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.

scholarly journals Impact of Insertion Depth and Predrilling Diameter on Primary Stability of Orthodontic Mini-implants

2009 ◽  
Vol 79 (4) ◽  
pp. 609-614 ◽  
Author(s):  
Benedict Wilmes ◽  
Dieter Drescher
Keyword(s):  
Bone Quality ◽  
Primary Stability ◽  
Site Preparation ◽  
Insertion Torque ◽  
Insertion Depth ◽  
Mini Implants ◽  
Local Bone ◽  
The Mean ◽  
Implant Site Preparation ◽  
The Impact

Abstract Objective: To test the hypothesis that the impact of the insertion depth and predrilling diameter have no effect on the primary stability of mini-implants. Materials and Methods: Twelve ilium bone segments of pigs were embedded in resin. After implant site preparation with different predrilling diameters (1.0, 1.1, 1.2, and 1.3 mm), Dual Top Screws 1.6 × 10 mm (Jeil, Korea) were inserted with three different insertion depths (7.5, 8.5, and 9.5 mm). The insertion torque was recorded to assess primary stability. In each bone, five Dual Top Screws were used as a reference to compensate for the differences of local bone quality. Results: Both insertion depth and predrilling diameter influenced the measured insertion torques distinctively: the mean insertion torque for the insertion depth of 7.5 mm was 51.62 Nmm (±25.22); for insertion depth of 8.5 mm, 65.53 Nmm (±29.99); and for the insertion depth of 9.5 mm, 94.38 Nmm (±27.61). The mean insertion torque employing the predrill 1.0 mm was 83.50 Nmm (±33.56); for predrill 1.1 mm, 77.50 Nmm (±27.54); for the predrill 1.2 mm, 61.70 Nmm (±28.46); and for the predrill 1.3 mm, 53.10 (±32.18). All differences were highly statistically significant (P < .001). Conclusions: The hypothesis is rejected. Higher insertion depths result in higher insertion torques and thus primary stability. Larger predrilling diameters result in lower insertion torques.

Influence of Bone Quality, Drilling Protocol, Implant Diameter/Length on Primary Stability: An In Vitro Comparative Study on Insertion Torque and Resonance Frequency Analysis

2020 ◽  
Vol 46 (3) ◽  
pp. 182-189 ◽  
Author(s):  
Davide Farronato ◽  
Mattia Manfredini ◽  
Michele Stocchero ◽  
Mattia Caccia ◽  
Lorenzo Azzi ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Bone Quality ◽  
Frequency Analysis ◽  
Primary Stability ◽  
Mean Difference ◽  
Insertion Torque ◽  
Resonance Frequency Analysis ◽  
Bone Response ◽  
Implant Length

The aim of this study was to evaluate the influence of bone quality, drilling technique, implant diameter, and implant length on insertion torque (IT) and resonance frequency analysis (RFA) of a prototype-tapered implant with knife-edge threads. The investigators hypothesized that IT would be affected by variations in bone quality and drilling protocol, whereas RFA would be less influenced by such variables. The investigators implemented an in vitro experiment in which a prototype implant was inserted with different testing conditions into rigid polyurethane foam blocks. The independent variables were: bone quality, drilling protocol, implant diameter, and implant length. Group A implants were inserted with a conventional drilling protocol, whereas Group B implants were inserted with an undersized drilling protocol. Values of IT and RFA were measured at implant installation. IT and RFA values were significantly correlated (Pearson correlation coefficient: 0.54). A multivariable analysis showed a strong model. Higher IT values were associated with drilling protocol B vs A (mean difference: 71.7 Ncm), implant length (3.6 Ncm increase per mm in length), and substrate density (0.199 Ncm increase per mg/cm3 in density). Higher RFA values were associated with drilling protocol B vs A (mean difference: 3.9), implant length (1.0 increase per mm in length), and substrate density (0.032 increase per mg/cm3 in density). Implant diameter was not associated with RFA or IT. Within the limitations of an in vitro study, the results of this study suggest that the studied implant can achieve good level of primary stability in terms of IT and RFA. A strong correlation was found between values of IT and RFA. Both parameters are influenced by the drilling protocol, implant length, and substrate density. Further studies are required to investigate the clinical response in primary stability and marginal bone response.

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.

