American journal of orthodontics最新文献_第6页

Roentgen stereophotogrammetry for analysis of cranial growth 用于颅骨生长分析的伦线立体摄影测量

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90054-0

Göran Selvik M.D., Per Alberius D.D.S. M.D., Michael Fahiman M.Sc.

{"title":"Roentgen stereophotogrammetry for analysis of cranial growth","authors":"Göran Selvik M.D., Per Alberius D.D.S. M.D., Michael Fahiman M.Sc.","doi":"10.1016/0002-9416(86)90054-0","DOIUrl":"10.1016/0002-9416(86)90054-0","url":null,"abstract":"<div><p>A system of roentgen stereophotogrammetric analysis (FISA) has been developed and its value in studies of cranial growth in both man and the experimental animal (rabbit) has been delineated. This method is based on measurements from metal bone marker images on roentgenograms. Two roentgen tubes simultaneously expose the object, which is placed in one of two types of calibration cages. The object position does not need to be identical from one examination to the next. The cage, holding indicators of predetermined internal positions (in two or four planes), defines a laboratory coordinate system. Two-dimensional image coordinates are obtained by means of a highly accurate cartographic instrument. By computer reconstruction of the x-ray beams through the markers, 3-D object coordinates are calculated. For subsequent analysis of growth processes, extensive software is necessary. To control intrasegmental stability (routinely performed at each examination), a minimum of two markers is required, whereas three markers are needed in each skeletal segment for kinematic analysis using the rigid-body concept. Careful planning of marker placement before implantation minimizes implant loss and instability that otherwise might be a problem. Complications other than bone marker loosening have been nonexistent. The technical accuracy is high. Consequently, roentgen stereophotogrammetry, with the aid of metallic implants, is a superior means to obtain biometric information on cranial growth with relative ease.</p></div>","PeriodicalId":75476,"journal":{"name":"American journal of orthodontics","volume":"89 4","pages":"Pages 315-325"},"PeriodicalIF":0.0,"publicationDate":"1986-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-9416(86)90054-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14580317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Mandibular growth direction following adenoidectomy 腺样体切除术后下颌生长方向

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90049-7

S. Linder-Aronson , D.G. Woodside , A. Lundströ

{"title":"Mandibular growth direction following adenoidectomy","authors":"S. Linder-Aronson , D.G. Woodside , A. Lundströ","doi":"10.1016/0002-9416(86)90049-7","DOIUrl":"10.1016/0002-9416(86)90049-7","url":null,"abstract":"<div><p>The purpose of this article is to test the hypothesis that the establishment of nasal respiration in children with severe nasopharyngeal obstruction can be eliminated as a factor in determining mandibular growth direction. The article describes the changes in mandibular growth direction (MGD) in a 5-year period after adenoidectomies and the establishment of nasal breathing in a population of Swedish children. Measurements of mandibular growth directions were obtained from serial cephalometric radiographs after adenoidectomies in 38 Swedish children aged 7 to 12 years with previous nasopharyngeal obstructions. These were compared with the growth directions in a control sample of 37 Swedish children with clear airways and matched for age and sex. The adenoidectomy sample initially showed significantly longer lower face heights, steeper mandibular plane angles, and more retrognathic mandibles than the matched controls. Analysis showed that during the 5 years after adenoidectomies, the girls had a more horizontal MGD (<em>P</em> < 0.02) than did the female controls. A corresponding but not significant trend was found for the boys. The individual growth directions that were obtained following adenoidectomies were more variable than those found in the controls.</p></div>","PeriodicalId":75476,"journal":{"name":"American journal of orthodontics","volume":"89 4","pages":"Pages 273-284"},"PeriodicalIF":0.0,"publicationDate":"1986-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-9416(86)90049-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14638084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 176

A method for retaining open bite cases 一种保留开口咬伤病例的方法

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90057-6

Robert Yudelson D.D.S.

引用次数: 0

Toothbrush resistance and fluoride retention of sound, etched, fluoridated, and remineralized bovine enamel 牙釉质、蚀刻、加氟和再矿化的牛牙釉质的抗牙刷性和氟潴留

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90051-5

J.W.P. Valk, P.P.E. Duijsters, C.L. Davidson

引用次数: 2

In memoriam Lindsey Taylor (1927–1985) 纪念林赛·泰勒(1927-1985)

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90063-1

Philip J. Corbin D.D.S.

引用次数: 0

Studies on immunologic and inflammatory factors in saliva and gingiva in patients with asthma 哮喘患者唾液和牙龈免疫及炎症因子的研究

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90065-5

Tom Zwemer

引用次数: 0

The surgical exposure and application of direct traction of unerupted teeth 未出牙直接牵引的手术暴露与应用

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90056-4

Fraser McDonald B.D.S. F.D.S.R.C.S., Wei Luen Yap B.D.S. F.D.S.R.C.S.

