| 摘要 |
The matrix consisting of a thin flexible strip of plastic comprises a loop 1 to be placed around the tooth to give the desired shape to the filling material. It is permanently connected to an annular tightener (2) made of material permanently deformable by pressure with the fingers and dentist's forceps, for example, of annealed aluminum sheet. It exhibits, in the front, a slit (3) through which pass the two terminal extensions (1 min , 1 sec ) of flexible strip (1) and, in the back, tabs (2 min , 2 sec ) between which are permanently fastened the ends of said terminal extensions (1, 1 sec ) of said strip, so that by compressing said annular tightener (arrows 4, 5) it determines the slipping of slit (3) like a slider on the extensions (1 min , 11 sec ) of the strip, the narrowing of loop (1) and the perfect adherence of the loop of the strip to the tooth. |
