[Application of single anterior teeth defect with computer-aided design and computer-aided manufacturing polymethyl methacrylate single-retainer resin-bonded fixed dental prosthesis in children].

Objective: To explore the clinical effect of computer-aided design and computer-aided manufacturing (CAD/CAM) polymethyl methacrylate (PMMA) single-retainer resin-bonded fixed dental prosthesis (RBFDP) for single anterior teeth defect. Methods: A total of 14 children between 10-14 years old (male 8, female 6) who visited the Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University from March to December 2022 with single anterior teeth loss were enrolled in this study. The intraoral scanner was used to obtain their digital impressions, and then the data were imported into CAD software. The single-retainer RBFDP was designed by the CAD software and was manufactured by milling equipment using CAD/CAM PMMA disk. The prosthesis was then tried-in and bonded to the abutment teeth with resin cement and evaluated in a 12 month follow-up observation. The marginal discoloration, marginal adaptation, color match, secondary caries, the occurrence of fractures and loose of abutment tooth were examined on the basis of the modified United States Public Health Services evaluation system. The evaluation was divided into three scores, in which score A indicated ideal restoration effect, score B means that the restoration effect was acceptable (evaluation of restoration integrity, loose of abutment teeth and secondary caries excluded), and score C indicates that the restoration effect is not good. Results: All the 14 CAD/CAM PMMA single-retainer RBFDP had good marginal adaptation and color match with no marginal discoloration, no secondary caries, no fracture of restorations and no abnormal loose of the abutment teeth. All of the six criteria achieved score A evaluation after a three month follow-up observation. One restoration was classified as score B for fracture after a six month follow-up observation, while two restoration were classified as score B for marginal discoloration after 12 month follow-up observation. Conclusions: The CAD/CAM PMMA single-retainer RBFDP was clinically effective in restoration of single anterior teeth defect in children.目的： 探讨计算机辅助设计与辅助制作（CAD/CAM）聚甲基丙烯酸甲酯（PMMA）单端粘接桥修复儿童单颗前牙缺失的临床效果，为其临床应用提供参考。 方法： 于2022年3至12月就诊于第四军医大学口腔医院儿童口腔科的10~14岁儿童中选择单颗前牙缺失患儿14例，其中男性8例，女性6例；上颌中切牙9颗，上颌侧切牙5颗。使用口内扫描仪进行数字化印模制取，计算机辅助设计单端粘接桥，使用CAD/CAM PMMA材料进行数字化制作，之后进行口内试戴、粘接。术后3、6、12个月进行随访，检查修复体有无边缘着色、边缘密合性、颜色、继发龋、有无折断及基牙松动情况，根据改良美国公共卫生署对修复体的临床评价标准进行评价，评价分为3个等级，A表示修复效果理想，B表示修复效果尚可（不包括修复体完整性、基牙松动度及继发龋评价），C表示修复效果不佳。 结果： 在临床随访期间14例CAD/CAM PMMA单端粘接桥均未出现脱落，术后3个月14例修复体均无边缘着色，边缘密合性良好，颜色未见变化，无继发龋，未出现修复体折断，基牙无异常松动，所有评价指标均为A级；术后6个月1例修复体折断为B级；术后12个月2例修复体出现边缘着色评价为B级。 结论： CAD/CAM PMMA单端粘接桥修复儿童单颗恒前牙缺失临床效果良好。.