Results 211 to 220 of about 3,650 (252)
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Prediction of arch perimeter changes due to orthodontic treatment
American Journal of Orthodontics and Dentofacial Orthopedics, 2002A borderline orthodontic case with mild to moderate space deficiency can be treated without extractions. Expansion can be used to relieve space deficiency. The prediction of arch perimeter change for a given amount of expansion is helpful in planning the treatment of a patient who needs expansion, and it can facilitate nonextraction orthodontic ...
Hassan, Noroozi +3 more
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Maxillary arch perimeter prediction using Ramanujan's equation for the ellipse
American Journal of Orthodontics and Dentofacial Orthopedics, 2015The prediction of arch perimeter gained when expanding the arch or proclining the anterior incisors is particularly important in the decision of tooth extraction vs nonextraction therapy for orthodontic treatment.Correlation of the measured perimeter of the maxillary dental arch and the calculated perimeter applying Ramanujan's equation for the ...
David D, Chung, Richard, Wolfgramm
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The catenometer: A reliable device for estimating dental arch perimeter
American Journal of Orthodontics, 1973C orrect alignment of the teeth is a fundamental goal of orthodontic therapy. Thus, the amount of the discrepancy between the total tooth material (mesiodistal widths) present and the dental arch perimeter available to accommodate the teeth is probably the most critical estimate of any of the orthodontic diagnostic procedures.
D R, Musich, J L, Ackerman
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Conventional Versus Digital Assessment of Dental Arches' Perimeters in Mixed Dentition
Journal of Hunan University Natural Sciences, 2022The advances of digital technologies in dentistry have made significant changes in orthodontic diagnosis and treatment planning. Digital three-dimensional models are commonly used to perform dental arch and teeth measurements through intra-oral scanners and software.
Dunia Ahmed Al-Dulaimy +2 more
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British Journal of Orthodontics, 1996
A mathematically determined technique which seemed to be valid for the calculation of crowding and spacing in arches with acceptable alignment, was tested on a series of arches with varying degrees of crowding and irregularity. Upper and lower study casts of 30 individuals with sufficient malalignment and crowding to warrant orthodontic treatment ...
J M, Battagel, A S, Johal, V P, Crow
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A mathematically determined technique which seemed to be valid for the calculation of crowding and spacing in arches with acceptable alignment, was tested on a series of arches with varying degrees of crowding and irregularity. Upper and lower study casts of 30 individuals with sufficient malalignment and crowding to warrant orthodontic treatment ...
J M, Battagel, A S, Johal, V P, Crow
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Individualized Catenary Curves: Their Relationship to Arch Form and Perimeter
British Journal of Orthodontics, 1996Study casts of the lower arches of 35 children in whom arch alignment was considered acceptable, were examined using a reflex microscope. Arch perimeter was calculated mathematically from a method which required measurement of the mesio-distal widths of the teeth only. This was described as the ‘overlap’ method.
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Tooth diameters and arch perimeters in a black and a white population
American Journal of Orthodontics and Dentofacial Orthopedics, 1991This study was undertaken to test the hypothesis that a sample of black patients will have larger mesiodistal tooth diameters and larger dental arch perimeters than a corresponding sample of white patients. In this study, the black sample's mean canine, first and second premolar, and first molar mesiodistal diameters were significantly larger than ...
M L, Merz +3 more
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Acta Odontologica Scandinavica, 2014
The prime aim of the study was to measure and compare the 3D CBCT Bolton tooth size ratio in relation to the upper and lower arch widths, arch length and arch perimeter.The data source was CBCT high volumetric data from the archives. Tooth size, arch widths, arch length and arch perimeter were measured in maxilla and mandibular arches.
Mohammad Khursheed, Alam +4 more
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The prime aim of the study was to measure and compare the 3D CBCT Bolton tooth size ratio in relation to the upper and lower arch widths, arch length and arch perimeter.The data source was CBCT high volumetric data from the archives. Tooth size, arch widths, arch length and arch perimeter were measured in maxilla and mandibular arches.
Mohammad Khursheed, Alam +4 more
openaire +2 more sources
British Journal of Orthodontics, 1996
A simplified, mathematically determined technique for calculating arch perimeter (the overlap method) is described and its validity in determining an accurate assessment of crowding is tested. Indices, expressed in millimeters of crowding or spacing, were computed for both, the whole arch and the labial segment alone.
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A simplified, mathematically determined technique for calculating arch perimeter (the overlap method) is described and its validity in determining an accurate assessment of crowding is tested. Indices, expressed in millimeters of crowding or spacing, were computed for both, the whole arch and the labial segment alone.
openaire +2 more sources
American Journal of Orthodontics and Dentofacial Orthopedics, 2012
In this prospective longitudinal study, we compared the prevalence of mandibular second molar eruption difficulties in patients treated with appliances to maintain mandibular arch perimeter. Other independent variables (age, molar angulation, space-width ratio, treatment time, and sex) were tested for their value as predictors of eruption difficulty ...
Rebecca Lash, Rubin +2 more
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In this prospective longitudinal study, we compared the prevalence of mandibular second molar eruption difficulties in patients treated with appliances to maintain mandibular arch perimeter. Other independent variables (age, molar angulation, space-width ratio, treatment time, and sex) were tested for their value as predictors of eruption difficulty ...
Rebecca Lash, Rubin +2 more
openaire +2 more sources