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 EFFECT OF ANGLED INSTALLATION OF ORTHODONTIC MINI-IMPLANTS ON PRIMARY STABILITY

2014 ◽  
Vol 2 (2) ◽  
pp. 169
Author(s):  
Fabiana Padovan Di Lello ◽  
Flávia Regina Vergamine Salles Sgarbi ◽  
Eloisa Marcantonio Boeck ◽  
Nadia Lunardi ◽  
Rodolfo Jorge Boeck Neto
Keyword(s):  
Bone Density ◽  
Cortical Bone ◽  
Primary Stability ◽  
Insertion Torque ◽  
Medullary Bone ◽  
Removal Torque ◽  
Synthetic Bone ◽  
Whitney Test ◽  
Mini Implants ◽  
Torque Wrench

AIM: The aim of this work was evaluate the insertion and removal torque for orthodontic mini-implants inserted in different inclination. MATERIALS AND METHODS: Ten self-drilling mini-implants from the brand SIN (Sistema de Implantes Nacional, São Paulo/SP, Brazil), and the surgical kit for their insertion were used. Two plaques of synthetic bone of 120 mm x 170 mm x 41,5 mm were used (Sawbones, Pacific Research Laboratories Inc, Vashon, Wash), with 1,5 mm height, simulating the cortical bone (density 40 pcf) and 40 mm simulating the medullary bone (density 15 pcf). In each block, five areas were demarcated for each mark, totalizing ten areas. The ten mini-implants were inserted by the same operator, previously calibrated; five of them at 900 and five at 600, using the manual key kit. After the insertion of all the mini-implants, the final threading and the reading of insertion torque value were carried out with a manual torque wrench digital Lutron TQ-8800 (Lutron Electronic Enterprise Co., Ltd, Taipei, Taiwan) until the trans-mucosal profile achieve the cortical bone. The maximum insertion torque value was registered in N/cm. After all the implants inserted, the measurement of removal torque was started, performed in the same way of insertion, but in the opposite anticlockwise. The results were submitted to the T test (parametric) and to a Mann-Whitney test (non-parametric). RESULTS: The results demonstrated that the insertion torque was lower than the removal one in both insertion degrees, with statistically significance. Despite insertion torque at 90 degrees had been lightly higher than that inserted at 60 degrees, they were not statistically significant. CONCLUSION: In view of the results, it was possible conclude that insertion at 60º angulation does not offer advantages to the primary stability for orthodontic mini-implants.

scholarly journals Insertion torque versus mechanical resistance of mini- implants inserted in different cortical thickness

2014 ◽  
Vol 19 (3) ◽  
pp. 90-94 ◽  
Author(s):  
Renata de Faria Santos ◽  
Antonio Carlos de Oliveira Ruellas ◽  
Daniel Jogaib Fernandes ◽  
Carlos Nelson Elias
Keyword(s):  
Surface Morphology ◽  
Cortical Thickness ◽  
Smooth Surface ◽  
Mechanical Tests ◽  
Sem Analysis ◽  
Mechanical Resistance ◽  
Insertion Torque ◽  
Mini Implants ◽  
Before And After ◽  
Torsional Fracture

