Surgery First: Proposal of a new method to identify and quantify transition occlusal interferences: a retrospective study.

This study proposes a new method for the clinical practice to identify occlusal interferences that would make the “Surgery First” an unpredictable approach in its outcomes. According to the ABO certification, 29 patients with Class III skeletal malocclusion were selected. All the models were scanned using 3Shape TRIOS by the same operator. The models were imported into a SAM 2P articulator. The surgery-first approach was virtually simulated to eliminate occlusal interferences. The quantity and type of movement were calculated assuming the use of F22 aligners (Sweden & Martina, Due Carrare, Padova). Linear Regression Analysis was used to determine the association between the continuous variables, treatment duration, and gender and age. The sample included 29 patients (19 females and 10 males) aged between 21 and 48 years. The analysis shows only a weak significance of the duration of the pre-surgical phase (COP) in relation to age and gender combined. Considering the duration of COP, post-surgical phase, and the combination of both, nothing statistically significant is highlighted. This study shows a virtual decrease in the times of pre-surgical therapy by 2.8 months, ranging from 0 to 4.9 months. The protocol previously described is a valuable tool for the orthodontist; it is evident that the set-up provides an essential device for the 'Surgery First.' However, further studies are necessary to validate this method statistically.

This study proposes a new method for the clinical practice to identify occlusal interferences that would make the “Surgery First” an unpredictable approach in its outcomes. According to the ABO certification, 29 patients with Class III skeletal malocclusion were selected. All the models were scanned using 3Shape TRIOS® by the same operator. The models were imported into a SAM 2P articulator. The surgery-first approach was virtually simulated to eliminate occlusal interferences. The quantity and type of movement were calculated assuming the use of F22 aligners (Sweden & Martina, Due Carrare, Padova). Linear Regression Analysis was used to determine the association between the continuous variables, treatment duration, and gender and age. The sample included 29 patients (19 females and 10 males) aged between 21 and 48 years. The analysis shows only a weak significance of the duration of the pre-surgical phase (COP) in relation to age and gender combined. Considering the duration of COP, p...