graduate student
Saint Peterburg, St. Petersburg, Russian Federation
employee
Saint Peterburg, St. Petersburg, Russian Federation
UDC 616.314-085
CSCSTI 76.29
Aim. To clarify operating microscope (OM) usage on the long-term outcome after endodontic treatment. Material and methods. Seventy-seven patients (94 molars), aged 19–70 years, undergoing treatment for complicated caries were divided into two groups: the first group, 42 patients (54 teeth), was treated with OM; the second group, 35 patients (40 teeth), was treated without OM. The time spent on treatment per tooth, as well as the presence or absence of pulp chamber calcification, was recorded. The results were assessed after 6 and 12 months clinically and using cone-beam computed tomography. Statistical differences was p < 0.05. Results. The treatment success after 12 months was higher with OM than without it (91 % and 72 %, respectively). The use of OM contributed to the detection of additional mesio-buccal canals (MB2) in the maxillary molars (67 % and 19 %, respectively), which increased the percentage of teeth with a favorable outcome one year after endodontic treatment (p < 0.001). At 6 months after treatment, radiographically, a difference was still observed between the diagnoses and the presence of periodontal gap widening, the presence of periapical foci and the absence of changes (p < 0.05). After 12 months, the percentage of teeth without periapical changes was predominant in all groups. No difference was found between the diagnosis and the outcome. The time spent on treatment of one tooth using OM increased by an average of 10 minutes (p < 0.05). The presence of mineralization of the tooth cavity did not affect the treatment outcome (p > 0.05). Conclusion. OM usage increases the favorable treatment outcome after one year and increases the treatment time per tooth by 10 minutes. In maxillary molars, MB2 is more often found with OM. In cases where MB2 was not detected, periapical changes were detected in 88 % of cases one year after treatment.
operating microscope, endodontic treatment outcomes, complicated caries, root canal treatment, dental practice
1. Mehta D, Coleman A, Lessani M. Success and failure of endodontic treatment: predictability, complications, challenges and maintenance. Br Dent J. 2025 Apr;238(7):527-535. https://doi.org/10.1038/s41415-025-8453-5.
2. Patel S, Brown J, Pimentel T, Kelly RD, Abella F, Durack C. Cone beam computed tomography in Endodontics - a review of the literature. Int Endod J. 2019 Aug;52(8):1138-1152. https://doi.org/10.1111/iej.13115.
3. Liu B, Zhou X, Yue L, Hou B, Yu Q, Fan B, Wei X, Qiu L, Huang Z, Xia W, Sun Z, Wang H, Meng L, Peng B, Zhang C, Deng S, Lu Z, Yang D, Hou T, Jiang Q, Xie X, Liu X, Li J, Wang Z, Lyu H, Xue M, Ge J, Du Y, Zhao J, Liang J. Experts consensus on the procedure of dental operative microscope in endodontics and operative dentistry. Int J Oral Sci. 2023 Sep 18;15(1):43. https://doi.org/10.1038/s41368-023-00247-y.
4. Al Fartousi M, Gernhardt CR. Prevalence of Unfilled MB2 Canals and Their Association with Apical Periodontitis: A CBCT-Based Cross-Sectional Study in a German Population. Diagnostics (Basel). 2026 Mar 7;16(5):796. https://doi.org/10.3390/diagnostics16050796.
5. Costa FFNP, Pacheco-Yanes J, Siqueira JF Jr, Oliveira ACS, Gazzaneo I, Amorim CA, Santos PHB, Alves FRF. Association between missed canals and apical periodontitis. Int Endod J. 2019 Apr;52(4):400-406. https://doi.org/10.1111/iej.13022.
6. Baruwa AO, Martins JNR, Meirinhos J, Pereira B, Gouveia J, Quaresma SA, Monroe A, Ginjeira A. The Influence of Missed Canals on the Prevalence of Periapical Lesions in Endodontically Treated Teeth: A Cross-sectional Study. J Endod. 2020 Jan;46(1):34-39.e1. doi:https://doi.org/10.1016/j.joen.2019.10.007. Epub 2019 Nov 14. Erratum in: J Endod. 2020 Jun;46(6):881. https://doi.org/10.1016/j.joen.2020.03.009.
7. Khalighinejad N, Aminoshariae A, Kulild JC, Williams KA, Wang J, Mickel A. The Effect of the Dental Operating Microscope on the Outcome of Nonsurgical Root Canal Treatment: A Retrospective Case-control Study. J Endod. 2017 May;43(5):728-732. https://doi.org/10.1016/j.joen.2017.01.015.
8. Davies A, Patel S, Foschi F, Andiappan M, Mitchell PJ, Mannocci F. The detection of periapical pathoses using digital periapical radiography and cone beam computed tomography in endodontically retreated teeth – part 2: a 1 year post-treatment follow-up. International Endodontic Journal, 49, 623–635, 2016. https://doi.org/10.1111/j.1365-2591.2012.02076.x.
9. Bardini G, Bellido MM, Rossi-Fedele G, Casula L, Dettori C, Ideo F, Cotti E. A 4-year follow-up of root canal obturation using a calcium silicate-based sealer and a zinc oxide-eugenol sealer: A randomized clinical trial. Int Endod J. 2025 Feb;58(2):193-208. https://doi.org/10.1111/iej.14167.
