Objective: To evaluate the primary stability of different shaped miniscrews through the acquisition of data regarding maximum insertion torque, pullout force, and a radiodiagnosic evaluation of bone characteristics. Materials and methods: Sixty fresh porcine bone samples were scanned by computed tomography (CT) and cone-beam computed tomography (CBCT). By means of a dedicated software, CT and CBCT images were analysed to measure the insertion-site cortical thickness, cortical density, and marrow bone density. Sixty miniscrews of 12 different types were implanted with no predrilling pilot hole in the bone samples. Every device was tightened by means of a digital torque screwdriver and torque data were collected. Subsequently, pullout tests were performed. Spearman and Pearson correlations were employed to compare any relationship between continuous variables. Results: Different types of miniscrews did not show statistically significant differences in their torque value (P = 0.595), instead a significant difference was revealed by considering their load measures (P = 0.039). Cortical bone thickness resulted strongly correlated both with value of load (P < 0.001), and modestly with torque measures (P = 0.004). A strong positive correlation was found between CT and CBCT both for cortical density (P < 0.001) and marrow bone density (P < 0.001). Conclusion: Bone characteristics play the major role in miniscrews primary stability.

Orthodontic miniscrews: An experimental campaign on primary stability and bone properties

MIGLIORATI, MARCO;SCHIAVETTI, IRENE;BARBERIS, FABRIZIO;LAGAZZO, ALBERTO;CAPURRO, PIETRO MARCO;SILVESTRINI BIAVATI, ARMANDO;BENEDICENTI, STEFANO
2015-01-01

Abstract

Objective: To evaluate the primary stability of different shaped miniscrews through the acquisition of data regarding maximum insertion torque, pullout force, and a radiodiagnosic evaluation of bone characteristics. Materials and methods: Sixty fresh porcine bone samples were scanned by computed tomography (CT) and cone-beam computed tomography (CBCT). By means of a dedicated software, CT and CBCT images were analysed to measure the insertion-site cortical thickness, cortical density, and marrow bone density. Sixty miniscrews of 12 different types were implanted with no predrilling pilot hole in the bone samples. Every device was tightened by means of a digital torque screwdriver and torque data were collected. Subsequently, pullout tests were performed. Spearman and Pearson correlations were employed to compare any relationship between continuous variables. Results: Different types of miniscrews did not show statistically significant differences in their torque value (P = 0.595), instead a significant difference was revealed by considering their load measures (P = 0.039). Cortical bone thickness resulted strongly correlated both with value of load (P < 0.001), and modestly with torque measures (P = 0.004). A strong positive correlation was found between CT and CBCT both for cortical density (P < 0.001) and marrow bone density (P < 0.001). Conclusion: Bone characteristics play the major role in miniscrews primary stability.
File in questo prodotto:
File Dimensione Formato  
2014-orthodontic miniscrew an experimental campaign- ejo-.pdf

accesso aperto

Descrizione: Advance Access publication 24 December 2014
Tipologia: Documento in versione editoriale
Dimensione 1.17 MB
Formato Adobe PDF
1.17 MB Adobe PDF Visualizza/Apri
11567-827639.pdf

accesso aperto

Tipologia: Documento in versione editoriale
Dimensione 5.38 MB
Formato Adobe PDF
5.38 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/827639
Citazioni
  • ???jsp.display-item.citation.pmc??? 4
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 13
social impact