Please use this identifier to cite or link to this item: https://doi.org/10.1054/ijom.2002.0367
Title: Bone response to unloaded titanium implants in the fibula, iliac crest, and scapula: An animal study in the Yorkshire pig
Authors: Rohner, D.
Meng, C.S.
Hutmacher, D.W. 
Tsai, K.T.
Keywords: Free vascularized flaps
Interfacial strength
Prefabrication
Removal torque
Titanium implants
Issue Date: Aug-2003
Source: Rohner, D., Meng, C.S., Hutmacher, D.W., Tsai, K.T. (2003-08). Bone response to unloaded titanium implants in the fibula, iliac crest, and scapula: An animal study in the Yorkshire pig. International Journal of Oral and Maxillofacial Surgery 32 (4) : 383-389. ScholarBank@NUS Repository. https://doi.org/10.1054/ijom.2002.0367
Abstract: The reconstruction of extended maxillary and mandibular defects with prefabricated free flaps is a two stage procedure, that allows immediate function with implant supported dentures. The appropriate delay between prefabrication and reconstruction depends on the interfacial strength of the bone implant surface. The purpose of this animal study was to evaluate the removal torque of unloaded titanium implants in the fibula, the scapula and the iliac crest. Ninety implants with a sandblasted and acid-etched (SLA) surface were tested after healing periods of 3, 6, and 12 weeks, respectively. Removal torque values (RTV) were collected using a computerized counterclockwise torque driver. The bicortical anchored 8 mm implants in the fibula revealed values of 63.73 Ncm, 91.50 Ncm, and 101.83 Ncm at 3, 6, and 12 weeks, respectively. The monocortical anchorage in the iliac crest showed values of 71.40 Ncm, 63.14 Ncm, and 61.59 Ncm with 12 mm implants at the corresponding times. The monocortical anchorage in the scapula demonstrated mean RTV of 62.28 Ncm, 97.63 Ncm, and 99.7 Ncm with 12 mm implants at 3, 6, and 12 weeks, respectively. The study showed an increase of removal torque with increasing healing time. The interfacial strength for bicortical anchored 8 mm implants in the fibula was comparable to monocortical anchored 12 mm implants in the iliac crest and the scapula at the corresponding times. The resistance to shear seemed to be determined by the type of anchorage (monocortical vs. bicortical) and the length of the implant with greater amount of bone-implant interface.
Source Title: International Journal of Oral and Maxillofacial Surgery
URI: http://scholarbank.nus.edu.sg/handle/10635/66951
ISSN: 09015027
DOI: 10.1054/ijom.2002.0367
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