Fracture rate and risk factors associated with the fracture of narrow diameter implants: A long-term retrospective analysis.

OBJECTIVES: The objective of this long-term retrospective study was to evaluate the fracture rate and the risk factors associated with the fracture of 3.3 mm narrow diameter implants (NDIs). MATERIALS AND METHODS: A total of 524 records of patients rehabilitated with 3.3 mm NDIs between 1997 and 2015 were assessed. Data on patients, implants, and prostheses were collected, and descriptive analysis of the variables was performed. NDIs were separated into 2 groups: "fractured" and "non-fractured", and a multilevel logistic regression model was applied to identify the risk factors associated with NDI fracture. RESULTS: Eighty-four patients were removed from the analysis for interrupting follow-up or presenting failures other than fractures. Of the 440 patients included (64.66 ± 13.4 years), 272 were females (61.8%), and 168 males (38.2%), and mean follow-up time was 129 ± 47.1 months. Of the 1428 NDIs, 15 (1.05%) in 9 patients (2.04%) fractured during the studied period. Ten fractures (66.66%) happened in 6 patients (66.66%) showing signs of parafunction. NDI with modified sandblasted, large grit, acid-etched surface was the only implant variable to show a protective statistical significance (p = .0439). CONCLUSIONS: NDI fracture was a rare event in the studied sample. NDIs manufactured with modified sandblasted, large grit, acid-etched surface may provide extra protection against NDI fracture. Patient-specific factors and implant characteristics should be carefully considered to limit the risk of fracture of 3.3 mm NDIs.

Alveolar ridge bone changes in patients treated with the split-crest technique with simultaneous implant placement: A retrospective longitudinal observational study.

OBJECTIVES: To investigate long-term alveolar ridge bone changes in patients treated with the split-crest technique (SCT) with simultaneous implant placement. MATERIALS AND METHODS: Alveolar ridge width (ARW) was measured with a caliper immediately before (ARW1) and after SCT (ARW2) with a caliper. Existing CBCT scans taken at least 5 years postoperatively were used to assess the healed ARW (ARWF), buccal bone thickness (BBT), and lingual/palatal bone thickness (L/PBT) at 0, 3, and 5 mm apically from implant platform level (IPL). The distance between IPL and buccal bone crest (IPL-BBC) was also measured. Findings were compared with Wilcoxon and Student's t tests (p < .05). RESULTS: Records of thirty patients with 85 implants were included. Eleven patients (31 implants) presented CBCT scans taken in two separate occasions, resulting in 116 measurements. Tomographic follow-up ranged from 5 to 18 years (11.5 ± 4.18 years). Mean ARW increased from 3.2 ± 0.6 to 6.6 ± 0.48 mm after SCT, but significantly reduced overtime to 4.46 ± 0.83 mm (ARWF) (p < .0001). Mean BBT was 0.5 ± 0.9, 1.3 ± 0.9, and 2.0 ± 1.2 mm, while mean L/PBT was 0.9 ± 0.7, 1.6 ± 0.9, and 2.1 ± 1.0 mm at 0, 3, and 5 mm from IPL, respectively. IPL-BBC distance varied up to 8.7 mm (1.4 ± 2.0 mm), with 56/116 measurements (51/85 implants) showing IPL-BBC = 0 mm. CONCLUSION: Although SCT with simultaneous implant placement can predictably increase ARW postoperatively, ARW tended to significantly reduce over time, due to reductions in BBT and L/PBT, especially coronally. Nonetheless, 60% of the implants still presented some buccal bone at IPL.

Narrow- and regular-diameter implants in the posterior region of the jaws to support single crowns: A 3-year split-mouth randomized clinical trial.

OBJECTIVES: The objective of this 3-year split-mouth randomized controlled clinical study was to compare narrow-diameter implants (NDIs) to regular-diameter implants (RDIs) in the posterior region of the jaws (premolars and molars) in regards to (i) the marginal bone level (MBL) and (ii) implant and prosthesis survival and success rates. MATERIAL AND METHODS: A total of 22 patients were included in the study. Each patient received at least one implant of each diameter (Ø3.3 and Ø4.1 mm), placed either in the maxilla or mandible to support single crowns. A total 44 implants (22 NDIs and 22 RDIs) were placed and included in the study. Twenty-one implants were placed in the premolar, whereas 23 were placed in molar areas. Radiographic evaluations to access the MBL were performed immediately after implant placement, 1 and 3 years after implant loading. Peri-implant clinical variables including probing pocket depth (PPD) and bleeding on probing (BoP) were obtained after crown delivery, 1 and 3 years after loading. Furthermore, the survival and success rates of the implants and prosthesis were also evaluated. RESULTS: Twenty patients were able to complete the study. There was no statistically significant difference regarding MBL between groups at implant placement (p = .084), 1-year (p = .794) and 3-year (p = .598) time intervals. The mean peri-implant bone loss at 3-year follow-up was -0.58 ± 0.39 mm (95% CI: -0.751 to -0.409) and -0.53 ± 0.46 mm (95% CI: -0.731 to -0.329) for NDIs and RDIs, respectively. BoP was present at 15% and 10% of NDIs and RDIs, respectively, at 3-year follow-up. PPD >5 mm was observed in 5% and 0% of the implants of NDIs and RDIs, respectively, at 3-year follow-up. At the 3-year examination, the implant success rates were in the NDIs and RDIs sites, respectively, 95% and 100%. The corresponding values for prosthesis success rates were 90% for NDIs and 95% for RDIs. CONCLUSION: The present study demonstrated that NDIs placed to support single crowns in the posterior region did not differ to RDIs in regards to MBL, implant survival, and success rates.

