Year: 2025
Type: article
Abstract: This study aimed to assess the stability of the screw joint by comparing the implant abutment screw with a Morse-tapered design in the head with the existing implant abutment screw with a butt joint design.After the implant was fastened with either a support screw with a Morse-tapered design or an abutment screw with a butt-joint design, the specimens were divided into six groups.The nonloaded specimens were assigned to two groups: Group 1 (Morse taper) and Group 2 (butt joint).The specimens subjected to 100,000 loading cycles were assigned to Groups 3 and 4. Those subjected to 500,000 loading cycles were assigned to Groups 5 and 6.Each abutment screw was tightened to 35 Ncm.For Groups 1 and 2, the removal torque was measured 1 hour after tightening.For the other four groups, prostheses were fabricated and connected, and a cyclic loading of 50 N was applied before measuring the removal torque.The mean removal torques for Groups 1-6 were 34.24±1.67,27.30±0.74,31.80±1.61,27.20±0.93,32.82±0.90, and 26.84±1.39Ncm, respectively.Under all loading conditions, the abutment screws with the Morse-tapered design showed a higher mean removal torque than those with the butt-joint design.Implants assembled with abutment screws having a Morse-tapered connection design showed greater stability than those with a conventional butt-joint connection design.
Source: Oral Biology Research
DOI: 10.21851/obr.25.032
Authors: Tae-Hun Kim, Young-Hun Kwak, Soo-Yeon Lee, Hee-Jung Kim
Institution: Chosun University
Language: English
Subfield: Oral Surgery
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W7117675643