Dreidimensionale computertomographische Darstellung des bezahnten Alveolarkamms

Fuhrmann, Robert; Wehrbein, Heinrich; Diedrich, Peter

doi:10.1007/bf02164841

Cited by 27 publications

(8 citation statements)

References 11 publications

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“…Although a high degree of accuracy has been reported in earlier publications [10,14,18,19,22,25] all measurements in the present study were carried out at least twice. Although a high degree of accuracy has been reported in earlier publications [10,14,18,19,22,25] all measurements in the present study were carried out at least twice.…”

Section: Discussionmentioning

confidence: 66%

Evaluation of labio-lingual bony support of lower incisors in orthodontically untreated adults with the help of computed tomography

Nauert

Berg

1999

J Orofac Orthop/Fortschr Kieferorthop

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The aim of the present study was to assess bone volume and bone density in orthodontically untreated adults using a CT analyzing method, with reference data in the clinically essential area of the lower incisors being obtained. For quantitative and qualitative assessment of the labial and lingual bony support of the lower incisors, existing CT-images of 20 adult men with a near-to-normal occlusion and a clinically healthy periodontal situation were evaluated. With the help of a special program (SIM/Plant) and on the basis of axial scans, sagittal scans were constructed, permitting the individual imaging of the lower incisors and their alveolar process. The bony support of each tooth was registered labially and lingually perpendicular to the tooth axis at intervals corresponding to 10% of the root length. At the various root levels, especially at the upper parts of the roots, only small amounts of bony support, if any, were frequently observed. Labially, bony fenestrations and dehiscences were frequently seen, but lingually mostly dehiscences. No clinically relevant association was found between labial bony support and cephalometrically registered inclination of the lower incisors. Bone density, which was registered in Hounsfield units at the gingival, middle and apical thirds of the root levels, increased from the gingival to the apical thirds of the roots, generally with lower lingual than labial values. Before initiating orthodontic treatment a thorough clinical assessment of the anatomical situation in the lower incisor segment should be carried out. At present bone volume in this area can be reliably assessed only with computed tomography; however, this has to be weighed up against increased radiation risks. Therefore, the form of the symphysis should initially be roughly assessed by means of conventional cephalometry, with additional CT-based analysis of individual teeth being confined to special indications.

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Section: Discussionmentioning

confidence: 66%

Evaluation of labio-lingual bony support of lower incisors in orthodontically untreated adults with the help of computed tomography

Nauert

Berg

1999

J Orofac Orthop/Fortschr Kieferorthop

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“…In the literature, data about the accuracy of computed tomography has been described by several authors. Solar et al (2000) [12] reported an accuracy of -0.53 -0.45 mm, Fuhrmann et al (1993) [16] reported an accuracy of 0.3 -0.5 mm, and Lindh 1995 [13] an accuracy of 0.1 -1.3 mm. However, these investigators concentrated [17] concluded that the average deviation was 0.1-0.3 mm, and a dose reduction of 75% had no effect on the results.…”

Section: Ctmentioning

confidence: 99%

High-resolution CT of transplanted teeth: imaging technique and measurement accuracy

et al. 2008

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The aim of this study was to determine the accuracy of crown diameter measurements by dental CT as a tool for preoperative diagnosis before tooth transplantations. Fifty-eight patients underwent clinically indicated dental CT. The diameter of the crowns were measured by CT using a standard protocol (1.5-mm slice thickness, 1-mm table feed, 120 kV, 25-75 mA/s, 2-s scan time/slice, 512 matrix) and a standard dental software package. Postoperatively, the same distances were clinically measured using a sliding gauge. The degree of the deviation between CT measurements and clinical measurements was in the sub-millimeter range. According to the regression analysis, the correlation coefficient equals 0.98 and 0.97, indicating a strong relationship between the CT and the manual measurement of the crown diameter in the bucco-lingual and the mesio-distal direction. The mean deviation of CT measurements with regard to the bucco-lingual diameter of the crown was +0.08 mm (SD: +/-0.38 mm). For the mesio-distal diameter, the mean deviation of CT measurements was -0.24 mm (SD: +/-0.53 mm). These results demonstrate that dental CT promises to be a valuable tool for the evaluation of the potential and optimal size and site for tooth transplantations.

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“…[5] tiber die nachweisliche InterpretationsmSglichkeit der Umgebungsstrukturen yon Wurzeln im CT, hat diese Untersuchung zum Ziel, die bestehenden dentoalveol~en Verh~iltnisse der vier Unterkieferinzisiviwurzeln in FRS und CT darzustellen. Ist eine topographische Beurteilung anhand des FRS m6glich?…”

Section: Literaturiiberblickunclassified

Die Schneidezahnwurzel in der Unterkiefersymphyse im Computertomogramm und in der Fernröntgenseitenaufnahme

Freisfeld

Drescher

Schüller

1995

Fortschritte der Kieferorthopädie

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On the basis of lateral cephalograms and computer tomograms (CT) the position of the incisor roots and the bone structure surrounding them were studied. Nine patients each had an axial CT of the mandibular symphysis area and, in addition, 6 of these patients had lateral cephalograms. In order to compare both images, we defined a classification scheme as follows: Class 1 = the incisor roots are projected into the midst of the oral corticalis of the symphysis; class 2 = the roots are in contact with the oral corticalis; class 3 = the incisor roots are at a distance to the oral corticalis. The results from the 2 types of visualization were then compared. When looking at the bone structures surrounding the incisor roots, the lateral cephalograms failed to yield an exact differentiation. Such details can be best examined in the axial CT layers, because in the lateral cephalogram the 4 incisor roots are over projected to 1 root. The space for movement of the incisors is narrow. The root of each and every patient showed a different position in oro-buccal direction. This fact must be taken into consideration in clinical practice, especially when employing fixed appliances with 3-dimensional root control.

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Dreidimensionale computertomographische Darstellung des bezahnten Alveolarkamms

Cited by 27 publications

References 11 publications

Evaluation of labio-lingual bony support of lower incisors in orthodontically untreated adults with the help of computed tomography

Evaluation of labio-lingual bony support of lower incisors in orthodontically untreated adults with the help of computed tomography

High-resolution CT of transplanted teeth: imaging technique and measurement accuracy

Die Schneidezahnwurzel in der Unterkiefersymphyse im Computertomogramm und in der Fernröntgenseitenaufnahme

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