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.

scholarly journals New Implant Design with Midcrestal and Apical Wing Thread for Increased Implant Stability in Single Postextraction Maxillary Implant

2019 ◽  
Vol 2019 ◽  
pp. 1-4 ◽  
Author(s):  
Antonio Scarano ◽  
Bartolomeo Assenza ◽  
Francesco Inchingolo ◽  
Filiberto Mastrangelo ◽  
Felice Lorusso
Keyword(s):  
Cortical Bone ◽  
Dental Implant ◽  
Alveolar Bone ◽  
Primary Stability ◽  
Implant Design ◽  
Insertion Torque ◽  
Fixture Design ◽  
Implant Stability ◽  
Implant Placement ◽  
Immediate Placement

Background. The immediate placement of a dental implant could represent an option treatment for the rehabilitation of a postextractive missing tooth socket to replace compromised or untreatable teeth, with the advantage of single-session surgery. In this way, the anatomy of the alveolar bone defect, the preservation of the buccal cortical bone, and the primary stability of the fixture represent the critical factors that consent a precise implant placement. Objective. This case report describes a novel fixture design for postextractive alveolar socket immediate implant. Methods. Two patients (25 and 31 years old) were treated for postextractive dental implant placement to replace both central upper incisor teeth with four implants. The residual bone implant gap was not filled with graft or bone substitute. The restoration was provided following a standard loading protocol by a cement-sealed prosthetic abutment. Results. Clinically, all implants positioned showed an excellent insertion torque. No postoperative complications were reported. At 6 months of healing, the buccal cortical bone and the implant stability were present and well maintained. Conclusion. The evidence of this study allows us to underline the possible advantages of this new fixture design for postextractive implant technique.

scholarly journals Does the Modification of the Apical Geometry of a Dental Implant Affect Its Primary Stability? A Comparative Ex Vivo Study

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1728
Author(s):  
Henning Staedt ◽  
Diana Heimes ◽  
Karl M. Lehmann ◽  
Peter Ottl ◽  
Monika Bjelopavlovic ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Primary Stability ◽  
Insertion Torque ◽  
Modifying Factors ◽  
Implant System ◽  
Screw Threads ◽  
Implant Bed ◽  
Line P ◽  
Ex Vivo Study ◽  
Push Out

(1) Background: Primary stability—one fundamental criterion for the success of dental implants—is influenced by implant geometry even if the effect of apical shape modifications on implant primary stability has not yet been examined. Therefore, the aim of the ex vivo study was to compare primary stability of implants differing in apically located screw threads (J-line) or a flat tip (K-line) only. (2) Methods: 28 implants of each group of the same diameter (4.3 mm) were randomly inserted into porcine bone blocks. The first group (9, 11 and 13 mm) was inserted into “hard”, the second (11 mm) into “soft” bone, here using a normal and an undersized drilling protocol. Insertion torque (Ncm), Periotest® value, resonance frequency (implant stability coefficient, ISQ) and push-out force (N) were measured. (3) Results: In “hard” bone, primary stability increased with increasing length in both groups but it was significantly higher in J-line (p < 0.03). An undersized preparation of the implant bed in “soft” bone resulted in a significant increase in primary stability in both groups. Here, J-line also showed a significantly increased primary stability when compared to equally prepared K-line (insertion torque: 37 Ncm vs. 26 Ncm; Periotest®: −6.5 vs. −4.3; push-out force: 365 N vs. 329 N; p < 0.05 each). (4) Conclusions: Primary stability is significantly higher with increasing implant length and apically located screw threads as well as with undersized drilling protocols. When preparing the implant site and subsequently selecting the implant system, modifying factors such as implant geometry (also at the tip) should be taken into account.

scholarly journals Relation Between Insertion Torque and Implant Stability Quotient: A Clinical Study

