The effects of flute shape and thread profile on the insertion torque and primary stability of dental implants

2012 ◽  
Vol 34 (7) ◽  
pp. 797-805 ◽  
Author(s):  
Shu-Wei Wu ◽  
Chia-Ching Lee ◽  
Ping-Yuen Fu ◽  
Shang-Chih Lin
Keyword(s):  
Dental Implants ◽  
Primary Stability ◽  
Insertion Torque ◽  
Thread Profile

scholarly journals Influence of Insertion Torque on Clinical and Biological Outcomes before and after Loading of Mandibular Implant-Retained Overdentures in Atrophic Edentulous Mandibles

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Fernanda Faot ◽  
Amália Machado Bielemann ◽  
Alessandra Julie Schuster ◽  
Raissa Micaella Marcello-Machado ◽  
Altair Antoninha Del Bel Cury ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Dental Implants ◽  
Survival Rates ◽  
Rank Correlation ◽  
Primary Stability ◽  
Insertion Torque ◽  
Success Rates ◽  
Implant Stability ◽  
Before And After ◽  
Edentulous Patients

Aim. To evaluate the influence of primary insertion torque (IT) values of narrow dental implants on the peri-implant health, implant stability, immunoinflammatory responses, bone loss, and success and survival rates. Methods. Thirty-one edentulous patients received two narrow implants (2.9x10mm, Facility NeoPoros) to retain mandibular overdentures. The implants were categorized in four groups according to their IT: (G1) IT > 10 Ncm; (G2) IT ≥ 10Ncm and ≤ 30 Ncm; (G3) IT >30Ncm and < 45Ncm; (G4) IT ≥ 45Ncm, and all implants were loaded after 3 months of healing. The following clinical outcomes were evaluated 1, 3, 6, and 12 months after implant insertion: (i) peri-implant tissue health (PH), gingival index (GI), plaque index (PI), calculus presence (CP), probing depth (PD), and bleeding on probing (BOP); (ii) implant stability quotient (ISQ) by resonance frequency analysis; and (iii) IL-1β and TNF-α concentration in the peri-implant crevicular fluid. The marginal bone level (MBL) and changes (MBC) were evaluated. The Chi2 test, Kruskal-Wallis test, mixed-effects regression analysis, and the Kendall rank correlation coefficient were used for statistical analysis (α = 5%). Results. G1 presented the highest PD at all evaluated periods. G2 presented higher PI at month 6 and 12. G4 showed increased GI at month 3 and 12 and more CP at month 1 (p=.003). G2 and G4 had higher ISQ values over the study period, while those from G1 and G3 presented lower ISQ values. The IL-1β concentration increased until month 12 and was independent of IT and bone type; G4 had a higher IL-1β concentration in month 3 than the other groups (p=.015). The TNF-α release was negatively correlated with IT, and TNF-α release was highest in G1 at month 12. The MBL immediately after surgery and the MBC at month 12 were similar between the groups, and G4 presented a positive MBC at month 12. The survival and success rates were 75% for G1, 81.3% for G2, 64.3% for G3, and 95% for G4. Conclusion. The IT did not influence the clinical outcomes and the peri-implant immunoinflammatory responses and was weakly correlated with the narrow dental implants primary stability. The observed success rates suggest that the ideal IT for atrophic fully edentulous patients may deviate from the standardized IT of 32 Ncm.

scholarly journals Evaluation of the correlation between insertion torque and primary stability of dental implants using a block bone test

2013 ◽  
Vol 43 (1) ◽  
pp. 30 ◽  
Author(s):  
Dorjpalam Bayarchimeg ◽  
Hee Namgoong ◽  
Byung Kook Kim ◽  
Myung Duk Kim ◽  
Sungtae Kim ◽  
...  
Keyword(s):  
Dental Implants ◽  
Primary Stability ◽  
Insertion Torque

scholarly journals Does the systemic administration of l-arginine affect dental implant stability in nicotine consumer dogs?