The success rate of immediate implant placement of mandibular molars: a clinical and radiographic retrospective evaluation between 2 and 8 years.

BACKGROUND: Dental implants, indicated for re-establishing both mastigatory and aesthetic functions, can be placed in the sockets immediately after tooth extraction. Most studies investigate the anterior and upper regions of the dental arch, whereas few examine longitudinal appraisal of immediate implant installation in the mandibular molar region. OBJECTIVE: The aim of this retrospective study was to evaluate the success rate of immediate dental implants placement in mandibular molars within a follow-up period as long as 8 years. MATERIALS AND METHODS: Seventy-four mandibular molar implants after non-traumatic tooth extraction between 2002 and 2008 were examined in the study. All implants were evaluated radiographically immediately after prosthesis placement, 1 year after implantation, and by the end of the experimental period, in 2010. Clinical evaluation was done according to [Albrektsson et al. (1986) The International Journal of Oral & Maxillofacial Implants, 1, 11-25] success criteria for marginal bone loss. The mean bone losses, calculated as the difference between the final evaluation measures and those taken by the end of the first year of implant, were compared using Kruskal-Wallis test with a significance level of 5%. RESULTS: All implants presented clinical and radiographic stable conditions, that is, 100% success rate. Significant bone loss was not found between final evaluation and that of the first functional year (P > 0.05). CONCLUSION: Immediate implant placement of mandibular molars proved to be a viable surgical treatment given the high success rate up to 8 years after implantation.

Maxillary sinus grafting with fresh frozen allograft versus bovine bone mineral: A tomographic and histological study.

We evaluated histologically and tomographically the effects of fresh frozen bone allograft (FFB) or bovine bone mineral (BBM) in maxillary sinus floor augmentations. In total, 30 maxillary sinuses from 30 patients (mean age = 51.17 ± 10.86 years) underwent sinus augmentation. Patients were divided in two test groups (15 sinuses each). The first group was grafted with allograft bone, and the second group received bovine bone mineral. After 6 months, bone samples from each group were collected for histological examination. Implant survival rates were 97.78% (FFB group) and 100% (BBM group) 6 months after functional loading. Median volumetric reductions of 31.2% (11.33-40.56) and 12.22% (9.91-20.59) were observed in the FFB and BBM groups, respectively. Comparisons between the groups for differences in initial and final volumes of bone (p = 0.015) and the rate of resorption (p = 0.009) showed statistically significant differences. The FFB group showed osteoblastic cells in close contact with osteoid matrix, connected through bridges between allograft bone particles and new bone formation. The BBM group showed BBM particles in close contact with new bone, with visible osteoid matrix bridges and osteoblastic cells surrounding it. None showed signs of acute or chronic inflammatory infiltrate. Despite better results with BBM, both FFB and BBM in maxillary sinus augmentation resulted in high percentages of new bone formation, and allowed implant placement with a low rate of failure of osseointegration at a 6-month follow-up.

Retratamento de fratura complexa em mandíbula atrófica com instalação imediata de implantes dentários / Retreatment of Atrophic Mandibular Complex Fracture with Immediate Dental Implants

O objetivo deste trabalho consiste em descrever um caso de retratamento de fratura complexa em mandíbulaatrófica, onde foi realizada a correção cirúrgica da fratura através da técnica de redução aberta, utilizandominiplaca de titânio do tipo compressão, e, concomitantemente após a fixação interna rígida da fratura, foraminseridos implantes dentários. O tratamento instituído é relatado e discutido com relação às principais causaspotenciais das fraturas em mandíbula atrófica, aos meios cirúrgicos para sua reconstrução, ao uso das técnicasde enxertia como também à possibilidade de recuperação imediata da função mastigatória através do usodos implantes dentários. Somando-se ao relato e à discussão, também será apresentada a reabilitação protéticatotal do caso e acompanhamento clínico por um período de sete anos

