An in Vitro Study of 3D Printing Technology in Positioning Calcified Root Canal Orifice of Maxillary First Molar

doi:10.13701/j.cnki.kqyxyj.2021.09.010

Abstract

Abstract: Objective: To evaluate the accuracy of positioning and clearing the calcified root canals by a root canal guide by simulating the calcified root canals of the maxillary first molars in vitro. Methods: Twenty four extracted maxillary first molars were selected (excluding MB2, the total number of root canals was 72). For set A, CBCT was taken before all root canals were prepared and obturated to simulate calcified root canals. CBCT was taken again (set B) to analyze whether the establishment of the simulated calcified root canal model was successful. After confirming, for all simulated calcified root canals, Eguide implant software was used to design and print a 3D guide plate to locate the calcified root canal orifices of maxillary first molars (set C). ET20 ultrasound tip was used to locate the orifices of root canals according to the guide plate. The calcified root canals were cleared to 2mm below the root canal orifices (set D). The mimics 21.0 software was used to measure the difference between the maximum mesio-distal and bucco-lingual diameters at 2mm below the root canal orifices in sets A and B. The matic 13.0 software was used to measure the mesio-distal, buccal-lingual, corono-apical, and anglular deviations between the B, C, and D sets at the level of the root canal orifices and 2 mm below the root canal orifices. Results: The 3D printing technology assisted in positioning and clearing the simulated calcified root canal orifice of the maxillary first molar successfully. The difference between sets A and B was not statistically significant (P>0.05). The 3D printing technology assisted in positioning and clearing the simulated calcified root canal orifice of the maxillary first molar successfully. There were no statistical differences in the three-dimensional and angular deviations between sets B, C, and D (P>0.05). Conclusion: (1) The method of simulating root canal calcification in this experiment is feasible and may be applied to subsequent experiments. (2) The method of using 3D printed guides to locate and clear calcified root canals is highly accurate, and provides a preliminary experimental basis for the 3D printed guides in the mouth to guide the clearing of calcified root canals of molars.

Key words: 3D printing technology, 3D printing guide, canal calcification, root canal treatment, the maxillary first molar

XUE Yuan, LI Xia. An in Vitro Study of 3D Printing Technology in Positioning Calcified Root Canal Orifice of Maxillary First Molar[J]. Journal of Oral Science Research, 2021, 37(9): 814-819.

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