Incidence of surgical and prosthetic complications in total edentulous patients rehabilitated by the All-on-Four® technique: a retrospective study

ABSTRACT: Objective: To analyze the level of survival and the main complications presented by total edentulous patients after the All-on-Four® treatment, through a retrospective analysis. Methods: The medical records of 32 rehabilitated patients, between 2010 to 2018 were selected, presenting a total of 128 implants with subsequent fixed prostheses. The following variables were analyzed: gender, age, patient's systemic condition, time of implant installation, number of implants, and surgical and prosthetic complications. Results: The procedures were performed over on average 5.9 years ago and were more prevalent in female patients(59.6%). Out of the 32 patients selected 75% presented some systemic alteration, with hypertension being the most frequent disease. Regarding the implant placement, the rehabilitation in the mandible was more prevalent(62.5%), while in the maxilla(31.2%), and in the bimaxillary region(6.25%). As for the complications, out of 128 implants installed, 13 presented loss of osseointegration, leading to a survival rate of 90.44% (94.3% mandible and 83.3% maxilla). Furthermore, 15 surgical and 20 prosthetic complications were diagnosed. Among the surgical complications, the most frequent were loss(5-33%) and bone fracture(3-20%), while the most frequent prosthetic complications included loosening and/or or fracture of the prosthetic component and prosthetic fracture (6-30%). Conclusion: All-on-Four® is a procedure that has a high survival rate.

Three-Dimensional Upper Airway Assessment in Treacher Collins Syndrome.

OBJECTIVES: The purpose of this investigation was to assess the pharyngeal dimensions and the craniofacial morphology of individuals with Treacher Collins syndrome (TCS) when compared to vertical skeletal class II individuals. It is our hypothesis that the upper airways of individuals with TCS are reduced in view of the skeletal pattern and the maxillomandibular dysmorphologies. MATERIALS AND METHODS: Cone-beam computed tomography scans of 26 individuals had the pharyngeal volume (V) and minimal cross-sectional area (mCSA) evaluated. Study group (TCS) was formed by 13 scans of patients with TCS (7 males and 6 females; 20.2 ± 4.7 years). Control group (CG) assembled 13 scans of nonaffected individuals with the same type of skeletal pattern (2 males and 11 females; 26.6 ± 5.4 years). Cephalometric data of maxillomandibular position, maxillomandibular dimensions, and growth pattern were assessed. Statistical analysis (P ≤ .05) included Student t test and Pearson correlation coefficient. RESULTS: Although reduced, pharyngeal V and mCSA of TCS were not statistically different from the CG. On both groups, mCSA was mostly at the oropharyngeal level. Individuals with TCS presented retrognathic chin, reduced maxillomandibular dimensions, and increased clockwise rotation of the palatal plane. Maxillary and mandibular lengths were correlated with pharyngeal V and mCSA. CONCLUSIONS: The pharyngeal dimensions of individuals with TCS are impacted by the micrognathia and retrognathia. In association with the skeletal pattern, the reduction of the airways, although not statistically significant, may explain the increased prevalence of airways disorder in this syndrome.

Management of Zygomatic Fixture Complication Case Using Extra-Short Implants.

The oral rehabilitation of a patient with atrophic maxilla is one of the main challenges in implant-supported rehabilitations. The implant placement in the posterior region of the maxilla is limited by a deficiency of bone quantity and quality, besides the anatomic restriction of the maxillary sinus. The use of zygoma fixtures, anchoraged in the zygomatic bone, is a useful technique to enable the full arch rehabilitation. However, complications related to this procedure bring a lot of difficulty in solving. This study presents the use of extra-short implants as a strategy to treat a patient in whom the zygoma fixture and the fixed prosthesis failed, associated with sinusitis and alveolar bone loss.

Tomographic Evaluation of Prevalence, Position, and Diameter of the Intraosseous Branch of the Posterior Superior Alveolar Artery in Fully Edentulous Individuals.

The objective of this study was to evaluate the presence, position, and diameter of the intraosseous branch (IObr) of the posterior superior alveolar artery in fully edentulous patients. Two-hundred five computed tomography scans of fully edentulous patients were analyzed. The presence of the IObr was investigated in the coronal plane at the lateral wall of the maxillary sinus. In patients in whom the IObr was detected, the artery diameter was measured, and the distance from the artery to the bone crest of the alveolar ridge, the maxillary sinus floor, and the distance of the maxillary sinus floor to the bone crest of the alveolar ridge were measured as well. A descriptive statistical analysis of these parameters was conducted. The IObr was identified in the maxillary sinus in 105 tomography images (51.2%), and its diameter varied between 0.8 and 3.3 mm (1.29 ±â€Š0.49 mm). The IObr presented with an artery diameter less than 1 mm in 29% of the patients, between 1 and 2 mm diameter in 61% of the patients and with a diameter larger than 2 mm in 10% of patients. Regarding the IObr topography, the distance from the artery to the floor of the maxillary sinus was 9.62 ±â€Š4.59 mm, and the distance from the artery to the top of crestal bone was 15.15 ±â€Š4.47 mm. At least 10% of edentulous patients are at risk of bleeding complications during interventions in the maxillary sinus.