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 An in vitro investigation of peak insertion torque values of six commercially available mini-implants

2010 ◽  
Vol 33 (6) ◽  
pp. 660-666 ◽  
Author(s):  
C. Z. Y. Whang ◽  
D. Bister ◽  
M. Sherriff
Keyword(s):  
Insertion Torque ◽  
Mini Implants ◽  
In Vitro Investigation ◽  
Torque Values

Predicting primary stability of orthodontic mini‐implants, according to position, screw‐size, and bone quality, in the maxilla of aged patients: a cadaveric study

2019 ◽  
Vol 127 (5) ◽  
pp. 462-471 ◽  
Author(s):  
Stephan C. Möhlhenrich ◽  
Nicole Heussen ◽  
Philipp Winterhalder ◽  
Andreas Prescher ◽  
Frank Hölzle ◽  
...  
Keyword(s):  
Bone Quality ◽  
Primary Stability ◽  
Cadaveric Study ◽  
Aged Patients ◽  
Mini Implants

scholarly journals Influence of Implant Thread Morphology on Primary Stability: A Prospective Clinical Study

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Maria Menini ◽  
Francesco Bagnasco ◽  
Ivan Calimodio ◽  
Nicolò Di Tullio ◽  
Francesca Delucchi ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Outcome Measures ◽  
Primary Stability ◽  
Secondary Outcome ◽  
Prospective Clinical Study ◽  
Insertion Torque ◽  
Significant Difference ◽  
Group 5 ◽  
One Year ◽  
Torque Values

Objectives. The purpose of this study was to evaluate the primary stability of two implants with the same macro- and micromorphology but different thread design and analyze their clinical outcomes over a one-year period. Materials and Methods. 14 patients needing a partial rehabilitation with a delayed loading approach (DEL group: 9 patients) or a full-arch rehabilitation treated with immediately loaded fixed prostheses supported by 4 implants following the Columbus Bridge Protocol (CBP) (IL group: 5 patients) were included. In each patient, at least one SY (implant with standard threads) and one SL implant (implant with an augmented depth of the threads) were randomly inserted. Primary outcome measures were the number of threads exposed at a torque of 30 Ncm and 50 Ncm and final insertion torque. Secondary outcome measures were implant and prosthetic failure, peri-implant bone resorption, and periodontal parameters: bleeding on probing (BoP), plaque index (PI), and probing depth (PD) evaluated at 3, 6, and 12 months of healing. Results. Nineteen SY and 19 SL implants were inserted in 14 patients. Twenty implants (10 SL and 10 SY) were inserted in the IL group, while 18 (9 SL and 9 SY) were inserted in the DEL group and followed-up for 12 months. No patients dropped out. No implants and prostheses failed. No biological complications were identified. No significant differences were found between SY and SL implants comparing the number of exposed threads when inserting the implant with a torque insertion of 30 N (T student test p=.142 and U test p=.164). At 50 N, no threads were visible in either groups. Final torque insertion values were higher for SL (mean: 48.42 Ncm) compared to SY implants (mean: 43.42 Ncm) without a statistically significant difference. All the implants showed good clinical outcomes at the 1-year-in-function visit. Conclusions. After 12 months of function, both implant types provided good clinical outcomes without statistically significant differences between the two groups. A difference in insertion torque (even if not statistically significant) was found with higher insertion torque values for SL implants with a larger thread depth.

scholarly journals Effects of repeated sterilization cycles on primary stability of orthodontic mini-screws

2012 ◽  
Vol 83 (4) ◽  
pp. 674-679 ◽  
Author(s):  
Sercan Akyalcin ◽  
Holly P. McIver ◽  
Jeryl D. English ◽  
Joe C. Ontiveros ◽  
Ron L. Gallerano
Keyword(s):  
Lateral Displacement ◽  
Primary Stability ◽  
Statistical Testing ◽  
Insertion Torque ◽  
Main Effect ◽  
Displacement Force ◽  
Level Of Significance ◽  
Torque Values ◽  
Force Data ◽  
Clinical Stability

