Volumetric measurement of root resorption following molar mini-screw implant intrusion using cone beam computed tomography

Li, Wen, Chen, Fei, Zhang, Feng, Ding, Wanghui, Ye, Qingsong, Shi, Jiejun, and Fu, Baiping (2013) Volumetric measurement of root resorption following molar mini-screw implant intrusion using cone beam computed tomography. PLoS ONE, 8 (4). e60962. pp. 1-7.

[img]
Preview
PDF (Published Version) - Published Version
Available under License Creative Commons Attribution.

Download (11MB)
View at Publisher Website: http://dx.doi.org/10.1371/journal.pone.0...
 
8
97


Abstract

OBJECTIVE: Molar intrusion by mini-screw implantation can cause different degrees of root resorption. However, most methods (2-D and 3-D) used for evaluating root resorption have focused on the root length without considering 3-D resorption. The purpose of this study was to volumetrically evaluate root resorption using cone beam computed tomography(CBCT) after mini-screw implant intrusion.

MATERIALS AND METHODS: 1. The volumes of 32 teeth were measured using CBCT and laser scanning to verify the accuracy of CBCT. 2. Twelve overerupted molars from adult patients were investigated in this study. After mini-screw implants were inserted into the buccal and palatal alveolar bones, 150 g of force was applied to the mini-screw implants on each side to intrude the molars. CBCT images of all patients were taken immediately prior to intrusion and after intrusion. The volumes of the roots were calculated using the Mimics software program. The differences between the pre-intrusion and post-intrusion root volumes were statistically evaluated with a paired-samples t-test. In addition, the losses of the roots were statistically compared with each other using one-way analysis of variance at the P<0.05 level.

RESULTS: No statistically significant volume differences were observed between the physical (laser scanning) and CBCT measurements (P>0.05). The overerupted molars were significantly intruded (P<0.05), and the average intrusion was 3.30±1.60 mm. The differences between the pre-intrusion and post-intrusion root volumes were statistically significant for all of the roots investigated (P<0.05). The roots were sorted by volume loss in descending order as follows: mesiobuccal, palatal, and distobuccal. Statistical significance was achieved among the three roots. The average total resorption for each tooth was 58.39±1.54 mm³.

CONCLUSION: Volume measurement using CBCT was able to effectively evaluate root resorption caused by mini-screw intrusion. The highest volume loss was observed in the mesiobuccal root among the three roots of the investigated first molar teeth.

Item ID: 28786
Item Type: Article (Research - C1)
ISSN: 1932-6203
Date Deposited: 19 Aug 2013 00:09
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1105 Dentistry > 110506 Orthodontics and Dentofacial Orthopaedics @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920113 Oro-Dental Disorders @ 100%
Downloads: Total: 97
Last 12 Months: 22
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page