Influence of rapid- and slow-rate resorption collagen membrane in maxillary sinus augmentation.

OBJECTIVE: To evaluate the effects of low- and rapid-resorption-rate bioabsorbable collagen membranes in maxillary sinus augmentation procedure in rabbits considering Schneiderian membrane (SM) reaction and bone tissue formation. MATERIALS AND METHODS: Eighteen male adult rabbits underwent bilateral maxillary sinus augmentation with particulate bovine hydroxyapatite to be divided into three groups, as follows: Group C - control, no membrane; Group RR - rapid resorbable collagen membrane; and Group SR - slow-resorbable collagen membrane. The animals were euthanized after 30 and 120 days for specimen's removal to be prepared and analyzed under light microscopy, histomorphometry, and immunohistochemistry for Runx2 and VEGF labeling. RESULTS: Histopathology evaluation presented similar healing pattern among the groups with a satisfactory response of SM, both at day 30 and day 120. Bone histomorphometry did not reveal significant differences among the groups, as well as immunohistochemistry analysis, which presented intense immunolabeling for both proteins in all groups. CONCLUSIONS: The presence of both membranes did not negatively interfere in bone formation and remodeling, and the focal mild inflammatory reaction caused by their degrading process did not impair the reconstructive procedure.

A influência de sintomas da disfunção temporomandibular na força máxima de mordida em indivíduos com deformidade dentofacial / The influence of temporomandibular dysfunction symptoms on maximum bite force in individuals with dentofacial deformity

RESUMO Introdução Indivíduos com deformidade dentofacial (DDF) apresentam comprometimento na oclusão, que pode alterar o desempenho mastigatório e, consequentemente, a força de mordida, não tendo sido encontrados estudos que considerassem a relação entre disfunção temporomandibular (DTM) e força de mordida, nessa população. Objetivo Verificar se a presença de sintomas de DTM influencia a força máxima de mordida (FMM) em indivíduos com DDF. Métodos Participaram do estudo 60 indivíduos, 30 com DDF (GDDF) e 30 com oclusão normal (GC). Para avaliação da DTM, foi aplicado um questionário anamnésico (QA), contendo 10 questões que permitem a classificação quanto à presença e grau de sintomas da DTM. A FMM foi avaliada utilizando-se um transdutor de força mandibular, integrado ao eletromiógrafo EMG System 810c. Foram realizados três registros da força de mordida, com duração de 10 segundos cada. Foi aplicado o coeficiente de correlação de Spearman, com nível de significância de 5%. Resultados Os resultados do QA demonstraram que, no GDDF, houve maior ocorrência de sintomas de DTM, em relação ao GC. Foi observado menor FMM em indivíduos com DDF, comparativamente ao GC. Além disso, foram constatadas correlações negativas e significantes entre os escores obtidos na aplicação do QA e a FMM, ou seja, quanto maior a gravidade dos sintomas da DTM, menor o valor da força de mordida. Conclusão A presença e gravidade dos sintomas da DTM influenciaram a FFM nos individuos com DDF, demonstrando a necessidade de atuação interdisciplinar durante todas as fases do tratamento ortocirúrgico.

ABSTRACT Introduction Individuals with dentofacial deformity (DFD) show impairment in dental occlusion, which may alter the masticatory performance and, consequently, the bite force. No research was found on the relationship between temporomandibular disorders (TMD) and bite force for this population. Purpose To determine if the presence of TMD symptoms influence the maximum bite force (MBF) in individuals with DFD. Methods Sixty individuals were evaluated, 30 with DFD (GDFD) and 30 with normal occlusion (CG). The TMD was assessed by an anamnesis questionnaire (AQ) containing 10 questions that allow classification of the presence and degree of signs and symptoms of TMD. MBF was assessed using a mandibular force sensor, of the EMG System 810c electromyograph. Three records of bite force were obtained, with 10-second duration each. The Spearman correlation coefficient was used, at a significance level of 5%. Results The results of AQ showed higher prevalence of TMD symptoms in GDFD in relation to CG. Also, lower MBF was observed in subjects with DFD compared to CG. In addition, negative and significant correlations were found between scores obtained in the application of AQ and the MBF; therefore, the higher the severity of TMD symptoms, the lower the bite force. Conclusion The presence and severity of TMD symptoms influenced the MBF in individuals with DFD, demonstrating the importance for interdisciplinary intervention during all stages of surgical-orthodontic treatment.