OBJECTIVE: This study aimed to measure insertion torque, tip mechanical resistance to fracture and transmucosal neck of mini-implants (MI) (Conexão Sistemas de PróteseT), as well as to analyze surface morphology. METHODS: Mechanical tests were carried out to measure the insertion torque of MIs in different cortical thicknesses, and tip mechanical resistance to fracture as well as transmucosal neck of MIs. Surface morphology was assessed by scanning electron microscopy (SEM) before and after the mechanical tests. RESULTS: Values of mechanical resistance to fracture (22.14 N.cm and 54.95 N.cm) were higher and statistically different (P < 0.05) from values of insertion torque for 1-mm (7.60 N.cm) and 2-mm (13.27 N.cm) cortical thicknesses. Insertion torque was statistically similar (P > 0.05) to torsional fracture in the tip of MI (22.14 N.cm) when 3 mm cortical thickness (16.11 N.cm) and dense bone (23.95 N.cm) were used. Torsional fracture of the transmucosal neck (54.95 N.cm) was higher and statistically different (P < 0.05) from insertion torsional strength in all tested situations. SEM analysis showed that the MIs had the same smooth surface when received from the manufacturer and after the mechanical tests were performed. Additionally, no significant marks resulting from the manufacturing process were observed. CONCLUSION: All mini-implants tested presented adequate surface morphology. The resistance of mini-implants to fracture safely allows placement in 1 and 2-mm cortical thickness. However, in 3-mm cortical thickness and dense bones, pre-drilling with a bur is recommended before insertion.

Insertion torque values and success rates for paramedian insertion of orthodontic mini-implants

2018 ◽  
Vol 79 (2) ◽  
pp. 109-115 ◽  
Author(s):  
Bruno Di Leonardo ◽  
Björn Ludwig ◽  
Jörg Alexander Lisson ◽  
Luca Contardo ◽  
Rossano Mura ◽  
...  
Keyword(s):  
Insertion Torque ◽  
Success Rates ◽  
Mini Implants ◽  
Torque Values

scholarly journals Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3205 ◽  
Author(s):  
Seen-Young Kang ◽  
Ji-Min Yu ◽  
Hyoung-Sik Kim ◽  
Jun-Seok Lee ◽  
Chan-Mi Yeon ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Automatic Device ◽  
Insertion Torque ◽  
Artificial Bone ◽  
Artificial Bones ◽  
Significant Difference ◽  
The Mean ◽  
The Stability ◽  
Torque Values

This study aims to compare the torque values for various lengths of the titanium-based orthodontic anchor screw (OAS), different anchorage methods and varying artificial bone densities after predrilling. Furthermore, the effects of these parameters on bone stability are evaluated. A total of 144 OASs were prepared with a diameter of 1.6 mm and heights of 6, 8 and 10 mm. Artificial bones were selected according to their density, corresponding to Grades 50, 40 and 30. Torque values for the automatic device and manual anchorage methods exhibited a statistically significant difference for the same-sized OAS, according to the bone density of the artificial bones (p < 0.05). However, when insertion torque was at the maximum rotations, there was no significant difference in the torque values for the Grade 30 artificial bone (p > 0.05). When the torque values of both anchorage methods were statistically compared with the mean difference for each group, the results of the manual anchorage method were significantly higher than those of the automatic device anchorage method (p < 0.05). A statistically significant difference was observed in the bone stability resulting from different OAS anchorage methods and artificial bone lengths. These findings suggest that the automatic anchorage method should be used when fixing the OAS.

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

scholarly journals Is trabecular bone related to primary stability of miniscrews?

2013 ◽  
Vol 84 (3) ◽  
pp. 500-507 ◽  
Author(s):  
Mariana Marquezan ◽  
Inayá Lima ◽  
Ricardo Tadeu Lopes ◽  
Eduardo Franzotti Sant'Anna ◽  
Margareth Maria Gomes de Souza
Keyword(s):  
Trabecular Bone ◽  
Cortical Bone ◽  
Cortical Thickness ◽  
Primary Stability ◽  
Pelvic Bone ◽  
Insertion Torque ◽  
Trabecular Thickness ◽  
Pull Out ◽  
Intergroup Comparison ◽  
Trabecular Number

