Method for determining of movement patterns during a dental treatment

Method for determining a movement pattern of a dental treatment means, in particular of a toothbrush, said movement pattern resulting during a dental treatment, in particular teeth cleaning, at least comprising the steps:

• moving the dental treatment means at least in an X/Y plane in order to treat surface portions of the teeth, wherein data are recorded by means of at least one optical detection device
• wherein the data represent characteristic body points of the hand, body lines of the hand and/or body surfaces of the hand by which the dental treatment means is being guided,
• wherein the data are recorded relating to at least one movement parameter of the dental treatment means relative to a reference system which moves with the head of the treated person,
• providing the recorded data to a processor device for determining the movement pattern, wherein the processor device defines a further three-dimensional reference system which at least at times during a movement of the dental treatment means moves in space with the dental treatment means, wherein the further reference system is formed by the characteristic body points of the hand, body lines of the hand and/or body surfaces of the hand by which the dental treatment means is being guided, and
• determining the movement pattern, wherein at least one relative movement between the reference system moving with the head of the treated person and the further reference system is determined.