The Potential Attachment Area of the Maxillary First Molar

Hermann, Donald W.; Gher, Marlin E.; Dunlap, Robert M.; Pelleu, George B.

doi:10.1902/jop.1983.54.7.431

Cited by 30 publications

(15 citation statements)

References 6 publications

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“…Briefly, the teeth were placed in 3% sodium hypochlorite to remove all soft tissue, and accretions were then carefully removed with an ultrasonic scaler (Hermann et al, 1983;Dunlap and Gher, 1985;Gher and Dunlap, 1985;Lyroudia et al, 2000).…”

Section: Methodsmentioning

confidence: 99%

Quantitative evaluation of the accuracy of micro‐computed tomography in tooth measurement

2005

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Micro-computed tomography (MCT) is a noninvasive technique for visualizing morphological characteristics of teeth in a detailed and accurate manner, without causing any tooth destruction. A large amount of information can be obtained from such scans. The slices can be recreated in any plane, and the data can be represented as either two-dimensional (2D) or three-dimensional (3D) images. In addition, the internal and external anatomy can be demonstrated simultaneously or separately, and the images can be assessed qualitatively and quantitatively. However, only the qualitative accuracy of MCT had been evaluated previously. The aim of the present study was to evaluate the accuracy of MCT quantitatively by comparing the values obtained by MCT with those of other imaging methods. Twelve teeth were scanned using a desktop X-ray micro-CT scanner, and the images were reconstructed and measured. Values obtained by direct measurement served as the primary reference for linear measurements. Measurements made by a 3D scanner and by photography were additional references. MCT was found to be a reliable method of making linear measurements and may be a useful device for measuring distance and for observing both internal and external tooth structure using the reconstructed 3D form.

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Section: Methodsmentioning

confidence: 99%

Quantitative evaluation of the accuracy of micro‐computed tomography in tooth measurement

2005

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“…Root surface area for each 1-mm section was determined by averaging the actual root circumferences of the apical and coronal sides of the section and multiplying by the root length represented by each section (1-mm). 8. Starting with the root sections located at the CEJ and proceeding apically, the RSAs of the corresponding sections from all 20 maxillary first molars were averaged to give a mean RSA for each millimeter of root length.…”

Section: Methodsmentioning

confidence: 99%

“…Hermann et al 8 recently evaluated the surface area of the individual roots and root trunks of 20 maxillary first molars. They reported that the mesiobuccal and palatal roots were essentially equal in mean RSA and that the root trunk represented a surprisingly large portion of the total RSA.…”

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confidence: 99%

Linear Variation of the Root Surface Area of the Maxillary First Molar

Gher¹,

Dunlap

1985

Journal of Periodontology

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The variation of root surface area (RSA) in 1-mm increments from the cementoenamel junction (CEJ) to the apex was determined for the maxillary first molar. Twenty extracted maxillary first molars were cross sectioned every millimeter, and each section was photographed, projected and measured with a calibrated opisometer. The RSA and percentage of RSA were calculated for each 1-mm section. The location of furcation entrances, root separations and roofs of the furcations was also determined. Analysis of the mean measurements demonstrated that (1) the largest per cent of RSAs were found in the furcation area; (2) the mean distance from the CEJ was 3.6 mm for the mesial furcation entrance, 4.2 mm for the facial furcation entrance and 4.8 mm for the distal furcation entrance; (3) the mean distance from the CEJ to the point at which the roots separate from the root trunk was 5.0 mm for the mesiobuccal root and 5.5 mm for the distobuccal root; (4) in 11 of the 20 teeth the roof of the furcation was coronal to all root separations, forming a concave dome between roots. According to the individual and mean measurements, horizontal attachment loss of 6.0 mm or greater would have resulted in Grade III furcation involvement in all the teeth studied.

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“…Moreover, molars have root trunk portion which shows wider surface area than just conical root portion. Root trunk area averaged 32% of the total root surface area of Maxillary first molar and was greater than the root surface area of palatal root 22. On these teeth loss of apical root is less significant for alveolar bone support.…”

Section: Reviewmentioning

confidence: 97%

Does apical root resection in endodontic microsurgery jeopardize the prosthodontic prognosis?

Cho

Kim

2013

Restor Dent Endod

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Apical surgery cuts off the apical root and the crown-to-root ratio becomes unfavorable. Crown-to-root ratio has been applied to periodontally compromised teeth. Apical root resection is a different matter from periodontal bone loss. The purpose of this paper is to review the validity of crown-to-root ratio in the apically resected teeth. Most roots have conical shape and the root surface area of coronal part is wider than apical part of the same length. Therefore loss of alveolar bone support from apical resection is much less than its linear length.The maximum stress from mastication concentrates on the cervical area and the minimum stress was found on the apical 1/3 area. Therefore apical root resection is not so harmful as periodontal bone loss. Osteotomy for apical resection reduces longitudinal width of the buccal bone and increases the risk of endo-perio communication which leads to failure. Endodontic microsurgery is able to realize 0 degree or shallow bevel and precise length of root resection, and minimize the longitudinal width of osteotomy. The crown-to-root ratio is not valid in evaluating the prosthodontic prognosis of the apically resected teeth. Accurate execution of endodontic microsurgery to preserve the buccal bone is essential to avoid endo-perio communication. (Restor Dent Endod 2013;38(2):59-64)

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The Potential Attachment Area of the Maxillary First Molar

Cited by 30 publications

References 6 publications

Quantitative evaluation of the accuracy of micro‐computed tomography in tooth measurement

Quantitative evaluation of the accuracy of micro‐computed tomography in tooth measurement

Linear Variation of the Root Surface Area of the Maxillary First Molar

Does apical root resection in endodontic microsurgery jeopardize the prosthodontic prognosis?

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