Augmentation rhinoplasty has gained popularity in China in the past decades and nasion profile is a key variable in aesthetic outcomes. The nasion is the deepest portion of the nasofrontal groove and its aesthetic preferences vary between different ethnic groups. At the time of this writing, there is limited research about ideal nasion measurements in the Chinese population. Therefore, we conducted an online survey of plastic surgeons and the public through social media. Participants were asked to rank nasion images according to their preferences. Images were created from a 3-dimensional scan of a Chinese Han female and modified to show various dimensions of nasion height, position, and forehead height. Nasion preferences were compared by age, sex, ethnicity, occupation, and whether had a history of plastic surgery. There were 777 respondents, including 461 (59.3%) women and 74 (9.5%) plastic surgeons. Nasion height of 8 and 10 mm ranked highest among all demographic groups. All respondents preferred nasion position to be level with the center of the pupil and forehead height of 4 mm above the nasion. Our study showed that the ideal Chinese nasion is in line with baseline ethnic characteristics. Therefore, plastic surgeons must be aware of these nasion preferences to guide preoperative discussions and achieve satisfactory outcomes.

Objective: The objective of this study was to observe the accuracy and security of the craniomaxillofacial plastic surgery robot in congenital craniosynostosis surgery and to enhance and improve its performance. Materials and Methods: We performed model surgical experiments on computed tomography data of 5 children with congenital craniosynostosis who were diagnosed and treated in our hospital, and model surgical experiments and animal experiments on the skulls of 3 Bama minipigs. Results: There was no statistically significant difference shown either in model experiments or animal experiments in comparing the actual operation with the surgical simulation and inside the groups (P > 0.05). Conclusions: The craniomaxillofacial plastic surgery robot has achieved good security and accuracy in model surgery and animal experiments. Further studies are needed to be conducted to confirm its security and accuracy and to continuously improve and refine the robot's performance.

Background The platysma is involved in the lower face movement, yet limited information on its functional role during perioral expressions can be found. Objectives The authors aimed to use 3-dimensional (3D) photogrammetry to analyze the platysma activity during expressions. Methods Standardized frontal view 3D images were obtained from fifty-four volunteers. Three perioral expressions were analyzed: a full smile, mouth corner depression, and a grimace to show the lower teeth. Using the superimposed image subtraction technique, the positive volume change in the “heat map” of the neck skin surface was used as a sensitive indicator of platysma contraction. Results During the three expressions, the proportion of platysma contraction was 42.6%, 75.9%, and 92.6%, respectively. We found platysma worked as a more critical dynamic force than expected. In most smiles involving the platysma, its upper portion contracted. With the laterally downward traction on the lower lip increasing, the upper and lower portions of the platysma contracted together and formed muscular bands. The platysma contracted extensively in the other two expressions. In some cases, platysma bands were observed by the vigorous contraction of muscle fibers. Besides, the platysma was found to be highly functionally active in young individuals. Conclusions This study introduced a simple method that could sensitively identify the functional status of the platysma. The results showed its highly active function in perioral expressions in young adults. It may assist surgeons in personalized decision-making toward platysma muscle-weakening strategies and work as an objective tool for the outcome evaluation.

Objective To evaluate and discuss the plastic surgery treatment of asymmetric crying face. Methods From 2019 to 2022, 60 patients with asymmetric crying face were treated by fascia lata grafting. We evaluated the postoperative improvement, summarized experiences and reviewed literatures about the treatment of asymmetric crying face. Results 59 patients showed varying degrees of improvement in the movement of the affected corner of mouth, and no complications were found during the follow-up period of 6 months to 24 months. Conclusions The cause of asymmetric crying face is still uncertain. Fascia lata grafting has shown a certain effect in the treatment of asymmetric crying face. This study evaluated this method with quite large sample. More researches are needed to explore the most appropriate treatment for asymmetric crying face.

Aim: To develop a novel and simplified parameter for mandible angle asymmetry (MAA) evaluation for facial countering surgeries in Chinese females. Materials and Methods: A total of 250 craniofacial computer tomography of healthy Chinese individuals were collected in this retrospective study. Mimics 21.0 was applied for 3-dimensional anthropometry. The Frankfort and Green planes were set as referenced vertical and horizontal planes for measuring the distances to gonions. The differences in both orientations were analyzed to verify the symmetry. Mandible angle asymmetry (∠Go-N-ANS, MAA) which comprehensively represented horizontal and vertical placements was defined qas the novel parameter for asymmetric evaluation and quantitative analysis was conducted to generate referenced materials. Results: Mandible angle asymmetry was divided into horizontal and vertical asymmetry. No significant differences were found in either horizontal or vertical orientations. The horizontal difference was 3.09 ± 2.52 mm, the reference range was (0.28, 7.54) mm, whereas the ± ertical difference was 2.59 ± 2.48 mm, the reference range was (0.12, 6.34) mm. The difference of MAA was 1.74 ± 1.30 degrees, and the reference range was (0.10,4.32)degrees. Conclusion:This study provided a novel parameter for asymmetric evaluation in the mandible angle region through quantitative 3-dimensional anthropometry, arousing plastic surgeons' attention to both aesthetics and symmetry in facial contouring surgery.