How to distinguish dental writing from corresponding teeth?

1. Cross method means that the permanent teeth are divided into four areas by the "+"symbol, and each area is represented by 1-8 clusters of anterior teeth to posterior teeth. Similarly, if it is a deciduous tooth, the Roman numerals I ~ V are used to represent the central incisor to the second molar in each area in turn. 2. Universal numbering system: permanent teeth are represented by the number 1-32, the upper right third molar is designated as # 1, and the upper left third molar is designated as #16; Mandibular is numbered from left to right, the left lower third molar is # 17 and the right lower third molar is #32. Primary teeth were recorded by a-t. 3 International Dental Federation system: two-digit records were used. The single digit indicates the order of teeth, and the ten digit indicates the area. 1 indicates upper right area of permanent teeth, upper left area of permanent teeth, lower left area of permanent teeth, lower right area of permanent teeth, upper right area of deciduous teeth, upper left area of deciduous teeth, lower left area of deciduous teeth, and lower right area of deciduous teeth; The number of units indicates the position of the teeth from the front teeth to the midline, and the closer the teeth are to the midline, the smaller the number is.