搜索结果: 61-75 共查到“知识库 口腔影像诊断学”相关记录171条 . 查询时间(2.437 秒)
光学相干断层成像术对人牙窝沟釉质早期龋变深度的测量
光学相干断层成像技术 偏光显微镜 龋病诊断 牙合面龋
2014/3/13
探讨光学相干断层成像技术（OCT）检测离体牙面窝沟釉质早期人工龋变深度的准确性和可行性。方法将7 颗因正畸治疗需要拔除的人前磨牙随机分成脱矿及脱矿-再矿化2 组，面开窗3 mm×4 mm。将脱矿组放入脱矿液中制备人工脱矿模型；将脱矿-再矿化组交替放入脱矿液和再矿化液制备人工龋模型。分别对上述2 组牙齿样本进行OCT 扫描，测得龋变深度；在牙齿样本OCT 扫描的相应部位制备磨片，测量偏光显微镜下...
一个单纯性先天缺牙家系的临床及基因突变分析
单纯性多数牙先天缺失 成对盒基因 肌节同源盒基因 突变
2010/8/18
目的探讨多数牙先天缺失患者的人类成对盒基因（PAX9）和肌节同源盒基因（MSX1）突变位点，为该疾病的病因学研究提供依据。方法对于该例患者与部分正常家庭成员进行口内检查及家系调查，取研究模型测量其牙冠宽度，并与正常值比较。拍摄曲面断层片和头颅侧位片进行头影测量分析，对比颅面形态和错畸形类型及特点。从静脉血中提取DNA，根据PAX9和MSX1的全序列设计引物，采用聚合酶链式反应（PCR）扩增PAX...
一旦发生根折则预后非常差。根折与牙齿的解剖形态、因素、生物力学、医源性等因素密切相关。国内外学者对根折原因进行了大量的研究。本文对根折病因及发生机制、诊断和治疗进行综述，为临床治疗提供一定参考。
基于螺旋CT影像的计算机辅助定位阻生牙的临床应用研究
计算机辅助 阻生牙 定位
2010/8/31
目的探讨计算机辅助技术定位埋伏阻生牙的临床应用价值。方法利用螺旋CT对35例颌骨埋伏阻生牙患者进行颌骨扫描，将DICOM数据输入Simplant软件，通过对颌骨数据后处理定位埋伏阻生牙。结果通过Simplant软件的处理，埋伏阻生牙的三维形态、生长方向、颊舌向和近远中向的位置以及与邻牙和周围解剖结构的关系均得到了清晰显示。结论计算机辅助技术可以精确定位埋伏阻生牙，为制定临床治疗方案提供依据。
CT-based analysis of malignant tumor volume and localization: a preliminary study
Tomography Wounds and injuries Image processing Face Neoplasms
2009/10/20
The purpose of this study was to correlate 3D-CT (3D computed tomography) volume measurements of malignant tumors with the response to treatment, and to observe bone invasion in these lesions applying...
Radiographic evaluation of cervical spine of subjects with temporomandibular joint internal disorder
Temporomandibular joint disorders Spinal column Radiography Posture
2009/10/20
Although the etiopathophysiology of internal temporomandibular joint internal disorders (TMJ ID) is still unknown, it has been suggested that head and body posture could be related to its initial onse...
Tomographic evaluation of TMJ in adolescents with temporomandibular disorders
Tomography Temporomandibular joint disorders Teen health
2009/10/20
This study evaluated the TMJ images of normal subjects and of those who presented TMD (temporomandibular disorders) using linear tomography at rest position. Craniomandibular Index (CMI) and a questio...
Correlation between visual and radiographic examinations of non-cavitated occlusal caries lesions: an in vivo study
Dental caries Dental occlusion Radiography bitewing
2009/10/20
The aim of this study was to conduct an in vivo investigation of the correlation between the visual and radiographic scoring systems by Ekstrand et al.7 (1997) for the diagnosis of occlusal caries les...
Computed tomography assessment of Apert syndrome
Tomography X-ray computed Skull Acrocephalosyndactylia
2009/10/20
Apert syndrome, or acrocephalosyndactyly type I, is a craniofacial dysostosis, an autosomal dominant condition characterized by severe developmental disturbances of the craniofacial region including b...
Comparison among dental,skeletal and chronological development in HIV-positive children:a radiographic study
Age determination by skeleton Age determination by teeth HIV Acquired immunodeficiency syndrome
2009/10/20
The goal of this study was to evaluate skeletal, dental and chronological development in an HIV-positive group of children, as compared with a control group, during a four-year period. Panoramic radio...
Assessment of disk displacements of the temporomandibular joint
Temporomandibular joint Magnetic resonance imaging Temporomandibular joint disk
2009/10/19
The aim of the present research was to evaluate disk displacements (DDs) of the temporomandibular joint (TMJ) among patients referred for magnetic resonance imaging (MRI) scans, and analyze the type a...
CT interpretation of craniofacial anomalies: a comparative analysis by undergraduate dental students
Tomography Face Craniosynostosis Craniofacial abnormalities
2009/10/19
The aim of this study was to evaluate the accuracy and reproducibility of computed tomography (CT) image interpretation made in axial slices (2D-CT) and 3D reconstructed images (3D-CT) of patients wit...
Length determination of zygomatic implants using tridimensional computed tomography
Atrophy Dental implantation Maxilla Tomography X-ray computed
2009/10/19
Considering the potential of tridimensional computed tomography (3D-CT) as a predictor of real bone dimensions, nine dried human skulls with maxillary edentulism were evaluated using images obtained b...
Densitometric analysis of the autogenous demineralized dentin matrix on the dental socket wound healing process in humans
Bone regeneration Dentin Tissue engineering
2009/10/19
The aim of this study was to evaluate the effects of the autogenous demineralized dentin matrix (ADDM) on the third molar socket wound healing process in humans, using the guided bone regeneration tec...
Reproducibility of pixel values for two photostimulable phosphor plates in consecutive standardized scannings
Radiography dental digital Reproducibility of results
2009/10/19
The objective of the present study was to determine the reproducibility of the pixel values obtained with the Digora system (Soredex, Finland). Exposures were standardized, with variation in exposure ...