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Abstract: Objectivesdistolingual root of the permanent mandibular first molar (PMFM-DLR) has been frequently reported, which may complicate the treatment of periodontitis. This study aimed to assess the morphological features of PMFM-DLR and investigate the correlation between the morphological features of PMFM-DLR and periodontal status in patients with Eastern Chinese ethnic background.
Materials and methodsA total of 836 cone beam computed tomography (CBCT) images with 1497 mandibular first molars were analyzed to observe the prevalence of PMFM-DLR at the patients and tooth levels in Eastern China. Among them, complete periodontal charts were available for 69 Chinese patients with 103 teeth. Correlation and regression analyses were used to evaluate the correlation between the morphological features of DLR, bone loss, and periodontal clinical parameters, including clinical attachment loss (CAL), probing pocket depth (PPD), gingival recession (GR), and furcation involvement (FI).
ResultsThe patient-level prevalence and tooth-level prevalence of DLR in mandibular first molars were 29.4% and 26.3%, respectively. Multiple linear regression analysis suggested that bone loss at the lingual site and CAL were negatively affected by the angle of separation between distolingual and mesial roots in the transverse section, while they were significantly influenced by age and the angle of separation between distobuccal and mesial roots in the coronal section.
ConclusionsThe prevalence of PMFM-DLR in Eastern China was relatively high in our cohort. The morphological features of DLR were correlated with the periodontal status of mandibular first molars. This study provides critical information on the morphological features of DLR for improved diagnosis and treatment options of mandibular molars with DLR.

下颌第一磨牙远舌根的存在与牙周状态的临床相关性分析：一项采用锥形射束电脑断层扫描分析的横断面研究

[1]AbellaF, PatelS, Durán-SindreuF, et al., 2012. Mandibular first molars with disto-lingual roots: review and clinical management. Int Endod J, 45(11):963-978.

[2]AungNM, MyintKK, 2022. Three-rooted permanent mandibular first molars: a meta-analysis of prevalence. Int J Dent, 2022:9411076.

[3]BlanchardSB, DerderianGM, AverittTR, et al., 2012. Cervical enamel projections and associated pouch-like opening in mandibular furcations. J Periodontol, 83(2):198-203.

[4]ChandraSS, ChandraS, ShankarP, et al., 2011. Prevalence of radix entomolaris in mandibular permanent first molars: a study in a South Indian population. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 112(3):e77-e82.

[5]ChenQM, WangYH, ShuaiJ, 2023. Current status and future prospects of stomatology research. J Zhejiang Univ-Sci B (Biomed & Biotechnol), 24(10):853-867.

[6]ChenWP, ChangSH, TangCY, et al., 2018. Composition analysis and feature selection of the oral microbiota associated with periodontal disease. Biomed Res Int, 2018:3130607.

[7]CurzonMEJ, 1973. Three-rooted mandibular permanent molars in English Caucasians. J Dent Res, 52(1):181.

[8]DannewitzB, ZeidlerA, HüsingJ, et al., 2016. Loss of molars in periodontally treated patients: results 10 years and more after active periodontal therapy. J Clin Periodontol, 43(1):53-62.

[9]de MoorRJG, DerooseCAJG, CalbersonFLG, 2004. The radix entomolaris in mandibular first molars: an endodontic challenge. Int Endod J, 37(11):789-799.

[10]FarhadianM, ShokouhiP, TorkzabanP, 2020. A decision support system based on support vector machine for diagnosis of periodontal disease. BMC Res Notes, 13:337.

[11]GoldsteinAR, 1979. Enamel pearls as a contributing factor in periodontal breakdown. J Am Dent Assoc, 99(2):210-211.

[12]GraetzC, SchützholdS, PlaumannA, et al., 2015. Prognostic factors for the loss of molars ‒ an 18-years retrospective cohort study. J Clin Periodontol, 42(10):943-950.

[13]GuYC, LuQ, WangHG, et al., 2010. Root canal morphology of permanent three-rooted mandibular first molars—Part I: pulp floor and root canal system. J Endod, 36(6):990-994.

[14]HampSE, NymanS, LindheJ, 1975. Periodontal treatment of multi rooted teeth. J Clin Periodontol, 2(3):126-135.