2021 ◽  
Author(s):  
João Paulo do Vale Souza ◽  
Clóvis Lamartine de Moraes Melo Neto ◽  
Lucas Tavares Piacenza ◽  
Emily Vivianne Freitas da Silva ◽  
André Luiz de Melo Moreno ◽  
...  
Keyword(s):  
Tooth Extraction ◽  
Primary Stability ◽  
Insertion Torque ◽  
Resonance Frequency Analysis ◽  
Implant Stability ◽  
Significance Level ◽  
Positive Correlation ◽  
Implant Stability Quotient ◽  
Implant Placement ◽  
Secondary Stability

Abstract Objectives This study aimed to assess the relation between the insertion torque and implant stability quotient (ISQ recorded immediately and 6 months after implant placement). Materials and Methods Twenty-five patients over the age of 18 years were selected for this study. One implant was placed per patient after tooth extraction. The implant site needed 15 mm in height and 8 mm in width. All implants had the same size (11.5 × 3.75 mm) and brand (Hexagonal Morse cone, DSP Biomedical). The insertion torque (Ncm) and resonance frequency analysis (ISQ value) (Osstell Mentor) were used to assess the primary stability (on the day of surgery). After 6 months, ISQ value was used to assess the secondary stability of each implant. Statistical Analysis The insertion torque data were correlated with ISQ measurements by using Pearson’s correlation. The significance level was 5%. Results There was a positive correlation between insertion torque and initial ISQ (correlation: 0.457; p = 0.022); however, no correlation was found between insertion torque and final ISQ (p = 0.308). Conclusion The present study demonstrated that there is a positive correlation between the insertion torque and the initial ISQ. Therefore, the higher the insertion torque, the higher the initial ISQ (or vice versa).

Socket preservation using xenograft does not impair implant primary stability in sheep: clinical, histological and histomorphometric study

2020 ◽  
Author(s):  
Yaniv Mayer ◽  
Ofir Ginesin ◽  
Hadar Zigdon-Giladi
Keyword(s):  
Bone Biopsy ◽  
Primary Stability ◽  
Insertion Torque ◽  
Socket Preservation ◽  
Histomorphometric Study ◽  
Implant Placement ◽  
High Bone ◽  
Delayed Implant Placement ◽  
Natural Healing

Implant primary stability, which depends mainly on the amount and quality of bone, is important for implant survival. Socket preservation aims to reduce bone volumetric changes following tooth extraction. This animal study aims to examine whether preserving a ridge by using xenograft impairs the primary stability of the implant. Eighteen artificial bone defects were prepared in four sheep (5mmØ and 8mm length).  Defects were randomly grafted with xenografts: Bio-Oss (BO), Bioactive Bone (BB), or left for natural healing (control). After 8 weeks, bone biopsy was harvested and dental implants installed. During installation, peak insertion torque (IT) was measured by hand ratchet, and primary stability by the Osstell method. Histomorphometric analysis showed a higher percentage of new bone formation in the naturally healed defects compared to sites with xenograft (control 68.66 ± 4.5%, BB 48.75 ± 4.34%, BO 50.33 ± 4.0%). Connective tissue portion was higher in the BO and BB groups compared to control (44.25 ± 2.98%, 41 ± 6%, and 31.33 ± 4.5, p&lt;0.05, respectively). Residual grafting material was similar in BO and BB (7 ± 2.44%, 8.66 ± 2.1 %, respectively). Mean IT and ISQ values were not statistically different among the groups. A positive correlation was found between IT and ISQ (r=0.65, p=0.00). In conclusion, previously grafted defects with xenograft did not influence primary stability and implant insertion torque in delayed implant placement. These results may be attributed to a relatively high bone fill of the defect (~50%) two months after grafting.

scholarly journals Why are mini-implants lost: The value of the implantation technique!

