Wave analysis of implant screw loosening using an air cylindrical cyclic loading device

Lee, Juneseok; Kim, Yungsoo; Kim, Chang-Whe; Han, Jung‐Suk

doi:10.1067/mpr.2002.128099

Cited by 35 publications

(39 citation statements)

References 15 publications

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“…Factors that influence preload are the geometry of the screw (thread pitch) and the mechanical properties of metal, including texture, surface finishing, surface settlement, and degree of lubrication. [591624252627]…”

Section: Discussionmentioning

confidence: 99%

“…However, published studies have used different methodologies for the applied axial load, frequency, and number of cycles. [52627] The frequency of cycles is reported in the literature as ranging from 1 to 19 Hz. [27] It was clarified that in a day, an individual typically performs three episodes of chewing lasting 15 min, with a frequency of 60 cycles per minute (1 Hz); this generates 2700 chewing cycles per day, which equals 1 million cycles per annum.…”

Section: Discussionmentioning

confidence: 99%

“…[52627] The frequency of cycles is reported in the literature as ranging from 1 to 19 Hz. [27] It was clarified that in a day, an individual typically performs three episodes of chewing lasting 15 min, with a frequency of 60 cycles per minute (1 Hz); this generates 2700 chewing cycles per day, which equals 1 million cycles per annum. [26] Considering that the frequency appears to have little importance in fatigue studies, the methodology uses a frequency of 8 Hz.…”

Section: Discussionmentioning

confidence: 99%

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Stability of external and internal implant connections after a fatigue test

et al. 2013

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Objective:The objective of this study was to compare the torque and detorque values of screw intermediates of external hexagon, internal hexagon, and Morse taper implants in single restorations before and after mechanical cycling.Materials and Methods:The study sample was divided into three groups (n = 10) as follows: group EH – external hexagon implant, group IH – internal hexagon implant, and group MT – Morse taper implant. Universal abutments were screwed on the implants, and metal crowns were cemented onto the abutment. The samples were submitted to a mechanical testing of 1 million cycles, with a frequency of 8 cycles per second under a 400 N load. The application and registration of the screw torque (T0) and detorque (T1) values of the intermediate were performed before and after the test. The results were statistically evaluated by analysis of variance (ANOVA) and Tukey's test (α = 0.05).Results:There was no difference between the values of T0 and T1 in the intra-group samples. However, the inter-group difference in T0 between the EH (12.8 N cm) and MT (18.6 N cm) groups and in T1 between the EH (10.4 N cm) and IH (13.8 N cm), EH and MT (19.4 N cm), and MT and IH (P = 0.001) groups were significant. The MT group showed a lower variation of T0 and T1.Conclusion:The internal implants, particularly MT, showed better stability in these cases when used for single restorations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Stability of external and internal implant connections after a fatigue test

et al. 2013

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“…As part of a study to clarify the features and advantages of internal anti-rotation configurations, the present study aimed to investigate the effect of cyclic loading on abutment screw loosening in internal and external hexagon implants. To date, only a few reports are available on abutment screw joint stability in external hexagon implant systems under eccentric cyclic loading [28][29][30][31] . Moreover, little or no data exist on screw loosening in internal hexagon implant systems under eccentric cyclic loading 32) .…”

Section: Introductionmentioning

confidence: 99%

Influence of lateral-oblique cyclic loading on abutment screw loosening of internal and external hexagon implants

Tsuge

Hagiwara

2009

Dental Materials Journal

108

116

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To date, there is no evidence that internal anti-rotation configurations are better than external ones. The purpose of this study was to evaluate the effect of eccentric cyclic loading on abutment screw loosening in internal and external hexagon implants with either of these two screw materials, titanium (Ti) alloy versus gold alloy. The reverse torque value of the abutment screw was measured before (initial preload) and after loading (post-loading). The prepared assemblies were divided into four groups (A to D). Groups A and B used internal hex implants with gold alloy and Ti alloy abutment screws respectively. Groups C and D used external hex implants with gold alloy and Ti alloy abutment screws respectively. In all the groups, post-loading preload was significantly (p<0.05) higher than initial preload. Further, two-way ANOVA indicated that the implant-abutment connection did not have an effect, but the abutment screw material did. In particular, Ti abutment screws were less likely to come loose.

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“…1 Although a low incidence of screw loosening or fracture has been reported, the resolution of such problems is time consuming, sometimes requiring multiple appointments. [2][3][4] The depth and the possibility of having the screw fragment wedged in a damaged area of the implant internal threads are factors that may influence the complexity and time involved in the retrieval attempt. 4 A simplified technique for the removal of fractured screw fragments is described.…”

mentioning

confidence: 99%