PMC9900149_01
A) CBCT scan showing furcation perforation; B) STL file of cast scan of the mandibular arch; C) CBCT scan showing planning of the 3D endodontic guide; D) Designing of the 3D endodontic guide; E) K-file #15 inserted through the 3D endodontic guide in the mesiobuccal canal; F) Rotary file inserted through the 3D endodontic guide in the mesiobuccal canal; G) Preparation of the mesiobuccal canal with the rotary file reaching the woCrking length; H) Periapical radiograph showing K-file #15 in the mesiobuccal canal; I) Periapical radiograph showing the master gutta-percha cones reaching the working length; J) Immediate postoperative periapical radiograph showing the obturated canals and the MTA sealing the furcation perforation; K) One-year-follow-up periapical radiograph showing evidence of healing
IEJ-18-65-g001.jpg
PMC9900149_01_IEJ-18-65-g001.jpg
F1
The coronal access cavity was then sealed using resin-modified glass ionomer restoration (Figure 1). 
PMC9900149_02
A) CBCT scan showing furcation perforation; B) STL file of cast scan of the mandibular arch; C) CBCT scan showing planning of the 3D endodontic guide; D) designing of the 3D endodontic guide; E) K-file #15 inserted through the 3D endodontic guide in the mesiobuccal canal; F) rotary file inserted through the 3D endodontic guide in the mesiobuccal canal; G) preparation of the mesiobuccal canal with the rotary file reaching the working length; H) periapical radiograph showing K-file #15 in the mesiobuccal canal; I) periapical radiograph showing the master gutta percha cones reaching the working length; J) immediate postoperative periapical radiograph showing the obturated canals and the MTA sealing the furcation perforation; K) Six-months follow-up periapical radiograph showing evidence of healing
IEJ-18-65-g002.jpg
PMC9900149_02_IEJ-18-65-g002.jpg
F2
The data was transferred to a three-dimensional printer Form 3 (Formlabs, Somerville, MA, USA), and the three-dimensional templates were fabricated (Figure 2).