Dentistry – Orthodontics – Means to transmit or apply force to tooth
Reexamination Certificate
2000-05-25
2001-08-21
Lucchesi, Nicholas D. (Department: 3732)
Dentistry
Orthodontics
Means to transmit or apply force to tooth
C433S072000
Reexamination Certificate
active
06276932
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an arch wire corresponding to a curve of an occlusal surface of a dental arch and a spherical plate for preparing the arch wire. More particularly, it relates to a Monson spherical plate for preparing an arch wire afforded with a Monson curve for bending and shaping used for preventing collapsing of the curve of Spee of a dental arch of each patient receiving corrective full-band treatment. The present invention also relates to an arch wire prepared using such a spherical plate, a method for preparing the arch wire and, more broadly, to a corrective treatment of a dental arch.
BACKGROUND OF THE INVENTION
In the conventional corrective full-band treatment, an arch wire was prepared by warping a wire along a dental arch in a plan view, placing emphasis only on aesthetic aspects, with respective teeth being arrayed flatly in an elevational view.
SUMMARY OF THE DISCLOSURE
There is much to be desired in the art and the following problems have been encountered during the investigations toward the present invention.
In such treatment, since the respective teeth are arrayed flatly in the elevational view, there is presented a problem that manifestation of the Christensen phenomenon, impeded motion of muscles around the jaws, or an excess pressure is apt to be applied to the teeth due to flattening of the curve of occlusion.
In view of the above-mentioned problems of the related art, it is an object of the present invention to provide a Monson spherical plate having drawn thereon an arch chart for preparing an arch wire whereby it is possible to prevent the Christensen phenomenon, assure a smooth motion of muscles around the jaws and to prevent the curve (surface) of occlusion from being changed.
In another aspect, it is an object of the present invention to provide an arch wire having a curvature corresponding to the curved surface of occlusion and a method for preparing same.
For accomplishing the above object, the present invention provides, in its first aspect, a Monson spherical plate on which are drawn a dental arch curve, scales and an arch reference line usable for preparing an arch wire.
In the present invention, the “Monson spherical plate” means a substantially spherically shaped plate member having a substantially spherical surface (or a portion of the spherical surface) corresponding to a curve of the occlusal surface of the dental arch. Theoretically, the curve of occlusion is called a Monson curve. So, in the present invention, an imaginary spherical surface containing this Monson curve is called a “Monson sphere” and the “Monson spherical plate” is correspondingly denominated. The diameter or the size is, however, suitably changed to conform to the status of the teeth of a patient being corrected, without being constrained by this definition.
Meanwhile, the theoretical “Monson curve” is defined as “a sort of a compensating curve derived from the theory on a spherical surface concerned with jaw movements of G. S. Monson and forms a spherical surface 8 inch in diameter, with an inch corresponding to approximately 2.54 cm”, ENCYCLOPAEDIA DENTALIS, Jul. 20, 1976 first Edition, Nagasue Shoten, page 703. In this publication, there is a description which runs; “It is in actuality like a timepiece saucer of metal with a diameter of 8 inch. It first applies a compensating curve to an occlusion rim which is a portion of a spherical surface with the center lying in the glabella (ethmoid crista galli). A set of artificial teeth is arrayed so that its margo incisalis (incisal margin) and both buccolingual cusps contact the spherical surface. By arraying the set of artificial teeth in this manner, it is possible to realize a balanced occlusion so that the artificial teeth will extend along the condyle path upon the mandible movement in case of the full denture” (ibid). The theory of Monson sphere is “the theory of an imaginary jaw movement publicized by Monson in 1920” (ibid). There is also a description which runs; “In a well-grown mandible, the condile, margo incisalis of anterior teeth and buccolingual side cusps of the molar teeth are arranged on a sole spherical surface, with the mandible movements occurring as a sliding movement along this spherical surface. The long axis of each tooth is directed to the center of this sphere, with the center lying on a median line in the ethmoid crista galli, with the radius being said to be 4 inch on an average” (ibid).
Means for accomplishing the above object in further aspects of the present invention are now enumerated.
In a second aspect of the present invention, an arch chart comprising a maxillary (upper jaw) dental arch curve, scales and an arch reference line is preferably drawn in a concave surface of the Monson spherical plate and a portion thereof engaged by anterior teeth has a planar portion.
In a third aspect of the present invention, an arch chart comprising a mandiblar dental arch curve, scales and an arch reference line is preferably drawn on a convex surface of the Monson spherical plate and a portion thereof engaged by the anterior teeth has a planar portion.
In a fourth aspect of the present invention, legs are preferably provided on the bottom of the Monson spherical plate.
In a fifth aspect of the present invention, when seen in a projection view as seen from the center of sphere of the Monson spherical plate, the dental arch curve is formed preferably by drawing a curve along the contour of the outer side (buccal and labial side) of the dental arch so that the axis of symmetry of the curve traverses the center of the Monson spherical plate.
In a sixth aspect of the present invention, when seen in a projection view as seen from the center of sphere of the Monson spherical plate, the arch reference line preferably comprising an axis of symmetry of the dental arch curve and a tangential line drawn to an apex point of the dental arch curve.
In a seventh aspect of the present invention, when seen in a projection view as seen from the center of sphere of the Monson spherical plate, the scales preferably include a straight line interconnecting center points of left and right canines and a straight line connecting center points of the left and right first molar teeth.
In an eighth aspect of the present invention, when seen in a projection view as seen from the center of sphere of the Monson spherical plate, the planar portion preferably has, as its contour, a curve an axis of symmetry of which coincides with the axis of the dental arch curve and the direction of which is opposite to that of the dental arch curve, with points of intersection of the curve with the dental arch curve substantially coinciding with the positions of left and right canines.
In a ninth aspect of the present invention, the Monson spherical plate preferably has a radius of curvature equal to a reference size or to a variety of sizes different therefrom.
In a tenth aspect of the present invention, the Monson spherical plate has a spherical surface corresponding to a curve of an occlusal surface of a dental arch. Preferably, at least a portion of the plate engaged by anterior teeth is formed as a planar portion.
In an eleventh aspect of the present invention,, the Monson spherical plate preferably has a dental arch curve(curves) and scales on one of both of concave and convex surfaces of Monson spherical plate.
In a twelfth aspect of the present invention, the Monson spherical plate preferably includes an arch reference line constituting an axis of symmetry of dental arch curve on one of both of concave and convex surfaces of Monson spherical plate, with the scales being formed in a direction perpendicular to arch reference line.
In a thirteenth aspect of the present invention,, a method for preparing an arch wire includes using Monson spherical plate as defined above and forming a curve of the occlusal surface corresponding to the dental arch curve(curves) in an arch wire.
In a fourteenth aspect of the present invention, an arch wire conforming to the above object is prepared by the above-defined method.
In
Armstrong Westerman Hattori McLeland & Naughton LLP
Jinnouchi Hiroshi
Lucchesi Nicholas D.
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