Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for orthodontic anchorage

Toru Deguchi, Toshinori Yabuuchi, Masakazu Hasegawa, Lawrence P. Garetto, W. Eugene Roberts, Teruko Takano-Yamamoto

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Background: Recently, the use of miniscrews as an anchorage device has become a routine approach in the orthodontic field. However, there is no report that has analyzed the healing process of the miniscrew, such as the thickness of the cortical bone, in the past. Purpose: In the present study, to histologically assess the healing process of the osseous tissue surrounding miniscrews used as an orthodontic anchorage, the change in the thickness of the cortical bone was analyzed after 3, 6, and 12 weeks after the placement. Furthermore, the change in the bone-implant contact in different regions of the miniscrew during the initial healing period was also investigated. Materials and Methods: Ninety-six miniscrews were placed in eight beagle dogs. After 3, 6, and 12 weeks of healing, a force of 200-300g was applied to the force-applied groups for 12 weeks. Non-forced groups remained in the jaw without force application. Results: In the non-forced groups, a significant amount of cortical bone was formed at the head of the miniscrew at the initial stage of the healing process in the maxilla. However, less cortical bone formation was observed in the mandible. After the force application, increased bone formation was observed within 1mm of the miniscrew compared to other regions in both jaws. In the mandible, significantly less cortical bone was observed 3 and 6 weeks after the force application. Bone-implant contact revealed that the osseous tissue surrounding the miniscrew matured from the apex toward the head of the miniscrew. Conclusion: We suggest that this sufficient amount of cortical bone at the initial stage of healing enables the immediate loading in miniscrews to resist against orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible.

Original languageEnglish (US)
Pages (from-to)197-205
Number of pages9
JournalClinical Implant Dentistry and Related Research
Volume13
Issue number3
DOIs
StatePublished - Sep 2011
Externally publishedYes

Fingerprint

Orthodontics
Mandible
Head
Jaw
Osteogenesis
Bone and Bones
Maxilla
Cortical Bone
Dogs
Equipment and Supplies

Keywords

  • Cortical bone
  • Dog
  • Histomorphometric
  • Miniscrew
  • Orthodontics

ASJC Scopus subject areas

  • Dentistry(all)
  • Oral Surgery

Cite this

Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for orthodontic anchorage. / Deguchi, Toru; Yabuuchi, Toshinori; Hasegawa, Masakazu; Garetto, Lawrence P.; Roberts, W. Eugene; Takano-Yamamoto, Teruko.

In: Clinical Implant Dentistry and Related Research, Vol. 13, No. 3, 09.2011, p. 197-205.

Research output: Contribution to journalArticle

Deguchi, Toru ; Yabuuchi, Toshinori ; Hasegawa, Masakazu ; Garetto, Lawrence P. ; Roberts, W. Eugene ; Takano-Yamamoto, Teruko. / Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for orthodontic anchorage. In: Clinical Implant Dentistry and Related Research. 2011 ; Vol. 13, No. 3. pp. 197-205.
@article{4915d3400dcb4db9b855993ec2710a81,
title = "Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for orthodontic anchorage",
abstract = "Background: Recently, the use of miniscrews as an anchorage device has become a routine approach in the orthodontic field. However, there is no report that has analyzed the healing process of the miniscrew, such as the thickness of the cortical bone, in the past. Purpose: In the present study, to histologically assess the healing process of the osseous tissue surrounding miniscrews used as an orthodontic anchorage, the change in the thickness of the cortical bone was analyzed after 3, 6, and 12 weeks after the placement. Furthermore, the change in the bone-implant contact in different regions of the miniscrew during the initial healing period was also investigated. Materials and Methods: Ninety-six miniscrews were placed in eight beagle dogs. After 3, 6, and 12 weeks of healing, a force of 200-300g was applied to the force-applied groups for 12 weeks. Non-forced groups remained in the jaw without force application. Results: In the non-forced groups, a significant amount of cortical bone was formed at the head of the miniscrew at the initial stage of the healing process in the maxilla. However, less cortical bone formation was observed in the mandible. After the force application, increased bone formation was observed within 1mm of the miniscrew compared to other regions in both jaws. In the mandible, significantly less cortical bone was observed 3 and 6 weeks after the force application. Bone-implant contact revealed that the osseous tissue surrounding the miniscrew matured from the apex toward the head of the miniscrew. Conclusion: We suggest that this sufficient amount of cortical bone at the initial stage of healing enables the immediate loading in miniscrews to resist against orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible.",
keywords = "Cortical bone, Dog, Histomorphometric, Miniscrew, Orthodontics",
author = "Toru Deguchi and Toshinori Yabuuchi and Masakazu Hasegawa and Garetto, {Lawrence P.} and Roberts, {W. Eugene} and Teruko Takano-Yamamoto",
year = "2011",
month = "9",
doi = "10.1111/j.1708-8208.2009.00197.x",
language = "English (US)",
volume = "13",
pages = "197--205",
journal = "Clinical Implant Dentistry and Related Research",
issn = "1523-0899",
publisher = "Wiley-Blackwell",
number = "3",