Facial and occlusal esthetic improvements of an adult skeletal Class III malocclusion using surgical, orthodontic, and implant treatment.

The aim of this clinical report is to describe the complex treatment of an adult Class III malocclusion patient who was disappointed with the outcome of a previous oral rehabilitation. Interdisciplinary treatment planning was performed with a primary indication for implant removal because of marginal bone loss and gingival recession, followed by orthodontic and surgical procedures to correct the esthetics and skeletal malocclusion. The comprehensive treatment approach included: (1) implant removal in the area of the central incisors; (2) combined orthodontic decompensation with mesial displacement and forced extrusion of the lateral incisors; (3) extraction of the lateral incisors and placement of new implants corresponding to the central incisors, which received provisional crowns; (4) orthognathic surgery for maxillary advancement to improve occlusal and facial relationships; and finally, (5) orthodontic refinement followed by definitive prosthetic rehabilitation of the maxillary central incisors and reshaping of the adjacent teeth. At the three-year follow-up, clinical and radiographic examinations showed successful replacement of the central incisors and improved skeletal and esthetic appearances. Moreover, a Class II molar relationship was obtained with an ideal overbite, overjet, and intercuspation. In conclusion, we report the successful esthetic anterior rehabilitation of a complex case in which interdisciplinary treatment planning improved facial harmony, provided gingival architecture with sufficient width and thickness, and improved smile esthetics, resulting in enhanced patient comfort and satisfaction. This clinical case report might be useful to improve facial esthetics and occlusion in patients with dentoalveolar and skeletal defects.

Prótese nasal implantorretida por magnetos ­ relato de caso com cinco anos de acompanhamento / Magnet-retained nasal prosthesis ­ case report with 5-year follow-up

O objetivo do presente estudo foi relatar, por meio de um caso clínico, a reabilitação de uma paciente com uma prótese nasal implantorretida. A mesma possuía 68 anos de idade e foi encaminhada para a reabilitação nasal pela equipe que realizou a cirurgia oncológica de um tumor de pele na região do seu nariz. A paciente reportou queixa com relação à estética da face e problemas no convívio social. Foi proposta reabilitação com prótese nasal, com implantes osseointegráveis associados ao sistema de retenção por magnetos. Após cinco anos e dez meses, três novas próteses foram fabricadas devido a queixas da paciente em relação à descoloração da peça. Na última consulta, a prótese foi removida e inspecionada, e se constatou problemas na higienização, motivo das pigmentações escurecidas na superfície interna da peça e do exsudato no tecido mole ao redor dos pilares protéticos. Foram realizadas a limpeza da barra e do tecido mole, e a confecção de novas próteses nasais implantorretidas à base de silicone elastomérico, além de instrução sobre a necessidade de higienização. Constatou-se que próteses nasais implantorretidas à base de silicone elastomérico são eficientes e seguras para a reabilitação de defeitos na região do nariz. Além disso, é extremamente necessário que o profissional transmita aos pacientes a necessidade de uma higienização satisfatória, solicitando retornos periódicos para obter o máximo do desempenho clínico de suas próteses e implantes.

The aim of present study was to report the rehabilitation of a patient with magnet-retained nasal prosthesis. A 68-year-old female patient was referred to nasal rehabilitation by the surgical team that performed the removal of a skin nose tumor. The patient complained about her facial aesthetics and also reported fearing social interactions. The rehabilitation with nasal prosthesis associated with osseointegrated implants, and retained by magnets was proposed to the patient. After 5 years and 10 months, 3 new prostheses have been fabricated because the patient complained about their discoloration. In the last check-up, the prosthesis was removed and visual inspection revealed lack of hygiene maintenance, which resulted in dark pigments in the intaglio surface as well as exudate in the peri-implant soft skin. The prosthetic components and soft tissue were cleaned, the fabrication of new magnet-retained nasal prosthesis was performed and instructions about the necessity of oral hygiene were also transmitted. The implant-retained nasal prosthesis is an effi cient and safe method for the rehabilitation of defects in the nasal area. Furthermore, it is extremely necessary that clinicians advise patients to perform satisfactory hygiene maintenance and periodic controls in order to obtain long-term success in such cases.

Orthodontic decompensation in skeletal Class III malocclusion: redefining the amount of movement assessed by Cone-Beam Computed Tomography.

