Novel 3D printed TPMS scaffolds: microstructure, characteristics and applications in bone regeneration.

Bone defect disease seriously endangers human health and affects beauty and function. In the past five years, the three dimension (3D) printed radially graded triply periodic minimal surface (TPMS) porous scaffold has become a new solution for repairing bone defects. This review discusses 3D printing technologies and applications for TPMS scaffolds. To this end, the microstructural effects of 3D printed TPMS scaffolds on bone regeneration were reviewed and the structural characteristics of TPMS, which can promote bone regeneration, were introduced. Finally, the challenges and prospects of using TPMS scaffolds to treat bone defects were presented. This review is expected to stimulate the interest of bone tissue engineers in radially graded TPMS scaffolds and provide a reliable solution for the clinical treatment of personalised bone defects.

[The changes of palate cleft gap of complete unilateral cleft lip and palate infants before and after presurgical orthodontic and cheiloplasty].

OBJECTIVE: To study the changes of palate cleft gap of complete unilateral cleft lip and palate (UCLP) infants before and after presurgical orthodontic and cheiloplasty. METHODS: The sample consisted of 18 complete UCLP infants who were treated using presurgical nasoalveolar molding (PNAM) appliance and cheiloplasty. The maxillary models were obtained at the initial visit, after PNAM treatment 1 month before cheiloplasty, and 2 months after cheiloplasty. The change of palate cleft gap were compared. RESULTS: After PNAM treatment and cheiloplasty, the lip profile was obviously improved, cleft gap was reduced, and the height of ala nasi fornix was recovered. CONCLUSION: PNAM treatment can improve the lip shape and nasal deformity degree of UCLP patient. The cleft gap and upper lip tension are reduced.

[Assessment of upper jaw extraction versus upper and lower jaw extraction treatment for class II division 1 malocclusion using peer assessment rating index].

OBJECTIVE: To assess the outcome of orthodontic treatment with upper jaw or upper and lower jaw extraction for Class II division 1 malocclusion using the peer assessment rating (PAR) index. METHODS: 28 patients with Class II division 1 were extracted two first premolars or second premolars of upper jaw, and 24 patients were extracted four premolars of upper and lower jaw N. The PAR was applied on pre-and post-orthodontic treatment dental casts for the fifty-two cases. RESULTS: The upper and lower jaw extraction groups had significantly higher initial PAR scores and the weighted PAR total scores (P<0.05). Although significantly different before treatment, both groups were not statistically different after treatment (P>0.05). CONCLUSION: The upper and lower jaw extraction cases showed more severe dental displacement. Both treatment can acquire successful results.