2021 ◽  
Vol 43 (1) ◽  
Author(s):  
Bijan Movahedian ◽  
Mansour Rismanchian ◽  
Hooman Navaei ◽  
Saeid Tavanafar ◽  
Soheil Koushaei
Keyword(s):  
Dental Implants ◽  
Dental Implant ◽  
Primary Stability ◽  
Insertion Torque ◽  
Implant Stability ◽  
Consumer Group ◽  
Value Analysis ◽  
Significant Difference ◽  
Group 2 ◽  
Arginine Supplementation

Abstract Background Nicotine can have detrimental effects on dental implant osseointegration. This study aimed to evaluate the influence of systemic l-arginine supplement on the osseointegration of dental implants in nicotine consumer dogs. Methods Twelve 1-year Labrador Retriever dogs had their right and left third and fourth mandibular premolars removed, and the sockets were left to heal for 6 months. Dogs were randomly divided into three groups (n = 16): group 1—0.2 mg/kg nicotine was injected twice daily; group 2—0.2 mg/kg nicotine was injected twice daily in addition to 200 mg/kg l-arginine capsules taken orally; and group 3—placebo. Forty-eight dental implants were inserted into the healed sockets of the dog’s mandible and were assessed by implant stability quotient (ISQ) using resonance frequency analysis (RFA) during 4 weeks and insertion and removal torque value analysis. Results No implant failure occurred during the study period. The change in torque value between insertion and removal was similar in the placebo and nicotine+arginine consumer dogs (p = 0.276), which shows a positive effect of arginine supplementation in nicotine consumers. There was a significant difference in torque value change between nicotine+arginine vs. nicotine consumers (p = 0.049) and placebo vs. nicotine (p = 0.003). After 4 weeks, the placebo had the most significant improvement in torque value (47.0 ± 16.9), followed by nicotine+arginine (25.1 ± 37.8), and the worst torque value was for the nicotine group (− 5.7 ± 24.0) pound per inch. The results show that except in the first week, there are significant differences in ISQ between the groups in different periods. ISQ in all of the groups has reduced at first but then increased over time. At the time of implant placement, insertion torque was significantly higher in the nicotine consumer group than the nicotine+arginine consumer group and placebo group (p = 0.020). Conclusion Arginine supplementation promotes bone healing and implant primary stability by improving dental implant osseointegration biomechanical characteristics.

scholarly journals An In Vitro Analysis on Polyurethane Foam Blocks of the Insertion Torque (IT) Values, Removal Torque Values (RTVs), and Resonance Frequency Analysis (RFA) Values in Tapered and Cylindrical Implants

2021 ◽  
Vol 18 (17) ◽  
pp. 9238
Author(s):  
Luca Comuzzi ◽  
Margherita Tumedei ◽  
Camillo D’Arcangelo ◽  
Adriano Piattelli ◽  
Giovanna Iezzi
Keyword(s):  
Dental Implants ◽  
Frequency Analysis ◽  
Primary Stability ◽  
Cortical Layer ◽  
Insertion Torque ◽  
Low Density ◽  
Resonance Frequency Analysis ◽  
Removal Torque ◽  
Torque Values

Background: Several different dental implant microgeometries have been investigated in the literature for use in low-density bone sites. The polyurethane solid rigid blocks represent an optimal in vitro study model for dental implants, because their composition is characterized by symmetrical linear chains of monomers of hexa-methylene sequences producing a self-polymerization process. The aim of the present investigation was to evaluate the primary stability of cylindrical and tapered implants positioned into low-density polyurethane solid rigid blocks. Materials and Methods: Two different macrogeometries, cylindrical (4 mm diameter and 10 mm length) and tapered dental implants (4.20 mm diameter and 10 mm length), were investigated in the present study. The implants were inserted into 10 PCF and 20 PCF polyurethane blocks, with and without an additional cortical layer. The insertion torque (IT) values, the removal torque values (RTVs), and the resonance frequency analysis (RFA) values were measured and recorded. Results: A total of 80 sites were tested, and a significant increased primary stability (PS) was detected in favour of tapered dental implants when compared to cylindrical implants in all experimental conditions (p < 0.05). Higher IT, RT, and RFA values were measured in tapered implants in 10 and 20 PCF polyurethane blocks, both with and without the additional cortical layer. Conclusions: Both implants showed sufficient primary stability in poor density substrates, while, on the other hand, the tapered microgeometry showed characteristics that could also lead to clinical application in low-density posterior maxillary sites, even with a drastically decreased bone cortical component.

