ANÁLISE CEFALOMÉTRICA TRIDIMENSIONAL ATRAVÉS DA TOMOGRAFIA MULTISLICE COM PROTOCOLO DE BAIXA DOSE DE RADIAÇÃO
ANÁLISE CEFALOMÉTRICA TRIDIMENSIONAL ATRAVÉS DA TOMOGRAFIA MULTISLICE COM PROTOCOLO DE BAIXA DOSE DE RADIAÇÃO
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DOI: 10.22533/at.ed.6272322092
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Palavras-chave: Cefalometria. Radiografia. Diagnóstico por Raios-X
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Keywords: Cephalometry. X-ray. X-ray diagnosis.
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Abstract: This study focuses on the assessment of facial, maxillary and mandibular structures through three-dimensional images obtained with low-dose multislice computed tomography. The study compares conventional orthodontic cephalometry performed by lateral normal teleradiography with cephalometry obtained by medical tomography with modified acquisition protocol. The sample size calculation was performed using the G.Power program, using as parameters the effect size of 0.5, considering standard error of 5% and power of 80%. Because it is a dependent sample, the sample size was obtained by comparing two means. From these parameters a necessary sample of 34 patients was obtained. The sample consisted of patients who already had orthodontic documentation and who needed complementary diagnosis for any specific situation, such as planning third molar extractions or teeth included. Dental atypical situations were considered in order to indicate computed tomography, since no patient was exposed to radiation without need or without further diagnostic refinement. After acquisition of the images, the cephalometric points and tracings that made up the orthodontic documentation were redone and the marking and measurements obtained by Multislice Tomography were performed by a calibrated examiner using the RadioCef - RadioMemory Program (Belo Horizonte, MG, Brazil). Statistical analysis was performed using STATA 14.0 software (Stata Statistical Software: Release 14. College Station, TX: StataCorp LP). The Shapiro-Wilk test was used to verify the normality of the data. Subsequently, comparison tests were used to verify the mean differences between cephalometric and MSC tomography measurements. Variables that presented data normality (P> 0.05) were evaluated by the t-test, and those that indicated non- normality of data (P <0.05) were evaluated by the Kruskal Wallis test. The results indicated that cephalometric analysis performed through the acquisition of multislice computed tomography does not differ from cephalometry through lateral normal teleradiography, conventionally obtained in orthodontic documentation. There was no statistical difference between the two cephalometric methods, confirming the hypothesis that medical tomography cephalometry can be reliably used for orthodontic diagnosis, following a low radiation protocol without compromising the quality of the images obtained.
- Kaline Thumé Antunes
- Paula Guerino
- Gustavo Nogara Dotto
- Vilmar Antônio Ferrazzo
- Mariana Marquezan
- Renésio Armindo Grehs