Dental appliance for introducing a filler material into a tooth cavity

A dental appliance for introducing a filler material into a tooth cavity, comprising a support;

• a filler pipe;
• means forming a first passage;
• a filler expelling element reciprocably movable in said first passage, said filler expelling element merging into said filler pipe and having a front end;
• a removable magazine which accommodates a filler and a plurality of portions of which can be expelled therefrom, said magazine extending transversely to said filler pipe and opening into the latter, said magazine having an inlet opening which opens into said filler pipe and is provided with an upper edge;
• a second passage;
• a magazine expelling element guided in said second passage for pressing a portion of the filler from said magazine into said filler pipe, said filler expelling element and said magazine expelling element being surrounded by said support;
• mechanical transmission means which couple said filler expelling element and said magazine expelling element with one another to provide coordination of their movements, said transmission means including a toothed rack which is connected with said magazine expelling element, an expelling lever which is turnably connected with said support and having a free end engaging in said toothed rack and an expelling button which is actuatable by a finger and connected with said filler expelling element, and a projection, said lever being arranged so that during the working stroke it displaces with said toothed rack via said expelling button and said projection in direction toward said filler pipe before said front end of said filler expelling element reaches said other end of said opening of said magazine into said filler pipe;
• a toothed pinion supported in said support;
• a rotary element connected with said toothed pinion for joint rotation therewith and having a first projecting portion for displacing said expelling lever and thereby said toothed rack of said magazine expelling element and a second projecting portion for displacing said filler expelling element;
• a toothed segment supported in said support and engaging with said toothed pinion, said expelling button being formed as a two-arm rotary slider turnably supported in said support and having one arm which is provided with a finger contact portion and extends beyond said support and another arm which has an end articulately engaging said toothed segment.