Joining structure for processing

A joining structure for processing comprising a dental CAD/CAM block to be processed by a machine for producing a dental product and a block holder joined to the dental CAD/CAM block to hold it and to fix it to a cutting machine, further comprising:

• an engaging part formed by one or a plurality of engaging protrusions protruding from a first joint face that is either one of a joint face of the dental CAD/CAM block and a joint face of the block holder;
• an engagement reception part formed by one or a plurality of engaging depressions depressed from a second joint face that is the other of the joint face of the dental CAD/CAM block and the joint face of the block holder to receive the one or a plurality of engaging protrusions respectively;
• the engaging part and the engaging reception part being engaged with each other, and the dental CAD/CAM block and the block holder being joined by the adhesive held in the adhesive holding space;
• the dental CAD/CAM block is provided in a rectangular parallelepiped shape, and one of bottom faces thereof is a joint face;
• the engaging part or the engaging reception part is formed, when defining one face arbitrarily from the four rectangular parallelepiped side faces as the front face, the opposite face as a rear face, and the faces adjacent to the right and left sides toward the front face as a right side face and a left side face respectively, that one end face of the engaging part or the engaging reception part is on the same plane as the front face and extends toward the rear face direction;
• the engaging part or the engaging reception part is shaped, in a coordinate system in which a shared vertex of the other bottom face of the rectangular parallelepiped shape, the front face and the right side face is defined as an origin, x, y and z axes arranged along the first side shared by the other bottom face and the right side face, the second side shared by the other bottom face and the front face, and the third side shared by the front face and the right side face respectively and coordinates (x, y, z) of the end opposite the origin on the first, second and third sides are (100,0,0), (0, 100,0), and (0, 0, 100) respectively, as satisfy at least one of the following conditions;
• that
• (1) when the value of the x coordinate of the side end of the rear face is defined for each engaging part or each engaging reception part of the one or a plurality of engaging protrusions or the one or more of engaging depressions as L, the length of that engaging part or engaging reception part, and the maximum value therein is defined as Lmax, the maximum length of the one or a plurality of engaging protrusions or the one or more of engaging depressions, then:
• 100≥Lmax≥10;
• (2) when the x coordinate value of each engaging part or each engaging reception part of the one or a plurality of engaging parts or the one or more engaging reception part is p (where p is 0 or more and L or less rational number), and when the width of each engaging g part or each engaging reception part is Wn defined by the absolute value of the difference between the value of the y coordinate of one end part of that engaging part or engaging reception part and the value of the y coordinate of the other end part thereof, then the sum of the width Wn of all the engaging parts or the engaging reception parts is 1 or more and 70 or less, and the width Wn of all the engaging parts or the engaging reception parts are:
• 70≥Wo≥1 when P=0, and
• Wp-r≥Wp when p>0, where r is an arbitrary rational number of more than 0 and equal to or less than p;
• (3) when the x coordinate value of each engaging part or each engagement reception part of the one or a plurality of engaging protrusions or the one or a plurality of engaging depression parts is p (where p is 0 or more and L or less rational number), and the y coordinate value is q (where q is an arbitrary y coordinate value in a region where the engaging part or the engaging reception part exists when x=p), then the height of that engaging part or the depth of that engaging reception part Hp,q is, in actual size:
• 10 [mm]≥Ho,q>0.1 [mm] when p=0, and
• Hp-r,q≥Hp,q when p>0, where r is an arbitrary rational number of more than 0 and less than p.