June, 2009, Vol. 11, No. 2

CONTENTS

SCIENTIFIC ARTICLES

Evaluation of dental care and the prevalence of tooth decay among middle-aged and elderly population of Kaunas city
Jurate Zubiene, Simona Milciuviene, Jurate Klumbiene
42-47

Growth factors/cytokines/defensins and apoptosis in periodontal pathologies
Zane Laurina, Mara Pilmane, Ruta Care
48-54

Stress distribution of an internal connection implant prostheses set: A 3D finite element analysis
Regenio Mahfuz Herbstrith Segundo, Hugo Mitsuo Silva Oshima, Isaac Newton Lima da Silva, Luis Henrique Burnnet Junior, Eduardo Goncalves Mota, Liangrid Lutiani Silva
55-59

Intra-articular injection of hyaluronic acid for temporomandibular joint osteoarthritis in elderly patients
Luca Guarda-Nardini, Daniele Manfredini, Marco Stifano, Alberto Staffieri, Gino Marioni
60-65

Evaluation of tensile strength of different configurations of orthodontic retraction loops for obtaining
optimized forces
Miceli Beck Guimaraes Blaya, Graziela Henriques Westphalen, Magali Beck Guimaraes, Luciana Mayumi Hirakata
66-69

© 2009 Stomatologija

Stomatologija 2009; 11 (2): 55-59 255 KB

Stress distribution of an internal connection implant prostheses set: A 3D finite element analysis

Regenio Mahfuz Herbstrith Segundo, Hugo Mitsuo Silva Oshima, Isaac Newton Lima da Silva, Luis Henrique Burnnet Junior, Eduardo Goncalves Mota, Liangrid Lutiani Silva

Summary

Objective. This study evaluated the stress distribution by loads, under a internal connection implant sytem with two sort of abutment screws and prosthetic crown models at ten observation points.

Materials and method: The analysis were made in two models with internal butt joint, and with gold and titanium screw, respectively. The load was 382N with 90º to the occlusal surface and 15º to the implant axis at 4 and 6 mm from the implant center.

Results: In both models, a large amount of stress was located around the implant neck and little stress was concentrated along the abutment screw.

Conclusion: The simulations made suggest that the internal connection protects the abutment screw from the accumulated stresses; however, it exposes the implant walls to these stresses.

---

*Pontificia Universidade Catolica do Rio Grande do Sul, Brazil

Regenio Mahfuz Herbstrith Segundo* – DDS, PhD student

Hugo Mitsuo Silva Oshima* – DDS, PhD, assist. professor, Department of Prosthodontics

Isaac Newton Lima da Silva* – DDS, PhD, assist. professor, Department of Mechanic Engineering

Luis Henrique Burnnet Junior* – DDS, PhD, assist. professor, Department of Dentistry

Eduardo Goncalves Mota* – DDS, assist. professor, Department of Dental Materials, Faculty of Dentistry

Liangrid Lutiani Silva* – Graduate program student

Address correspondence to Regenio Mahfuz Herbstrith Segundo, Pontificia Universidade Catolica do Rio Grande do Sul, Guadalupe 90/601, Jardim Lindoia, Porto Alegre, RS, Brazil, 91050 - 250.

E-mail address: regesegundo@yahoo.com.br