INTRODUCTION: Cone-Beam Computed Tomography (CBCT) is essential for tridimensional planning of orthognathic surgery, as it allows visualization and evaluation of bone structures and mineralized tissues. Tomographic slices allow evaluation of tooth inclination and individualization of movement performed during preoperative decompensation. The aim of this paper was to assess maxillary and mandibular incisors inclination pre and post orthodontic decompensation in skeletal Class III malocclusion. METHODS: The study was conducted on six individuals with skeletal Class III malocclusion, surgically treated, who had Cone-Beam Computed Tomographic scans obtained before and after orthodontic decompensation. On multiplanar reconstruction view, tomographic slices (axial, coronal and sagittal) were obtained on the long axis of each incisor. The sagittal slice was used for measurement taking, whereas the references used to assess tooth inclination were the long axis of maxillary teeth in relation to the palatal plane and the long axis of mandibular teeth in relation to the mandibular plane. RESULTS: There was significant variation in the inclination of incisors before and after orthodontic decompensation. This change was of greater magnitude in the mandibular arch, evidencing that natural compensation is more effective in this arch, thereby requiring more intensive decompensation. CONCLUSION: When routinely performed, the protocols of decompensation treatment in surgical individuals often result in intensive movements, which should be reevaluated, since the extent of movement predisposes to reduction in bone attachment levels and root length.

Orthodontic decompensation in skeletal Class III malocclusion: redefining the amount of movement assessed by Cone-Beam Computed Tomography

Introduction:Cone-Beam Computed Tomography (CBCT) is essential for tridimensional planning of orthognathic surgery, as it allows visualization and evaluation of bone structures and mineralized tissues. Tomographic slices allow evaluation of tooth inclination and individualization of movement performed during preoperative decompensation. The aim of this paper was to assess maxillary and mandibular incisors inclination pre and post orthodontic decompensation in skeletal Class III malocclusion.Methods:The study was conducted on six individuals with skeletal Class III malocclusion, surgically treated, who had Cone-Beam Computed Tomographic scans obtained before and after orthodontic decompensation. On multiplanar reconstruction view, tomographic slices (axial, coronal and sagittal) were obtained on the long axis of each incisor. The sagittal slice was used for measurement taking, whereas the references used to assess tooth inclination were the long axis of maxillary teeth in relation to the palatal plane and the long axis of mandibular teeth in relation to the mandibular plane.Results:There was significant variation in the inclination of incisors before and after orthodontic decompensation. This change was of greater magnitude in the mandibular arch, evidencing that natural compensation is more effective in this arch, thereby requiring more intensive decompensation.Conclusion:When routinely performed, the protocols of decompensation treatment in surgical individuals often result in intensive movements, which should be reevaluated, since the extent of movement predisposes to reduction in bone attachment levels and root length.

Introdução: a tomografia computadorizada de feixe cônico (TCFC) é essencial para o planejamento tridimensional de cirurgias ortognáticas, pois permite a visualização e avaliação de estruturas ósseas e tecidos mineralizados. Os cortes tomográficos permitem avaliar a inclinação dos dentes e individualizar o movimento realizado durante a descompensação dentária.Objetivo: o objetivo do presente estudo foi avaliar a inclinação dos incisivos superiores e inferiores antes e depois da descompensação ortodôntica da má oclusão de Classe III esquelética.Métodos:o estudo foi realizado em seis indivíduos com má oclusão de Classe III esquelética que passaram por tratamento cirúrgico e apresentaram exames de TCFC feitos antes e depois da descompensação ortodôntica. A reconstrução multiplanar foi feita a partir dos cortes tomográficos (axial, coronal e sagital) adquiridos no eixo longitudinal de cada incisivo. O corte sagital foi usado para a realização de medições, e as referências usadas para avaliar a inclinação dentária foram o eixo longitudinal dos dentes superiores em relação ao plano palatino e o eixo longitudinal dos dentes inferiores em relação ao plano mandibular.Resultados:houve uma variação significativa entre a inclinação dos incisivos antes e depois da descompensação ortodôntica. A alteração foi maior na arcada inferior, evidenciando que a compensação natural é mais efetiva nessa arcada, o que exige uma descompensação mais extensa.Conclusão:quando realizados rotineiramente, os protocolos de tratamento para descompensação em pacientes cirúrgicos geralmente resultam em movimentação extensa, que deve ser reavaliada, já que a extensão do movimento predispõe à perda de inserção e à redução do comprimento da raiz.

