Mechanical and clinical evaluation of the effect of microscrew on root proximity and cortical bone thickness

Andrea E. Tsatalis; Keiichiro Watanabe; Bobby Mitchell; Do Gyoon Kim; Damian J. Lee; Fengyuan Zheng; Hee Moon Kyung; Toru Deguchi

doi:10.1093/ejo/cjz017

Mechanical and clinical evaluation of the effect of microscrew on root proximity and cortical bone thickness

Andrea E. Tsatalis, Keiichiro Watanabe, Bobby Mitchell, Do Gyoon Kim, Damian J. Lee, Fengyuan Zheng, Hee Moon Kyung, Toru Deguchi

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

BACKGROUND/OBJECTIVES: Primary stability is required for successful use of microscrew. This study investigated correlations among biomechanical, morphological, and clinical values in relationship to root contact and different placement locations.

MATERIALS/METHODS: Thirty-three microscrews were placed between the molars (n = 18) or in the body of the mandible (n = 15) in three pigs. Insertion torque, Periotest, resonance frequency analysis (RFA), and static and dynamic stiffness were measured. Cone beam computed tomography was performed before and after the insertion of microscrews. Interproximal microscrews were divided into root contacted microscrews (n = 9) and non-root contact microscrews (n = 9). Factorial analysis of variance was conducted, with significance set at P < 0.05.

RESULTS: A significant difference was observed between bodily and root contacted microscrews in Periotest, RFA, static and dynamic stiffness, Tanδ, and bone density (RFA, P = 0.045; all others, P < 0.001). A significant difference was observed between bodily and non-root contact microscrews in Periotest, RFA, and bone density (RFA, P = 0.025; all others, P < 0.001). A significant difference was observed in static (P = 0.01) and dynamic (P = 0.038) stiffness between microscrews with and without contact. Dynamic stiffness (P = 0.02) and Tanδ (P = 0.03) showed significant correlations with Periotest results only in bodily microscrews.

LIMITATIONS: Since a pig bone was used, some differences in the quality and quantity of the bone might be observed between humans.

CONCLUSIONS/IMPLICATIONS: Stiffness values distinguished between microscrews with and without contact. Periotest and RFA results indicated that bodily microscrews were more stable than interproximal microscrews. Periotest and RFA may be useful with large, microscrews and/or in thick cortical bone, but further investigation is required to determine the stability of interproximal microscrews.

Original language	English (US)
Pages (from-to)	206-210
Number of pages	5
Journal	European Journal of Orthodontics
Volume	42
Issue number	2
DOIs	https://doi.org/10.1093/ejo/cjz017
State	Published - Apr 1 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© The Author(s) 2019. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved

Keywords

Animals
Bone Density
Cortical Bone/diagnostic imaging
Dental Implantation, Endosseous
Dental Implants
Humans
Mandible/diagnostic imaging
Osseointegration
Swine
Torque

PubMed: MeSH publication types

Journal Article

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10.1093/ejo/cjz017

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title = "Mechanical and clinical evaluation of the effect of microscrew on root proximity and cortical bone thickness",

abstract = "BACKGROUND/OBJECTIVES: Primary stability is required for successful use of microscrew. This study investigated correlations among biomechanical, morphological, and clinical values in relationship to root contact and different placement locations.MATERIALS/METHODS: Thirty-three microscrews were placed between the molars (n = 18) or in the body of the mandible (n = 15) in three pigs. Insertion torque, Periotest, resonance frequency analysis (RFA), and static and dynamic stiffness were measured. Cone beam computed tomography was performed before and after the insertion of microscrews. Interproximal microscrews were divided into root contacted microscrews (n = 9) and non-root contact microscrews (n = 9). Factorial analysis of variance was conducted, with significance set at P < 0.05.RESULTS: A significant difference was observed between bodily and root contacted microscrews in Periotest, RFA, static and dynamic stiffness, Tanδ, and bone density (RFA, P = 0.045; all others, P < 0.001). A significant difference was observed between bodily and non-root contact microscrews in Periotest, RFA, and bone density (RFA, P = 0.025; all others, P < 0.001). A significant difference was observed in static (P = 0.01) and dynamic (P = 0.038) stiffness between microscrews with and without contact. Dynamic stiffness (P = 0.02) and Tanδ (P = 0.03) showed significant correlations with Periotest results only in bodily microscrews.LIMITATIONS: Since a pig bone was used, some differences in the quality and quantity of the bone might be observed between humans.CONCLUSIONS/IMPLICATIONS: Stiffness values distinguished between microscrews with and without contact. Periotest and RFA results indicated that bodily microscrews were more stable than interproximal microscrews. Periotest and RFA may be useful with large, microscrews and/or in thick cortical bone, but further investigation is required to determine the stability of interproximal microscrews.",

keywords = "Animals, Bone Density, Cortical Bone/diagnostic imaging, Dental Implantation, Endosseous, Dental Implants, Humans, Mandible/diagnostic imaging, Osseointegration, Swine, Torque",

author = "Tsatalis, {Andrea E.} and Keiichiro Watanabe and Bobby Mitchell and Kim, {Do Gyoon} and Lee, {Damian J.} and Fengyuan Zheng and Kyung, {Hee Moon} and Toru Deguchi",

year = "2020",

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doi = "10.1093/ejo/cjz017",

language = "English (US)",

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T1 - Mechanical and clinical evaluation of the effect of microscrew on root proximity and cortical bone thickness

AU - Tsatalis, Andrea E.

