Study on the application value of micro CT in observation of root canal morphous of maxillary first premolar

ZHOU Meijuan; DENG Xuxia

doi:10.3969/j.issn.1002-7386.2018.10.020

Abstract：Objective To investigate the changes of anatomic form of apical foramen of maxillary first premolar in order to provide theoretical basis forroot canal therapy of maxillary first premolar in different age patients.Methods A total of 30 exelcymosis maxillary first premolars with age marker were divided into three groups:group A (20 to 39 years),group B (40 to 59 years),group C (60 years and above),with 10 premolars in each group.The SCANCO MEDICAL μ-CT80 micro CT tomoscan was used to examined these premolars,and MIMICS 8.0 analysis software was use to measur the diameter of the root hole,moreover SPSS 13.0 statistical software was used to analyze the results.Results The physiological root hole diameter of maxillary first premolar was average (0.253 ± 0.075) mm,there was significant difference between group A and group C (P ＜ 0.05) and between group B and group C (P ＜ 0.05).However there was no significant difference between group A and group B (P ＞ 0.05).The physiological root hole shape of maxillary first premolar was round (22.45％),ellipse (61.22％) and irregular shape (16.33％),but there was no significant difference in apical foramen shape among the three groups (P ＞ 0.05).The single rooted tooth and double rooted tooth were commonly found in maxillary first premolar,and triple rooted tooth was relatively rare,and there was no significant difference in the incidence rate of single rooted tooth and double rooted tooth among the three groups (P ＞ 0.05).In root canal type,the incidence rate of single tube (type Ⅰ) was 33.33％,that of double root canal (Ⅱ ～ Ⅶ) was 63.33％,and that of three root canal (Ⅷ) was 3.33％.Condusion The maxillary first molar root canal system anatomical shape is complex,the apical foramen diameter of maxillary first premolar is decreased in the elderly,while the apical foramen shape is not changed with age increasing,which is mainly elliptic,however simple root canal and double root canal are most commonly observed in clinical practice.