Dental instrument for root canal therapy
AssigneeMani, Inc.
InventorsKanji Matsutani, Hideyuki Murai, Toshiyuki Takase
Life of this patent
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Abstract
A dental instrument for root canal therapy having a shaft portion and an operational portion extended from such shaft portion, wherein at least a region from the tip of the operational portion down to a predetermined distant position has a sectional form surrounded by an arc and a chord, and a length of a line segment along a vertical bisector of the chord sectioned between such chord and such arc equals to or longer than five-eighths of the diameter of a virtual circle composed by such arc was disclosed.
Claims8
A dental instrument for root canal therapy having a shaft portion and an operational portion extended from such shaft portion, wherein at least a region from the tip of the operational portion down to a predetermined distant position has a sectional form surrounded by an arc and a chord, and a length of a line segment along a vertical bisector of the chord sectioned between such chord and such arc equals to or longer than five-eighths of the diameter of a virtual circle composed by such arc.
A dental instrument for root canal therapy having a shaft portion and an operational portion extended from such shaft portion, wherein at least a region from the tip of the operational portion down to a predetermined distant position has a sectional form surrounded by an arc and two or three chords, a length of the shortest line segment along a vertical bisector of the chord sectioned between such chord and such arc or between two chords equals to or longer than five-eighths of the diameter of a circle composed by such arc, and a length of the arc equals to or longer than a half of the circumference of a virtual circle composed by such arc.
A method for fabricating a dental instrument for root canal therapy having a shaft portion and an operational portion extended from such shaft portion, and at least a region from the tip of the operational portion down to a predetermined distant position has a sectional form surrounded by an arc and a chord, comprising a step for producing a tapered cylinder within a region at least from the tip of the operational portion down to a predetermined distant position;
- and a step for removing the sidewall portion of the cylinder so as to produce a predetermined plane.
A dental instrument for root canal therapy having a shaft portion and an operational portion extended from such shaft portion, wherein at least a region from the tip of the operational portion down to a predetermined distant position has a sectional form surrounded by an arc and a chord, and such sectional form contains the center of a virtual circle which is assumed as having no chord.
A dental instrument for root canal therapy having a shaft portion and an operational portion extended from such shaft portion, wherein at least a region from the tip of the operational portion down to a predetermined distant position has a sectional form surrounded by an arc and two or three chords, and such sectional form contains the center of a virtual circle which is assumed as having no chord.
Dependencies are inferred from the claim text.