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Fakih KA, Edreva MS, Stoichkov BB. Removal of a Horizontally Displaced Dental Implant below the Mandibular Canal. Case Rep Dent 2023; 2023:6663874. [PMID: 37006703 PMCID: PMC10065860 DOI: 10.1155/2023/6663874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/12/2023] [Accepted: 03/16/2023] [Indexed: 03/28/2023] Open
Abstract
A clinical case of a horizontally displaced dental implant, which moved below the level of the mandibular canal during surgery is presented together with a brief review of the comparable published cases. The bone mineral density and the morphology of the alveolar ridge were analyzed at the site of osteotomy, and the low bone density of
Hounsfield Units was found in the area. The factors related to implant displacement were: the anatomical features of bone structure, and the applied mechanical pressure during the implant insertion. The displacement of the dental implant below the level of the mandibular canal during implantation can be a severe complication. Its removal requires the safest surgical approach to avoid damaging the inferior alveolar nerve. The description of one clinical case does not provide grounds for drawing definite conclusions. To avoid similar incidents, detailed radiographic assessment before implantation is necessary; it is also important to follow the surgical protocols of implant placement into soft bone and to create conditions for a good visibility and sufficient control of bleeding during surgery.
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Okamura M, Suzuki T, Oomura Y, Matsunaga S, Nomura T. Effect of Bacterial Infection on Bone Quality and Structure in Osteonecrosis of the Jaw by Bisphosphonate (BP) Administration. J HARD TISSUE BIOL 2021. [DOI: 10.2485/jhtb.30.323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Masahiro Okamura
- Department of Oral Oncology, Oral and Maxillofacial Surgery, Tokyo Dental College
| | - Taiki Suzuki
- Department of Oral Oncology, Oral and Maxillofacial Surgery, Tokyo Dental College
| | - Yusuke Oomura
- Department of Oral Oncology, Oral and Maxillofacial Surgery, Tokyo Dental College
| | | | - Takeshi Nomura
- Department of Oral Oncology, Oral and Maxillofacial Surgery, Tokyo Dental College
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Kasahara M, Matsunaga S, Someya T, Kitamura K, Odaka K, Ishimoto T, Nakano T, Abe S, Hattori M. Micro- and nano-bone analyses of the human mandible coronoid process and tendon-bone entheses. J Biomed Mater Res B Appl Biomater 2020; 108:2799-2806. [PMID: 32190994 DOI: 10.1002/jbm.b.34609] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 03/03/2020] [Accepted: 03/08/2020] [Indexed: 11/07/2022]
Abstract
The coronoid process provides attachment to temporalis and masseter muscles, and thus plays an important role in mastication. Tendons connect muscles and bones, mediating the transmission of functional loads to bones. Thus, tendon-bone entheses govern mechanical stress in bones. The preferential orientation of biological apatite (BAp) crystallites, the main mineral component in bones, is an important index for bone quality and function, and is largely influenced by locally applied stress. In this study, we analyzed BAp orientation, Young's modulus, and bone mineral density (BMD) at different sites in the human coronoid process. No differences in BMD were found among the analyzed sites, but BAp crystal orientation was observed to differ. BAp crystallites showed a uni-directional orientation in the mesiodistal direction at the coronoid process apex, but were oriented in the direction vertical to the occlusal plane at other sites. Young's modulus tended to vary according to the BAp orientation. At the apex, a tendon form with characteristics different from those at other sites, including the presence of a fibrocartilaginous layer that may act as a stretching brake to control stress concentration, was observed. These findings suggest that the functional pressure of the temporalis muscle affects bone quality and strength.
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Affiliation(s)
- Masaaki Kasahara
- Department of Dental Materials Science, Tokyo Dental College, Tokyo, Japan.,Oral Health Science Center, Tokyo Dental College, Tokyo, Japan
| | - Satoru Matsunaga
- Oral Health Science Center, Tokyo Dental College, Tokyo, Japan.,Department of Anatomy, Tokyo Dental College, Tokyo, Japan
| | - Tomoko Someya
- Department of Dental Materials Science, Tokyo Dental College, Tokyo, Japan
| | - Kei Kitamura
- Oral Health Science Center, Tokyo Dental College, Tokyo, Japan.,Department of Histology and Developmental Biology, Tokyo, Japan
| | - Kento Odaka
- Oral Health Science Center, Tokyo Dental College, Tokyo, Japan.,Department of Oral and Maxillofacial Radiology, Tokyo Dental College, Tokyo, Japan
| | - Takuya Ishimoto
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Takayoshi Nakano
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Shinichi Abe
- Department of Anatomy, Tokyo Dental College, Tokyo, Japan
| | - Masayuki Hattori
- Department of Dental Materials Science, Tokyo Dental College, Tokyo, Japan
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Nakajima K, Matsunaga S, Morioka T, Nakano T, Abe S, Furuya Y, Yajima Y. Effects of unloading by tail suspension on biological apatite crystallite alignment in mouse femur. Dent Mater J 2020; 39:670-677. [PMID: 32037388 DOI: 10.4012/dmj.2019-187] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was clarify the effects of reducing various functional pressures essential for the maintenance of bone homeostasis. Femoral bone mineral density (BMD) and biological apatite (BAp) crystallite alignment were measured in conventionally reared and hindlimb-unloaded mice. The femur was divided into 10 equal segments perpendicular to the longitudinal axis of the bone and measurements were performed on the cortical bone in the five segments closest to the midpoint of the femur. Significantly lower BMD and BAp alignment in the longitudinal (Z-axis) direction were observed in the hindlimb-unloaded group. The present findings suggest that unloading by tail suspension significantly decreases not only mouse femoral bone mass but also BAp crystallite alignment, although minimal uniaxial preferential alignment is retained.
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Affiliation(s)
- Kosuke Nakajima
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College.,Oral Health Science Center, Tokyo Dental College
| | - Satoru Matsunaga
- Oral Health Science Center, Tokyo Dental College.,Department of Anatomy, Tokyo Dental College
| | - Toshiyuki Morioka
- Oral Health Science Center, Tokyo Dental College.,Department of Removable Partial Prosthodontics, Tokyo Dental College
| | - Takayoshi Nakano
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
| | - Shinichi Abe
- Oral Health Science Center, Tokyo Dental College.,Department of Anatomy, Tokyo Dental College
| | - Yoshitaka Furuya
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College.,Oral Health Science Center, Tokyo Dental College
| | - Yasutomo Yajima
- Department of Oral and Maxillofacial Implantology, Tokyo Dental College.,Oral Health Science Center, Tokyo Dental College
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