AU - Watanabe, Keiichiro

AU - Mitchell, Bobby

AU - Kim, Do Gyoon

AU - Lee, Damian J.

AU - Zheng, Fengyuan

AU - Kyung, Hee Moon

AU - Deguchi, Toru

PY - 2020/4/1

Y1 - 2020/4/1

N2 - BACKGROUND/OBJECTIVES: Primary stability is required for successful use of microscrew. This study investigated correlations among biomechanical, morphological, and clinical values in relationship to root contact and different placement locations.MATERIALS/METHODS: Thirty-three microscrews were placed between the molars (n = 18) or in the body of the mandible (n = 15) in three pigs. Insertion torque, Periotest, resonance frequency analysis (RFA), and static and dynamic stiffness were measured. Cone beam computed tomography was performed before and after the insertion of microscrews. Interproximal microscrews were divided into root contacted microscrews (n = 9) and non-root contact microscrews (n = 9). Factorial analysis of variance was conducted, with significance set at P < 0.05.RESULTS: A significant difference was observed between bodily and root contacted microscrews in Periotest, RFA, static and dynamic stiffness, Tanδ, and bone density (RFA, P = 0.045; all others, P < 0.001). A significant difference was observed between bodily and non-root contact microscrews in Periotest, RFA, and bone density (RFA, P = 0.025; all others, P < 0.001). A significant difference was observed in static (P = 0.01) and dynamic (P = 0.038) stiffness between microscrews with and without contact. Dynamic stiffness (P = 0.02) and Tanδ (P = 0.03) showed significant correlations with Periotest results only in bodily microscrews.LIMITATIONS: Since a pig bone was used, some differences in the quality and quantity of the bone might be observed between humans.CONCLUSIONS/IMPLICATIONS: Stiffness values distinguished between microscrews with and without contact. Periotest and RFA results indicated that bodily microscrews were more stable than interproximal microscrews. Periotest and RFA may be useful with large, microscrews and/or in thick cortical bone, but further investigation is required to determine the stability of interproximal microscrews.

AB - BACKGROUND/OBJECTIVES: Primary stability is required for successful use of microscrew. This study investigated correlations among biomechanical, morphological, and clinical values in relationship to root contact and different placement locations.MATERIALS/METHODS: Thirty-three microscrews were placed between the molars (n = 18) or in the body of the mandible (n = 15) in three pigs. Insertion torque, Periotest, resonance frequency analysis (RFA), and static and dynamic stiffness were measured. Cone beam computed tomography was performed before and after the insertion of microscrews. Interproximal microscrews were divided into root contacted microscrews (n = 9) and non-root contact microscrews (n = 9). Factorial analysis of variance was conducted, with significance set at P < 0.05.RESULTS: A significant difference was observed between bodily and root contacted microscrews in Periotest, RFA, static and dynamic stiffness, Tanδ, and bone density (RFA, P = 0.045; all others, P < 0.001). A significant difference was observed between bodily and non-root contact microscrews in Periotest, RFA, and bone density (RFA, P = 0.025; all others, P < 0.001). A significant difference was observed in static (P = 0.01) and dynamic (P = 0.038) stiffness between microscrews with and without contact. Dynamic stiffness (P = 0.02) and Tanδ (P = 0.03) showed significant correlations with Periotest results only in bodily microscrews.LIMITATIONS: Since a pig bone was used, some differences in the quality and quantity of the bone might be observed between humans.CONCLUSIONS/IMPLICATIONS: Stiffness values distinguished between microscrews with and without contact. Periotest and RFA results indicated that bodily microscrews were more stable than interproximal microscrews. Periotest and RFA may be useful with large, microscrews and/or in thick cortical bone, but further investigation is required to determine the stability of interproximal microscrews.

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KW - Bone Density

KW - Cortical Bone/diagnostic imaging

KW - Dental Implantation, Endosseous

KW - Dental Implants

KW - Humans

KW - Mandible/diagnostic imaging

KW - Osseointegration

KW - Swine

KW - Torque

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Mechanical and clinical evaluation of the effect of microscrew on root proximity and cortical bone thickness

Abstract

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