ABSTRACT Objective: To determine if repeated sterilization has deleterious effects on the clinical stability of mini-screws. Materials and Methods: Thirty each of the following mini-screws were tested: Aarhus (American Orthodontics, Sheboygan, Wisc), VectorTAS (Ormco Corporation, Orange, Calif), Dual-Top (RMO, Denver, Colo), and Ortho Anchor (KLS Martin, Jacksonville, Fla). Controls were sterilized once using a steam autoclave (Statim 5000, SciCan USA, Canonsburg, Pa). Each group of mini-screws was divided into three groups: the control (n  =  10) and two test groups (n  =  10, each). Test groups were cycled five and 10 times respectively. All screws were inserted into custom-designed synthetic blocks that simulated mandibular bone. Maximum insertion torque and lateral displacement force data were recorded and subjected to statistical testing. Two-way analysis of variance (ANOVA) and three-way mixed ANOVA were used for statistical analyses for maximum insertion torque data and lateral displacement force data, respectively. Level of significance was established at P < .05. Results: Insertion torque values displayed significant differences between both of the groups and sterilization cycles (P < .05). Significant differences were observed between American Aarhus mini-screws and both RMO and KLS Martin mini-screws. Ormco Vector mini-screws also differed significantly from the KLS Martin mini-screws in this comparison (P < .05). For lateral displacement, there was a significant main effect of groups, F(1,36)  =  14.5 (P < .05). Significant differences were observed between American Aarhus mini-screws and all three of the other groups (P < .05). Conclusions: The examined groups displayed statistical differences of variable quality that may not affect their clinical stability.

scholarly journals Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

2016 ◽  
Vol 21 (5) ◽  
pp. 47-52 ◽  
Author(s):  
Rafael Ribeiro Maya ◽  
◽  
Célia Regina Maio Pinzan-Vercelino ◽  
Julio de Araujo Gurgel ◽  
Keyword(s):  
Alveolar Bone ◽  
Ex Vivo ◽  
Primary Stability ◽  
Insertion Torque ◽  
Significance Level ◽  
Mini Implants ◽  
Implant Placement ◽  
Human Cadavers ◽  
Ex Vivo Study ◽  
Posterior Area

ABSTRACT Objective: The aim of the present ex-vivo study was to evaluate the effect of the vertical placement angle of mini-implants on primary stability by analyzing maximum insertion torque (MIT). Methods: Mini-implants were placed in 30 human cadavers, inserted at either a 90° or 60° angle to the buccal surface of the maxillary first molar. Out of 60 self-drilling mini-implants used, half were of the cylindrical type and half were of the conical type. Primary stability was assessed by means of measuring the MIT. Data were subjected to analysis of variance (ANOVA) and Newman-Keuls tests. A significance level of 5% was adopted. Results: The MIT was higher for both mini-implant types when they were placed at a 90° angle (17.27 and 14.40 Ncm) compared with those placed at a 60° angle (14.13 and 11.40 Ncm). Conclusions: MIT values were differed according to the vertical mini-implant placement angle in the maxillary posterior area. Regardless of the type of mini-implant used, placement at a 90° angle resulted in a higher MIT.

A Four-Year Survival Rate Multicenter Prospective Clinical Study on 377 Implants: Correlations Between Implant Insertion Torque, Diameter, and Bone Quality

2015 ◽  
Vol 41 (3) ◽  
pp. e60-e65 ◽  
Author(s):  
Carlo Maiorana ◽  
Davide Farronato ◽  
Stefano Pieroni ◽  
Marco Cicciu ◽  
Dario Andreoni ◽  
...  
Keyword(s):  
Clinical Study ◽  
Survival Rate ◽  
Bone Quality ◽  
Primary Stability ◽  
Prospective Clinical Study ◽  
Insertion Torque ◽  
Connection System ◽  
Prosthetic Component ◽  
Prosthetic Complications

The purpose of this study was to evaluate the survival rate and incidence of prosthetic complications in 377 implants with a double octagon connection. Furthermore, the correlations among implant dimensions (diameter and length), bone quality, and insertion torque were investigated. A 4-year multicenter prospective clinical study was designed to evaluate the survival rate of 377 dental implants inserted in 189 patients between January 2004 and April 2010. After an average follow-up of 46 months, the implant survival rate was 99.7%, and the incidence of complication was 0.53%. Moreover, insertion torque was statistically related in a significant way to implant diameter. The connection system seemed to reduce the risk that the prosthetic component screw would loosen. Within the limits of this study, it was observed that a wider diameter corresponded to a higher implant primary stability. Implant length did not seem to be critical in obtaining higher primary stability.

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