scholarly journals Zirconia vs. Titanium Dental Implants: Primary Stability In-Vitro Analysis

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7886
Author(s):  
Nerea Arlucea ◽  
Aritza Brizuela-Velasco ◽  
Markel Dieguez-Pereira ◽  
Miquel Punset ◽  
Meritxell Molmeneu ◽  
...  
Keyword(s):  
Dental Implants ◽  
Primary Stability ◽  
Titanium Implants ◽  
Insertion Torque ◽  
Static Compression ◽  
Compression Load ◽  
Vitro Analysis ◽  
Titanium Dental Implants ◽  
Zirconia Implants

The present experimental trial uses two types of dental implants, one made of titanium (Ti6Al4V) and the other one of zirconia (ZrO2), but both of identical design, to compare their stability and micro-movements values under load. One of each type of implant (n = 42) was placed into 21 cow ribs, recording the insertion torque and the resonance frequency using a specific transducer. Subsequently, a prosthetic crown made of PMMA was screwed onto each of the implants in the sample. They were then subjected to a static compression load on the vestibular cusp of the crown. The resulting micromovements were measured. The zirconia implants obtained a higher mean of both IT and RFA when compared with those of titanium, with statistically significant differences in both cases (p = 0.0483 and p = 0.0296). However, the micromovement values when load was applied were very similar for both types, with the differences between them (p = 0.3867) not found to be statistically significant. The results show that zirconia implants have higher implant stability values than titanium implants. However, the fact that there are no differences in micromobility values implies that caution should be exercised when applying clinical protocols for zirconia based on RFA, which only has evidence for titanium.

Primary Stability of Cylindrical and Conical Dental Implants in Relation to Insertion Torque—A Comparative Ex Vivo Evaluation

2017 ◽  
Vol 26 (2) ◽  
pp. 250-255 ◽  
Author(s):  
Henning Staedt ◽  
Victor Palarie ◽  
Arne Staedt ◽  
Jens M. Wolf ◽  
Karl Martin Lehmann ◽  
...  
Keyword(s):  
Dental Implants ◽  
Ex Vivo ◽  
Primary Stability ◽  
Insertion Torque

scholarly journals Comparative Evaluation of Primary Stability between Different Diameters Multi-Scale Roughness Dental Implant by Solid Rigid Polyurethane Simulation

Osteology ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 62-72
Author(s):  
Margherita Tumedei ◽  
Morena Petrini ◽  
Alessandro Cipollina ◽  
Mariastella Di Carmine ◽  
Adriano Piattelli ◽  
...  
Keyword(s):  
Dental Implants ◽  
Primary Stability ◽  
Insertion Torque ◽  
Resonance Frequency Analysis ◽  
Removal Torque ◽  
Multi Scale ◽  
Significant Difference ◽  
Different Diameters ◽  
Implant Loading ◽  
Scale Roughness

Background: Implant primary stability is determined by screw characteristics and surgical procedure. The aim of the present study was to evaluate, on a polyurethane model, the insertion torque (IT), removal torque (RT), and resonance frequency analysis (RFA) of multi-scale roughness dental implants of different diameters. Methods: Two implant sizes were tested on two polyurethane blocks (20 pounds per cubic foot (PCF) and 30 PCF): 3.0 diameter and 13 mm length and 5.0 diameter and 13 mm length. The IT, RT, and RFA were assessed. Results: A significant difference of IT and RT was present in favor of wider implants at both polyurethane densities. No statistical difference was present between the 5.0 diameter and 3.0 diameter implants at both polyurethane densities. A statistically increased RFA was reported for 5.0 implant 30 PCF polyurethane blocks. Conclusions: Multi-scale roughness dental implants of both diameters showed high insertion torque and primary stability on polyurethane blocks, which is valuable for implant loading protocols.

