Methods Used for Assessing Stresses in Buccomaxillary Prostheses

Goiato, Marcelo Coelho; Tonella, Bianca Piccolotto; Ribeiro, Paula do Prado; Ferraço, Renato; Pellizzer, Eduardo Piza

doi:10.1097/scs.0b013e31819ba3a6

Cited by 20 publications

(9 citation statements)

References 11 publications

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“…The stress pattern on maxillary bone surrounding implants and attachment systems can be obtained by photoelasticity, finite element analysis, and strain gauges measurement. [12][13][14][15][16][17][18] The photoelasticity method has been widely applied in dentistry and allows direct observation of stress distribution on structures due to the ability of some colorless materials to generate colored pattern, also known as isochromatic fringes, during loading with polarized light. 6,12,17 The aim of this photoelastic analysis was to evaluate the stress distribution on conventional and implant-retained palatal obturator dentures with different attachment systems (O-rings, bar-clips and bar-clip systems associated to distally placed O-rings) associated or not with reline material (soft silicone).…”

Section: Introductionmentioning

confidence: 99%

Photoelastic analysis to compare implant-retained and conventional obturator dentures

et al. 2012

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Abstract. The use of photoelastic analysis contributes to the rehabilitation of patients with oral-sinus-nasal sequelae, which in turn affect important functions such as chewing, swallowing, and speech. The prosthetic rehabilitation with implant-retained dentures is a suitable treatment option. The purpose of this study was to verify, by using a photoelastic analysis, the stress distribution in implant-retained palatal obturator dentures (relined or not) associated with different attachment systems (O-ring, bar-clip, and bar-clip associated with distally placed O-rings). Two photoelastic models were obtained from an experimental maxillary cast presenting an oral-nasal communication.One model had two 13-mm length implants placed on the left region. A total of eight colorless maxillary obturators were fabricated and subsequently four of them were relined with soft silicone soft, and three had attachment systems associated. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope and a 100-N load was applied at 10 mm∕s. The results showed that the denture relining influenced the distribution and amount of stress on the models. The O-ring group displayed the lowest stress levels, followed by bar-clip system associated with distally placed O-rings and bar-clip groups.

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Section: Introductionmentioning

confidence: 99%

Photoelastic analysis to compare implant-retained and conventional obturator dentures

et al. 2012

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“…Photoelastic fringes were observed during loading with 100 N in the region of the first molar of each prosthesis and demonstrated a pattern of stress absorption in the region corresponding to bone structure adjacent (or not) to the implants. 19,26,29 The load was applied on the opposite side to the oral-sinus-nasal communication because this is the preferred masticatory side of the patients wearing palatal obturator prosthesis owing to better prosthesis retention and stability. 8 The comparison between the 3 attachment systems of the obturator prostheses and the mucous-supported prosthesis revealed homogeneous stress distribution and lower stress value in the alveolar crest in group 1 (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…17,19,24Y29,31 The photoelasticity method has been widely applied in dentistry and allows direct observation of stress distribution on structures owing to the ability of some colorless materials to generate colored pattern known as isochromatic fringes during loading with polarized light. 19,25,29 The aim of this photoelastic analysis was to evaluate the stress distribution on conventional and implant-retained palatal obturator prostheses with different attachment systems (o'ring, bar clip, and o'ring/bar clip) relined with soft silicone through direct technique.…”

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Photoelastic Analysis of Implant-Retained and Conventional Obturator Prostheses With Different Attachment Systems and Soft Relining