2015 ◽  
Vol 20 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Fabio Lourenço Romano ◽  
Alberto Consolaro
Keyword(s):  
Orthodontic Treatment ◽  
Alveolar Bone ◽  
Implantation Technique ◽  
Success Rates ◽  
Mini Implants ◽  
Scientific Curiosity ◽  
Implant Placement ◽  
Treatment Demand ◽  
Implant Size ◽  
Placement Technique

The use of mini-implants have made a major contribution to orthodontic treatment. Demand has aroused scientific curiosity about implant placement procedures and techniques. However, the reasons for instability have not yet been made totally clear. The aim of this article is to establish a relationship between implant placement technique and mini-implant success rates by means of examining the following hypotheses: 1) Sites of poor alveolar bone and little space between roots lead to inadequate implant placement; 2) Different sites require mini-implants of different sizes! Implant size should respect alveolar bone diameter; 3) Properly determining mini-implant placement site provides ease for implant placement and contributes to stability; 4) The more precise the lancing procedures, the better the implant placement technique; 5) Self-drilling does not mean higher pressures; 6) Knowing where implant placement should end decreases the risk of complications and mini-implant loss.

scholarly journals Influence of high insertion torque on implant placement: an anisotropic bone stress analysis

2010 ◽  
Vol 21 (6) ◽  
pp. 508-514 ◽  
Author(s):  
Bruno Salles Sotto-Maior ◽  
Eduardo Passos Rocha ◽  
Erika Oliveira de Almeida ◽  
Amilcar Chagas Freitas-Júnior ◽  
Rodolfo Bruniera Anchieta ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Cancellous Bone ◽  
Maximum Principal Stress ◽  
Insertion Torque ◽  
Stress Concentrations ◽  
Bone Implant ◽  
Significance Level ◽  
Bone Stress ◽  
Implant Placement ◽  
Solid Works

The aim of this study was to evaluate the influence of the high values of insertion torques on the stress and strain distribution in cortical and cancellous bones. Based on tomography imaging, a representative mathematical model of a partial maxilla was built using Mimics 11.11 and Solid Works 2010 softwares. Six models were built and each of them received an implant with one of the following insertion torques: 30, 40, 50, 60, 70 or 80 Ncm on the external hexagon. The cortical and cancellous bones were considered anisotropic. The bone/implant interface was considered perfectly bonded. The numerical analysis was carried out using Ansys Workbench 10.0. The convergence of analysis (6%) drove the mesh refinement. Maximum principal stress (σmax) and maximum principal strain (εmax) were obtained for cortical and cancellous bones around to implant. Pearson's correlation test was used to determine the correlation between insertion torque and stress concentration in the periimplant bone tissue, considering the significance level at 5%. The increase in the insertion torque generated an increase in the σmax and εmax values for cortical and cancellous bone. The σmax was smaller for the cancellous bone, with greater stress variation among the insertion torques. The εmax was higher in the cancellous bone in comparison to the cortical bone. According to the methodology used and the limits of this study, it can be concluded that higher insertion torques increased tensile and compressive stress concentrations in the periimplant bone tissue.

scholarly journals Tooth Discoloration after Regenerative Endodontic Procedures with Calcium Silicate-Based Cements—An Ex Vivo Study

2020 ◽  
Vol 10 (17) ◽  
pp. 5793
Author(s):  
Paulo J. Palma ◽  
Joana A. Marques ◽  
Joana Santos ◽  
Rui I. Falacho ◽  
Diana Sequeira ◽  
...  
Keyword(s):  
Calcium Silicate ◽  
Color Change ◽  
Ex Vivo ◽  
Mineral Trioxide Aggregate ◽  
Critical Factor ◽  
Color Variation ◽  
Significance Level ◽  
Tooth Discoloration ◽  
Biomaterial Application ◽  
Ex Vivo Study

