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Qualitative and quantitative analysis of the tensions generated by metaloplastic fixed crowns, splinted and non-splinted, in the posterior region of the mandible, rehabilitated with regular and short implants, by digital image correlation method.

Grant number: 12/09808-8
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): November 01, 2012
Effective date (End): December 31, 2013
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Maria da Gloria Chiarello de Mattos
Grantee:Raniel Fernandes Peixoto
Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


The use of dental implants in dentistry to restore function and aesthetics of partial edentulous patients has been increasing. In cases of severe vertical bone loss, especially in mandible's posterior areas, using short implants and reduced diameter associated with metaloplastic fixed crowns and united can be an alternative to bone graft surgery and better force transmission to the adjacent bone, respectively. Many methods have been used to verify tensions generated around the dental implants, however, the digital image correlation (DIC) has advantages as regards the possibility of evaluating the the tensions' dynamic in three dimensions (3D) and continuously using images taken over time, during occlusal loading. Due to low amount of studies that verify the stress distribution around the implant by the method of DIC, this study aims to evaluate qualitatively and quantitatively the biomechanical performance of splinted and non-splinted metaloplastic fixed crowns, screwed on cone Morse implants of different lengths positioned on the mandible posterior regions, by DIC method. Four photoelastic models (Araldite) will be made simulating a mandibular free end saddle, with the tooth 44 in resin (Luxatemp) and the teeth 45, 46 and 47 replaced by implants with 4 mm in diameter. Group 1 (G1) will be formed by two conventional length implants (11 mm; Titamax Cortical CM, Neodent) replacing the teeth 45 and 46, and one short implant (5 mm; Ws Cortical CM; Neodent) replacing 47. Group 2 (G2) will have one implant with 11 mm (45) and two implants with 5 mm (46 and 47). Group 3 (G3) will be rehabilitated by three implants of 5 mm and the group 4 (G4) for three implants of 11 mm in length. Splinted and non-splinted metaloplastic crowns will be screwed on the abutments. Different occlusal loads will be performed over the crowns: 100N in punctiform (45 mesial and 47 distal) and 150N in occlusal distributed. Surface tensions (horizontal [xx] and shear [xy]) will be calculated based on displacement and compared qualitatively and quantitatively by image correlation software (Davis 7.2, LaVision Inc.).

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PEIXOTO, RANIEL F.; MACEDO, ANA P.; MARTINELLI, JANISSE; LAPRIA FARIA, ADRIANA C.; TIOSSI, RODRIGO; RIBEIRO, RICARDO F.; DE MATTOS, MARIA DA G. C.. A Digital Image Correlation Analysis of Strain Generated by 3-Unit Implant-Supported Fixed Dental Prosthesis: An In Vitro Study. IMPLANT DENTISTRY, v. 26, n. 4, p. 567-573, . (12/09808-8, 11/01506-0)
PEIXOTO, RANIEL FERNANDES; HONORIO TONIN, BRUNA SANTOS; MARTINELLI, JANISSE; MACEDO, ANA PAULA; CHIARELLO DE MATTOS, MARIA GLORIA. In vitro digital image correlation analysis of the strain transferred by screw-retained fixed partial dentures supported by short and conventional implants. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, v. 103, . (12/09808-8)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PEIXOTO, Raniel Fernandes. Analysis of the stresses generated by short and conventional implants rehabilitated with splinted and non-splinted fixed prosthesis by digital image correlation method. 2013. Master's Dissertation - Universidade de São Paulo (USP). Faculdade de Odontologia de Ribeirão Preto (PCARP/BC) Ribeirão Preto.

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