Holographic interferometry method for assessment of static load stress distribution in dog mandible

Campos, Tomie Nakakuki de; Adachi, Lena Katekawa; Chorres, Jose E; Campos, Antônio Carlos de; Muramatsu, Mikiya; Gioso, Marco Antônio

doi:10.1590/s0103-64402006000400003

Cited by 5 publications

(7 citation statements)

References 13 publications

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“…Biomechanical validation of FEM of the mandible can be attempted on synthetic, dry and wet mandibles by using three different options: Strain gauges [39], double exposure holography [30], and laser speckle interferometry [40]. The strain gauge Table 2 Strain measurements recorded from each rosette gauge (e i ), measured in microstrain units.…”

Section: Discussionmentioning

confidence: 99%

“…Validation is an external process that assesses how accurately the computerized model represents the physical system by comparing FEM results with strain gauge results. The FEM was restricted from movement on both angular processes and mandibular condyles, resembling the same boundary conditions developed during lab tests, in order to guarantee the correlation between the strain results from the lab tests and the computational model [30]. Bite force was assumed to be 256 N for the molar position [19], and 100 N for the incisal position in order to compare the models in the lab with those from the computational simulations.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Biomechanics of the Canine Mandible During Bone Transport Distraction Osteogenesis

Zapata

Dechow

Watanabe

et al. 2014

Journal of Biomechanical Engineering

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This study compared biomechanical patterns between finite element models (FEMs) and a fresh dog mandible tested under molar and incisal physiological loads in order to clarify the effect of the bone transport distraction osteogenesis (BTDO) surgical process. Three FEMs of dog mandibles were built in order to evaluate the effects of BTDO. The first model evaluated the mandibular response under two physiological loads resembling bite processes. In the second model, a 5.0 cm bone defect was bridged with a bone transport reconstruction plate (BTRP). In the third model, new regenerated bony tissue was incorporated within the defect to mimic the surgical process without the presence of the device. Complementarily, a mandible of a male American foxhound dog was mechanically tested in the laboratory both in the presence and absence of a BTRP, and mechanical responses were measured by attaching rosettes to the bone surface of the mandible to validate the FEM predictions. The relationship between real and predicted values indicates that the stress patterns calculated using FEM are a valid predictor of the biomechanics of the BTDO procedures. The present study provides an interesting correlation between the stiffness of the device and the biomechanical response of the mandible affected for bone transport.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Biomechanics of the Canine Mandible During Bone Transport Distraction Osteogenesis

Zapata

Dechow

Watanabe

et al. 2014

Journal of Biomechanical Engineering

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“…(ii) Holography has a range of dentistry applications [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], including for the qualitative study of dental structures, the evaluation of elastic deformations of soldered gold joints, and the measurement of elastic deformation of prosthodontic appliances. It was also applied to evaluate tooth displacements, the centers of rotations of the teeth, the deformation of human skulls, the stress and strain in the periodontal ligament and alveolar bone after a certain force application -the latter aspects in orthodontics [9][10][11][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…It was also applied to evaluate tooth displacements, the centers of rotations of the teeth, the deformation of human skulls, the stress and strain in the periodontal ligament and alveolar bone after a certain force application -the latter aspects in orthodontics [9][10][11][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Retractions of the gingival margins evaluated by holographic methods

et al. 2015

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The periodontal disease is one of the most common pathological states of the teeth and gums system. The issue is that its evaluation is a subjective one, i.e. it is based on the skills of the dental medical doctor. As for any clinical condition, a quantitative evaluation and monitoring in time of the retraction of the gingival margins is desired. This phenomenon was evaluated in this study with a holographic method by using a He-Ne laser with a power of 13 mW. The holographic system we have utilized -adapted for dentistry applications -is described. Several patients were considered in a comparative study of their state of health -regarding their oral cavity. The impressions of the maxillary dental arch were taken from a patient during his/her first visit and after a period of six months. The hologram of the first model was superposed on the model cast after the second visit. The retractions of the gingival margins could be thus evaluated three-dimensionally in every point of interest. An evaluation of the retraction has thus been made. Conclusions can thus be drawn for the clinical evaluation of the health of the teeth and gums system of each patient.

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“…Current techniques employed to evaluate the biomechanical loads on implants comprise the use of photoelastic stress analysis, two or three-dimensional finite element stress analysis, and holographic interferometry. At home and abroad, holographic interferometry method and beagles had been widely used to study displacement of implants or the stress distribution under static load (Batista et al, 2003;van Leeuwen et al, 2003;Chorres et al, 2005;Campos et al, 2006); however, this method is time-consuming and two-dimensional. Digital laser speckle (DLS) technique, developed from the holographic interferometry method, is real-time and easier to manipulate, but its use in the implant biomechanics area is rare.…”

Section: Introductionmentioning

confidence: 99%

Effect of proximal contact strength on the three-dimensional displacements of implant-supported cantilever fixed partial dentures under axial loading

Peng

Chen

Wang

et al. 2013

J. Zhejiang Univ. Sci. B

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Abstract:Objective: This study investigated the effect of proximal contact strength on the three-dimensional displacements of cantilever fixed partial denture (CFPD) under vertically concentrated loading with digital laser speckle (DLS) technique. Methods: Fresh mandible of beagle dog was used to establish the implant-supported CFPD for specimen. DLS technique was employed for measuring the three-dimensional displacement of the prosthesis under vertically concentrated loading ranging from 200 to 3 000 g. The effect of the contact tightness on the displacement of CFPD was investigated by means of changing the contact tightness. Results: When an axial concentrated loading was exerted on the pontic of the implant-supported CFPD, the displacement of the CFPD was the greatest. The displacement of the prosthesis decreased with the increase of contact strength. When the contact strength was 0, 0.95, and 3.25 N, the displacement of the buccolingual direction was smaller than that of the mesiodistal direction but greater than that of the occlusogingival direction. When the force on the contact area was 6.50 N, the mesiodistal displacement of the prosthesis was the biggest while the buccolingual displacement was the smallest. Conclusions: The implantsupported CFPD is an effective therapy for fully or partially edentulous patients. The restoration of the contact area and the selection of the appropriate contact strength can reduce the displacement of the CFPD, and get a better stress distribution. The most appropriate force value is 3.25 N in this study.

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Holographic interferometry method for assessment of static load stress distribution in dog mandible

Cited by 5 publications

References 13 publications

Biomechanics of the Canine Mandible During Bone Transport Distraction Osteogenesis

Biomechanics of the Canine Mandible During Bone Transport Distraction Osteogenesis

Retractions of the gingival margins evaluated by holographic methods

Effect of proximal contact strength on the three-dimensional displacements of implant-supported cantilever fixed partial dentures under axial loading

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