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ORIGINAL ARTICLE
Year : 2017  |  Volume : 29  |  Issue : 1  |  Page : 43-46

Interrelationship between root dentin thickness and root length in mesial root of mandibular first molar: An in vitro study


Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Ahmedabad, Gujarat, India

Correspondence Address:
Malav J Thakrar
Room No. 8-9, Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Ahmedabad - 380 016, Gujarat
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/endo.endo_7_17

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Introduction: The aim of this study was to investigate the relation between the distal wall thickness and length of the mesial root of mandibular first molars at different positions along the length of the root. Methods: Forty-five mandibular first molars were selected, and their lengths, from the tip of the mesiolingual cusp to the root apex, were recorded. The collected teeth were then divided into three groups according to their length: Group I – long (24.2 mm ± 1.8 mm), Group II – medium (21 mm ± 1.5 mm), and Group III – short (16.8 mm ± 1.8 mm). The mesial root of each tooth was marked at two levels – first at 2 mm below the furcation and second at the junction of the apical and middle third of the root. The thinnest portion of the distal root dentin of the buccal and lingual canals of the mesial roots was recorded. The distance between the buccal and lingual canals and the depth of concavity in the distal surface of the mesial roots were also measured. Results: Statistical analysis was performed using analysis of variance and the Student–Newman–Keuls test. The minimum thickness of the distal wall of the mesiobuccal canal was significantly different (P < 0.001) between Groups 1 (long) and 3 (short). Conclusions: Distal wall thickness of the mesiobuccal root and distal concavity of the mesial root of mandibular first molars were found to be thinner in longer teeth compared with shorter teeth.


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