Biomechanical evaluation of dental implants with three different designs: Removal torque and resonance frequency analysis in rabbits

2015 ◽  
Vol 199 ◽  
pp. 30-35 ◽  
Author(s):  
Sergio Alexandre Gehrke ◽  
Giovanni Wiel Marin
Keyword(s):  
Resonance Frequency ◽  
Dental Implants ◽  
Frequency Analysis ◽  
Resonance Frequency Analysis ◽  
Removal Torque ◽  
Biomechanical Evaluation

Effects of a Low-Intensity Laser on Dental Implant Osseointegration: Removal Torque and Resonance Frequency Analysis in Rabbits

2016 ◽  
Vol 42 (4) ◽  
pp. 316-320 ◽  
Author(s):  
Alberto Blay ◽  
Claudia C Blay ◽  
Samy Tunchel ◽  
Sergio Alexandre Gehrke ◽  
Jamil Awad Shibli ◽  
...  
Keyword(s):  
Laser Beam ◽  
Resonance Frequency ◽  
Dental Implants ◽  
Frequency Analysis ◽  
Control Group ◽  
Resonance Frequency Analysis ◽  
Removal Torque ◽  
Low Intensity ◽  
Torque Values ◽  
Intensity Laser

The objective of this study was to investigate how a low-intensity laser affects the stability and reverse torque resistance of dental implants installed in the tibia of rabbits. Thirty rabbits received 60 dental implants with the same design and surface treatment, one in each proximal metaphysis of the tibia. Three groups were prepared (n = 10 animals each): conventional osseointegration without treatment (control group), surgical sites irradiated with a laser beam emitted in the visible range of 680 nm (Lg1 group), surgical sites irradiated with a laser beam with a wavelength in the infrared range of 830 nm (Lg2 group). Ten irradiation sessions were performed 48 hours apart; the first session was during the immediate postoperative period. Irradiation energy density was 4 J/cm2 per point in 2 points on each side of the tibias. The resonance frequency and removal torque values were measured at 2 time points after the implantations (3 and 6 weeks). Both laser groups (Lg1 and Lg2) presented a significant difference between resonance frequency analysis values at the baseline and the values obtained after 3 and 6 weeks (P > .05). Although the removal torque values of all groups increased after 6 weeks (P < .05), both laser groups presented greater mean values than those of the control group (P < .01). Photobiomodulation using laser irradiation with wavelengths of 680 and 830 nm had a better degree of bone integration than the control group after 6 weeks of observation time.

Assessment of the Correlation Between Insertion Torque and Resonance Frequency Analysis of Implants Placed in Bone Tissue of Different Densities

2014 ◽  
Vol 40 (3) ◽  
pp. 259-262 ◽  
Author(s):  
Luiz Carlos Magno Filho ◽  
Fabiano Ribeiro Cirano ◽  
Fernando Hayashi ◽  
Hsu Shao Feng ◽  
Alexandre Conte ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Dental Implants ◽  
Frequency Analysis ◽  
Pearson Correlation ◽  
T Test ◽  
Insertion Torque ◽  
Type I ◽  
Resonance Frequency Analysis ◽  
Group A ◽  
Group B

The primary stability of dental implants is fundamental for osseointegration. Therefore, this study aimed to assess the correlation between insertion torque (IT) and resonance frequency analysis (RFA) of implants placed in mandibles and maxillas of different bone densities. Eighty dental implants were placed in maxillas and mandibles, and IT and the implant stability quotient (ISQ) were measured at the time of implant insertion. Bone density was assessed subjectively by the Lekholm and Zarb index. The type I and II densities were grouped together (group A)as were the type III and IV densities (group B). The IT in group A was higher (Student t test, P = .0013) than in group B (46.27 ± 18.51 Ncm, 33.62 ± 14.74 Ncm, respectively). The implants placed in group A showed higher ISQ (Student t test, P = .0004) than those placed in group B (70.09 ± 7.50, 63.66 ± 8.00, respectively). A significant correlation between IT and the ISQ value was observed for group A (Pearson correlation test; r = 0.35; P = .0213) and for group B (r = 0.37; P = .0224). Within the limitations of this study, it was possible to conclude that there is a correlation between IT and RFA of implants placed in mandibles and maxillas of different bone densities.

An in vitro evaluation on polyurethane foam sheets of the insertion torque, removal torque values, and resonance frequency analysis (RFA) of a self-tapping threads and round apex implant

2020 ◽  
pp. 026248932097179
Author(s):  
Margherita Tumedei ◽  
Adriano Piattelli ◽  
Antonello Falco ◽  
Francesco De Angelis ◽  
Felice Lorusso ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Dental Implant ◽  
Frequency Analysis ◽  
Insertion Torque ◽  
Resonance Frequency Analysis ◽  
Removal Torque ◽  
In Vitro Investigation ◽  
Posterior Maxilla ◽  
Torque Values

The dental implant primary stability and micromovement absence represent critical factor for dental implant osseointegration. The aim of the present in vitro investigation was to simulate the bone response on different polyurethane densities the effect of self-tapping threads and round apex implant geometry. A total of 40 implants were positioned in D1, D2, D3 and D4 polyurethane block densities following a calibrated drilling protocol. The Insertion, removal Torque and resonance frequency analysis (RFA) means were calculated. All experimental conditions showed insertion torque values >30 Ncm. A significant higher insertion torque, removal and RFA was present in D1 polyurethane. Similar evidences were evidenced for D3 and D4. The effectiveness of the present study suggested a valuable clinical advantage for self-tapping threads and round apex implant using, such as in case of reduced bone density in the posterior maxilla

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