10. Mashyakhy M, Hadi FA, Alhazmi HA, Alfaifi RA, Alabsi FS, Bajawi H, Alkahtany M, AbuMelha A. Prevalence of Missed Canals and Their Association with Apical Periodontitis in Posterior Endodontically Treated Teeth: A CBCT Study. Int J Dent. 2021 Jun 28;2021:9962429. https://doi.org/10.1155/2021/9962429.
11. Hao J, Liu H, Shen Y. Periapical Lesions and Missed Canals in Endodontically Treated Teeth: A Cone-Beam Computed Tomographic Study of a Chinese Subpopulation. Med Sci Monit. 2023 Jul 4;29:e940533. https://doi.org/10.12659/MSM.940533.
12. Karabucak B, Bunes A, Chehoud C, Kohli MR, Setzer F. Prevalence of Apical Periodontitis in Endodontically Treated Premolars and Molars with Untreated Canal: A Cone-beam Computed Tomography Study. J Endod. 2016 Apr;42(4):538-41. https://doi.org/10.1016/j.joen.2015.12.026.
13. Mehta D., Coleman A., Lessani M. Success and failure of endodontic treatment: predictability, complications, challenges and maintenance. British dental journal. 2025;238(7):527-535. https://doi.org/10.1038/s41415-025-8453-5
14. Patel S., Brown J., Pimentel T., Kelly R.D., Abella F., Durack C. Cone beam computed tomography in Endodontics - a review of the literature. International endodontic journal. 2019;52(8):1138-1152. https://doi.org/10.1111/iej.13115
15. Liu B., Zhou X., Yue L., Hou B., Yu Q., Fan B. et al. Experts consensus on the procedure of dental operative microscope in endodontics and operative dentistry. International journal of oral science. 2023;15(1):43. https://doi.org/10.1038/s41368-023-00247-y
16. Al Fartousi M., Gernhardt C.R. Prevalence of Unfilled MB2 Canals and Their Association with Apical Periodontitis: A CBCT-Based Cross-Sectional Study in a German Population. Diagnostics (Basel). 2026;16(5):796. https://doi.org/10.3390/diagnostics16050796
17. Costa F.F.N.P., Pacheco-Yanes J., Siqueira J.F. Jr, Oliveira A.C.S., Gazzaneo I., Amorim C.A. et al. Association between missed canals and apical periodontitis. International endodontic journal. 2019;52(4):400-406. https://doi.org/10.1111/iej.13022
18. Baruwa A.O., Martins J.N.R., Meirinhos J., Pereira B., Gouveia J., Quaresma S.A. et al. The Influence of Missed Canals on the Prevalence of Periapical Lesions in Endodontically Treated Teeth: A Cross-sectional Study. Journal of Endodontics. 2020;46(1):34-39.e1. https://doi.org/10.1016/j.joen.2019.10.007. Erratum in: J Endod. 2020;46(6):881. https://doi.org/10.1016/j.joen.2020.03.009
19. Khalighinejad N., Aminoshariae A., Kulild J.C., Williams K.A., Wang J., Mickel A. The Effect of the Dental Operating Microscope on the Outcome of Nonsurgical Root Canal Treatment: A Retrospective Case-control Study. Journal of endodontics. 2017;43(5):728-732. https://doi.org/10.1016/j.joen.2017.01.015.
20. Davies A., Patel S., Foschi F., Andiappan M., Mitchell P.J., Mannocci F. The detection of periapical pathoses using digital periapical radiography and cone beam computed tomography in endodontically retreated teeth – part 2: a 1 year post-treatment follow-up. International Endodontic Journal. 2016;49(7):623-635. https://doi.org/10.1111/iej.12500
21. Bardini G., Bellido M.M., Rossi-Fedele G., Casula L., Dettori C., Ideo F. et al. A 4-year follow-up of root canal obturation using a calcium silicate-based sealer and a zinc oxide-eugenol sealer: A randomized clinical trial. International endodontic journal. 2025;58(2):193-208. https://doi.org/10.1111/iej.14167
22. Mashyakhy M., Hadi F.A., Alhazmi H.A., Alfaifi R.A., Alabsi F.S., Bajawi H., et al. Prevalence of Missed Canals and Their Association with Apical Periodontitis in Posterior Endodontically Treated Teeth: A CBCT Study. International journal of dentistry. 2021;2021:9962429. https://doi.org/10.1155/2021/9962429
23. Hao J., Liu H., Shen Y. Periapical Lesions and Missed Canals in Endodontically Treated Teeth: A Cone-Beam Computed Tomographic Study of a Chinese Subpopulation. Medical science monitor. 2023;29:e940533. https://doi.org/10.12659/MSM.940533
24. Karabucak B., Bunes A., Chehoud C., Kohli M.R., Setzer F. Prevalence of Apical Periodontitis in Endodontically Treated Premolars and Molars with Untreated Canal: A Cone-beam Computed Tomography Study. Journal of endodontics. 2016;42(4):538-541. https://doi.org/10.1016/j.joen.2015.12.026