scholarly journals The Effect of Threads Geometry on Insertion Torque (IT) and Periotest Implant Primary Stability: A High-Density Polyurethane Simulation for the Anterior Mandible

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 308
Author(s):  
Stefano Fanali ◽  
Margherita Tumedei ◽  
Pamela Pignatelli ◽  
Morena Petrini ◽  
Adriano Piattelli ◽  
...  
Keyword(s):  
Primary Stability ◽  
High Density ◽  
Insertion Torque ◽  
Mean Values ◽  
Implant Positioning ◽  
Thread Profile ◽  
Group A ◽  
Group B ◽  
Torque Values ◽  
Anterior Mandible

The implant geometry provides a key role in the osseointegration process and is able to improve the mechanical interaction and primary stability into the bone tissue. The aim of the present investigation was to compare different implant profiles to evaluate their influence on the primary stability on high-density polyurethane block. Methods: A total of 100 implants were used on 20 pcf polyurethane density in the present investigation, i.e., 20 implants for each of 5 groups (A, B, C, D, and E), characterized by different thread pitch and geometry. The insertion torque (IT), and Periotest mean values were recorded during the implant positioning. Results: Mean values for insertion torque values were higher for the group C and group E implant profiles when compared to all other groups (p < 0.01). No significant differences were detected between these two groups (p < 0.05). Lower IT (<20 Ncm2) were presented by groups A, B, and D (p < 0.05). All groups showed negative Periotest values. Group C implants showed the lowest level of Periotest values (p < 0.05). No significant Periotest differences were found between group B and group D and between group A and group E (p > 0.05). Conclusions: Implants with a wider and V-thread profile and a round apex showed a higher stability in a standardized polyurethane foam. Their use could be suggested in high-density bone in clinical practice.

scholarly journals Applicability of cone beam computed tomography gray values for estimation of primary stability of dental implants

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Mahnaz Sheikhi ◽  
Mehdi Karami ◽  
Somayeh Abbasi ◽  
Amirhossein Moaddabi ◽  
Parisa Soltani
Keyword(s):  
Computed Tomography ◽  
Bone Density ◽  
Dental Implants ◽  
Cone Beam Computed Tomography ◽  
Primary Stability ◽  
Cone Beam ◽  
Insertion Torque ◽  
Implant Stability ◽  
Preoperative Selection ◽  
Gray Values

Objective: To evaluate the relationship between bone density measured by computed tomography (CT) and cone beam computed tomography (CBCT) (Sirona’s Galileos scanner) with primary stability of dental implants. Material and methods: 20 fresh bovine femoral heads were prepared by removal of soft tissue, sectioning of the bone, and placement of markers for location and angulation of implants. Bone density of peri-implant areas was determined preoperatively by CT and CBCT scanning of the prepared bone samples represented by Hounsfield units (HUs) and gray values (GVs), respectively. Then, 60 implants in three sizes (diameter = 4 mm, length = 8, 10, and 12 mm) were inserted into the bones and maximum insertion torque (IT) was recorded. Osstell device was also used for determining the implant stability quotient (ISQ) for each implant. Statistical analysis was performed on the data (alpha = 0.05). Results: Mean ± SD values of GV, HU, and ISQ were 1592.75 ± 231.82, 675.26 ± 115.38 and 61.90 ± 10.14, respectively. Moreover, the most frequent IT limit was 30-35 Ncm (41.4%). Significant relationships were observed between HU and IT, GV and IT, HU and ISQ, GV and ISQ, and IT and ISQ in all implant sizes. Moreover, GV and HU also significantly correlated to each other. Conclusion: Bone density values in CBCT and CT scans are positively associated to primary stability of dental implants. Therefore, GVs obtained from Galileos CBCT scanner can be used for preoperative selection of edentulous sites which allow for better implant stability or locations which require further procedures for enhancing the success rate of dental implants.  KEYWORDSComputed tomography; Cone beam computed tomography; Dental implant.

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