyses of lateral cephalograms allow important statements to be made on diagnosis and treatment planning. Such radiographs should, however, be taken with a considerable reduction in radiation exposure. With the Digigraph 100 (Dolphin Imaging Systems Inc., USA) a cephalometric technique based on distance measurements of emitted sonic signals is now available. This study was aimed at determining the degree to which this procedure can cope with the requirements of reliability and validity in the field of orthodontics. For this purpose 50 volunteers were examined by conventional cephalometry with manual tracing of lateral cephalograms as well as by sonic cephalometry, with Jarabak analysis in both cases. In addition an option was available for reading lateral cephalograms into the Digigraph by means of a radiograph evaluation program. The 31 evaluated parameters were subjected to modified statistical analysis. Good reliability was recorded in the range between 0.96 and 0.99 for eleven sonic cephalometric measurements, whereas 26 values were between 0.69 and 0.95. The validity was significantly lower in comparison to radiocephalometry. In particular, measurements related to landmarks which were difficult to access or could be only indirectly determined, such as the sella point, the articulare point or the apices of the incisors, proved to be weak points of sonic cephalometry. The device is thus indicated rather in the field of communication with the patient or for intermediate examination without radiation exposure. Cephalometry without radiation exposure would represent decisive progress in orthodontic diagnostics. However, some developmental work on the processing software or even the development of a specific sonic cephalometry which deliberately dispenses with parameters that are difficult to record with this procedure is still needed.

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“…To objectivize the determination of the position of the lower incisors, the researchers studied the location of the central axes and the position of the cutting edge and the vestibular (lip) surface to different cephalometric planes [8,24,[26][27][28]30]. But the use of unified standards is criticized by many researchers, proving the variability of these indicators.…”

Section: Introductionmentioning

confidence: 99%

Determination of individual teleroentgenographic characteristics of the lower medial incisors position in Ukrainian young men and young women with orthognathic bite

et al. 2018

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Ethnic, sexual and age features of the incisors positions point to the need for the development of techniques that allow to determine their individual characteristics, since commonly accepted standards recommended for optimal positioning of incisors can only be used as indicative. The purpose of the study – by studying teleroentgenographic indices and conducting direct stepwise regression analysis in young men and young women of Ukraine with orthognathic bite, to develop and analyze the mathematical models of individual characteristics of the position of the lower medial incisors. With the Veraviewepocs 3D device, Morita (Japan) in 38 young men (17 to 21 years of age) and 55 young women (aged from 16 to 20 years) with occlusion close to orthognathic bite and balanced faces received side teleroentgenograms. Cephalometric analysis was performed using OnyxCeph3TM software. Cephalometric points and measurements were performed according to the recommendations of A.M. Schwarz, J. McNamara, W.B. Downs, R.A. Holdway, P.F. Schmuth, C.C. Steiner and C.H. Tweed. According to the above methods, in the licensed package “Statistica 6.0” using direct straight line regression analysis, the teleroentgenographic characteristics of the position of the lower medial incisors (distance 1l_NB, distance 1l_APog, angle 1l_DOP, IMPA angle, Mand1_NB angle, FMIA angle and Mand1_MeIm angle) were performed. In young men with orthognathic bite of 7 possible models of teleroentgenographic characteristics of the lower medial incisors, 5 were constructed with determination coefficient R2 from 0.694 to 0.849, and in young women, all 7 possible models with determination coefficient R2 from 0.595 to 0.794. In young men most often the regression equations included - the angle ANB and facial vertical index GL_SN_S (by 11.5%); lower face height ANS_ME, face angle NBA_PTGN and distance S_E (by 7.7%). In young women most often the regression equations included – the angle of N_POG (16.7%); Wits indicator (13.9%); inclination angle I (8.3%); H-angle, maxillo-mandibular angle MM and angle of facial axis NBA_PTGN (by 5.6%). Thus, in the work with the help of the method of stepwise regression with inclusion, among Ukrainians of juvenile age, on the basis of features teleroentgenographic indicators, the analysis of reliable models of individual teleroentgenographic characteristics of the position of the lower medial incisors was developed and carried out.

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Methodische Schwierigkeiten bei der Anwendung der Röntgenkephalometrie in der Kieferorthopädie

Cited by 19 publications

References 6 publications

Determination of individual angular characteristics of the teeth positions according to the computer tomography in Ukrainian adolescents with orthognathic bite

Determination of individual angular characteristics of the teeth positions according to the computer tomography in Ukrainian adolescents with orthognathic bite

Reliability and Validity of the Digigraph® 100 in Orthodontic Diagnosis

Determination of individual teleroentgenographic characteristics of the lower medial incisors position in Ukrainian young men and young women with orthognathic bite

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