Ocorrência de disfunção temporomandibular em indivíduos com deformidade dentofacial / The occurrence of temporomandibular disorders in subjects presented with dentofacial deformities

Resumo:OBJETIVO:verificar a ocorrência de disfunção temporomandibular em indivíduos com deformidade dentofacial.MÉTODOS:foram avaliados 60 indivíduos de ambos os gêneros e idade entre 18 e 40 anos (média=27 anos), sendo formados dois grupos, um composto por 30 sujeitos com deformidade dentofacial, em tratamento ortodôntico pré-cirúrgico e um grupo controle constituído por 30 indivíduos com equilíbrio dentofacial, pareados segundo o gênero e a idade com o grupo deformidade. Para avaliação da articulação temporomandibular, foram aplicados o questionário anamnésico de disfunção temporomandibular e o Eixo 1 do Research Diagnostic Criteria for Temporomandibular Disorderspara verificar e classificar o grau e o tipo da disfunção temporomandibular, respectivamente.RESULTADOS:os resultados da aplicação do questionário demonstraram que o grupo com deformidade apresentou maior grau e escore da disfunção que o grupo controle (p<0,01). A partir do Research Diagnostic Criteria for Temporomandibular Disorders verificou-se maior ocorrência de diagnósticos de deslocamento de disco (p=0,02) e de artrite, artralgia e artrose (p<0,01) no grupo com deformidade em relação ao grupo controle.CONCLUSÃO:indivíduos com deformidade dentofacial apresentaram maior ocorrência de disfunção temporomandibular, quando comparados aos indivíduos com equilíbrio dentofacial, na amostra estudada.

Abstract:PURPOSE:to investigate the occurrence of temporomandibular dysfunction in subjects with dentofacial deformity.METHODS:60 subjects of both sexes and aged between 18 and 40 years (mean = 27 years) and formed two groups, one composed of 30 subjects with dentofacial deformity undergoing presurgical orthodontic treatment were evaluated and a control group consisted of 30 individuals with dentofacial balance, paired to dentofacial group, according to gender and age. Anamnestic questionnaire of temporomandibular dysfunction and Axis 1 of Research Diagnostic Criteria for Temporomandibular Disorders were applied, respectively, so as to verify and rate the degree and type of temporomandibular disorders.RESULTS:the results of the questionnaire demonstrated that dentofacial group presented a greater dysfunction degree and score than control group (p <0.01). From the Research Diagnostic Criteria for Temporomandibular Disorders, a greater occurrence of diagnoses involving disc displacement (p = 0.02) and arthritis, arthrosis and arthralgia (p <0.01) for dentofacial group, in relation to control group, was verified.CONCLUSION:individuals with dentofacial deformity had increased incidence of temporomandibular dysfunction, compared with individuals with dentofacial equilibrium, in the sample studied.

Orofacial functions and quality of life in oral health in subjects with dentofacial deformity.

PURPOSE: To investigate the influence of the facial pattern in orofacial functions (OFFs) and quality of life (QoL), and their relationship in individuals with dentofacial deformities (DFD). METHODS: As approved by the Research Ethics Committee, 36 subjects, aged between 18 and 40 years, divided into three groups of seven female and five male participants, i.e., facial pattern I (n=12), pattern II (n=12) and pattern III (n=12), participated in this study. The OFFs were assessed using the MBGR protocol and QoL by the Oral Health Impact Profile (OHIP-14) questionnaire. Comparisons between OFFs and facial patterns were made using the Kruskal-Wallis test, and the correlation between the facial pattern and QoL by means of Spearman's test, considering a 5% significance level. RESULTS: A significant difference (p<0.05) was observed when comparing patterns I and II, and patterns I and III, with no difference between patterns II and III, neither in the OHIP-14 nor in the MBGR. A significant linear correlation (r=0.666; p<0.05) was verified between the MBGR and the OHIP-14, showing that the worse the OFFs, the worse the QoL. CONCLUSION: The facial pattern influenced the performance of the OFFs and the QoL in individuals presenting DFD, with a greater occurrence of changes for patterns II and III, and the worse the OFFs, the worse the QoL in cases with DFD.

Orofacial functions and quality of life in oral health in subjects with dentofacial deformity / Funções orofaciais e qualidade de vida em saúde oral em indivíduos com deformidade dentofacial

PURPOSE: To investigate the influence of the facial pattern in orofacial functions (OFFs) and quality of life (QoL), and their relationship in individuals with dentofacial deformities (DFD). METHODS: As approved by the Research Ethics Committee, 36 subjects, aged between 18 and 40 years, divided into three groups of seven female and five male participants, i.e., facial pattern I (n=12), pattern II (n=12) and pattern III (n=12), participated in this study. The OFFs were assessed using the MBGR protocol and QoL by the Oral Health Impact Profile (OHIP-14) questionnaire. Comparisons between OFFs and facial patterns were made using the Kruskal-Wallis test, and the correlation between the facial pattern and QoL by means of Spearman's test, considering a 5% significance level. RESULTS: A significant difference (p<0.05) was observed when comparing patterns I and II, and patterns I and III, with no difference between patterns II and III, neither in the OHIP-14 nor in the MBGR. A significant linear correlation (r=0.666; p<0.05) was verified between the MBGR and the OHIP-14, showing that the worse the OFFs, the worse the QoL. CONCLUSION: The facial pattern influenced the performance of the OFFs and the QoL in individuals presenting DFD, with a greater occurrence of changes for patterns II and III, and the worse the OFFs, the worse the QoL in cases with DFD. .

