Cortical Thickness, Bone Density, and the Insertion Torque/Depth Integral: A Study Using Polyurethane Foam Blocks

2021 ◽  
Vol 36 (3) ◽  
pp. 423-431
Author(s):  
Danilo Di Stefano ◽  
Adriano Piattelli ◽  
Giovanna Iezzi ◽  
Francesco Orlando ◽  
Paolo Arosio
Keyword(s):  
Bone Density ◽  
Polyurethane Foam ◽  
Cortical Thickness ◽  
Insertion Torque

Influence of the Geometric Characteristics of the Mini-Implants on Mechanicals Properties Using Artificial Bone Similar to Anterior, Middle and Posterior Regions of the Jaws

2018 ◽  
Vol 930 ◽  
pp. 276-282
Author(s):  
E.I.O. Pesqueira ◽  
Cristiano Stefano Mucsi ◽  
Jesualdo Luiz Rossi
Keyword(s):  
Bone Density ◽  
Cortical Thickness ◽  
Insertion Torque ◽  
Trabecular Thickness ◽  
Mini Implants ◽  
Torque Wrench ◽  
Artificial Bones ◽  
Before And After ◽  
Twin Screw ◽  
Torque Values

The objective of this study was to identify the best torque of insertion and removal of mini-implants with a twin screw design (compact and self-drilling) into artificial bones with density and trabecular thickness, similar to anterior, middle and posterior regions of the jaws. Observation of the mini-implants surface using electron microscopy was performed before and after the tests. The torque values obtained during the insertion and removal was measured by digital torque wrench. The analyzed results led to the conclusion that the insertion and removal torques were larger with increase in bone density and cortical thickness. The design of the threads of the mini-implants influenced the insertion torque. Threads with smaller pitch increased the value of insertion torque. The anterior bone drilling installation reduces the insertion torque independent of bone density. Torque increased mainly by increasing the bone density and not necessarily with increased cortical thickness suggesting that the bone density of the trabecular bone must be considered in designing the installation of mini-implants.

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

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Vincenzo Bruno ◽  
Cesare Berti ◽  
Carlo Barausse ◽  
Mauro Badino ◽  
Roberta Gasparro ◽  
...  
Keyword(s):  
Bone Density ◽  
Surgical Technique ◽  
Cortical Thickness ◽  
Preoperative Assessment ◽  
Insertion Torque ◽  
Implant Stability ◽  
Bone Thickness ◽  
Positive Correlation ◽  
Predictive Parameters ◽  
Density Values

Purpose. 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. Results. 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). Conclusion. 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.

A THEORETICAL ITERATION FOR PREDICTING THE FEASIBILITY FOR IMMEDIATE FUNCTIONAL DENTAL IMPLANT LOADING

2020 ◽  
Author(s):  
Dennis Flanagan ◽  
Alessandro Fisher BS ◽  
Carmen Ciardiello ◽  
Vito Moreno ◽  
Alen Uvalic ◽  
...  
Keyword(s):  
Bone Density ◽  
Dental Implant ◽  
Cortical Thickness ◽  
Load Capacity ◽  
Functional Load ◽  
Implant Crown ◽  
Technical Issues ◽  
Implant Loading ◽  
Influential Parameters ◽  
Functional Loading

When planning an implant supported restoration the dentist is faced with the surgical and prosthetic technical issues as well as the patient’s expectations. Many patients wish an immediate solution to an edentulous condition. This is especially may be true in the esthetic zone. The extent of the zone is determined by the patient. The dentist may consider when it is feasible to load the supporting implants with definitive or provisional prosthetics. For the work herein, consideration of many parameters were theoretically assessed for inclusion: bone density, cortical thickness, seating torque, parafunction, bite load capacity, number of implants under load, implant/crown ratio, implant diameter and length. After assessment, the most influential parameters were selected. An iteration, using patient age, implant diameter, bite load capacity and cortical thickness, is now presented to aid the implant dentist in determining the feasibility for immediate functional loading of a just placed dental implant in a healed site. Extensive testing is required to develop this concept. According to this iteration, most immediate functional loaded implants would fail. A future refined and definitive formula may enable the clinician to safely immediately functional load an implant with a definitive prosthesis.

