Chin J Dent Res 2025;28(3):209–217; doi:10.3290/j.cjdr.b6553449
Influence of Depth and Choice of Operating Instruments on the Precision of Dynamic Navigation Systems
Writer:Xiao Xiang HUANG, Ding Xiang YUAN, Ben Xiang HOU Clicked:
Objective: To explore the clinical and socio-demographic factors influencing oral healthrelated quality of life (OHRQoL) of Chinese adults in the 4th National Oral Health Survey. Methods: Multistage stratified cluster sampling and PPS method were used in sampling and 4720 adults aged 35 to 44 years were recruited. The study subjects completed a structured questionnaire in an interview and underwent a clinical examination. The questionnaire was a Putonghua version of the General Oral Health Assessment Index (GOHAI) and was completed by the interviewer on the site of the 4th National Oral Health Survey. Clinical examination was performed using the criteria recommended by the World Health Organization (WHO). Results: The mean GOHAI score of the subjects was 54.42 (SD 6.01). Result of Poisson regression showed that subjects with a higher household income per capita, had lower DMFT, fewer missing teeth, had no unrepaired missing teeth, or had no partial denture had higher GOHAI scores indicating better OHRQoL. Conc
Objective: To evaluate the precision and efficiency of dynamic navigation-assisted trephines and fissure drills at varying depths utilising a 3D printed model.
Methods: A computer-designed in vitro standardised model was 3D printed using photosensitive resin, with hemispherical cavities reserved at depths of 5, 10 and 15 mm from the outer surface of the model. CBCT scans were taken before the procedure, and the data were imported into dynamic navigation software. Navigation paths were planned and executed using a trephine with a diameter of 4 mm and a fissure drill with a diameter of 1.2 mm guided by the dynamic navigation system. Ten procedures were performed at each depth. Postoperative CBCT scans were taken to reconstruct the navigated trajectories, and the platform deviations, end deviations and angular deviations were calculated by comparing the actual paths with the planned paths. The operating time was recorded.
Results: Under the guidance of the dynamic navigation system, the mean platform, end and angular deviations for trephines were 0.34 ± 0.17 mm, 0.25 ± 0.15 mm and 1.02 ± 0.49 degrees, respectively. For fissure drills, the mean deviations were 0.29 ± 0.13 mm, 0.31 ± 0.18 mm, and 1.33 ± 0.98 degrees, respectively. No significant differences were found with different depths or instrument types (P > 0.05). High-speed handpieces with fissure drills showed superior efficiency to low-speed handpieces with trephines (P < 0.001).
Conclusion: Dynamic navigation technology achieved good accuracy within a 15-mm depth range. The use of a trephine or fissure drill did not affect the accuracy of the dynamic navigation technique. High-speed handpieces with fissure drills showed superior efficiency.
Keywords: CBCT, computer-assisted, dynamic navigation, 3D printing
(editor:CJDR) |