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Biomed Res Int. 2018 May 31;2018:6758245. doi: 10.1155/2018/6758245. eCollection 2018.

Clinical Relevance of Bone Density Values from CT Related to Dental Implant Stability: A Retrospective Study.

Author information

Department of Biomedical and Specialty Surgical Sciences, Unit of Prosthesis, University of Ferrara, Via Borsari 46, 44121 Ferrara, Italy.
Department of Biomedical and Neuromotor Sciences, Unit of Periodontology and Implantology, University of Bologna, Via San Vitale 59, 40125 Bologna, Italy.
Private Practice, Vicolo Carceri 10, 10064 Pinerolo, Torino, Italy.
Department of Neuroscience, Reproductive Sciences and Odontostomatology, Unit of Oral Surgery and Implantology, University of Naples, Via Pansini 5, Edificio 14, 80131 Naples, Italy.
Department of Biomedical and Neuromotor Sciences, Unit of Orthodontics, University of Bologna, Via San Vitale 59, 40125 Bologna, Italy.



The majority of the techniques used to assess the primary implant stability are subjective and empirical and can be used during or after the surgery. The aim of this study is to evaluate the bone density prior to surgery, in order to give recommendations to the clinician about the best surgical technique and the type of implant which is needed.

Materials and Methods:

A surgeon operated on 75 patients for 269 implants over the period 2010-2014. He required a CT to plan the surgery and he documented the type, the diameters, and the lengths of the implants, the insertion torque, and the ISQ values. At a later stage another clinician measured bone density and cortical thickness. We endeavoured to get the most accurate superimposition between the implants placed by the surgeon and those placed by the clinician.


In maxilla ISQ showed a significant positive correlation with HU values detected for coronal-buccal (r = 0.302; p = 0.020) and middle-lingual (r = 0.295; p = 0.023). Torque showed a positive correlation with cortical bone thickness at the middle of the ridge (ρ = 0.196; p = 0.032).


It is important to take into consideration the Hounsfield Units and the cortical thickness as predictive parameters during the preoperative assessment, with regard to the choice of the implant type as well as the surgical technique.

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