Measurement of the mesiobuccal root canal width and taper of maxillary first molars

doi:10.19439/j.sjos.2018.01.008

Abstract

Abstract: PURPOSE: To measure the root canal morphology of the maxillary first molars, to provide reference for clinical work. METHODS: Fifty maxillary first molars were collected and the mesiobuccal root canal taper was observed through production of transparent tooth. The mesiobuccal roots were dissected transversely from their apical foramen vertical to the long axis of the root and 0.4-mm-thick serial sections were made. Each section was observed with a stereomicroscope at 30× magnification to calculate the taper value of apical 1/3, middle third 1/3 and canal orifice 1/3. RESULTS: The width of MB1 root canal: maximum and minimum diameter of root apex was (0.38±0.12) mm and (0.34±0.16) mm, maximum and minimum diameter of root middle was (0.55±0.26) mm and (0.57±0.12) mm, maximum and minimum diameter of root collar was (1.13±0.34) mm and (0.59±0.18) mm. The width of MB2 root canal taper: maximum and minimum diameter of root apex was (0.25±0.13) mm and (0.28±0.10) mm, maximum and minimum diameter of root middle was (0.36±0.09) mm and (0.17±0.06) mm, maximum and minimum diameter of root collar was (0.79±0.23) mm and (0.23±0.17) mm. The taper of MB1 root canal: maximum and minimum diameter of root apical 1/3 was 0.03 and 0.01, maximum and minimum diameter of root middle 1/3 was 0.06 and 0.03, maximum and minimum diameter of root collar 1/3 was 0.10 and 0.09. The taper of MB2 root canal: maximum and minimum diameter of root apical 1/3 was 0.02 and - 0.01, maximum and minimum diameter of root middle 1/3 was 0.06 and 0.00, maximum and minimum diameter of root collar 1/3 was -0.02 and -0.02. CONCLUSIONS: MB1 has a larger width and taper, and root apical 1/3, middle 1/3, collar 1/3 have variable taper; While the width and taper of MB2 are small, and there will be upside down taper.

Key words: Maxillary first molars, Root canal morphology, Root canal width, Root canal taper

CLC Number:

R781.3

GOU Jing-xue, CHEN Yao, LIU Gui-hong. Measurement of the mesiobuccal root canal width and taper of maxillary first molars[J]. Shanghai Journal of Stomatology, 2018, 27(1): 34-38.

References

[1] Jou YT, Karabucak B, Levin J, et al.Endodontic working width: current concepts and techniques[J]. Dent Clin N Am, 2004, 48(1): 323-335.
[2] Awazawa Y, Hayashi K, Awazawa I, et al.On the size of apical foramen in anterior teeth, bicuspids and molars[J]. Bull Group Int Rech Sci Stomatol Odont, 1991, 34(3-4): 117-122.
[3] 范兵, 边专, 樊明文. 牙体牙髓临床治疗Ⅱ.根管预备的工作长度、宽度和锥度[J]. 中华口腔医学杂志, 2006, 41(3): 184-187.
[4] 安少锋, 凌均棨, 高燕. 根管预备锥度对根管桩固位力的影响的实验研究[J]. 实用口腔医学杂志, 2008, 24(4): 510-513.
[5] 岳林, 韩怡. 第一恒磨牙根尖区根管自然锥度的研究[J]. 北京大学学报(医学版), 2010, 42(1): 20-23.
[6] 岳保利, 吴友农. 中国人恒牙及根管形态图谱 [M]. 北京: 世界图书出版公司, 1995.
[7] 李颖, 周梦宇, 牛卫东. 不同脱钙条件对透明牙体标本制作影响的试验研究[J]. 华西口腔医学杂志, 2009, 27(1): 13-19.
[8] 谢蓓蓓, 陈文霞. 不同脱钙液对透明牙制作的影响[J]. 临床口腔医学杂志, 2015, 31(9): 518-520.
[9] 张志勇, 孙洁. 牙科数字成像系统、锥形束CT及透明牙对离体第一恒磨牙根管系统诊断价值的对比性研究[J]. 华西口腔医学杂志, 2013, 31(5): 441-447.
[10] Blattner TC, George N, Lee CC, et al.Efficacy of cone-beam computed tomography as a modality to accurately identify the presence of second mesiobuccal canals in maxillary first and second molars: a pilot study[J]. J Endod, 2010, 36(5): 867-870.
[11] Rundquist BD, Versluis A.How does canal taper affect root stresses?[J]. Int Endod J, 2006, 39(3): 226-237.
[12] Lertchirakarn V, Palamara JE, Messer HH.Patterns of vertical root fracture: factors affecting stress distribution in the root canal[J]. J Endod, 2003, 29(8): 523-528.
[13] Sathorn C, Palamara JE, Palamara D, et al.Effect of root canal size and external root surface morphology on fracture susceptibility and pattern: a finite element analysis[J]. J Endod, 2005, 31(4): 288-292.
[14] Tan BT, Messer HH.The quality of apical canal preparation using hand and rotary instruments with specific criteria for enlargement based on initial apical file size[J]. J Endod, 2002, 28(9): 658-664.
[15] Cohen S, Blanco L, Berman L.Vertical root fractures: clinical and radiographic diagnosis[J]. J Am Dent Assoc, 2003, 134(4): 434-441.
[16] Raiden G, Koss S, Costa L, et al.Radiographic measurement of residual root thickness in premolars with post preparation[J]. J Endod, 2001, 27(4): 296-298.
[17] Arvaniti IS, Khabbaz MG.Influence of root canal taper on its cleanliness: a scanning electron microscopic study[J]. J Endod, 2011, 37(6): 871-874.
[18] Cohenca N, Paranjpe A, Heilborn C, et al.Antimicrobial efficacy of two irrigation techniques in tapered and non-tapered canal preparations a randomized controlled clinical trial[J]. Quintessence Int, 2013, 44(3): 217-228.
[19] Mohammadzadeh Akhlaghi N, Rahimifard N, Moshari A, et al.The effect of size and taper of apical preparation in reducing intra-canal bacteria: a quantitative SEM study[J]. Iran Endod J, 2014, 9(1): 61-65.
[20] Tabrizizadeh M, Kazemipoor M, Hekmati-Moghadam SH, et al.Impact of root canal preparation size and taper on coronal-apical micro-leakage using glucose penetration method[J]. J Clin Exp Dent, 2014, 6(4): e344-e349.
[21] Grande NM, Plotino G, Pecci R, et al.Micro-computerized tomographic analysis of radicular and canal morphology of premolars with long oval canals[J]. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2008, 106(3): e70-e76 .
[22] Wu MK, Roris A, Barkis D, et al.Prevalence and extent of long oval canals in the apical third[J]. Oral Surg Oral Med Oral Pathol Oral Radiol Endod, 2000, 89(6): 739-743.
[23] 高燕, 凌均棨, 安少锋. 上颌磨牙近中颊根根管截面形态的研究[J]. 牙体牙髓牙周病学杂志, 2006, 16(9): 505-507.
[24] 张迎. 山东地区人群第一恒磨牙根管原始锥度及横截面形态的研究[D]. 济南: 山东大学, 2016.