Die Schädigung bleibender Zähne durch verlagerte obere Eckzähne

Schüller, Heinrich; Freisfeld, M

doi:10.1055/s-2008-1032980

Cited by 6 publications

(4 citation statements)

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“…Das Ausmag der Projektion des verlagerten Eckzahns tiber eine Schneidezahnwurzel korreliert nicht mit einer Resorptionslakune an der Schneidezahnwurzel [7,14,18]. Das Ausmag der Projektion des verlagerten Eckzahns tiber eine Schneidezahnwurzel korreliert nicht mit einer Resorptionslakune an der Schneidezahnwurzel [7,14,18].…”

Section: Discussionunclassified

“…Documentation was conducted with a window width of 4000 HU and a center of 800 HU [ 18]. The examinations were performed with a Tomoscan 350 HS (Philips) with the patients in a supine position.…”

Section: Freisfeld M Et Al Upper Canines In P1 and Ct Radiographic Tmentioning

confidence: 99%

“…Resorptions on the palatal aspect of the incisor roots are reliably identifiable only on transversal CT scans [1,5,7,8,18]. Ericson et al [7] have demonstrated the informative value of polytomography in detecting resorptions induced by displaced canines.…”

Section: Freisfeld M Et Al Upper Canines In P1 and Ctmentioning

confidence: 99%

“…Palatinal gelegene Resorptionen an Schneidezahnwurzeln k/3nnen sicher nur mit transversalen Schnittbildern eines CT nachgewiesen werden [1,5,7,8,18]. Ericson 14, 18].…”

Section: Freisfeld M Et Al Upper Canines In P1 and Ctunclassified

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X-ray diagnosis of impacted upper canines in panoramic radiographs and computed tomographs

Freisfeld

Dahl

Jäger

et al. 1999

J Orofac Orthop/Fortschr Kieferorthop

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Ten orthodontists were asked to diagnose the number of impacted upper canines and the number of resorbed lateral and/or central incisor roots in 30 panoramic radiographs (P1) from 30 patients. In order to objectify these diagnoses, transversal CT images of all 30 patients were examined in addition. Addition of the recordings in the 30 patients revealed that the 10 orthodontists had diagnosed 350 impacted/displaced canines. On comparison of the P1 and CT results, the latter revealed that, in fact, 390 canines were impacted or displaced, not just 350. Addition of the recordings further showed that, based on P1, the investigators had diagnosed 73 resorptions in the 1,200 incisors examined. However, the CT showed 160 resorptions; this corresponds to a sensitivity value of 45.6%. The CT showed 1,040 incisors with no resorptions, whereas the investigators diagnosed only 925 teeth as not resorbed in the P1. The specificity was thus 88.9%. These results show that, due to their low reliability, panoramic radiographs are not an appropriate means of diagnosing resorptions in front teeth in connection with impacted canines.

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Section: Discussionunclassified

Section: Freisfeld M Et Al Upper Canines In P1 and Ct Radiographic Tmentioning

confidence: 99%

Section: Freisfeld M Et Al Upper Canines In P1 and Ctmentioning

confidence: 99%

“…Palatinal gelegene Resorptionen an Schneidezahnwurzeln k/3nnen sicher nur mit transversalen Schnittbildern eines CT nachgewiesen werden [1,5,7,8,18]. Ericson 14, 18].…”

Section: Freisfeld M Et Al Upper Canines In P1 and Ctunclassified

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X-ray diagnosis of impacted upper canines in panoramic radiographs and computed tomographs

Freisfeld

Dahl

Jäger

et al. 1999

J Orofac Orthop/Fortschr Kieferorthop

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Assessment of the space for the lower wisdom teeth

Freisfeld

Drescher

Kobe

et al. 1998

J Orofac Orthop/Fortschr Kieferorthop

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From 13 patients a computed tomograph (CT-scan) and a panoramic radiograph (Orthophos, program 1, P1) were examined with respect to the spatial conditions of the lower wisdom teeth. In the panoramic radiograph the available space for the third molars of the lower jaw was determined by calculating the ratio (Q) of 2 distances: the mesiodistal crown diameter and the retromolar space. In the axial CT 3 different positions of the third molar were distinguished: third molar located anterior to the ramus mandibulae = sufficient space, partially within the ramus = restricted space, totally within the ramus = deficient space. These positions were compared with the findings in the panoramic radiograph, firstly in relation to the ramus and secondly in relation to a line (L) perpendicular to the occlusal plane at the intersection of the anterior border of the ramus and the crista temporalis. Furthermore, the mesial rotation of the third molar was measured and the relation of the bony structures surrounding the teeth were described. Comparison of the CT results with the quotients of the P1 showed that, for those wisdom teeth molars with an available space above 50% to under 100%, any of the 3 CT gradings was found. Assessing the projection of the ramus over the third molar as seen in the P1, 60% of the P1- and CT-results corresponded. The relation between the line L and the third molar showed coincidence in 76% of all cases. These results and the mesial rotation of the wisdom teeth as well as their different relation to the bony environment are possibly important factors concerning their eruption prognosis. The three-dimensional CT-scan gives new possibilities for further investigations of third-molar problems.

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Dreidimensionale computertomographische Darstellung des bezahnten Alveolarkamms

Fuhrmann

Wehrbein

Diedrich

1993

Fortschritte der Kieferorthopädie

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Human bone segments of the toothed jaw with ten upper and ten lower teeth were scanned by high resolution computer tomography in continuous parallel axial and coronal slices (Somaton plus, Siemens). In both directions scanning was performed to 1 mm and 2 mm thicknesses and at 1 mm and 2 mm intervals. The jaw segments were dissected analogously in 1 mm thick slices. Contact films of the corresponding bone segments were exposed and then histological thin sections prepared. The statistical comparison between the CT exposures, the contact films, and the histological sections revealed an average absolute deviation of 0.3 to 0.5 mm with the axial CT exposures and a deviation of 0.3 to 1.6 mm with the coronal sections. It was possible to interpret in a quantitatively detailed manner the teeth and surrounding bone compacta up to a 0.5 mm minimum bone thickness. Computer-enhanced secondary reconstructions made possible an additional qualitative interpretation of the bone upper surface and the freely definable planes. Continuous parallel axial CT slices enable an interference-free, proportionally accurate representation of the apical base, the periodontal bone structure, and the radice-root topography.

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Die Schädigung bleibender Zähne durch verlagerte obere Eckzähne

Cited by 6 publications

References 0 publications

X-ray diagnosis of impacted upper canines in panoramic radiographs and computed tomographs

X-ray diagnosis of impacted upper canines in panoramic radiographs and computed tomographs

Assessment of the space for the lower wisdom teeth

Dreidimensionale computertomographische Darstellung des bezahnten Alveolarkamms

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