[15]HoDKL, WongJHL, PelekosG, et al., 2021. Prevalence and morphological characteristics of disto-lingual roots in mandibular first molars: a cone beam CT study with diagnostic and therapeutic implications. Clin Oral Invest, 25(6):4023-4030.

[16]HouGL, TsaiCC, 1993. Relationship between palatoradicular grooves and localized periodontitis. J Clin Periodontol, 20(9):678-682.

[17]HsuCL, HuangJE, ChenHL, et al., 2021. The relationship of the occurrence between three-rooted deciduous mandibular second molars and three-rooted permanent mandibular first molars in children. J Dent Sci, 16(2):580-585.

[18]HuangRY, LinCD, LeeMS, et al., 2007. Mandibular disto-lingual root: a consideration in periodontal therapy. J Periodontol, 78(8):1485-1490.

[19]HuangRY, ChengWC, ChenCJ, et al., 2010. Three-dimensional analysis of the root morphology of mandibular first molars with distolingual roots. Int Endod J, 43(6):478-484.

[20]JangJK, PetersOA, LeeW, et al., 2013. Incidence of three roots and/or four root canals in the permanent mandibular first molars in a Korean sub-population. Clin Oral Invest, 17(1):105-111.

[21]KimKR, SongJS, KimSO, et al., 2013. Morphological changes in the crown of mandibular molars with an additional distolingual root. Arch Oral Biol, 58(3):248-253.

[22]LeeWC, NiCW, LinFG, et al., 2016. Crown morphology of the mandibular first molars with distolingual roots. J Dent Sci, 11(2):189-195.

[23]LinZT, HuQG, WangTM, et al., 2014. Use of CBCT to investigate the root canal morphology of mandibular incisors. Surg Radiol Anat, 36(9):877-882.

[24]MischKA, YiES, SarmentDP, 2006. Accuracy of cone beam computed tomography for periodontal defect measurements. J Periodontol, 77(7):1261-1266.

[25]MolA, BalasundaramA, 2008. In vitro cone beam computed tomography imaging of periodontal bone. Dentomaxillofac Radiol, 37(6):319-324.

[26]NibaliL, ZavattiniA, NagataK, et al., 2016. Tooth loss in molars with and without furcation involvement ‒ a systematic review and meta-analysis. J Clin Periodontol, 43(2):156-166.

[27]SharmaP, CockwellP, DietrichT, et al., 2017. INfluence of Successful Periodontal Intervention in REnal Disease (INSPIRED): study protocol for a randomised controlled pilot clinical trial. Trials, 18:535.

[28]SongJS, KimSO, ChoiBJ, et al., 2009. Incidence and relationship of an additional root in the mandibular first permanent molar and primary molars. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 107(1):e56-e60.

[29]SongJS, ChoiHJ, JungIY, et al., 2010. The prevalence and morphologic classification of distolingual roots in the mandibular molars in a Korean population. J Endod, 36(4):653-657.

[30]SperberGH, MoreauJL, 1998. Study of the number of roots and canals in Senegalese first permanent mandibular molars. Int Endod J, 31(2):117-122.

[31]ThurzoA, UrbanováW, NovákB, et al., 2022. Where is the artificial intelligence applied in dentistry? Systematic review and literature analysis. Healthcare, 10(7):1269.

[32]TuMG, TsaiCC, JouMJ, et al., 2007. Prevalence of three-rooted mandibular first molars among Taiwanese individuals. J Endod, 33(10):1163-1166.

[33]TuMG, HuangHL, HsueSS, et al., 2009. Detection of permanent three-rooted mandibular first molars by cone-beam computed tomography imaging in Taiwanese individuals. J Endod, 35(4):503-507.

[34]TonettiMS, ChristiansenAL, CortelliniP, 2017. Vertical subclassification predicts survival of molars with class II furcation involvement during supportive periodontal care. J Clin Periodontol, 44(11):1140-1144.

[35]TurnerCG II, 1971. Three-rooted mandibular first permanent molars and the question of American Indian origins. Am J Phys Anthropol, 34(2):229-241.

[36]WoelberJP, FleinerJ, RauJ, et al., 2018. Accuracy and usefulness of CBCT in periodontology: a systematic review of the literature. Int J Periodontics Restorative Dent, 38(2):289-297.