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Effect of fluid contamination on reverse torque values in implant-abutment connections under oral conditions

Mostafavi AS, Memarian M, Seddigh MA

Purpose Implant mechanical complications, including screw loosening, can influence dental implant success. It has been shown that torque values are affected by contamination occurred in implant-abutment (I/A) interface. This study...
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Finite element analysis of the effect of novel Lock Screw system preventing abutment screw loosening

Im ES, Kim JE, Kim JH, Park YB

PURPOSE: The purpose of this finite element analysis study is to introduce the novel Lock screw system and analyze its mechanical property to see if it can prevent abutment screw...
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Repairment of abutment and abutment screw fracture in implant prosthesis: A case report

Kim JH, Yoo JJ, Kim MY, Yoon JH

Dental implants are an effective and predictable treatment for restoration of missing teeth. However, as the use of implants increases, complications are also increasing. The mechanical complications are not only...
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The effect of heat to remove cement on implant titanium abutment and screw

Yi HG, Gil KS, Lee JJ, Ahn SG, Seo JM

PURPOSE: The purpose of this study was to investigate the effect of heat applied to disintegrate cement on the removal torque value and fracture strength of titanium abutment and abutment...
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Removal torque of a two-piece zirconia abutment with a novel titanium component in an internal connection implant system after dynamic cyclic loading

Lee JH

PURPOSE: The aim of this study was to evaluate screw removal torque of the two-piece zirconia abutment with the novel titanium component compared to the conventional onepiece titanium abutment in...
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Effect of abutment screw length and cyclic loading on removal torque in external and internal hex implants

Mohammed H, Lee JH, Bae JM, Cho HW

PURPOSE: The purpose of this study was to evaluate the effects of abutment screw length and cyclic loading on the removal torque (RTV) in external hex (EH) and internal hex...
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Comparison of removal torque between prefabricated and customized abutment screw

Jamiyandorj O, Kim JH, Kim MS, Park YB, Shim JS

PURPOSE: The purpose of this study is to compare the removal torque between prefabricated and customized implant abutment screw. MATERIALS AND METHODS: Three types of implant system (Osstem, Astra, Zimmer) were...
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Evaluation of the stress distribution in the external hexagon implant system with different hexagon height by FEM-3D

Park SJ, Kim JH, Kim SY, Yun MJ, Ko SM, Huh JB

  • KMID: 2408200
  • J Korean Acad Prosthodont.
  • 2012 Jan;50(1):36-43.
PURPOSE: To analyze the stress distribution of the implant and its supporting structures through 3D finite elements analysis for implants with different hexagon heights and to make the assessment of...
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A study on accuracy and application of the implant torque controller used in dental clinic

Joo YH, Lee JH

  • KMID: 2321780
  • J Korean Acad Prosthodont.
  • 2011 Jul;49(3):197-205.
PURPOSE: This study was to evaluate the accuracy of the implant torque controller used in dental clinics and to investigate whether it was applied appropriately. MATERIALS AND METHODS: Fifty dentists who...
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Abrasion of abutment screw coated with TiN

Jung SW, Son MK, Chung CH, Kim HJ

STATEMENT OF PROBLEM: Screw loosening has been a common complication and still reported frequently. PURPOSE: The purpose of this study was to evaluate abrasion of the implant fixture and TiN...
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Influence of Tightening Torque on Implant-Abutment Screw Joint Stability

Shin HM, Jeong CM, Jeon YC, Yun MJ, Yoon JH

  • KMID: 2000419
  • J Korean Acad Prosthodont.
  • 2008 Aug;46(4):396-408.
STATEMENT OF PROBLEM: Within the elastic limit of the screw, the greater the preload, the tighter and more secure the screw joint. However, additional tensile forces can incur plastic deformation...
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Detorque force and surface change of coated abutment screw after repeated closing and opening

Jang JS, Kim HJ, Chung CH

STATEMENT OF PROBLEM: Recently researches about WC/C (Tungsten Carbide/Carbon) or TiN (Titanium Nitride) coating on abutment screws are going on. It decreases friction coefficient, resistance against corrosion and withdrawal of...
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A study of the effect of an anti-rotational inner post screw systems on abutment screw loosening for single implant : Part 1

Choi SY, Lee JB

  • KMID: 2195657
  • J Korean Acad Prosthodont.
  • 2007 Jun;45(3):345-353.
STATEMENT OF PROBLEM: Implant abutment screw joints tend to loosen under clinical conditions. Abutment screw loosening results in loss of preload in function. PURPOSE: Anti-rotational inner post screw (ARIPS) systems were...
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Effect of TiN coating of abutment screw on detorque force

Kim HJ, Choe HC, Chung CH

  • KMID: 2195655
  • J Korean Acad Prosthodont.
  • 2007 Jun;45(3):329-338.
PURPOSE: The aim of this study is to evaluate the effect of TiN coating of abutment screw on the unscrewing torque. MATERIAL AND METHODS: Titanium and Gold-Tite abutment screws were classified...
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Detorque force of TiN-coated abutment screw with various coating thickness after repeated closing and opening

Kim HS, Kim HJ, Chung CH

  • KMID: 2195632
  • J Korean Acad Prosthodont.
  • 2007 Dec;45(6):769-779.
STATEMENT OF PROBLEM: When TiN coating is applied to the abutment screw, occurrence of greater preload and prevention of the screw loosening could be expected due to decrease of frictional...
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The influence of abutment screw length and repeated tightening on screw loosening in dental implant

Choi JH, Yang JH, Cho WP, Lee JB

  • KMID: 2000674
  • J Korean Acad Prosthodont.
  • 2006 Aug;44(4):432-442.
Statement of problem: One of common problems associated with dental implant is the loosening of abutment screws that retain the implants. Purpose: This study was performed to investigate the...
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Application of finite element analysis to evaluate implant fractures

Kim YS, Kim CW, Lim YJ, Kim MJ

  • KMID: 2000681
  • J Korean Acad Prosthodont.
  • 2006 Jun;44(3):295-313.
Statement of problem. Higher fracture rates were reported for Branemark implants placed in the maxilla and for 3.75 mm diameter implants installed in the posterior region. Purpose. The purpose of...
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Influence of tungsten carbide/carbon coating on the preload of implant abutment screws

Choi JU, Jeong CM, Jeon YC, Lim JS, Jeong HC, Eom TG

  • KMID: 2195712
  • J Korean Acad Prosthodont.
  • 2006 Apr;44(2):229-242.
STATEMENT OF PROBLEM: In order to increase preload with reducing the friction coefficient, abutment screws coated with pure gold and Teflon as dry lubricant coatings have been introduced. But the...
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The effects of the design of abutment screw driver on the amount of time for insertion of screw driver into abutment screw head

Kim SK

  • KMID: 2136361
  • J Korean Acad Prosthodont.
  • 2005 Apr;43(2):258-263.
STATEMENT OF PROBLEM: Implant screw loosening has been remained a problem in implant prosthodontics. The time needed to insert screw driver into abutment screw head should be shortened for the...
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Three-dimensional finite element stress analysis of single implant restoration using different fixture and abutment screw diameters

Kwon JH, Choi MH, Kim YL, Cho HW

  • KMID: 2195723
  • J Korean Acad Prosthodont.
  • 2005 Feb;43(1):105-119.
STATEMENT OF PROBLEM: As the effects of the various diameters of fixture and abutment screw on stress distribution was not yet examined, this study focused on the different design of...
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