OBJETIVO: Verificar a influência do Padrão Facial nas funções orofaciais (FOF) e na qualidade de vida (QV), e a relação entre elas em indivíduos com deformidades dentofaciais (DDF). MÉTODOS: Aprovado pelo Comitê de Ética em Pesquisa. Participaram 36 indivíduos entre 18 e 40 anos de idade, distribuídos em 3 grupos: Padrão I (n=12), Padrão II (n=12) e Padrão III (n=12), sendo 7 mulheres e 5 homens. As FOF foram avaliadas pelo protocolo MBGR e a QV foi aplicado o questionário Oral Health Impact Profile (OHIP-14). Para as comparações entre as FOF e os Padrões Faciais, foi aplicado o teste de Kruskal-Wallis, e para a correlação entre Padrão Facial e QV, o coeficiente de correlação de Spearman, considerando nível de significância de 5%. RESULTADOS: Houve diferença significativa (p<0,05) ao comparar os Padrões Faciais I e II, e os Padrões I e III, não tendo sido encontrada diferença entre os Padrões II e III, tanto para o OHIP-14 como para o MBGR. Verificou-se correlação linear significativa (r=0,666; p<0,05) entre o MBGR e o OHIP-14, demonstrando que quanto piores as FOF, pior também a QV. CONCLUSÃO: O Padrão Facial influenciou o desempenho das FOF e a QV em indivíduos com DDF, com maior ocorrência de alterações para os Padrões Faciais II e III. .

Biomechanical evaluation of resistance to insertion torque of different implant systems and insertion driver types.

PURPOSE: The aim of this study was to quantify the resistance to torque of different implant systems and their connection devices using in vitro torsion tests. MATERIALS AND METHODS: Three internal connection systems, 1 conventional system with internal torque and 1 conventional system with a mounting device used as a control group were tested on 5 groups. RESULTS: Rupture torque (in newton meter): Biomet 3i Certain group 4 showed a statistically significant higher average (2.65 N·m), followed in order by Biomet 3i Osseotite group 5 (2.18 N·m), Bonelike group 2 (1.80 N·m). Angle deformation/rupture: all groups obtained similar values, without significant differences. Elastic limit (in newton meter): Bonelike group 2 (1.06 N·m) showed similar behavior to group 1 (1.39 N·m) (Nobel Biocare), without significant differences, whereas Bonelike group 3 showed a significantly lower value (0.93 N·m). Maximum torque (in newton meter): Biomet 3i Certain group 4 showed significantly higher values in relation to other groups (2.80 N·m). CONCLUSIONS: The greater contact area the system is built on, the greater resistance against insertion torque, as internal hexagon implants with a greater contact area and external hexagon implants using a mounting device showed higher resistance to insertion torque.

Controle motor oral e funções orofaciais em indivíduos com deformidade dentofacial / Oral motor control and orofacial functions in individuals with dentofacial deformity

Objetivo Verificar se há relação entre o controle motor oral e as funções orofaciais em indivíduos com deformidade dentofacial (DDF). Métodos Participaram 16 indivíduos entre 18 e 40 anos, média de 28,37 anos, sendo sete indivíduos padrão II (três mulheres e quatro homens) e nove, padrão III (cinco mulheres e quatro homens). Foi realizada avaliação da diadococinesia (DDC) das emissões /pa/, /ta/, /ka/ e /pataka/. As funções de mastigação, deglutição e fala foram analisadas por consenso entre três fonoaudiólogas especialistas na área, a partir da filmagem, utilizando o protocolo MBGR. A correlação entre os resultados da DDC e das funções orofaciais foi obtida por meio do teste de Spearman. Resultados Foi observada correlação positiva entre os parâmetros de instabilidade da DDC na emissão do “pa” e “ka” e a função de mastigação. Houve correlação positiva entre deglutição e DDC para a emissão do “pa” no que se refere à instabilidade das emissões e, quanto à velocidade, houve correlação negativa para a média da taxa da DDC e correlação positiva para a média do período da DDC na emissão do “pa”. Quanto à fala, houve correlação negativa para a emissão do “pa”, para parâmetro de instabilidade. Conclusão O controle motor oral mostrou-se relacionado à gravidade da alteração das funções de mastigação e deglutição, no que se refere aos parâmetros instabilidade e velocidade da DDC. .