scholarly journals How Do Parameters of Implant Primary Stability Correspond with CT-Evaluated Bone Quality in the Posterior Maxilla? A Correlation Analysis

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 270
Author(s):  
Ji-Hyun Kim ◽  
Young-Jun Lim ◽  
Bongju Kim ◽  
Jungwon Lee
Keyword(s):  
Bone Density ◽  
Bone Quality ◽  
Objective Assessment ◽  
Primary Stability ◽  
Insertion Torque ◽  
Hounsfield Units ◽  
Stability Parameters ◽  
Posterior Maxilla ◽  
Different Types ◽  
Edentulous Patients

The aim of the present study was to evaluate correlations between bone density and implant primary stability, considering various determinants such as age, gender, and geometry of implants (design, diameter). Bone density of edentulous posterior maxillae was assessed by computed tomography (CT)-derived Hounsfield units, and implant primary stability values were measured with insertion torque and resonance frequency analysis (RFA). A total of 60 implants in 30 partially edentulous patients were evaluated in the posterior maxilla with two different types of dental implants. The bone density evaluated by CT-derived Hounsfield units showed a significant correlation with primary stability parameters. The bone quality was more influenced by gender rather than age, and the type of implant was insignificant when determining primary stability. Such results imply that primary stability parameters can be used for objective assessment of bone quality, allowing surgical modifications especially in sites suspected of poor bone quality.

scholarly journals SAT-LB088 Assessing Metacarpal Cortical Thickness as a Tool to Evaluate Bone Density Compared to DXA in Osteogenesis Imperfecta

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Nadia Merchant ◽  
Nishitha Pillai ◽  
Chase Miller ◽  
Trevor Hadley ◽  
Lefkothea Karaviti ◽  
...  
Keyword(s):  
Bone Density ◽  
Osteogenesis Imperfecta ◽  
Cortical Thickness

Evaluation of cortical thickness and bone density by roentgen microdensitometry in growing males and females

1996 ◽  
Vol 155 (5) ◽  
pp. 377-382 ◽  
Author(s):  
Nicoletta Zamberlan ◽  
Giorgio Radetti ◽  
Claudio Paganini ◽  
Davide Gatti ◽  
Maurizio Rossini ◽  
...  
Keyword(s):  
Bone Density ◽  
Cortical Thickness ◽  
Males And Females

scholarly journals Osseodensification Drilling vs. Standard Protocol of Implant Site Preparation: An In Vitro Study on Polyurethane Foam Sheets

Prosthesis ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 76-86
Author(s):  
Luca Comuzzi ◽  
Margherita Tumedei ◽  
Adriano Piattelli ◽  
Giovanna Iezzi
Keyword(s):  
Polyurethane Foam ◽  
Cortical Layer ◽  
Polyurethane Foams ◽  
Insertion Torque ◽  
Standard Type ◽  
Removal Torque ◽  
In Vitro Investigation ◽  
Posterior Maxilla ◽  
And Control

