种植体不同基台连接方式对上颌单个前牙种植修复美学的影响

Effects of different implant-abutment connections on aesthetic restoration of single maxillary anterior teeth

BACKGROUND: Implant-abutment connection has become a key factor in the success of implant restoration, but  the effects of different implant-abutment connections on peri-implant tissues is unclear.OBJECTIVE: To compare the effects of three different implant-abutment connections on the alveolar bone and peri-implant soft tissues at the maxillary esthetic zone.METHODS: Sixty patients undergoing aesthetic restoration of single maxillary anterior tooth were enrolled randomly, including 20 cases of Bego Replace system, 20 of Osstem Replace system, and 20 cases of ITI Replace system. All the patients had a follow-up of 3 to 6 months after the surgery, and then received the two-stage surgery. Radiographic and clinical examinations were made at the same time. Peri-implant bone height measured was used as the reference line. The final crowns were made after 2 weeks, and the peri-implant bone resorption and pink esthetic scores were evaluated after 12 months shown through X-ray films.RESULTS AND CONCLUSION: There were significant differences in peri-implant marginal bone loss and pink esthetic scores among different groups after implant restoration. The amount of marginal bone loss around implants using platform switching was significantly less than that using platform butt-joint (P < 0.0.5), and the pink esthetic scores of the former group was higher than the later one (P < 0.05). These findings indicate that aesthetic restoration of a single maxillary tooth implant using platform switching is able to preserve better marginal bone and acquire better aesthetic effects.