Zúñiga PJR, Peña TE, Baena-Caldas GP

Language: Spanish
References: 19
Page: 1-16
PDF size: 424.58 Kb.

ABSTRACT

Introduction: Universally, it has been accepted that the postero-anterior cephalogram presents less distortion than any other x-ray radiograph; for this reason, the measurements taken on it are considered reliable.
Objective: To determine for a postero-anterior cephalogram, what percentage of distortion is present in different regions of the skull and mandible.
Methods: Thirty human skulls with their mandibles were divided by three horizontal and four vertical planes in fifteen quadrants, resulting ten in the skull and five in the mandible. In each quadrant, one vertical and one horizontal steel wire were fixed and their lengths were measured (real value). To each set, a postero-anterior cephalogram was taken and the wire images were measured (radiograph value).
Results: No measurement could be taken in the lateral quadrants of the skull. The horizontal measurement in the right and left intermediate inferior quadrants of the skull and in the right and left intermediate and lateral quadrants of the mandible is not reliable; in the median quadrant of the mandible it is minimized; in the median superior and inferior and intermediate superior right and left quadrants of the skull it is magnified. The vertical measurement in all the quadrants is reliable; in the right and left intermediate superior quadrants of the skull and right and left intermediate and lateral quadrants of the mandible it is magnified; in the right and left intermediate inferior and median superior and inferior quadrants of the skull and median quadrant of the mandible it is minimized. The minimum distortion for both measurements is present in the median superior quadrant of the skull. The percentage of distortion in each quadrant for both measurements is reported.
Conclusions: Distortion is present in the postero-anterior cephalogram and it varies from one region to another of the face.

REFERENCES

1. Méndez JA. Evaluación de la distorsión en las radiografías laterales cefalométricas tomadas en nuestro medio. Rev Odontos. 2002;11:15-30.

2. Kim JY, Jung HD, Jung YS, Hwang CJ, Park HS. A simple classification of facial asymmetry by TML system. J Craniomaxillofac Surg. 2014;42(4):313-20.

3. Perez I, Chavez AK, Ponce D. Applicability of the Ricketts' posteroanterior cephalometry for sex determination using logistic regression analysis in Hispano American Peruvians. J Forensic Dent Sci. 2016;8(2):111.

4. Verma K, Nahar P, Singh MP, Mathur H, Bhuvaneshwari S. Use of frontal sinus and nasal septum pattern as an aid in personal identification and determination of gender: A Radiographic Study. J Clin Diagn Res. 2017;11(1):ZC71-4.

5. Verma P, Verma K, Khosa R, Kumar S, Basavaraju S, Patwardhan N. Combined use of frontal sinus and nasal septum patterns as an aid in forensics: A digital radiographic study. N Am J Med Sci. 2015;7(2):47-52.

6. Su N, van Wijk A, Berkhout E, Sanderink G, De Lange J, Wang H, et al. Predictive value of panoramic radiography for injury of inferior alveolar nerve after mandibular third molar surgery. J Oral Maxillofac Surg. 2017;75(4):663-79.

7. Sanders DA, Chandhoke TK, Uribe FA, Rigali PH, Nanda R. Quantification of skeletal asymmetries in normal adolescents: cone-beam computed tomography analysis. Prog Orthod. 2014;15(1):26.

8. Baena G, Zúñiga J, Peña E. Distorsión en imágenes obtenidas mediante tomografía computarizada de cono. Rev Esp Cirug Oral Maxilofac. 2013;35(2):51-8.

9. Pittayapat P, Bornstein MM, Imada TSN, Coucke W, Lambrichts I, Jacobs R. Accuracy of linear measurements using three imaging modalities: two lateral cephalograms and one 3D model from CBCT data. Eur J Orthod. 2014;37(2):202-8.

10. Lee HJ, Lee S, Lee EJ, Song IJ, Kang BC, Lee JS, et al. A comparative study of the deviation of the menton on posteroanterior cephalograms and three-dimensional computed tomography. Imaging Sci Dent. 2016;46(1):33-8.

11. Park HY, Lee JS, Cho JH, Hwang HS, Lee KM. Accuracy of three-dimensional cephalograms generated using a biplanar imaging system. Korean J Orthod. 2018;48(5):292-303.

12. Choi SH, Kim JS, Kim CS, Yu HS, Hwang CJ. Cone-beam computed tomography for the assessment of root-crown ratios of the maxillary and mandibular incisors in a Korean population. Korean J Orthod. 2016;47(1):39-49.

13. Carranza N, Bonta H, Gualtieri AF, Rojas MA, Galli FG, Caride F. Alveolar dimensional changes relevant to implant placement after minimally traumatic tooth extraction with primary closure. Acta Odontol Latinoam. 2016;29(2):105-14.

14. Shaikh SA, Lekha K, Mathur G. Relationship Between Occlusal Plane and Three Levels of Ala Tragus line in Dentulous and Partially Dentulous Patients in Different Age Groups: A Pilot Study. J Clin Diagn Res. 2015;9(2):ZC39-42.

15. Huh YJ, Huh KH, Kim HK, Nam SE, Song HY, Lee JH, et al. Constancy of the angle between the Frankfort horizontal plane and the sella-nasion line: A nine-year longitudinal study. Angle Orthod. 2014;84(2):286-91.

16. Ghorai L, Asha M, Lekshmy J, Rajarathnam B, Mahesh Kumar H. Orbital aperture morphometry in Indian population: A digital radiographic study. J Forensic Dent Sci. 2017;9(2):61-4.

17. Gaddam R, Shashikumar HC, Lokesh NK, Suma T, Arya S, Shwetha GS. Assessment of image distortion from head rotation in lateral cephalometry. J Int Oral Health. 2015;7(6):35-40.

18. Shokri A, Miresmaeili A, Farhadian N, Falah-kooshki S, Amini P, Mollaie N. Effect of changing the head position on accuracy of transverse measurements of the maxillofacial region made on cone beam computed tomography and conventional posterior-anterior cephalograms. Dentomaxillofac Radiol. 2017;46(5):1-12.

19. Damstra J, Fourie Z, Ren Y. Evaluation and comparison of postero-anterior cephalograms and cone-beam computed tomography images for the detection of mandibular asymmetry. Eur J Orthod. 2013;35(1):45-50.