Correlation between abutment angulation and off-axial stresses on biomechanical behavior of titanium and zirconium implants in the anterior maxilla: A three-dimensional finite element analysis study

Guguloth, Harilal; Duggineni, Chalapathi Rao; Chitturi, Ravi Kumar; Sujesh, M; Ravvali, T; Amiti, Roja Roshan

doi:10.4103/jips.jips_268_19

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…The accumulated stress at all angles was found to be very low in the non-screw connection type. Additionally, Guguloth et al [62] determined in their results that stress accumulation of restoration in angled abutments would be greater than the straight one, and this finding coincided with this study.…”

Section: Discussionsupporting

confidence: 90%

Stress Distributions Created by Short and Regular Implants Placed in the Anterior Maxilla at Different Angles: A Finite Element Analysis

Özmen¹,

Bayındır²

2023

OJST

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Although short implants are seen as alternative treatments that require additional surgical techniques in posterior region, they can be applied to anterior maxilla and various studies are required on this subject. The purpose of this study was to examine and compare the peak von Mises stress distributions in the crown, implant and abutment by using finite element analysis (FEA). Besides, a comparison of the implant-abutment connection types in the short implant with the FEA method was established. A short implant (4 × 5 mm) with a taper-lock connection and a regular implant (4 × 9 mm) with a screw connection were used in maxillary central incisor tooth area. Three different titanium abutments with 0˚, 15˚ and 25˚ angles were used for abutments. In addition, in order to determine whether the stress change in short implants is due to the length of the implant-abutment connection, a screw was designed for a short implant and it was also evaluated in the same three angles. A total of three groups and nine models were generated. 114.6N load was applied to the cingulum area of the crown at an angle of 135˚ to the long axis of the crowns. A torque load of 25 Ncm was applied to the regular and short implant screw. Von Mises stress distributions of implants, abutments and crowns were evaluated by using FEA. Increased angle in implants increased von Mises stress values of implant, abutment and crown. Screw connection was found higher at all angles in short implants. Close values were found at different angles in taper-lock short implant crowns. The length and the angle in the bone of implant with the type of implant-abutment connection results in the accumulated stress values. Clinical Implications Taper implant-abutment connection system was found to be more promising in terms of stress accumulation in crowns. Although the amount of stress on the abutment increased due to the length of the implant in short implants, taper How to cite this paper: Özmen, M.F. and Bayındır, F.

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Section: Discussionsupporting

confidence: 90%

Stress Distributions Created by Short and Regular Implants Placed in the Anterior Maxilla at Different Angles: A Finite Element Analysis

Özmen¹,

Bayındır²

2023

OJST

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“…Rehabilitation of edentulous resorbed maxillary alveolar ridge is also very challenging with dental implants because of its complex three-dimensional (3D) resorption process which involves vertical and horizontal resorption with sinus pneumatization. [ 4 ] Stretched nasal cavities,[ 5 ] resorption of posterior region,[ 6 ] and low bone quality (D3/D4) and quantity[ 7 8 ] are often seen in maxilla. Sinus lift surgeries that are indicated in these cases have their own limitations such as multiple surgical procedures, patient's morbidity, high risk of complications, longer treatment time, high cost, and low patient acceptability.…”