(1) Background: The aim of the present in vitro investigation was to evaluate, on polyurethane sheets, two different drilling techniques for dental implant positioning using osteocondensing burs compared to a standard type protocol. (2) Methods: Three different implant designs (Implacil De Bortoli UN III 4 × 10 mm, Restore RBM 4 (HEX) × 10 mm; Implacil De Bortoli UN II 4 × 10 mm) were evaluated (test implant (osteocondensing drills) and control implant (standard drills)). The insertion torque (IT), the removal torque (RT) and the resonance frequency analysis (RFA) values of test and control implants inserted in different size and different density polyurethane foam models were compared for 120 experimental sites. Accordingly, 120 experimental holes were produced in different PCF polyurethane foams: 60 sites were produced in 10 PCF sheets and 60 sites in 10 PCF sheets with an additional 1 mm layer of 30 PCF. (3) Results: The IT, removal torque and RFA values were significantly higher for both of the evaluated implants, in the sites prepared with the osteocondenser drills when compared to sites prepared with standard drills (p < 0.05). The UNII and UN III showed significantly higher stability compared to the HEX implant; these differences increased drastically in the 10 PCF Polyurethane Block with the additional 1 mm cortical layer (p < 0.05). (4) Conclusions: The outcome of this investigation suggested a possible clinical application of osteocondensing burs in case of reduced bone quality and quantity in the posterior maxilla.

scholarly journals Primary Stability Optimization by Using Fixtures with Different Thread Depth According To Bone Density: A Clinical Prospective Study on Early Loaded Implants

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2398 ◽  
Author(s):  
Christian Makary ◽  
Abdallah Menhall ◽  
Carole Zammarie ◽  
Teresa Lombardi ◽  
Seung Yeup Lee ◽  
...  
Keyword(s):  
Bone Density ◽  
Primary Stability ◽  
Stability Loss ◽  
Insertion Torque ◽  
Implant Stability ◽  
Marginal Bone Loss ◽  
Early Loading ◽  
Bone Level ◽  
Implant Therapy ◽  
Provisional Restoration

Background: Macro- and micro-geometry are among the factors influencing implant stability and potentially determining loading protocol. The purpose of this study was to test a protocol for early loading by controlling implant stability with the selection of fixtures with different thread depth according to the bone density of the implant site. Materials and Methods: Patients needing implant therapy for fixed prosthetic rehabilitation were treated by inserting fixtures with four different thread diameters, selected based on clinical assessment of bone quality at placement (D1, D2, D3, and D4, according to Misch classification). Final insertion torque (IT) and implant stability quotient (ISQ) were recorded at baseline and ISQ measurements repeated after one, two, three, and four weeks. At the three-week measurement (four weeks after implant replacement), implants with ISQ > 70 Ncm were functionally loaded with provisional restorations. Marginal bone level was radiographically measured 12 months after implant insertion. Results: Fourteen patients were treated with the insertion of forty implants: Among them, 39 implants showing ISQ > 70 after 3 weeks of healing were loaded with provisional restoration. Mean IT value was 82.3 ± 33.2 Ncm and varied between the four different types of bone (107.2 ± 35.6 Ncm, 74.7 ± 14.0 Ncm, 76.5 ± 31.1 Ncm, and 55.2 ± 22.6 Ncm in D1, D2, D3, and D4 bone, respectively). Results showed significant differences except between D2 and D3 bone types. Mean ISQ at baseline was 79.3 ± 4.3 and values in D1, D2, D3, and D4 bone were 81.9 ± 2.0, 81.1 ± 1.0, 78.3 ± 3.7, and 73.2 ± 4.9, respectively. Results showed significant differences except between D1 and D2 bone types. IT and ISQ showed a significant positive correlation when analyzing the entire sample (p = 0.0002) and D4 bone type (p = 0.0008). The correlation between IT and ISQ was not significant when considering D1, D2, and D3 types (p = 0.28; p = 0.31; p = 0.16, respectively). ISQ values showed a slight drop at three weeks for D1, D2, and D3 bone while remaining almost unchanged in D4 bone. At 12-month follow-up, all implants (39 early loading, 1 conventional loading) had satisfactory function, showing an average marginal bone loss of 0.12 ± 0.12 mm, when compared to baseline levels. Conclusion: Matching implant macro-geometry to bone density can lead to adequate implant stability both in hard and soft bone. High primary stability and limited implant stability loss during the first month of healing could allow the application of early loading protocols with predictable clinical outcomes.

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