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A methodological study of errors in vertical measurements of edentulous ridge height on orthopantomographic radiograms

Identifieur interne : 00DE33 ( Main/Exploration ); précédent : 00DE32; suivant : 00DE34

A methodological study of errors in vertical measurements of edentulous ridge height on orthopantomographic radiograms

Auteurs : Tore Ramstad [Norvège] ; Odd Hensten-Pettersen [Norvège] ; Erik Mohn [Norvège] ; Samira I. Ibrahim [Norvège]

Source :

RBID : ISTEX:C7ABB5650DB7C22F2720960F45A53BD8B1B48234

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English descriptors

Abstract

The purpose of this methodological investigation was to study the relative magnitude of the various errors in vertical ridge measurements from orthopantomograms of edentulous patients. The study was divided into two parts, Part I and Part II. Part I included eleven patients. Two standard orthopantomograms were taken of each patient. Part II included five of the eleven patients in Part I. Here, a third X‐ray taken with the mouth open was added to the X‐rays from Part I. The X‐rays were traced by three dentists. Twelve vertical measurements in the maxilla and in the mandible were made. The variance produced by the patients (morphological variance) and those produced by the dentist, the X‐ray, the interaction patient‐dentist, the interaction dentist‐X‐ray and the random variance (methodological variances) were separately estimated on the basis of a three‐way mixed analysis of variance model. In Part I, on the average, the sum of the methodological variances constituted 1·7 % and 2·5 % of the total variance in the maxilla and in the mandible respectively. The X‐ray produced the greatest single variance component, averaging 1·1 % in both jaws. Although generally statistically significant, the remaining methodological variances were of low magnitude. The interaction patient‐dentist, however, was not significant in most cases. In Part II, on the average, the sum of the methodological variances increased to 38·8 % in the maxilla and 4·6 % in the mandible, mainly caused by an increase in the variance produced by the X‐ray.

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DOI: 10.1111/j.1365-2842.1978.tb01259.x


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Le document en format XML

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<term>Aged</term>
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<term>Alveolar Process (pathology)</term>
<term>Analysis of Variance</term>
<term>Angle orthodontist</term>
<term>Articular eminences</term>
<term>Bony alveolar ridge</term>
<term>Cephalometry</term>
<term>Dental Occlusion, Centric</term>
<term>Edentulous patients</term>
<term>Focus layer</term>
<term>Head position</term>
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<term>Langland sippy</term>
<term>Longitudinal studies</term>
<term>Lower halves</term>
<term>Lowest value</term>
<term>Machine error</term>
<term>Mandible</term>
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<term>Mandibular measurements</term>
<term>Mandibular midline marker</term>
<term>Mandibular midlines</term>
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<term>Maxillary</term>
<term>Maxillary measurements</term>
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<term>Methodological errors</term>
<term>Methodological variances</term>
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<term>Midline markers</term>
<term>Morphological variance</term>
<term>Mouth, Edentulous (diagnostic imaging)</term>
<term>Mouth, Edentulous (pathology)</term>
<term>Mucous membrane</term>
<term>Ofthe</term>
<term>Oral medicine</term>
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<term>Prosthetic dentistry</term>
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<term>Reference points</term>
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<term>Adulte d'âge moyen</term>
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<term>Bouche édentée (anatomopathologie)</term>
<term>Bouche édentée (imagerie diagnostique)</term>
<term>Céphalométrie</term>
<term>Humains</term>
<term>Occlusion dentaire centrée</term>
<term>Plan de recherche</term>
<term>Processus alvéolaire (anatomopathologie)</term>
<term>Processus alvéolaire (imagerie diagnostique)</term>
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<term>Processus alvéolaire</term>
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<term>Processus alvéolaire</term>
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<term>Additional problems</term>
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<term>Aged</term>
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<term>Articular eminences</term>
<term>Bony alveolar ridge</term>
<term>Cephalometry</term>
<term>Dental Occlusion, Centric</term>
<term>Edentulous patients</term>
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<term>Lower halves</term>
<term>Lowest value</term>
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<front>
<div type="abstract" xml:lang="en">The purpose of this methodological investigation was to study the relative magnitude of the various errors in vertical ridge measurements from orthopantomograms of edentulous patients. The study was divided into two parts, Part I and Part II. Part I included eleven patients. Two standard orthopantomograms were taken of each patient. Part II included five of the eleven patients in Part I. Here, a third X‐ray taken with the mouth open was added to the X‐rays from Part I. The X‐rays were traced by three dentists. Twelve vertical measurements in the maxilla and in the mandible were made. The variance produced by the patients (morphological variance) and those produced by the dentist, the X‐ray, the interaction patient‐dentist, the interaction dentist‐X‐ray and the random variance (methodological variances) were separately estimated on the basis of a three‐way mixed analysis of variance model. In Part I, on the average, the sum of the methodological variances constituted 1·7 % and 2·5 % of the total variance in the maxilla and in the mandible respectively. The X‐ray produced the greatest single variance component, averaging 1·1 % in both jaws. Although generally statistically significant, the remaining methodological variances were of low magnitude. The interaction patient‐dentist, however, was not significant in most cases. In Part II, on the average, the sum of the methodological variances increased to 38·8 % in the maxilla and 4·6 % in the mandible, mainly caused by an increase in the variance produced by the X‐ray.</div>
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