Section: Introductionmentioning

confidence: 99%

A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths

Kumari

Malhotra

Phogat

et al. 2020

J Indian Prosthodont Soc

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Aim: The aim of this work was to evaluate stress distribution on implants in All-on-Four situation with varying distal implant angulations (30°,40°,45°) and varying cantilever lengths (4 mm, 8 mm, 12 mm, 16 mm) in atrophic maxilla using finite element analysis. Setting and Design: A in vitro study, finite element analysis. Materials and Methodology: Three-dimensional finite element model of an edentulous maxilla restored with a prosthesis supported by four implants was reconstructed to carry out the analysis. Three different configurations, corresponding to 3 tilt degrees of the distal implants (30°, 40°, and 45°) were subjected to 4 loading simulations. Statistical Analysis Used: The results of the simulations obtained were evaluated in terms of Von Mises equivalent stress levels at the bone-implant interface. Result: From a stress-level viewpoint, the 45° model was revealed to be the most critical for peri-implant bone. In all the loading simulations, the maximum stress values were always found at the neck of the distal implants. With increasing distal implant tilt, cantilever length reduces depending on the quality of bone. At 30° angulation of distal implant a maximum cantilever length of 16 mm may be given if the quality of bone is D3 but only 8 mm cantilever may be recommended if bone quality is D4. At 40° angulation, 16 mm in D3 bone and 0 mm in D4 bone whereas at 45° angulation, it reduces to 12 mm in D3 bone and no cantilever is recommended with D4 bone. Conclusion: The 45° tilt induced higher stress values at the bone-implant interface, especially in the distal aspect, than the other 2 tilts analyzed. Stress values increased with increased cantilever length which was further influenced by the distal implant tilt and the quality of the bone.

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“…ental implants are most commonly used for rehabilitation of the partially or completely edentulous cases. 1 It is known that missing teeth in the esthetically anterior maxillary area leads to alveolar bone resorption from the labial aspect which compromised the positioning of the implant making it difficult for the clinician to restore with conventional abutments and influencing the final esthetics of prosthesis. 2 The use of angled abutments was recommended to facilitate prosthesis fabrication.…”

Section: Introductionmentioning

confidence: 99%

Screw Retained Implant Supported Zirconia Anterior Fixed Dental Prosthesis with Different Abutment Angulations: Evaluation of Fracture Resistance and Failure Modes

2023

Mansoura Journal of Dentistry

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Objective: To evaluate the effect of different implant-abutment angulations on the fracture resistance of anterior threeunit implant-supported zirconia fixed dental prosthesis. Materials and Methods: Five groups (n=10) were fabricated to represent maxillary anterior three-unit zirconia fixed dental prosthesis supported by two implants with different implant-abutment angulations including group 0 o -0 o , group 0 o -17.5 o , group 0 o -35 o , group 17.5 o -17.5 o and group 35 o -35 o . Zirconia FDPs were cemented by self-adhesive resin cement. All specimens were subjected to thermocycling (5000 X 5 o C/55 o C) and mechanical loading (50 N X 120,000 cycles /1.6Hz). Static loading was applied using the universal testing machine at a crosshead speed of 1 mm/min. One-way ANOVA and Post hoc Tukey test were applied and statistical significance was set at P value < 0.05. Results: All specimens subjected to TCML survived without mechanical failure. Group 0°-35°, group 17.5°-17.5° and group 35°-35° (654.24 ± 81.66 N; 551.34 ± 87.79 N; 382.42 ± 52.07 N, respectively) showed a significant decrease in fracture resistance compared to that in group 0°-0° which showed the highest fracture resistance (759.72 ± 88.33 N) (P=0.04, <0.001, <0.001 respectively). There was no significant difference between group 0°-17.5° (746.04 ± 85.02 N) (P=0.99) compared to that in group 0°-0°. Conclusions:The fracture resistance of zirconia FDPs decreased as implant-abutment angulation increased. Angled abutments of 0 o , 17.5 o , and 35 o could be used as a suitable option for restoration of nonideally placed implants but within limitations, because there was a significant decrease in fracture resistance in group 17.5°-17.5° and group 35°-35°.

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Correlation between abutment angulation and off-axial stresses on biomechanical behavior of titanium and zirconium implants in the anterior maxilla: A three-dimensional finite element analysis study

Cited by 6 publications

References 17 publications

Stress Distributions Created by Short and Regular Implants Placed in the Anterior Maxilla at Different Angles: A Finite Element Analysis

Stress Distributions Created by Short and Regular Implants Placed in the Anterior Maxilla at Different Angles: A Finite Element Analysis

A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths

Screw Retained Implant Supported Zirconia Anterior Fixed Dental Prosthesis with Different Abutment Angulations: Evaluation of Fracture Resistance and Failure Modes

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