[The study on the effects of different shapes of nasopalatine canals on tooth movement and implantation during orthodontic and implant treatment with CBCT].

PURPOSE

The aim of this study was to evaluate the impact of the nasopalatine canal(NPC) shape and its morphometric characteristics on expected teeth movement by assessing the distance to maxillary central incisors (MCIs) according to NPC type.

METHODS

A total of 200 patients with CBCT imaging data meeting the inclusion criteria were selected. The nasopharyngeal canal in the sagittal plane was classified. The following parameters were obtained: incisor foramen diameter, nasopalatine canal length, anterio-posterior diameter of incisor foramen (A-P IF), anterio-posterior diameter of Stenson foramen (A-P NF), nasopalatine tube 1/2 length diameter(M-L IF), and the distance between NPC and MCIs. The data were analyzed with SPSS 26.0 software package.

RESULTS

Diameter of incisor hole（P=0.045）, A-P IF（P=0.001）, M-L IF（P＜0.001）, A-P NF（P＜0.001） had significant difference. In cylindrical-shaped NPC, a significant correlation was observed for NPC length, while in funnel-shaped NPC, a significant correlation was observed for A-P IF and NPC length. In hourglass-shaped NPC, a significant correlation was observed for A-P IF, A-P NF, and NPC length.

CONCLUSIONS

Each NPC shape showed specific impacts on the relationship between NPC diameters at different sections and distances to MCIs.