Purpose To determine the correlation between oral motor control and orofacial functions in individuals with dentofacial deformity (DFD). Methods Sixteen individuals from 18 to 40 years, (average 28.37 years) participated. Seven individuals were class II (three women and four men) and nine were class III (five women and four men). They were evaluated for diadochokinesis (DDK) using the emissions /pa/, /ta/, /ka/ and /pataka/. The chewing, swallowing, and speech functions were filmed and analyzed by three speech specialists, using the MBGR protocol. The correlation results between DDK and the orofacial functions were obtained through the Spearman test. Results A positive correlation was observed between the DDK instability parameters in issuing the “pa” and “ka” and the chewing function. There was a positive correlation between swallowing and DDK for “pa” emission regarding the instability. As for the speed, there was a negative correlation for the DDK mean rate and a positive correlation for the average DDK period at “pa” emission. As for the speech, there was a negative correlation for “pa” emission for the instability parameter. Conclusion The oral motor control was related to the severity of the change in chewing and swallowing functions regarding the DDK speed and instability paramenters. .

Impact of orthodontic decompensation on bone insertion.

There has always been concern in determining the relationship between orthodontic tooth movement and the consequent biological costs to the periodontium and tooth root. The possibility of evaluating the tooth and bone morphology by CBCT allows more accurate analysis of qualitative and quantitative aspects of these processes. This paper presents a case report of a 20-year-old male patient with Class III malocclusion and hyperdivergent facial pattern, who was surgically treated. A significant amount of labial movement of mandibular incisors was performed during orthodontic treatment before surgery. CBCT was used for evaluation of buccal and lingual bone plates before and after tooth decompensation. The changes in the bone insertion level of maxillary and mandibular incisors in the present case encourage a reflection on the treatment protocol in individuals with dentoskeletal discrepancies.

Características respiratórias de indivíduos com deformidade dentofacial / Breathing characteristics of individuals with dentofacial deformity

Objetivo compreender as características respiratórias em indivíduos com deformidades dentofaciais e verificar se há diferenças comparativamente a indivíduos com equilíbrio dentofacial. Métodos participaram 60 indivíduos (18 a 40 anos), 30 portadores de deformidade dentofacial e 30 de um grupo controle. Foi realizada avaliação do Tempo Maximo de Fonação das emissões /a/, /i/, /u/, /s/, /z/ e contagem de números pelo programa Sound Forge (Sony); avaliação da capacidade vital e coordenação pneumofonoarticulatória, pelo espirômetro PonyFx. Os resultados foram comparados pelo teste “t” de Student. Resultados os indivíduos com deformidade dentofacial apresentaram valores de Tempo Maximo de Fonação inferiores aos indivíduos com equilíbrio dentofacial nas emissões: “s” para aqueles com má oclusão esquelética classe II e homens; “z” para indivíduos com má oclusão classe II; contagem de números para os homens. As medidas extraídas pela espirometria foram semelhantes entre os indivíduos com e sem deformidade dentofacial. Conclusão não houve diferenças em relação à capacidade vital e coordenação pneumofonoarticulatória, mas o grupo com deformidade dentofacial apresentou valores reduzidos de Tempo Maximo de Fonação em emissões que contêm fonemas consonantais. .

Purpose comprehend the respiratory characteristics of individuals with dentofacial deformities and verify if there are differences comparatively to individuals with dentofacial balance. Methods participated 60 individuals (18 to 40 years old), 30 with a dentofacial deformities and 30 of a control group. The assessment of the Maximum Phonation Time for the emissions /a/, /i/, /u/, /s/, /z/ and the number counting was evaluated using the program Sound Forge (Sony); the vital capacity and pneumophonic coordination by the PonyFx spirometer. The results were compared by using the “t” Student test. Results the individuals with dentofacial deformities presented lower Maximum Phonation Time values than individuals with dentofacial balance in the emissions: “s” for those with skeletal Class II malocclusion and men; “z” for individuals with Class II malocclusion; number counting for men. The measures extracted by the spirometry were similar between the individuals with and without dentofacial deformities. Conclusion there were no differences regarding the vital capacity and pneumophonic coordination, but the dentofacial deformities group presented lower values of Maximum Phonation Time in the emissions that contain consonant phonemes. .

Autogenous bone grafts contamination after exposure to the oral cavity.

The purpose of this paper was to analyze specimens of autogenous bone block grafts exposed to the oral cavity after ridge reconstructions. Specimens of chronic suppurative osteomyelitis (CSO) of the jaws were used as comparison for bacterial colonization pattern. For this, 5 specimens of infected autogenous bone grafts were used and 10 specimens of CSO embedded in paraffin were stained with Brown and Brenn technique and analyzed under light microscopy. The results showed a similar colonization pattern in both situations, with the establishment of bacterial biofilm and the predominance of Gram-positive bacteria. The conclusion was that the similarity in bacterial distribution and colonization between autogenous bone grafts and CSO stresses the necessity of more invasive procedures for the treatment of the autogenous bone grafts early exposed to the oral cavity.

