So sánh hình thái răng hàm sữa thứ hai với hệ thống chụp thép tiền chế sử dụng máy quét 3D

A cross-sectional study was conducted to evaluate the average size of the left-side lower and upper second primary molars of a group of 4 to 6-year-old children in Hanoi. A 3D scanner was used to gather data, which was then compared with the dimensions of prefabricated GNI and Shinhung stainless steel crowns for clinical application, aiding dentists in selecting appropriate crown sizes and preserving primary teeth. The study results revealed that the average size of the upper molars in boys was larger than in girls, especially in terms of the mesiodistal dimension of the lower second primary molars (boys: 10.57 ± 0.44mm, girls: 10.13 ± 0.56mm) and the height of the upper molars (boys: 4.78 ± 0.46mm; girls: 4.32 ± 0.55mm) (p<0.05). Based on the average size of the second primary molars, clinical dentists can choose the size for the upper second primary molars and the size for the lower ones when considering male children. For female children, the appropriate crown size for both the upper and lower jaws is 4. Regarding Shinhung crowns, the suitable sizes in the upper and lower jaws are 3 and 4 for females, and 4 and 5 for males, respectively.