{"id":{"repo_id":"uwo","oai_identifier":"oai:uwo.scholaris.ca:20.500.14721/37243"},"canonical_url":"https://search.dev.ndltd.org/etd/uwo/oai:uwo.scholaris.ca:20.500.14721/37243","repository":{"repo_id":"uwo","name":"Western University","base_url":"https://uwo.scholaris.ca/server/oai/request"},"display":{"title":"An In-Vitro Study Evaluating the Fracture Resistance and Insertion Torque of Self-Drilling Mini-Implants Upon Insertion Into Synthetic High Density Mandibular Bone.","abstract":"Introduction: Self-drilling mini-implants are commonly used in orthodontics, but there is little information regarding their fracture resistance in areas of high density bone without pre-drilling. Purpose: To determine the peak fracture torques of six commonly used self-drilling mini-implants, and to examine how each performs in extreme conditions without pre-drilling. Materials and Methods: Fifteen mini-implants from six different manufacturers were drilled into acrylic blocks using a custom-made insertion device incorporating a 6-DOF load cell for torque measurements. Peak fracture torques were recorded and compared for each of the six manufacturers. Additionally, ten mini-implants from each manufacturer were inserted into high density mandibular bone substitutes (Sawbones®) without pre-drilling. Measures of peak insertion torque for each manufacturer were recorded. Groups that experienced fracture upon insertion into the bone substitutes underwent further testing specifically following their manufacturer pre-drilling recommendations. Results: Resistance to fracture varied significantly among implants from different manufacturers. Tomas-pin and Aarhus experienced fractures during insertion into the non-pre-drilled bone substitutes. When manufacturer’s pre-drilling recommendations were followed, Aarhus continued to experience fractures during insertion. Conclusions: Unitek, Vector TAS, Dual Top, and Ortho Easy can be inserted into areas of thick and dense cortical bone without pre-drilling. Tomas-Pin can be inserted provided manufacturer pre-drilling recommendations are followed. The manufacturer's recommendations for the use of 1.5mm Aarhus in areas of thick cortical bone may need to be modified.","abstract_html":"Introduction: Self-drilling mini-implants are commonly used in orthodontics, but there is little information regarding their fracture resistance in areas of high density bone without pre-drilling. Purpose: To determine the peak fracture torques of six commonly used self-drilling mini-implants, and to examine how each performs in extreme conditions without pre-drilling. Materials and Methods: Fifteen mini-implants from six different manufacturers were drilled into acrylic blocks using a custom-made insertion device incorporating a 6-DOF load cell for torque measurements. Peak fracture torques were recorded and compared for each of the six manufacturers. Additionally, ten mini-implants from each manufacturer were inserted into high density mandibular bone substitutes (Sawbones®) without pre-drilling. Measures of peak insertion torque for each manufacturer were recorded. Groups that experienced fracture upon insertion into the bone substitutes underwent further testing specifically following their manufacturer pre-drilling recommendations. Results: Resistance to fracture varied significantly among implants from different manufacturers. Tomas-pin and Aarhus experienced fractures during insertion into the non-pre-drilled bone substitutes. When manufacturer’s pre-drilling recommendations were followed, Aarhus continued to experience fractures during insertion. Conclusions: Unitek, Vector TAS, Dual Top, and Ortho Easy can be inserted into areas of thick and dense cortical bone without pre-drilling. Tomas-Pin can be inserted provided manufacturer pre-drilling recommendations are followed. The manufacturer's recommendations for the use of 1.5mm Aarhus in areas of thick cortical bone may need to be modified.","abstract_has_math":false,"creators":["Smith, Angie L"],"institution":"The University of Western Ontario","degree_name":"M Sc","degree_level":null,"degree_discipline":"Orthodontics","degree_department":null,"school":null,"contributors":[],"advisors":["Tassi, Ali"],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-11-06","date_published":"2013-11-06","updated_at":"2026-07-27T21:55:58Z","subjects":["Orthodontic","anchorage","mini-implant","miniscrew","TAD","temporary anchorage device","fracture","insertion torque","pre-drilling","pilot-hole","high density bone","mandibular bone","cortical bone thickness."],"languages":["en_ca"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/20.500.14721/37243","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Tassi, Ali"]},{"key":"dc:creator","label":"Author","values":["Smith, Angie L"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-07-10T21:32:38Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-07-10T21:32:38Z"]},{"key":"dc:date.issued","label":"Date","values":["2013-11-06"]},{"key":"dc:publisher","label":"Institution","values":["The University of Western Ontario"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Orthodontics"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M Sc"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Orthodontic","anchorage","mini-implant","miniscrew","TAD","temporary anchorage device","fracture","insertion torque","pre-drilling","pilot-hole","high density bone","mandibular bone","cortical bone thickness."