ABSTRACT Objective: To compare the primary stability of miniscrews inserted into bone blocks of different bone mineral densities (BMDs) with and without cortical bone, and investigate whether some trabecular properties could influence primary stability. Materials and Methods: Fifty-two bone blocks were extracted from fresh bovine pelvic bone. Four groups were created based on bone type (iliac or pubic region) and presence or absence of cortical bone. Specimens were micro-computed tomography imaged to evaluate trabecular thickness, trabecular number, trabecular separation, bone volume density (BV/TV), BMD, and cortical thickness. Miniscrews 1.4 mm in diameter and 6 mm long were inserted into the bone blocks, and primary stability was evaluated by insertion torque (IT), mini-implant mobility (PTV), and pull-out strength (PS). Results: Intergroup comparison showed lower levels of primary stability when the BMD of trabecular bone was lower and in the absence of cortical bone (P ≤ .05). The Pearson correlation test showed correlation between trabecular number, trabecular thickness, BV/TV, trabecular BMD, total BMD, and IT, PTV, and PS. There was correlation between cortical thickness and IT and PS (P ≤ .05). Conclusion: Cancellous bone plays an important role in primary stability of mini-implants in the presence or absence of cortical bone.

scholarly journals Insertion Angle Impact on Primary Stability of Orthodontic Mini-Implants

2008 ◽  
Vol 78 (6) ◽  
pp. 1065-1070 ◽  
Author(s):  
Benedict Wilmes ◽  
Yu-Yu Su ◽  
Dieter Drescher
Keyword(s):  
Bone Quality ◽  
Primary Stability ◽  
Insertion Torque ◽  
Insertion Angle ◽  
Oblique Direction ◽  
Mini Implants ◽  
Local Bone ◽  
Torque Values ◽  
The Impact ◽  
Root Contact

Abstract Objective: To analyze the impact of the insertion angle on the primary stability of mini-implants. Materials and Methods: A total of 28 ilium bone segments of pigs were embedded in resin. Two different mini-implant sizes (Dual-Top Screw 1.6 × 8 mm and 2.0 × 10 mm) were inserted at seven different angles (30°, 40°, 50°, 60°, 70°, 80°, and 90°). The insertion torque was recorded to assess primary stability. In each bone, five Dual-Top Screws were used to compensate for differences in local bone quality. Results: The angle of mini-implant insertion had a significant impact on primary stability. The highest insertion torque values were measured at angles between 60° and 70° (63.8° for Dual-Top 1.6 mm and 66.7° for Dual-Top 2.0 mm). Very oblique insertion angles (30°) resulted in reduced primary stability. Conclusions: To achieve the best primary stability, an insertion angle ranging from 60° to 70° is advisable. If the available space between two adjacent roots is small, a more oblique direction of insertion seems to be favorable to minimize the risk of root contact.

Estabilidade primária do implante dental

2020 ◽  
Vol 12 (45) ◽  
pp. 67-71
Author(s):  
Elidio Rodrigues Neto ◽  
Pedro Henrique Ribeiro Arantes ◽  
Marcelo Guerino Pereira Couto ◽  
Nasser Hussein Fares ◽  
Mario Pereira Couto Neto
Keyword(s):  
Bone Density ◽  
Surgical Technique ◽  
Primary Stability ◽  
Implant Design ◽  
Insertion Torque ◽  
Poor Bone Quality ◽  
Torque Values ◽  
Clinical Determination

Primary stability derives mainly from mechanical involvement with the cortical bone and the lack of mobility in the bone bed at the insertion of the implant and depends on the quantity and quality of the bone, the surgical technique, and the design of the implant. The titles were captured in the database PubMed, Scielo, and relevant Brazilian magazines to identify the primary stability, after the insertion of the implant in the region indicated in the protocol. Tapered implants showed greater primary stability compared to cylindrical implants, when placed under bone density conditions. The geometry of the implant is an important factor in the degree of primary stability. Based on this, large threads are desirable in cases of poor bone quality. The insertion torque values are very important for the clinical determination of the levels of primary stability and the absence of micro movements whenever an immediate load is applied. The implant, used as if it were the last cutter, when correctly inserted, penetrates with pressure in the bone store if its diameter is larger than that of the cutter perforation. The implant design plays an influential role in achieving its primary stability.

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