Some properties of adjoint matrix are discussed. The properties are symmetry, antisymmetry, positive definite, positive semi-definite, orthogonal and characteristic value.
It is applicable for surface polishing, semi-polishing and matte polishing process of glaze tile with surface glazing, microlite tile and vitrified tile.
Using a simple semi-fixed lingual arch combined with the edgewise technology to correct 8 cases with linguoclination or buccoclination of the mandibular molars.