Implant Inclination and Cantilever Length Are Not Associated with Bone Loss in Fixed Complete Dentures: A Prospective Study

Camargo, Bernardo Alievi; Drummond, Luís Gr; Özkömür, Ahmet; Villarinho, Eduardo Aydos; Rockenbach, Maria Ivete Bolzan; Teixeira, Eduardo Rolim; Shinkai, Rosemary Sadami Arai

doi:10.11607/ijp.6022

Cited by 7 publications

(14 citation statements)

References 2 publications

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“…This clinical study was conducted in accordance with the Declaration of Helsinki (Amendment 2009), and this report followed the STROBE guidelines. This study is part of a long‐term prospective project, and the overall clinical protocol was previously described . This study was approved by the University Ethics Committee (CAAE: 69742517.8.0000.5336), and all patients signed an informed consent form.…”

Section: Methodsmentioning

confidence: 99%

“…Radiographic exams were performed after IFCD installation (baseline—BL), and at 1‐ and 3‐year follow‐up sessions (T1 and T3, respectively). Digital periapical radiographs were obtained using the parallel technique, with individualized film holders (Rinn XCP, Dentsply) with putty silicon to standardize the positioning overtime . The X‐ray images were obtained by using a photostimulable phosphor plate (Digora digital system, Optime, Soredex) an X‐ray equipment (SOMMO, Gnatus), with 70 kVp, 7 mA, total aluminum filtration of 3.22 mm, and focus distance of 40 cm.…”

Section: Methodsmentioning

confidence: 99%

“…This study is part of a long-term prospective project, and the overall clinical protocol was previously described. 15,16…”

Section: Methodsmentioning

confidence: 99%

“…Digital periapical radiographs were obtained using the parallel technique, with individualized film holders (Rinn XCP, Dentsply) with putty silicon to standardize the positioning overtime. 16 The X-ray images were obtained by using a photostimulable phosphor plate (Digora digital system, Optime, Soredex) an X-ray equipment (SOMMO, Gnatus), with 70 kVp, 7 mA, total aluminum filtration of 3.22 mm, and focus distance of 40 cm. The exposure times were 0.63 seconds for maxilla and 0.56 seconds for mandible.…”

Section: Digital Periapical Radiographsmentioning

confidence: 99%

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Radiographic changes of trabecular bone density after loading of implant‐supported complete dentures: A 3‐year prospective study

Gerhardt

Villarinho

Rockenbach

et al. 2019

Clin Implant Dent Rel Res

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Background Bone tissues may undergo remodeling under functional mechanical stimuli. Purpose This prospective study on implant‐supported fixed complete dentures (IFCDs) evaluated the radiographic trabecular bone changes in density by means of gray levels and texture analysis variables after up to 3‐year loading. Materials and Methods The sample consisted of digital periapical radiographs of 63 distal implants of hybrid IFCDs installed in 30 patients (22 women, mean age of 62 ± 7.8 years). Digital periapical radiographs were taken after prosthesis installation, and 1 and 3 years after IFCD loading. Longitudinal images of each implant were superimposed, and the same regions of interest were selected for measurement of gray levels statistics (mean gray levels, SD, and coefficient of variation [CV]) and texture parameters (correlation, contrast, entropy, and angular second moment). Data were analyzed by mixed regression models. Results Mean gray levels increased for 1 year (P < .05), for 3 years (P < .01) and for maximum bite force (P < .01). The interaction between bruxism and time in 1 year was significant (P < .01) for a decrease in CV. No significant effect of texture analysis variables was found (P > .05). Conclusions The results suggest an increase of radiographic bone density as measured by an increase in mean gray levels and a decrease in CV in IFCD distal implants up to 3 years of loading.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…This study is part of a long-term prospective project, and the overall clinical protocol was previously described. 15,16…”

Section: Methodsmentioning

confidence: 99%

Section: Digital Periapical Radiographsmentioning

confidence: 99%

See 2 more Smart Citations

Radiographic changes of trabecular bone density after loading of implant‐supported complete dentures: A 3‐year prospective study

