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Showing 3 results for Dental Implants

Mehrdad Panjnoush, Nakisa Eil, Yasaman Kheirandish, Niloufar Mofidi, Ahmad Reza Shamshiri,
Volume 5, Issue 2 (9-2016)
Abstract

Introduction: Nowadays, using implants as a choice in patient's treatment plans has become popular. The aim of this study was to determine the prevalence of mandibular lingual and maxillary buccal concavity, mean concavity depth and angle and its relation to age and gender.

Materials and Methods: In 200 CBCT, concavity depth and angle were measured in 2 mm superior to the inferior alveolar canal in the mandibular first molar area and in 1 mm distance from nasal floor in the midpoint region of maxillary lateral incisor and canine. Concavity depth and angle relationships with age and gender have been evaluated using Spearman Correlation and a t-test.

Results: Mean and standard deviation of lingual concavity, concavity angle and ridge angle in mandible were 1.3±1.54 mm, 15.45±16.19 and 10.13±6.1. Mean and standard deviation of buccal concavity and concavity angle in maxilla were 5.35±1.03 mm and 30.6±5.75. Mandibular concavity depth was zero in 44% of subjects and more than zero in 56%. Results were more than 3 mm in maxillary samples. There was a linear relationship between mandibular concavity depth and age equaled to -0.27, p=0.007 and for mandibular concavity angle and age equaled to -0.25, p=0.01. There was no significant relationship between mandibular ridge angle and age. In maxilla, there was no linear relationship between age and gender with any other variables

Conclusion: It is necessary to provide more information on these regions' anatomy using CBCT cross sections before implant placement.


Faezeh Atri, Ehsan Mohammadian Amiri,
Volume 6, Issue 2 (9-2017)
Abstract

Full mouth rehabilitation with fixed implant supported prostheses is one of the challenging treatments, because important factors in aesthetic and function should be considered. Implants' alignments and locations should be planned before the insertion unless the improper inclination and location of implants would lead to difficulties in patient's comfort, oral hygiene problem and inability to reconstruct the acceptable functional and aesthetical prosthesis.
This clinical report described the step by step prosthetic treatment procedure of full mouth rehabilitation and 1-year follow-up of a patient who underwent 10 and 8 implants in upper and lower jaw respectively, which were unaligned and malpositioned. In the cases of improper alignment and position of implants, modified prosthetic design with consideration of biomechanical principles should be incorporated to overcome the limitations.

Iman Barati, Hojatollah Yousefimanesh, Dariush Johari,
Volume 12, Issue 2 (9-2023)
Abstract

Introduction: Dental implants are widely used to replace missing teeth. The crown-to-implant ratio is a determinant factor for the survival/success of dental implants. The aim of this study was to investigate the effect of diameter, length, and crown-to-implant ratio on the stress distribution around dental implants using the finite element analysis (FEA) method.
Materials & Methods: In this in vitro study, the cone-beam computed tomography (CBCT) of a patient with an edentulous mandible was used to create a three-dimensional model. The model was uploaded into the Mimics software and the contour model of the mandible was produced. The final file was uploaded into the ABAQUS software for FEA. The mandibular first molar was simulated and reconstructed using six models and in accordance with implant dimensions (diameter: 4.1 and 4.8mm; Length: 6,8,10mm) and axial forces of 200 N and angles of 0°, 15°, 30°, and 45°. The von Mises stress was used to determine the yielding of materials under multifaceted loading from the results of uniaxial tensile tests.
Results: The maximum value of von Mises stress, in all six models was observed in the implant, crown, and cortical and cancellous bones, respectively (491.7, 303.5, 205.8,52 MPa). The highest stress value in all models was observed in the implant neck and the stress levels were decreased towards the apical implant. The stress value around the implant increased with increasing crown-to-implant ratio (69.2, 77.6, 92.9 model <1, 1>1 respectively).
Conclusion: The stress value around the implant increased with increasing crown-to-implant ratio and inclination angle and decreasing diameter and length.


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