The aim of the present ex vivo study was to assess and compare coronal discoloration induced by four endodontic biomaterials used in regenerative endodontic procedures (REPs). Root resection was executed horizontally, 2 mm apical to the cementoenamel junction, in all fifty-four teeth. After accessing the pulp chamber, specimens were randomly divided in groups and filled with either saline solution or blood, followed by calcium silicate-based cements (CSCs) placement: ProRoot mineral trioxide aggregate (MTA) (Dentsply Sirona), Biodentine (Septodont), TotalFill BC (FKG), or pulp capping material (PCM) (Coltène). Color change (ΔE) was assessed using the L* a* b* system at five different timepoints (before and immediately after biomaterial application, 72 h, 7 days, and 6 months). The significance level for statistical analysis was set at p < 0.05. There are statistically significant differences regarding ΔE over time (p < 0.001). Statistical differences are found considering material (p < 0.001), treatment (p = 0.007), or both (p = 0.002). If solely the material or treatment is considered, regardless of time, statistically significant differences are detected (p < 0.001). After a six-month period of evaluation, blood exposure might be a critical factor in biomaterials’ color variation. Biodentine presents the lowest discoloration potential, followed by TotalFill and PCM, albeit without statistically significant differences. MTA exhibited the greatest color variation. The selection of biomaterial should consider the material’s discoloration potential.

Implant Bone Rings. One-Stage Three-Dimensional Bone Transplant Technique: A Case Report

2010 ◽  
Vol 36 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Mark R. Stevens ◽  
Hany A. Emam ◽  
Mahmoud E. L. Alaily ◽  
Mohamed Sharawy
Keyword(s):  
Alveolar Bone ◽  
Three Dimensional ◽  
Primary Stability ◽  
Surgical Approaches ◽  
Socket Preservation ◽  
Implant Placement ◽  
Basal Bone ◽  
Augmentation Techniques ◽  
Immediate Implant ◽  
Teeth Extraction

Abstract A variety of techniques and materials has been used to provide the structural base of bone and soft tissue support for dental implants. Alveolar bone augmentation techniques include different surgical approaches such as guided bone regeneration, onlay grafting, interpositional grafting, distraction osteogenesis, ridge splitting, and socket preservation. In the case presented, a technique was used to augment the alveolar bone three-dimensionally with autologous “bone rings” and immediate implant placement in a 1-stage procedure following teeth extraction. Bone rings (circular osteotomies) were outlined at the symphysis area using trephine burs, and a central osteotomy for implant placement was done before its removal. The rings were then removed and sculptured to fit the extraction socket; this was followed by screwing the implant through the ring, gaining its primary stability from the prepared basal bone.

The Influence of Implant Shape on Primary Stability of Implants With a Thread Cutting and Forming Design: An Ex Vivo Study

2019 ◽  
Vol 45 (3) ◽  
pp. 181-185 ◽  
Author(s):  
Cagatay Dayan ◽  
Onur Geckili ◽  
Canan Bural
Keyword(s):  
Ex Vivo ◽  
Primary Stability ◽  
Type I ◽  
Resonance Frequency Analysis ◽  
Implant Stability ◽  
Thread Cutting ◽  
Type Iii ◽  
Experienced Clinician ◽  
Significant Difference ◽  
Ex Vivo Study

The design of an implant has a great effect on primary stability. The purpose of this study was to determine the differences in primary stability between straight and tapered Neoss ProActive implants in type I and type III bones using resonance frequency analysis (RFA) and electronic percussive testing (EPT) methods. Fresh cow vertebrae and pelvis were used as models of type III and type i bone, respectively. Implants of 2 different designs—straight and tapered Neoss ProActive implants with a thread cutting and forming (TCF) design, both 3.5-mm wide and 11-mm long—were placed in both types of bone (n = 60). The primary stability of all implants was measured by an experienced clinician blinded to the study protocol using the EPT and RFA devices. No statistically significant difference was found between the implant stability quotients and the percussive test values of straight and tapered implants in either bone type. Within the limitations of this ex vivo study, it may be concluded that the shape of an implant with a TCF design does not affect primary stability.

Sign in / Sign up

Export Citation Format

Share Document