}

TY - JOUR

T1 - Histomorphometric evaluation of cortical bone thickness surrounding miniscrew for orthodontic anchorage

AU - Deguchi, Toru

AU - Yabuuchi, Toshinori

AU - Hasegawa, Masakazu

AU - Garetto, Lawrence P.

AU - Roberts, W. Eugene

AU - Takano-Yamamoto, Teruko

PY - 2011/9

Y1 - 2011/9

N2 - Background: Recently, the use of miniscrews as an anchorage device has become a routine approach in the orthodontic field. However, there is no report that has analyzed the healing process of the miniscrew, such as the thickness of the cortical bone, in the past. Purpose: In the present study, to histologically assess the healing process of the osseous tissue surrounding miniscrews used as an orthodontic anchorage, the change in the thickness of the cortical bone was analyzed after 3, 6, and 12 weeks after the placement. Furthermore, the change in the bone-implant contact in different regions of the miniscrew during the initial healing period was also investigated. Materials and Methods: Ninety-six miniscrews were placed in eight beagle dogs. After 3, 6, and 12 weeks of healing, a force of 200-300g was applied to the force-applied groups for 12 weeks. Non-forced groups remained in the jaw without force application. Results: In the non-forced groups, a significant amount of cortical bone was formed at the head of the miniscrew at the initial stage of the healing process in the maxilla. However, less cortical bone formation was observed in the mandible. After the force application, increased bone formation was observed within 1mm of the miniscrew compared to other regions in both jaws. In the mandible, significantly less cortical bone was observed 3 and 6 weeks after the force application. Bone-implant contact revealed that the osseous tissue surrounding the miniscrew matured from the apex toward the head of the miniscrew. Conclusion: We suggest that this sufficient amount of cortical bone at the initial stage of healing enables the immediate loading in miniscrews to resist against orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible.

AB - Background: Recently, the use of miniscrews as an anchorage device has become a routine approach in the orthodontic field. However, there is no report that has analyzed the healing process of the miniscrew, such as the thickness of the cortical bone, in the past. Purpose: In the present study, to histologically assess the healing process of the osseous tissue surrounding miniscrews used as an orthodontic anchorage, the change in the thickness of the cortical bone was analyzed after 3, 6, and 12 weeks after the placement. Furthermore, the change in the bone-implant contact in different regions of the miniscrew during the initial healing period was also investigated. Materials and Methods: Ninety-six miniscrews were placed in eight beagle dogs. After 3, 6, and 12 weeks of healing, a force of 200-300g was applied to the force-applied groups for 12 weeks. Non-forced groups remained in the jaw without force application. Results: In the non-forced groups, a significant amount of cortical bone was formed at the head of the miniscrew at the initial stage of the healing process in the maxilla. However, less cortical bone formation was observed in the mandible. After the force application, increased bone formation was observed within 1mm of the miniscrew compared to other regions in both jaws. In the mandible, significantly less cortical bone was observed 3 and 6 weeks after the force application. Bone-implant contact revealed that the osseous tissue surrounding the miniscrew matured from the apex toward the head of the miniscrew. Conclusion: We suggest that this sufficient amount of cortical bone at the initial stage of healing enables the immediate loading in miniscrews to resist against orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible.

KW - Cortical bone

KW - Dog

KW - Histomorphometric

KW - Miniscrew

KW - Orthodontics

UR - http://www.scopus.com/inward/record.url?scp=79960932287&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79960932287&partnerID=8YFLogxK

U2 - 10.1111/j.1708-8208.2009.00197.x

DO - 10.1111/j.1708-8208.2009.00197.x

M3 - Article

VL - 13

SP - 197

EP - 205

JO - Clinical Implant Dentistry and Related Research

JF - Clinical Implant Dentistry and Related Research

SN - 1523-0899

IS - 3

ER -