Abstract
Temporary orthodontic mini implants serve as anchorage devices in orthodontic treatments. Often, they are inserted in the jaw bones, between the roots of the teeth. The stability of the mini implants within the bone is one of the major factors affecting their success and, consequently, that of the orthodontic treatment. Bone mechanical properties are important for implant stability. The aim of this study was to determine the tensile properties of the alveolar and basal mandible bones in a swine model. The diametral compression test was employed to study the properties in two orthogonal directions: mesio-distal and occluso-gingival. Small cylindrical cortical bone specimens (2.6 mm diameter, 1.5 mm thickness) were obtained from 7 mandibles using a trephine drill. The sites included different locations (anterior and posterior) and aspects (buccal and lingual) for a total of 16 specimens from each mandible. The load-displacement curves were continuously monitored while loading half of the specimens in the oclluso-gingival direction and half in the mesio-distal direction. The stiffness was calculated from the linear portion of the curve. The mesio-distal direction was 31% stiffer than the occluso-gingival direction. The basal bone was 40% stiffer than the alveolar bone. The posterior zone was 46% stiffer than the anterior zone. The lingual aspect was stiffer than the buccal aspect. Although bone specimens do not behave as brittle materials, the diametral compression test can be adequately used for determining tensile behavior when only small bone specimens can be obtained. In conclusion, to obtain maximal orthodontic mini implant stability, the force components on the implants should be oriented mostly in the mesio-distal direction.
Highlights
IntroductionThe mandible is a unique bone that differs from long bones in that it has a U-shaped geometry and is connected to the skull bilaterally
In orthodontic treatments, during which non-functional forces are applied to teeth to relocate them, the bones react to these forces by resorption and apposition that maintain the teeth in their new locations
Like dentin, does not behave as a brittle material, in this study, the dependent variable will be the stiffness during initial loading of the cortical bone of the specimens obtained from the small interradicular sites rather than the tensile strength
Summary
The mandible is a unique bone that differs from long bones in that it has a U-shaped geometry and is connected to the skull bilaterally. It is divided into two parts: the upper bone, which is the alveolar ridge that anchors the teeth, and the lower basal (BAS) bone, the inferior part of which is more condensed and defines the lower border [3]. The jaw bones have to resist natural functional activities, but very often they are subjected to iatrogenic-induced loadings through dental implants and/or artificial dentures replacing missing teeth. In orthodontic treatments, during which non-functional forces are applied to teeth to relocate them, the bones react to these forces by resorption and apposition that maintain the teeth in their new locations
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