引用次数: 118

American board of orthodontics 美国正畸委员会

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90061-8

引用次数: 0

The morphology of the potential Class III skeletal pattern in the growing child 发育中的儿童潜在的III类骨骼形态

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90052-7

S. Williams, C.E. Andersen Aarhus

{"title":"The morphology of the potential Class III skeletal pattern in the growing child","authors":"S. Williams, C.E. Andersen Aarhus","doi":"10.1016/0002-9416(86)90052-7","DOIUrl":"10.1016/0002-9416(86)90052-7","url":null,"abstract":"<div><p>The aim of the present article was to identify morphologic characteristics in the craniofacial skeleton of the 11-year-old child that could indicate potential development of a Class III skeletal pattern. A radiographic material consisting of 24 children (13 girls, 11 boys) at an average age of 11 years 0 months, who in adulthood demonstrated a Class III skeletal pattern, was compared with a control group of 33 children (16 boys, 17 girls, average age 11 years 6 months) chosen retrospectively on the basis of Class I occlusion. The analysis was performed by means of both linear and angular variables and results are reported both as group means and individual analyses. No one morphologic trait indicative of potential Class III development could be isolated because the study clearly demonstrated the existence of different skeletal combinations. The development of the maxilla, both in size and position, was clearly demonstrated by the linear analysis to be an etiologic factor in Class III development. However, maxillary retrognathism was usually masked in the angular analysis because a reduction in length of the anterior base with subsequent effect on the position of point nasion was often seen in these cases. Mandibular prognathism was a frequent observation, although a true macrognathia was uncommon. In the majority of cases, mandibular prognathism was the result of an increase in the ratio between mandibular length and dorsal position of the glenoid fossa (articulare). The relative merits of angular and linear analyses are discussed in relation to the results presented.</p></div>","PeriodicalId":75476,"journal":{"name":"American journal of orthodontics","volume":"89 4","pages":"Pages 302-311"},"PeriodicalIF":0.0,"publicationDate":"1986-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-9416(86)90052-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14580316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 121

Malocclusion associated with temporomandibular joint changes in young adults at autopsy 年轻人尸检中与颞下颌关节改变相关的错颌合

American journal of orthodontics Pub Date : 1986-04-01 DOI: 10.1016/0002-9416(86)90055-2

W.K. Solberg D.D.S. M.S.D. , C.A. Bibb Ph.D.D.D.S. , B.B. Nordström , T.L. Hansson L.D.S.Odont. Dr.

{"title":"Malocclusion associated with temporomandibular joint changes in young adults at autopsy","authors":"W.K. Solberg D.D.S. M.S.D. , C.A. Bibb Ph.D.D.D.S. , B.B. Nordström , T.L. Hansson L.D.S.Odont. Dr.","doi":"10.1016/0002-9416(86)90055-2","DOIUrl":"10.1016/0002-9416(86)90055-2","url":null,"abstract":"<div><p>The purpose of this study was to identify variables of malocclusion that might be associated with previously reported temporomandibular joint morphologic findings. Before removing the left TMJ from each of 96 cadavers (age <span><math><mtext>x</mtext><mtext> = 26.4 ± 6.8 years</mtext></math></span>), an intraoral examination was performed. Angle classification, crossbite, overbite, and overjet were evaluated. These parameters were analyzed with respect to their association with the following TMJ features: overall shape of the condyle and temporal bone, gross and histologic evidence of remodeling, and position of the articular disk. When combined with age, Angle Class II and III dentitions were associated with temporal and condylar deviation in form (DIF) (<em>P</em> < 0.05) and more Class II dentitions were accompanied by histologic evidence of remodeling changes in the TMJs. Crossbite was associated with increasing presence of DIF in all components (<em>P</em> < 0.01). Anterior crossbite was associated with DIF on the articular eminence (<em>P</em> < 0.01). Deep overbite was more common in persons with flat condyles, open mandibular fossae, and anterior extension of the temporal articular surfaces (<em>P</em> < 0.05). Abnormal overjet was more evident in those with DIF in the disk (<em>P</em> < 0.05); greater overjet was associated with disk displacement (<em>P</em> < 0.05). Considered together, abnormal overbite and overjet were associated with more extensive DIF on the condyle (<em>P</em> < 0.05). In conclusion, malocclusion was associated with morphologic changes in the TMJ, particularly when combined with age. This evidence supports the belief that longer exposure to malocclusion may be associated with more extensive TMJ changes.</p></div>","PeriodicalId":75476,"journal":{"name":"American journal of orthodontics","volume":"89 4","pages":"Pages 326-330"},"PeriodicalIF":0.0,"publicationDate":"1986-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0002-9416(86)90055-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"14580318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 103