INDAGINE CEFALOMETRICA ORTODONTICA 3D: DAL FULL SIZE AI FOV RIDOTTI

OBJECTIVE CBCT IS ASSOCIATED WITH SIGNIFICANTLY HIGHER RADIATION EXPOSURE,IN PARTICULAR WITH LARGE FIELDS OF VIEW (FOV) THAN CONVENTIONAL X-RAY TECHNIQUES COMMONLY USED IN ORTHODONTICS. THE AIM OF THIS STUDY IS TO DESCRIBE A NEW MEDIUM FOV THREE DIMENSIONAL CEPHALOMETRIC ANALYSIS ON CBCT AND TO COMPARE THIS METHOD FOR ORTHODONTIC SAGITTAL DIAGNOSIS WITH TWO TRADITIONAL BI-DIMENSIONAL ANALYSES. MATERIALS AND METHODS 35 CBCT EXAMS (14 MALE; 21 FEMALE) WITH MEAN AGE 19,37+-11,76 WERE SELECTED FROM THE ARCHIVE OF THE DEPARTMENT OF DENTISTRY OF ARMY MILITARY HOSPITAL, MILAN, ITALY. A MEDIUM FOV THREE DIMENSIONAL CEPHALOMETRIC ANALYSIS COMPOSED OF 21 LANDMARKS (10 MIDSAGITAL AND 5 BILATERAL) AND 24 MEASUREMENTS (12 LINEAR, 12 ANGULAR) WERE PERFORMED USING A SOFTWEAR MIMICS RESEARCH® V. 17.0 (NV, TECHNOLOGIELAAN 15, 3001 LEUVEN, BELGIUM). ORTHODONTIC SAGITTAL ANALYSIS BASED ON TRADITIONAL BI-DIMENSIONAL EXAMINATIONS WAS CALCULATED WITH ANB ANGLE AND WITS INDEX. COHEN’S WEIGHTED KAPPA WAS USED FOR STATISTICAL ANALYSIS TO PERFORM THE INTER RATER CONCORDANCE OF THE THREE DIFFERENT ORTHODONTIC SAGITTAL EXAMINATIONS. RESULTS ORTHODONTIC SAGITTAL DIAGNOSIS HAD PERFECT AGREEMENT COMPARING MEDIUM FOV THREE DIMENSIONAL CEPHALOMETRIC ANALYSIS (FA-FB DISTANCE) AND ANB ANGLE (K=1). ORTHODONTIC SAGITTAL DIAGNOSIS HAD MODERATE AGREEMENT COMPARING MEDIUM FOV THREE DIMENSIONAL CEPHALOMETRIC ANALYSIS (FA-FB DISTANCE) AND WITS INDEX (K=0,57). CONCLUSIONS MEDIUM FOV THREE DIMENSIONAL CEPHALOMETRIC ANALYSIS IS SUFFICIENTLY PRECISE AND RELIABLE FOR ORTHODONTIC SAGITTAL DIAGNOSIS, COMPARED WITH CONVENTIONAL METHODS OF EXAMINATION, PROVIDING AN ADVANTAGE OF THE REDUCED IONIZING RADIATION EXPOSURE.