[Clinical study of application of platform switching to dental implant treatment in esthetic zone].
OBJECTIVE
To evaluate the clinical results of dental implant treatment with platform switching technique in esthetic zone and to investigate its technical characteristics.


METHODS
Seventeen patients who were partially edentulous in esthetic zone were included and received a total of 26 Frialit-2 system implants in Center of Dental Implantation, Peking University School and Hospital of Stomatology from January to December 2001, and the platform switching technique was applied. The mean follow-up time was 56.3 months (24 to 74 months). Clinical examination and X-ray were conducted.


RESULTS
Clinical results of all implant restoration that used platform-switched abutments were satisfied. No implant loss or other severe complications occurred. The medians of marginal bone loss 1 year and 5 years after final restoration was 0.13 (-0.12 - 0.55) mm and 0.27 (-0.04 - 0.77) mm respectively. The medians of interimplant crestal bone resorption was 0.14 (0.00 - 0.30) mm and 0.21 (0.09 - 0.31) mm after 1 year and 5 years' functional loading respectively. According to Jemt classification of papilla, 23 sites reached II degree, and 10 sites reached III degree among 36 sites 5 years after prostheses. The mean value of pink esthetic score (PES) was 11.8 (10 - 14).


CONCLUSIONS
Platform switching is a simple and reliable technique for dental implant treatment, helping to control marginal bone loss and ensure an esthetic results in the esthetic zone.
Li
Qian
Q
Center of Dental Implantation, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Lin
Ye
Y
Qiu
Li-xin
LX
Hu
Xiu-lian
XL
Li
Jian-hui
JH
DI
Ping
P
D000328:Adult; D016301:Alveolar Bone Loss / Q000601:surgery*; D003757:Dental Implantation / Q000379:methods*; D004955:Esthetics, Dental; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult