the throughbore of the first mating member a spring loaded plunger member disposed within the casing and projecting therefrom and a retention member within the rotatable casing for limiting the extent of longitudinal travel of the plunger member application_number US 39372295 A description at the outset it should be clearly understood that the drawings are to be read together with the specification and are to be considered a portion of the entire 34 written description 34 of this invention as required by 35 u s c u00a7 112 also identical reference numerals on different figures refer to identical elements of the invention fig1 illustrates an extracoronal embodiment of the device shown generally at 10 in this embodiment first section 11 is secured to the side of fixed tooth 13 the first section may alternatively be secured to an implant and cooperating second section 12 would be secured within the dental prosthesis not shown the first section 11 includes a solid rectangular plate 14 from which extends toward the rear a dovetail spline 15 the height of the spline 15 extends the entire height of the plate 14 protruding from the front face 16 of the plate 14 and extending only from the lower half thereof is a first member 23 protruding from first member 23 is projecting block 18 which constitutes a recessed member the block 18 having a narrower width than the plate 14 and a wider width than first member 23 formed into.