scholarly journals A preliminary in vitro study of machined abutment screw loosening on internal morse taper-connection implants

2017 ◽  
Vol 28 ◽  
pp. 9-9
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Screw Loosening ◽  
Abutment Screw

scholarly journals Effect of Cyclic Loading on Abutment Screw Loosening in Angled Implant AbutmentsAn In-vitro Study

2019 ◽  
Author(s):  
Syed Ershad Ahmed ◽  
Chitra Shankar Krishnan ◽  
Jayashree Mohan ◽  
Parithimar Kalaignan
Keyword(s):  
Cyclic Loading ◽  
In Vitro Study ◽  
Vitro Study ◽  
Screw Loosening ◽  
Abutment Screw

The Effect of Tissue Entrapment on Screw Loosening at the Implant/Abutment Interface of External- and Internal-Connection Implants: An In Vitro Study

2015 ◽  
Vol 25 (3) ◽  
pp. 216-223 ◽  
Author(s):  
Helios A. Zeno ◽  
Renan L. Buitrago ◽  
Sidney S. Sternberger ◽  
Marisa E. Patt ◽  
Nick Tovar ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Screw Loosening ◽  
Internal Connection ◽  
Implant Abutment

Effect of implant abutment connection designs, and implant diameters on screw loosening before and after cyclic loading: In-vitro study

2019 ◽  
Vol 35 (11) ◽  
pp. e265-e271 ◽  
Author(s):  
Sara Reda Sammour ◽  
Mohamed Maamoun El-Sheikh ◽  
Attiah Aly El-Gendy
Keyword(s):  
Cyclic Loading ◽  
In Vitro Study ◽  
Vitro Study ◽  
Screw Loosening ◽  
Implant Abutment ◽  
Before And After

scholarly journals Effect of Mechanical Cycling on Screw Torque in External Hexagon Implants with and without Platform Switching

2015 ◽  
Vol 26 (3) ◽  
pp. 284-287 ◽  
Author(s):  
Bruno Andrade Cantharino de Carvalho ◽  
Eduardo Vedovatto ◽  
Paulo Sérgio Perri de Carvalho ◽  
José Vitor Quinelli Mazaro ◽  
Rosse Mary Falcón-Antenucci
Keyword(s):  
In Vitro Study ◽  
Screw Loosening ◽  
Removal Torque ◽  
Tukey Test ◽  
Reverse Torque ◽  
Mechanical Cycling ◽  
Significant Difference ◽  
Platform Switching ◽  
Abutment Screw

This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw in external hexagon implants with platform switching (PS), regular platform (RP) and wide platform (WP). A total of 30 specimens were equally divided into 3 groups: PS, PR and WP. Each specimen was prepared with implants: 3.75 x 10 mm for RP group and 5.0x10 mm for PS and WP groups and its respective abutment with 32 Ncm torque. All groups were subjected to 106 cycles with 100 N (corresponding to about 40 months of chewing). The results were obtained with the reverse torque of each specimen and data were evaluated using ANOVA and Tukey test (p<0.05). The PS group showed statistically significant difference in screw removal torque (30.06±5.42) compared with RP (23.75±2.76) and WP (21.32±3.53) (p<0.05) groups; the RP and WP groups showed no statistically significant difference between them. It was concluded that the PS group showed higher reverse torque value, suggesting lower susceptibility of the abutment screw loosening.

scholarly journals Comparing Torque Loss in Standard Implants and Short Implants with Increased Vertical Cantilever Abutments: an In Vitro Study

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Ezzatollah Jalalian ◽  
Zahra Yousofi
Keyword(s):  
In Vitro Study ◽  
Longitudinal Axis ◽  
Screw Loosening ◽  
Reverse Torque ◽  
Short Implants ◽  
Significant Difference ◽  
Torque Loss ◽  
Student’S T ◽  
Abutment Screw

Objectives: With regard to the prevalence of abutment screw loosening (SL) and bone height reduction, particularly in the posterior regions of the jaws, as well as the contradictory issue of applying short implants instead of surgeries, along with all preparations associated with longer implants, the present study aimed to compare the amount of torque loss in short implants with increased vertical cantilever abutments and standard ones. Material and Methods: In this experimental study, a total number of 20 implants (MegaGen Implant Co., Ltd, South Korea) with 4.5 mm diameter including 10 short implants (7 mm) and 10 standard ones (10 mm) were utilized. Using a surveyor, fixtures were perpendicularly mounted in 13×34 mm resin for short implants and 19×34 mm resin for standard ones. The abutments of the same height but different cuff heights (2.5 mm for the standard implants and 5.5 mm for the short ones) were then tightened with 30 N.cm, via a digital torque meter. To compensate the settling effect, the abutment screw was re-tightened with 30 N.cm after 10 min. Upon applying 500,000 cycles at 75 N.cm and 1 Hz along the longitudinal axis on each sample, blind reverse torque value (RTV) was measured with a digital torque meter. The data were finally analyzed using Student’s t-test. Results: Both groups experienced torque loss, but there was no statistically significant difference between the case and control groups in terms of abutment SL (p = 0451). Conclusion: Short implants seem to be a good mechanical alternative in emergencies with respect to torque loss and abutment SL. KEYWORDS Reverse torque value; Cyclic loading, Short implant; Screw loosening; Crown-implant ratio; Torque loss.

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