Retratamento de Fratura Complexa em Mandíbula Atrófica com Instalação Imediata de Implantes Dentários / Retreatment of Atrophic Mandibular Complex Fracture with

O objetivo deste trabalho consiste em descrever um caso de retratamento de fratura complexa em mandíbula atrófica, através do qual foi realizada a correção cirúrgica da fratura através da técnica de redução aberta, utilizando mini-placa de titânio do tipo compressão e, concomitantemente após a fixação interna rígida da fratura, foram inseridos implantes dentários. O tratamento instituído é relatado e discutido com relação às principais causas potenciais das fraturas em mandíbula atrófica, aos meios cirúrgicos para sua reconstrução, ao uso das técnicas de enxertia como também à possibilidade de recuperação imediata da função mastigatória através do uso dos implantes dentários. Somando-se ao relato e à discussão, também será apresentada a reabilitação protética total do caso e o acompanhamento clínico por um período de sete anos

Método conservador para as fraturas do côndilo da mandíbula durante o período de crescimento: revisäo da literatura com relato de oito casos / Conservative method for treatment of fractures of the mandibular condyle in the growth period: review of literature with eight cases report

Foram tratados oito pacientes que tiveram fratura do côndilo da mandíbula durante o período de crescimento, pelo método conservador. Este método foi discutido em relaçäo às suas vantagens e desvantagens, após uma análise minuciosa de todas as referências bibliográficas sobre o assunto, de possível acesso. Estes pacientes foram reexaminados durante um período médio de dois anos de acompanhamneto, constituindo-se o mais novo com a idade de três anos e seis meses e o mais velho com a idade de quatorze anos, na época da fratura. Estes pacientes foram divididos em dois grupos de tratamento: um grupo tratado por imobilizaçäo maxilo-mandibular, durante um período de até três semanas, e um outro, que teve retorno imediato aos hábitos normais com dieta apenas líquida. Os controles com período médio de seis em seis meses, eram feitos mediante fotografias da face e exames radiográficos específicos para visualizaçäo do côndilo. Observamos resultados muito satisfatórios, com os pacientes com padräo de crescimento dentro da normalidade, com boa relaçäo oclusal, sem assimetria mandibular ou facial e com a maioria dos pacientes com remodelamento condilar completo

Hipertrofia do músculo masseter: revisão da literatura com apresentação de técnica cirúrgica optativa / Masseteric muscle hypertrophy: literature review with presentation of optative surgical technique

Após a revisão bibliográfica dos principais relatos e estudo das várias técnicas cirúrgicas apresentadas por vários autores para tratamento e correção da hipertrofia do músculo masseter, desde 1880 como primeiro relato feito por Legg, passamos a estudar os fatores etiológicos, a incidência e o melhor método para tratamento. Através da comprovação por exame clínico e radiográfico, diagnosticamos um caso de hipertrofia bilateral do músculo masseter. Corrigimos o defeito usando técnica extra-oral, e, realizamos apenas a osteotomia das excrecências ósseas (aletas) da região do gônio, sem remoção de nenhuma fibra muscular modificando assim a técnica. Não foi feito nenhum desgaste dentário no período pós-operatório e decorridos 3 anos da cirurgia o paciente apresentava-se com contorno facial normal, padrão oclusal mantido, sem qualquer sintoma e na radiografia de mandíbula não apresentava nenhum novo crescimento na região

Meios de proteção dos raios-x: análise comparativa das condições de utilização e proteção radiológica entre profissionais da Odontologia / X-Rays protection measures: comparative analysis of conditions of radiographic protection utilization by dental professionals

Neste trabalho, os autores realizaram uma pesquisa para examinarem as condições e meios de uso das radiações ionizantes nos consultórios odontológicos, no que se refere aos meios de proteção. Foi aplicado um questionário com cerca de 70 (setenta) profissionais das diversas especialidades constituindo aproximadamente 12//dos dentistas do estado, não incluindo nenhum docente. Este questionário usado foi comparado com estudos similares feito por MELO com cerca de 1//dos profissionais de São Paulo, compreendendo 200 entrevistados, a metade sendo docentes e, estudo feito por FELIX com cerca de 60 profissionais da cidade de João Pessoa. Após a coleta dos dados obtidos, podemos concluir que o nível de conhecimento dos meios de proteção, para com o paciente, profissional e auxiliares foram similares com a cidade de São Paulo, mas já uma maior conscientização dos profissionais da cidade de Aracaju, proporcionalmente. Mesmo assim, necessita uma maior divulgação e conscientização dos profissionais com relação as recomendações da FEDERATION DENTAIRE INTERNATIONALE