A method for constructing teeth and maxillary bone parametric model from clinical CT scans

Vasco, Marco Antonio Amorim; Souza, Juliana Tonini Araújo de; Casas, Estevam Barbosa de Las; Silva, Ana Lydia Reis de Castro e; Hecke, Mildred Ballin

doi:10.1080/21681163.2014.889579

Cited by 15 publications

(12 citation statements)

References 20 publications

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“…A three-dimensional mandible model was used in this study and obtained following the reconstruction steps described in a Vasco et al study [21] (Figure 3a). The required geometric changes were performed in SolidWorks 2013 (Dassault Systemes, Solidworks Corps, Waltham, MA, USA).…”

Section: Methodsmentioning

confidence: 99%

A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

García-Braz

Prados-Privado

Zanatta

et al. 2019

JCM

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Background: The goal of this study was to analyze the stress distribution on two types of extra-short dental implants with 5 mm of length: An internal hexagon (IH) and morse taper connection (MT). Methods: The three-dimensional model was composed of trabecular and cortical bone, a crown, an extra-short dental implant and their components. An axial load of 150 N was applied and another inclined 30° with the same magnitude. Results: Stress concentrations on the IH implant are observed in the region of the first threads for the screw. However, in the MT implant the highest stress occurs at the edges of the upper implant platform. Conclusions: In view of the results obtained in this study the two types of prosthetic fittings present a good stress distribution. The Morse taper connections presented better behavior than the internal in both loading configurations.

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Section: Methodsmentioning

confidence: 99%

A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

García-Braz

Prados-Privado

Zanatta

et al. 2019

JCM

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“…Rehabilitation of the atrophic maxilla with the all-onfour concept has been established in the literature. 2,8,9 The use of trans-sinus implants has also previously been reported by other authors; however, other authors have used conventional implants up to 15-mm long. 6,7,12,13 The particularity of the present technique lies in the use of extra-long trans-sinus implants up to 24 mm, described in 2017.…”

Section: Discussionmentioning

confidence: 67%

“…6,7,12,13 The particularity of the present technique lies in the use of extra-long trans-sinus implants up to 24 mm, described in 2017. 8 However, biomechanical analyses of these rehabilitations are still inadequate in the literature, a factor that prompted the present study. Given the results, very close stresses on the peri-implant tissues were observed in the two models, with a discrete rise in values in the model with trans-sinus implants.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical behavior of atrophic maxillary restorations using the all-on-four concept and long trans-sinus implants: A finite element analysis

Carvalho

Francischone

et al. 2021

J Dent Res Dent Clin Dent Prospects

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Background. Maxillary bone atrophy with a considerable amount of pneumatization and anterior expansion of the maxillary sinus might be a situation limiting oral rehabilitation with osseointegrated implants. Therefore, the present study aimed to biomechanically evaluate two rehabilitation techniques for maxillary bone atrophy: all-on-four and long trans-sinus implants. Methods. Two three-dimensional models consisting of atrophic maxilla with four implants were simulated. In the M1 model, two axially inserted anterior implants and two tilted implants, 15 mm in length, placed tangential to the maxillary sinus’s anterior wall were used. In the M2 model, two axially inserted anterior implants and two trans-sinus tilted implants, 24 mm in length, were used. For the finite element analysis (FEA), an axial load of 100 N was applied on the entire extension of the prosthesis, simulating a rehabilitation with immediate loading. The peri-implant bone and the infrastructure were analyzed according to the Mohr-Coulomb and Rankine criteria, respectively. Results. The results were similar when the stresses on peri-implant bone were compared: 0.139 and 0.149 for models 1 and 2, respectively. The tension values were lower in the model with trans-sinus implants (27.99 MPa). Conclusion. It was concluded that the two techniques exhibited similar biomechanical behavior, suggesting that the use of long trans-sinus implants could be a new option for atrophic maxilla rehabilitation.

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“…It was noted that the screws closest to the zone of separation between body and ramus underwent higher stress accumulation, which can be explained by the greater tendency of these segments to separate in that region; thus, stress concentration is higher closer to the osteotomy site. Since stress is calculated by dividing the force by the area considered, 21 it follows that the larger the area of distribution, the lower the stress peak in this area. The screws farthest from the zone of separation between body and ramus underwent the lowest stresses.…”

Section: Discussionmentioning

confidence: 99%

Stress Generated in Customized Versus Non-Customized Rigid Fixation Plates in a Simulation of Mandibular Advancement

Pinto

Ramos²,

Basting

2020

Craniomaxillofacial Trauma & Reconstruction Open

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Study design: A finite element method used to virtually analyze the distribution of stresses in human mandible. Objective: The aim of this study was to evaluate the distribution of stresses in 1 customized and 2 non-customized plates used in simulated procedures of mandibular advancement and rigid fixation after bilateral sagittal split osteotomy of the mandibular ramus. Methods: The model used was obtained from a tomograph of an 18-year-old patient, and the simulation involved advancing the mandibular body by 4.75 mm. The plates used were Osteomed, double-row medium; Stryker, standard straight; and Traumec, custom-machined double straight. Virtual models of the mandible and the installed plates were generated and submitted to finite element analysis. Two 100-N loads, 1 anterior and 1 posterior, were applied perpendicular to the occlusal plane. Results: In the Osteomed and Traumec plate models, the stress peaks occurred near the separation zone of the mandible, adjacent to the connections. In the Stryker plate model, the stress peak occurred in the region between the screws. Conclusions: The Stryker plate was associated with the lowest risk of compromising bone repair, followed by the Traumec and Osteomed plates. Stress concentration was related to plate length and to the existence of a connection between the upper and lower portions of the fixation used.

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A method for constructing teeth and maxillary bone parametric model from clinical CT scans

Cited by 15 publications

References 20 publications

A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

Biomechanical behavior of atrophic maxillary restorations using the all-on-four concept and long trans-sinus implants: A finite element analysis

Stress Generated in Customized Versus Non-Customized Rigid Fixation Plates in a Simulation of Mandibular Advancement

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