Gerhardt

Villarinho

Rockenbach

et al. 2019

Clin Implant Dent Rel Res

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show abstract

“…The model was imported by AnsysWorkbench software (ANSYS Inc, Canonsburg, Pennsylvania, USA) into the static structural analysis environment. It was necessary to discretize the model which was performed by using mechanical properties such as modulus of elasticity and Poison's coefficient according to previously published works (Camargo et al, 2018), (Zheng et al, 2012), Dittmer et al (2010.…”

Section: Table 1 -Modulus Of Elasticity and Poison's Coefficient Used To Characterize The Behavior Of The Materialsmentioning

confidence: 99%

Stress analysis of a single prosthesis on a poorly positioned implant

Reis

Brandt

Boaro

et al. 2021

RSD

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The mechanical positioning behavior of a mal-positioned implant was evaluated in the finite element method. Models were created in SolidWorks Professional 2013® software with a single implant rehabilitation. The following were analyzed: Control Group, crown aligned to the implant long axis; Experimental Group, crown shifted 3 mm mesial proximally to the implant axis. Compressive stresses in cortical and medullary bone, and Von Mises stresses in implants and components were evaluated. With 100 N occlusal loading at 5 points. The peak von Mises stresses in the prosthetic screw of the experimental group (138.45 MPa) were 43.60% higher compared to the control group (96.41 MPa). The stresses in the prosthetic pillar were localized in the abutment region and the experimental group showed (875.63 MPa), 28% higher than the control group (683.88 MPa). Regarding the implant, the maximum stress peaks were located in the implant platform and the experimental group showed stress values of (1081.4) MPa and was 26.42% higher than the control 855.39 MPa. The cortical bone tissue of the experimental group showed shear stress values 10.81% higher than the control. The stress values were 151.36 MPa for the experimental group and (136.59 Mpa) for the control. The medullary bone showed shear stress (8.31 MPa) and was 12.29% higher than the control (7.40 MPa). A maximum peak was obtained in the cervical region of the medullary bone, adjacent to the cortical bone. The experimental group with a mal-positioned implant showed the highest maximum stresses for all simulated prosthetic components.

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Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

Dinc¹,

Türkoğlu²,

Selvi

2021

Proc Inst Mech Eng H

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This study aimed to investigate the effects of the different dental implant neck designs, diameters, and inclinations, on the stress distributions at the mandibular crestal bone and implant-abutment complex, using three-dimensional (3D) finite element stress analysis (FEA) method. Finite element models of three-unit fixed partial dentures supported with two same length implants (10 mm), placed on the second premolar and second molar regions, were designed. Eight different models were designed according to the implants’ neck designs (platform switching/traditional), diameters (4.1 mm/4.8 mm) and the tilting angles of the posterior implants (0°/15°). The anterior implants’ widths were 4.1 mm and the neck design of the anterior implants matched the posterior implants. Two types of 100-N loads in vertical and 30° oblique directions were applied separately onto each central fossae and functional cusps of the fixed partial dentures crowns. Algor Fempro Software was used for the simulation and evaluation of the stress levels at the implant-abutment complex and the crestal bone. Stress levels measured at the crestal bone were found to be lower for the platform switching models. However, the platform switching design generated higher stress magnitudes within the implant-abutment complex. Inclined placement of posterior implants increased the amount of stress at the crestal bone around both implants. Biomechanically, selection of the largest diameter possible when using tilted platform switched implants may be recommended at the posterior mandible.

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Implant Inclination and Cantilever Length Are Not Associated with Bone Loss in Fixed Complete Dentures: A Prospective Study

Cited by 7 publications

References 2 publications

Radiographic changes of trabecular bone density after loading of implant‐supported complete dentures: A 3‐year prospective study

Radiographic changes of trabecular bone density after loading of implant‐supported complete dentures: A 3‐year prospective study

Stress analysis of a single prosthesis on a poorly positioned implant

Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

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