A mishap in guided surgery for All-on-4� technique: A case report

A 63-year-old male patient, who had a severely resorbed edentulous maxillary arch and partially edentulous mandibular arch decided on the implant-supported fixed treatment option to replace the edentulous maxillary arch. The fully guided implant placement that utilizes the computer-generated guide is more accurate than traditional surgical guides and free-hand placements. The researchers have correlated possible implant failure risk factors with age, sex, smoking, type of edentulism, bone quality and volume, implant location, angulation, diameter, length, and various systemic factors. This case report demonstrated the failure cause of virtually planned anterior implants in All-on-4 and how to manage it by free-hand surgery without surgical guides.

Neutral zone approach for rehabilitation of severely atrophic maxillary and mandibular ridges: A case report / 대한치과보철학회지

The neutral zone technique is an alternative approach for the construction of complete dentures on highly atrophic ridges with history of denture instability. This technique achieves two objectives. First, the teeth will not interfere with the normal muscle function, and second, the force exerted by the musculature against the denture is more favorable for stability and retention. In this case of a 78-years-old female patient with severely atrophic ridges who had been using unstable complete dentures, the neutral zone impression technique was used to increase the stability and the retention of dentures. The neutral zone for both arch was located with modeling compound. After the arrangement of artificial teeth within the neutral zone, the external impression was taken to determine the tissue surface. The final dentures showed enhanced stability and retention and the patient was satisfied with the new dentures with respect to functional and esthetic aspects.

Implantes curtos em diferentes condições clínicas: um estudo retrospectivo (acompanhamento de um a cinco anos) / Short dental implants in different clinical conditions: a retrospective study (1-5 year follow-up)

O objetivo deste estudo retrospectivo foi avaliar o índice de sobrevivência dos implantes curtos em diferentes situações clínicas, com um acompanhamento clínico mínimo de 12 meses. Material e Métodos: no período de setembro de 2005 a dezembro de 2011, implantes curtos (8,5 mm ou inferior) foram instalados em pacientes da clínica dos autores e da clínica da Unifeso, para substituir dentes unitários e múltiplos nas regiões anterior e posterior da maxila e da mandíbula. Todas as áreas implantadas apresentavam uma elevada reabsorção óssea. Resultados: um total de 335 implantes foi instalado, em 107 pacientes (69 mulheres e 38 homens) com idade média de 68 anos (54 a 82 anos). Os implantes instalados foram 54,6% com o comprimento de 6 mm, 40,3% com comprimento de 8,5 mm e 5,1% com comprimento de 7 mm, distribuídos na região anterior (10,4%) e região posterior (89,6%) da maxila e da mandíbula. Foram utilizadas coroas individuais em dez implantes (3,2%), e 299 implantes foram reabilitados com próteses múltiplas parciais e totais (96,8%). Dentre os 299 implantes, 13 (4,2%) foram submetidos à carga imediata. Após um acompanhamento de um a cinco anos, 309 implantes apresentavam-se em função e 26 implantes foram perdidos, atingindo um índice de sobrevivência de 92,2%. Conclusão: os resultados do presente estudo sugeriram que os implantes curtos apresentaram um bom índice de sobrevivência, devendo ser considerados como uma solução previsível para a reabilitação da maxila e da mandíbula, com elevado grau de reabsorção...

The aim of this clinical retrospective study was to assess the survival rate of short implants in different clinical situations with a minimum 12-month follow-up period. Materials and Methods: between September 2005 to December 2011, short dental implants (8.5 mm or shorter) were placed in patients of authors and Unifeso clinics to restore single and multiple teeth in the anterior and posterior jaw regions. All areas were affected by high bone resorption patterns. Results: a total of 335 implants were placed in 107 patients (69 women and 38 men) with a mean age of 68 years (range: 54–82 years). The implants placed were 6 mm (54.6%), 7 mm (5.1%), and 8.5 mm (40.3%) long, distributed in the anterior (10.4%) and posterior (89.6%) regions. Single crowns were placed in 10 implants (3.2%), and 299 implants received multiple partial and complete prostheses (96.8%). From these, 13 implants (4.2%) were submitted to immediate loading. After 1-5 year follow-up period, 309 implants are in function and 26 implants have been lost, achieving a survival rate of 92.2%. Conclusion: the results of this study suggested that short dental implants presented a good survival rate and therefore should be regarded as a predictable solution for the rehabilitation of highly resorbed jaw regions...