Effect of Double Screw on Abutment Screw Loosening in Single-Implant Prostheses.
OBJECTIVE
This study was conducted to assess the effect of using a double screw on the prevention of abutment screw loosening.


METHODS
Internal connected abutment with a single screw (IS), internal connected abutment with a double screw (ID), external connected abutment with a single screw (ES), and external connected abutment with a double screw (ED) groups were prepared (n = 10 in each group). After 50,000 loading cycles, postload removal torque loss (RTL) percentage was measured.


RESULTS
Postload RTL of ID and ED were smaller than those of IS and ES (P = .000 and P = .039, respectively).


CONCLUSIONS
This study showed that a double screw was more effective in prevention of screw loosening.
Young-Gun
YG
Shin
So-Yun
SY
Kim
Ho-Kyu
HK
Lee
Chang-Mo
CM
Jeong
So-Hyoun
SH
Lee
Jung-Bo
JB
Huh
D001732:Bite Force; D059605:Dental Implant-Abutment Design / Q000295:instrumentation*; D019250:Dental Implants, Single-Tooth; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D019232:Dental Restoration Failure; D006801:Humans; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D019415:Torque