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_ca"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/20.500.14721/37243"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."]},{"key":"dc:description.abstract","label":"Abstract","values":["Introduction: Self-drilling mini-implants are commonly used in orthodontics, but there is little information regarding their fracture resistance in areas of high density bone without pre-drilling. Purpose: To determine the peak fracture torques of six commonly used self-drilling mini-implants, and to examine how each performs in extreme conditions without pre-drilling. Materials and Methods: Fifteen mini-implants from six different manufacturers were drilled into acrylic blocks using a custom-made insertion device incorporating a 6-DOF load cell for torque measurements. Peak fracture torques were recorded and compared for each of the six manufacturers. Additionally, ten mini-implants from each manufacturer were inserted into high density mandibular bone substitutes (Sawbones®) without pre-drilling. Measures of peak insertion torque for each manufacturer were recorded. Groups that experienced fracture upon insertion into the bone substitutes underwent further testing specifically following their manufacturer pre-drilling recommendations. Results: Resistance to fracture varied significantly among implants from different manufacturers. Tomas-pin and Aarhus experienced fractures during insertion into the non-pre-drilled bone substitutes. When manufacturer’s pre-drilling recommendations were followed, Aarhus continued to experience fractures during insertion. Conclusions: Unitek, Vector TAS, Dual Top, and Ortho Easy can be inserted into areas of thick and dense cortical bone without pre-drilling. Tomas-Pin can be inserted provided manufacturer pre-drilling recommendations are followed. The manufacturer's recommendations for the use of 1.5mm Aarhus in areas of thick cortical bone may need to be modified."]},{"key":"dc:title","label":"Title","values":["An In-Vitro Study Evaluating the Fracture Resistance and Insertion Torque of Self-Drilling Mini-Implants Upon Insertion Into Synthetic High Density Mandibular Bone."]}]}],"canonical_facts":{"dc:contributor.advisor":["Tassi, Ali"],"dc:creator":["Smith, Angie L"],"dc:date.accessioned":["2025-07-10T21:32:38Z"],"dc:date.available":["2025-07-10T21:32:38Z"],"dc:date.issued":["2013-11-06"],"dc:description":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."],"dc:description.abstract":["Introduction: Self-drilling mini-implants are commonly used in orthodontics, but there is little information regarding their fracture resistance in areas of high density bone without pre-drilling. Purpose: To determine the peak fracture torques of six commonly used self-drilling mini-implants, and to examine how each performs in extreme conditions without pre-drilling. Materials and Methods: Fifteen mini-implants from six different manufacturers were drilled into acrylic blocks using a custom-made insertion device incorporating a 6-DOF load cell for torque measurements. Peak fracture torques were recorded and compared for each of the six manufacturers. Additionally, ten mini-implants from each manufacturer were inserted into high density mandibular bone substitutes (Sawbones®) without pre-drilling. Measures of peak insertion torque for each manufacturer were recorded. Groups that experienced fracture upon insertion into the bone substitutes underwent further testing specifically following their manufacturer pre-drilling recommendations. Results: Resistance to fracture varied significantly among implants from different manufacturers. Tomas-pin and Aarhus experienced fractures during insertion into the non-pre-drilled bone substitutes. When manufacturer’s pre-drilling recommendations were followed, Aarhus continued to experience fractures during insertion. Conclusions: Unitek, Vector TAS, Dual Top, and Ortho Easy can be inserted into areas of thick and dense cortical bone without pre-drilling. Tomas-Pin can be inserted provided manufacturer pre-drilling recommendations are followed. The manufacturer's recommendations for the use of 1.5mm Aarhus in areas of thick cortical bone may need to be modified."],"dc:identifier.uri":["https://hdl.handle.net/20.500.14721/37243"],"dc:language.iso":["en_ca"],"dc:publisher":["The University of Western Ontario"],"dc:subject":["Orthodontic","anchorage","mini-implant","miniscrew","TAD","temporary anchorage device","fracture","insertion torque","pre-drilling","pilot-hole","high density bone","mandibular bone","cortical bone thickness."],"dc:title":["An In-Vitro Study Evaluating the Fracture Resistance and Insertion Torque of Self-Drilling Mini-Implants Upon Insertion Into Synthetic High Density Mandibular Bone."],"dc:type":["thesis"],"thesis:degree_discipline":["Orthodontics"],"thesis:degree_name":["M Sc"]},"updated_at":"2026-07-27T21:55:58Z"}