Patent CA-3045293-A1 (CA)
Title: A measurement device and a method for recording the positions of teeth
Inventor: SZCZERBANIEWICZ BLAZEJ
IPC: A61C19/04
Filed: 2018-02-21
Abstract: A measurement device for determination of fixed reference points using positioning devices (4a and 4b), para-occlusal index tray (5), changeable recording index plates/ sensor (6) and impression material (15) wherein the recording process occurring via the control system (2) is initiated and stopped by means of control buttons (10) characterized in that said device consists of hoop frame (1) to be placed on the head, preferably in the form of an elastic band, featuring a control system (2) and reference handle (3) located centrally in the frontal part and mounted at the base of the nose. The reference handle is preferably equipped with recording device (4a) or recorded device (4b); and para-occlusal index tray (5) to which single-use recording index plates/sensors (6) are mounted and on which the impression material (15) is placed. The para- occlusal index tray preferably equipped with recorded device (4b) or recording device (4a). The recording devices (4a) and recorded devices (4b) mounted to the reference handle (3) and the para-occlusal index tray (5) should be aligned centrally along the axis of symmetry of the patient's face and are connected to the control system (2). A method for recording the position of teeth using the reference points initiated and stopped by means of control buttons (10) and consisting of determination of individual patient's reference points by aligning preferably the recording device (4a) or the recorded device (4b) placed on the reference handle (3) located on the hoop frame (1) placed on patient's head, to the patient's anatomy. The alignment is preferably achieved using linear graduation scale placed on the reference handle and the indicator (93) on housing (9) and aligning preferably the recording device (4a) or the recorded device (4b) to the axis of symmetry of the patient's face according to the patient's anatomical features, followed by pairing preferably the recording device (4a) or the recorded device (4b) located on the reference handle (3) with preferably the recorded device (4b) or recording device (4a) located outside the patient's mouth on the para-occlusal index tray (5). The para-occlusal index tray (5) in its part located inside the patient's mouth is equipped with a changeable recording index plate/sensor (6) covered with impression material (15) to be bitten by the patient so that the impression material, when set, remembers the shape and impression of upper and/ or lower teeth and ensures stable positioning of the para-occlusal index tray (5). After setting of the impression material both devices (4a and 4b), i.e. the devices located on the reference handle (3) and the para-occlusal index tray (5) are centrally aligned to the axis of symmetry of the patient's face in a defined anatomical relationship being recorded by the recording system (2).  Both devices (4a and 4b) define unambiguous, fixed reference points determined by angular measurement of the position of upper teeth in space as well as in relation to the head, i.e. a mutual, unambiguously and simultaneously defined relationship between those by taking into consideration angular measurements consisting of determination of differences in the angular position of para-occlusal index tray (5), preferably connected to a recording index plate (6) and the reference point, with the data originating from both devices (4a and 4b), i.e. the devices located on the reference handle (3) and the para-occlusal index tray (5) are transmitted to the control system (2) permitting their use for determination of geometrical relationship between the positions of the upper and the lower jaw of the patient.