Morphological study on the Danger Zone of the mesiobuccal canal prepared by three nickel-titanium rotary systems using three-dimensional printed mandibular first molars
10.13591/j.cnki.kqyx.2025.06.006
- VernacularTitle:3种机用镍钛系统对3D打印的下颌第一磨牙近中颊根危险区形态的影响
- Author:
Yuqing LIU
1
;
Jiayun DAI
;
Duo ZHOU
;
Xingyang WANG
;
Fulu XU
;
Juan WANG
Author Information
1. 南京医科大学附属口腔医院牙体牙髓病科,江苏南京(210029);口腔疾病研究与防治国家级重点实验室培育建设点,江苏南京(210029);江苏省口腔转化医学工程研究中心,江苏南京(210029)
- Publication Type:Journal Article
- Keywords:
endodontic instrumentation;
nickel-titanium instruments;
three-dimensional printing;
danger zone;
micro-computed tomography
- From:
STOMATOLOGY
2025;45(6):430-435
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the effects of three nickel-titanium file systems,ProTaper Next,TruNatomy,and VDW.RO-TATE,on the morphology of the Danger Zone of the mesial buccal root of mandibular first molar after root canal preparation using Mi-cro-CT and 3D printing technology.Methods 3D-printed mandibular first molars were selected and designed for purpose.They were randomly divided into three groups according to the used NiTi files(n=20).Micro-CT was used to scan the cross-sectional images of the Danger Zone 2 mm below the furcation of the mesial buccal root before and after root canal preparation.The changes in the root ca-nal wall thickness,root canal volume,surface area,cross-sectional area,and root canal transportation in the Danger Zone were ob-served.Statistical analysis was performed using one-way ANOVA(P＜0.05).Results Statistically significant differences were observed before and after root canal preparation in the Danger Zone among the three groups(P＜0.05).Among the three groups,the PTN files caused the largest change before and after preparation,followed by VDW files,and the TRU files had the smallest change.Conclusion The study highlights TruNatomy's conservative shaping capacity,advocating its use in minimally invasive endodontics,whereas Pro-Taper Next may be reserved for cases requiring aggressive canal preparation.
