Investigation on Apical Morphology of Mandibular First Molar Using Micro-computed Tomography

doi:10.13701/j.cnki.kqyxyj.2016.09.011

Abstract

Abstract: Objective: To investigate the apical morphology of the mandibular first molar in Chinese population using micro-computed tomographic technique. Methods: A total of 152 mandibular first molars were scanned by micro-competed tomography with the resolution of 30 μm. The 3-dimensional (3D) images of all specimens in apical 5mm of the roots were reconstructed. The numbers of roots and root canal, the numbers of apical foramina and lateral/accessory foramina, the prevalence and types of isthmus were recorded. Results: The incidence of two separated roots of the first molars was 94.08%. The incidence of three separated roots was 61.84%. The percentage of two apical foramina in the mesial roots was 60.91%. The percentage of lateral/accessory foramina was 37.27% in the mesial roots and was 33.01% in the distal roots. The incidence of root canal isthmus was 73.68%. Type IV in isthmuses was the most common configurations. Conclusion: The apical canal configuration of mandibular first molars was complicated and should be taken into account during nonsurgical and surgical endodontic procedures.

Key words: Micro-computed tomography, Mandibular first molars, Isthmus, Apical morphology

CLC Number:

R781.2

Yi , HE Miao , LU Guan-fan. Investigation on Apical Morphology of Mandibular First Molar Using Micro-computed Tomography[J]. Journal of Oral Science Research, 2016, 32(9): 937-940.

References

[1] Gu L, Wei X, Ling J, et al. A microcomputed tomographic study of canal isthmuses in the mesial root of mandibular first molars in a Chinese population [J]. J Endod, 2009, 35(3)∶353-356
[2] Kontakiotis EG, Palamidakis FD, Farmakis ET, et al. Comparison of isthmus detection methods in the apical third of mesial roots of maxillary and mandibular first molars: macroscopic observation versus operating microscope [J]. Braz Dent J, 2010, 21(5)∶428-431
[3] Hsu Y, Kim S. The resected root surface: the issue of canal isthmuses [J]. Dent Clin N Am, 1997, 3∶529-540
[4] 闵艺,马净植,高原,等.上颌第一前磨牙根管峡区充填技术的实验研究[J].口腔医学研究,2011,27(10)∶902-904
[5] Bornstein MM, Lauber R, Sendi P, et al. Comparison of periapical radiography and limited cone-beam computed tomography in mandibular molars for analysis of anatomical landmarks before apical surgery [J]. J Endod, 2011, 37(2)∶151-157
[6] Kim Y, Perinpanayagam H, Lee JK, et al. Comparison of mandibular first molar mesial root canal morphology using micro-computed tomography and clearing technique [J]. Acta Odontol Scand, 2015, 73(6)∶427-432
[7] Wada M, Takase T, Nakanuma K, et al. Clinical study of refractory apical periodontitis treated by apicoectomy. Part 1. Root canal morphology of resected apex [J]. Int Endod J, 1998, 31(1)∶53-56
[8] Tronstad L, Sunde PT. The evolving new understanding of endodontic infections [J]. Endodt Top, 2003, 6(1)∶57-77
[9] Haapasalo M, Udnaes T, Erndal U. Persistent, recurrent, and acquired infection of the root canal system post-treatment [J]. Endod Top, 2003, 6∶29-56
[10] Vertucci, FJ. Root Canal Morphology and Its Relationship to Endodontic Procedures [J]. Endod Top, 2005, 10(1)∶3-29
[11] Cambruzzi JV, Marshall FJ. Molar endodontic surgery [J]. J Can Dent Assoc, 1983, 49(1)∶61-65
[12] Rubinstein R, Kim S. Long-term follow-up of cases considered healing one year after apical microsurgery [J]. J Endod, 2002, 28(5)∶378-383
[13] Mannocci F, Peru M, Sherriff M, et al. The isthmuses of the mesial root of mandibular molars: a micro-computed tomographic study [J]. Int Endod J, 2005, 38(8)∶558-563
[14] Rubinstein R, Kim S. Short-term observation of the results of endodontic surgery with the use of a surgical operating microscope and Super EBA as root end filling material [J]. J Endod, 1999, 25(1)∶43-48
[15] Morfis A, Sylaras SN, Georgopoulou M, et al. Study of the apices of human permanent teeth with the use of a scanning electron microscope [J]. Oral Surg Oral Med Oral Pathol, 1994, 77(2)∶172-176