Análise biomecânica de três tipos de conexões protéticas em implantes dentários de diâmetro reduzido / Biomechanical analysis of three types of prosthetic connections on reduced diameter dental implants

Objetivos: avaliar o comportamento biomecânico de três tipos de conexão protética em implantes de diâmetro reduzido. Material e Métodos: implantes com diâmetro 3,25 mm (plataforma 3,4 mm) foram inseridos em polioximetileno (poliacetal) com torque máximo de 45 Ncm e receberam componentes protéticos calcináveis divididos em três grupos: G1: cone-morse (CM), hexágono interno (HI), e Hexágono externo (HE). Todo os pilares foram sobrefundidos em liga de CoCr e aparafusados com torque de 20 Ncm conforme recomendações do fabricante. A avaliação biomecânica ocorreu conforme a norma ISO 14801-2007: carregamento compressivo 30º e fadiga cíclica (f=15Hz, 5 milhões de ciclos) em ambiente seco. A análise estatística foi conduzida usando-se os testes Anova e Tukey (nível de significância 5%). Resultados: os valores compressivos médios foram: G1 (317,43 N), G2 (559,44 N), e G3 (290,83 N). Diferenças signifi cativas foram vistas entre G1 e G2 (p < 0,001) e entre G2 e G3 (p < 0,0001). Não houve diferença entre grupos no teste de fadiga. Os valores correspondentes foram: G1 (190,80 N), G2 (163,25 N), e G3 (141,77 N). Conclusões: todos os grupos demonstraram desempenho biomecânico aceitável

Objectives: to evaluate the biomechanical behavior of three types of prosthetic abutment connections in reduced implant diameters. Material and Methods: 3.25 mm-diameter dental implants (3.4 mm implant platform) were inserted in polyoxymethylene (polyacetal) resin with maximum torque of 45Ncm and received burnout prosthetic abutments divided into three groups: G1: cone-morse (CM), Internal Hex (IH), and External Hex (EH). All abutments were overcast in a CoCr alloy and fastened to 20 Ncm following manufacturer’s instructions. Biomechanical evaluation was performed according to ISO 14801-2007 standards: 30º compressive and fatigue loading (f = 15 Hz, 5 million cycles) in dry environment. Statistical analysis was conducted with Anova and post-hoc Tukey tests (5% signifi cance level). Results: mean compressive values were: G1 (317.43 N), G2 (559.44 N), and G3 (290.83 N). Signifi cant differences were seen between G1 and G2 (p < 0.001) and between G2 and G3 (p < 0.0001). No differences among groups were seen for fatigue loading. The correspondent endurance limits were: G1 (190.80 N), G2 (163.25 N), and G3 (141.77 N). Conclusions: all groups demonstrated acceptable biomechanical performance.

Avaliação biomecânica da resistência ao torque de inserção de diferentes sistemas de implantes e ligas de titânio graus 4 e 5 / Evaluation of torsional mechanical resistance of different implant connection systems fabricated with titanium alloys grades 4 and 5

Objetivo: avaliar o limite de resistência de dois diferentes sistemas de grip interno e ligas de titânio para identificar possíveis situações de risco. Material e métodos: foram usados quatro grupos (dez unidades cada), da seguinte forma: 1) implantes de conexão hexagonal externa e liga de titânio grau 4; 2) implantes de conexão hexagonal externa e liga de titânio grau 5; 3) implantes de conexão hexagonal interna e liga de titânio grau 4; 4) implantes de conexão hexagonal interna e liga de titânio grau 5. Chaves de inserção descartáveis foram usadas, e cada conjunto foi submetido ao teste de torção (ASTM F543: 2007) para verificação do torque máximo e valor angular de ruptura. Resultados: os valores médios de torção em cada grupo foram: 203,43 Ncm, 172,65 Ncm, 217,85 Ncm e 181,60 Ncm, respectivamente. Os conjuntos constituídos de liga F67 (grau 4) e conexão morse mostraram maior resistência (teste Anova, p < 0,05). Os valores angulares médios de ruptura foram: 65,76°, 42,18°, 46,30° e 50,52°, respectivamente. Conclusão: os limites de resistência ao torque foram superiores à demanda clínica, o que induz ao raciocínio de que os sistemas são seguros para uso clínico, respeitando seus limites mecânicos. Contudo, o torque excessivo deve ser evitado, em vista do risco de deformação da conexão.