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使用锥形束计算机断层扫描图像评估上颌骨后部微螺钉的角度

Evaluation of miniscrew angulation in the posterior maxilla using cone-beam computed tomographic image.

作者信息

Villela Henrique M, Vedovello Filho Mario, Valdrighi Heloísa C, Santamaria-Jr Milton, Menezes Carolina Carmo de, Vedovello Silvia A S

机构信息

Programa de Pós-graduação em Ortodontia, Fundação Hermínio Ometto, Uniararas, Araras, SP, Brazil.

出版信息

Dental Press J Orthod. 2018 Jan;23(1):46-55. doi: 10.1590/2177-6709.23.1.046-053.oar.

DOI:10.1590/2177-6709.23.1.046-053.oar
PMID:29791691
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5962247/
Abstract

OBJECTIVE

This study aimed at evaluating whether changes in the insertion angle is a determining factor in the positioning of the miniscrews body in a region with larger interradicular space in the posterior maxilla.

METHODS

Analysis of 60 posterior maxillary quadrants were made using images obtained by means of cone-beam computed tomographic image (CBCT), with 0.076-mm voxel, which presented a real miniscrew inserted in the mesial region of the maxillary first molars, serving as reference point for the placement of the virtual miniscrews. Measurements of the distances between roots were made in three points on the body of the virtual miniscrews (A, B and C), at four different angulations, 70o, 60o, 50o and 40o (T1 to T4), in relation to the long axis of the second premolar. This evaluation was made in four groups, selected in accordance with the disposition of the roots of the second premolars and first molars: Group 1 (all types of roots), Group 2 (convergent roots), Group 3 (divergent roots) and Group 4 (parallel roots).

RESULTS

There were no statistically significant differences in the measurements of points A, B and C, at the different angles (70o, 60o, 50o and 40o) and in the different groups (p > 0.05).

CONCLUSIONS

Changes in the insertion angle is not a determinant factor in the positioning of miniscrews body in regions with larger interradicular space in posterior maxilla.

摘要

目的

本研究旨在评估在上颌后牙区根间间隙较大的区域，植入角度的变化是否是微型螺钉体定位的决定因素。

方法

使用锥形束计算机断层扫描图像（CBCT）获得的图像对60个上颌后牙象限进行分析，体素为0.076毫米，其中有一个实际的微型螺钉植入上颌第一磨牙的近中区域，作为虚拟微型螺钉放置的参考点。在虚拟微型螺钉体的三个点（A、B和C）上，相对于第二前磨牙的长轴，在四个不同角度（70°、60°、50°和40°，即T1至T4）测量牙根之间的距离。根据第二前磨牙和第一磨牙牙根的排列情况分为四组进行评估：第1组（所有牙根类型）、第2组（汇聚牙根）、第3组（发散牙根）和第4组（平行牙根）。

结果

在不同角度（70°、60°、50°和40°）和不同组中，A、B和C点的测量值无统计学显著差异（p>0.05）。

结论

在上颌后牙区根间间隙较大的区域，植入角度的变化不是微型螺钉体定位的决定因素。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/184c9e4590fb/2176-9451-dpjo-23-01-00046-gf6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/1634018dbb34/2176-9451-dpjo-23-01-00046-gf1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/dc682977c979/2176-9451-dpjo-23-01-00046-gf2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/05b973eb016e/2176-9451-dpjo-23-01-00046-gf3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/3de153dae0ad/2176-9451-dpjo-23-01-00046-gf4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/ce569d6b634b/2176-9451-dpjo-23-01-00046-gf5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/184c9e4590fb/2176-9451-dpjo-23-01-00046-gf6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/1634018dbb34/2176-9451-dpjo-23-01-00046-gf1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/dc682977c979/2176-9451-dpjo-23-01-00046-gf2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/05b973eb016e/2176-9451-dpjo-23-01-00046-gf3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/3de153dae0ad/2176-9451-dpjo-23-01-00046-gf4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/ce569d6b634b/2176-9451-dpjo-23-01-00046-gf5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3c40/5962247/184c9e4590fb/2176-9451-dpjo-23-01-00046-gf6.jpg

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