Ribeiro

Goiato

Pellizzer

et al. 2011

Journal of Craniofacial Surgery

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Complete and partial loss of maxillary bone may jeopardize oral physiology and generate complications as oral-sinus-nasal communication. Palatal obturator prostheses are a treatment alternative for rehabilitation of these patients. The aim of this study was to assess stress distribution, through photoelasticity, on palatal obturator prostheses associated with different attachment systems (o'ring, bar clip, and o'ring/bar clip) of implants and submitted to relining. Two photoelastic models were fabricated according to an experimental maxillary model with oral-sinus-nasal communication. One model did not present implants, whereas the other included 2 implants with 13.0 mm in length in the left ridge. Four colorless maxillary obturator prostheses were fabricated and relined with soft silicone. One of these prostheses presented no attachment system, whereas the remaining prostheses included attachment systems adapted to the implants. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope during loading with 100 N at 10 mm/s. The results were based on observation during the experiment and photographic records of stress on the photoelastic model. The bar clip system exhibited the highest stress concentration followed by o'ring/bar clip and o'ring systems. The attachment systems presented different stress distribution with greater concentration surrounding the implants and homogenous stress distribution on the photoelastic model without implants. The highest concentration of fringes occurred, in ascending order, with o'ring, o'ring/bar clip, and bar clip systems.

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“…O método é amplamente usado no âmbito científico, sua aplicação se basea nos preceitos da óptica que permitem avaliar e mensurar a distribuição de tensão em estruturas submetidas a forças internas ou externas (MAIA et al, 2011). A pratica é possibilitada por materiais incolores, que sob carregamento e observados por luz polarizada emitem padrões de cores designados como franjas isocromáticas (MARKARIAN et al, 2007;GOIATO et al, 2009).…”

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Análise fotoelástica comparativa entre pilares protéticos sólidos e de parafuso passante para implantes com conexão cônica instalados em diferentes profundidades ósseas

Provinciatti¹

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Low-intensity stresses contribute to bone remodeling, while high intensity stresses cause bone resorption, below implant-abutment junction in dental implants. The occlusal overload affects the physiology of bone tissue, disrupting the balance between new formation and resorption. As a result of the disharmony, gaps arise in the crestal bone, creating a favorable environment for the proliferation of pathogens and fiber accumulation. With the continued overloading and the permanence of microorganisms, the bone support is impaired, resulting in implant failure. In normal loading conditions the tapered connection implants enables a homogeneous distribution of stresses. The subcrestal positioning of the prosthetic platform determines the transfer of stresses to distant areas from the cortical bone. This study used photoelastic analysis to evaluate the stress distribution in experimental models in conical abutment connection implants placed in equicristal position, 1.5 mm and 3.0 mm subcrestal positions. Rehabilitations were proposed for single prosthetic ceramic crowns cemented in standard and regular Ankylos prosthetic abutments with transmucosal height of 1.5 mm, 3.0 mm and 4.5 mm. Implants were placed in the position corresponding to the first lower right molar. According to the chosen situations, sets of implant/abutments were evaluated separately, adjacent to replicas of the second lower right premolar and second lower right molar and just adjacent to replicas of the second right premolar. The load applied to the photoelastic models was 200 Ncm in all cases. In models with dental replicas, distributed occlusal loading was performed; on models with isolated implant, loading was precise in the central and distal fossa of prosthetic crowns. The results showed that the indication of an abutment over another is depended on the presence or absence of a dental element posterior to the prosthetic crown, and of the implant platform depth of the remaining bone crest. In distal extension with subcrestal implants, stress distribution provided by Regular Ankylos prosthetic abutments was better than that provided by the Standard Ankylos abutment. With the presence of the second molar distribution of stress was more efficient with the Standard Ankylos abutment, regardless of the depth of the implant platform. In photoelastic models with distal extension, the platform displacement to a subcrestal position determined lower stress to the bone. Having bilateral proximal contacts, the stress distribution was favored when the implant was placed in a 3.0 mm subcrestal position with Regular Ankylos prosthetic abutments. However, when connected to the Standard Ankylos abutment, implant placed in equicristal position showed better stress distribution than subcrestal implants.

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Methods Used for Assessing Stresses in Buccomaxillary Prostheses

Cited by 20 publications

References 11 publications

Photoelastic analysis to compare implant-retained and conventional obturator dentures

Photoelastic analysis to compare implant-retained and conventional obturator dentures

Photoelastic Analysis of Implant-Retained and Conventional Obturator Prostheses With Different Attachment Systems and Soft Relining

Análise fotoelástica comparativa entre pilares protéticos sólidos e de parafuso passante para implantes com conexão cônica instalados em diferentes profundidades ósseas

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