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US 3,943,913 AGranted
Apparatus and method for determining tooth mobility
OwnerRobert J. Johnsoninventor
Life of this patent
Estimating the term…
Abstract
A dental impression tray fastened to teeth in one quadrant, supports through a semi-rigid, non-resilient member, an electric transducer having an input probe positioned against the lingual surface of a tooth. A strip chart recorder is electrically coupled to the transducer and produces a graph in response to movement of the tooth caused by externally manually applied bi-directional forces on the tooth. A special tool is employed to apply forces, being adapted not only to movement of molars, but also incisors.
Claims18
A method for determining the mobility of a tooth and comprising the steps of:
- temporarily attaching sensor mounting means to at least one tooth;
- supporting a sensor on said mounting means;
- placing a probe of said sensor against a surface of a subject tooth whose mobility is of interest;
- engaging said subject tooth with a tool and pushing and pulling said subject tooth;
- sensing electrically the movement of said probe caused by pushing and pulling on said subject tooth;
- and taking the electrical response derived from the electrical sensing step and supplying the response to a recorder and producing on said recorder a graph in accordance with the movement of said subject tooth.
3 more elements
Apparatus for checking the mobility of a tooth and comprising:
- a dental impression tray securable to teeth in a quadrant of an arch of teeth;
- a transducer mounted to said tray and having sensor means for application to a tooth of interest for detecting movement of the tooth relative to said impression tray, said transducer having signal output means for producing a signal thereon in response to detection of movement of the tooth of interest;
- a recorder having signal input means;
- and means coupling said transducer signal output means to said recorder signal input means for production of a record by said recorder in response to movements detected by said transducer.
1 more element
Dependencies are inferred from the claim text.