[Application of 3D printed double positioning guide in aesthetic restoration of anterior teeth]

To evaluate the clinical effect of 3D printing double positioning crown extension guide combined with 3D printing temporary crown in red aesthetic restoration of anterior teeth.

Twenty patients (70 teeth in total) who needed aesthetic restoration were randomly divided into 3D printing group (9 cases, 36 teeth) and traditional restoration group (11 cases, 34 teeth). The 3D printing team performed digital design, 3D printing double positioning crown lengthening guide to help crown lengthening operation, and 3D printed temporary crown was used after operation. The traditional group underwent diagnostic wax design, traditional film compression to make crown extension guide, 3D printed temporary crown after crown extension, and scored at 1 month, 3 months and 6 months after wearing the temporary crown. The clinical effect was evaluated from papilla index score(PIS), pink esthetic score(PES), white esthetic score(WES) and patient satisfaction. SPSS 28.0 software package was used for statistical analysis of the data.

The PIS score of the 3D printing group at 6 months was significantly better than that of the traditional restoration group(P＜0.05). The PES scores of 3D printing group at 1, 3 and 6 months were significantly higher than those of traditional restoration group(P＜0.05). WES scores at 1 month and 6 months in the 3D printing group were significantly higher than those in the traditional restoration group(P＜0.05). The overall satisfaction score of patients in the 3D printing group was higher than that in the traditional restoration group.

The application of digital design, 3D printing double positioning crown extension guide and temporary crown to guide aesthetic crown lengthening and restoration of anterior teeth can improve the effect of aesthetic restoration and make patients have better aesthetic restoration experience.