1,721,055 research outputs found
GBR in paziente con esiti di sinusite mascellare
No full textDescriveremo la riabilitazione protesica fissa dopo rigenerazione ossea di un caso di sinusite acuta etmoido-mascellare destra riscontrata in una paziente di 40 anni, rivelatosi successivamente all’inserimento di un impianto in regione 1.6 inserito, secondo quanto riferito dalla paziente, contestualmente ad un precedente rialzo di pavimento di seno mascellare per via crestale. Il risultato clinico e radiografico è stabile a 3 anni dal carico protesico implantare
Threaded Implants in the Atrophic Posterior Mandible
No full textPartial edentulism in the posterior mandible is a common clinical issue, particularly with the early loss of molars and premolars. Rehabilitation of patients with this deficiency can be achieved using a removable prosthesis, but this solution does not
guarantee optimal function and is often declined by patients for comfort or psychologic reasons. In addition, denture-associated plaque accumulation can result in further caries in the remaining teeth and damage to the periodontal tissue, and poor denture design can lead to tooth mobility and even tooth loss. For these reasons and the reported successful long-term outcomes with dental implant-supported fixed restorations, this option has become the treatment of choice for the posterior mandible among clinicians and patients alike. As originally prescribed for machine-turned (ie, Brånemark-type, Nobel Biocare) threaded implants, many clinicians still believe that predictably successful treatment requires longer (ie, at least 10 mm) implants in the posterior mandible. However, if the teeth intended for replacement have been missing for many years or if their removal was traumatic (causing excessive bone loss), there may be inadequate bone volume to allow placement of standard-length implants. Deficits in bone can be vertical, horizontal, or both.
This chapter focuses on the use of short and ultra-short moderately rough threaded implants (MRTIs) from several manufacturers for sites with advanced vertical bone atrophy in the posterior mandible in combination with adequate buccolingual alveolar ridge width (Seibert Class II). Guidelines, clinical indications, advantages, and disadvantages are given with a special focus on short and ultra-short implants as an alternative to vertical bone augmentation
Riabilitazione della mandibola posteriore atrofica con impianti corti (4 mm): un case report.
No full textQuesto case report descrive una riabilitazione protesica di successo di una mandibola posteriore atrofica con impianti lunghi 4 mm. Il paziente rifiutava di sottoporsi ad una qualunque chirurgia ricostruttiva, e poiché l’osso disponibile sopra al nervo alveolare inferiore era di soli 5 mm o meno, il paziente è stato trattato con quattro impianti di 4 mm di lunghezza. Quattro mesi dopo l’inserimento degli impianti si è consegnato un provvisorio; dopo altri 4 mesi questo è stato sostituito con una protesi definitiva. L’uso di questi impianti corti consente una soluzione protesica fissa senza necessità di aumentare verticalmente l’osso mandibolare. Questa procedura riduce notevolmente il fastidio intra e postoperatorio per il paziente rispetto alla chirurgia ricostruttiva per inserire impianti più lunghi. Il follow-up è dì 1 anno di carico protesico
Four mm-long versus longer implants in augmented bone in posterior atrophic jaws: 1-year post-loading results from a multi-center randomized controlled trial
No full textReabilitação de mandíbula posterior atrófica com implantes curtos (4 mm): um relato de caso
No full textEste relato de caso descreve uma reabilitação protética sobre implante bem-sucedida de mandíbula posterior atrófica com implantes de 4 mm de comprimento. O paciente recusou ser submetido a qualquer cirurgia reconstrutiva e, como o osso disponível até o nervo alveolar inferior tinha somente 5 mm ou menos, o paciente recebeu quatro implantes de 4 mm de comprimento. Quatro meses depois da instalação dos implantes, uma prótese provisória foi instalada; após quatro meses, ela foi então substituída pela prótese definitiva. O uso desse tipo de implantes curtos permite uma solução protética fixa sem a necessidade de aumentar verticalmente o osso mandibular. Esse processo reduz consideravelmente o desconforto do paciente intra e pós-operatório comparado com a cirurgia reconstrutiva para a instalação de implantes mais longos. O tempo de acompanhamento foi de 1 ano após a carga dos implantes
Combination of allograft blocks and putty in the inlay technique: clinical and histological observations
No full textAim: In case of atrophic posterior mandibles, the inlay bone graft technique showed remarkable results in terms of vertical bone augmentation and the use of allografts seems to be able to accelerate graft integration and therefore implant rehabilitation. Material and Methods: This case reports clinical and histological evaluations of an the inlay augmentation procedure performed with two different forms of allograft. Two cancellous blocks were used at the sides of the grafted area in order to support the crononally-positioned bony segment, whereas putty was placed between the blocks. Three months later, a CT scan demonstrated good graft integration with sufficient bone vertical increase and density. At implants placement, bone core biopsies were taken and histologically processed. During implant placement,
the block was stable with good clinical osteointegration. Histological analysis showed presence of compact bone revealing
areas of demarcation between grafted bone, newly formed bone and bone regeneration areas. Results: The simultaneous use of both blocks and putty cancellous grafts increased clinical and histological outcomes. The presence of the blocks gave stability to the osteotomized bony
segment assuring an adequate bony vertical increase, whereas the putty increased and accelerated the graft integration. Moreover, the bony segment was clinically stable and no bone plates were used to fix it to the basal bone. Conclusion: In this case, after only 3 months from grafting, allografts showed to be effective materials for the reconstruction of the posterior mandible with inlay technique. According to
the preliminary results, this material represent a good clinical alternative to autologous and inorganic bovine bone
Short implants: an alternative to bone augmentation in atrophic patients [Impianti corti: un’alternativa alla rigenerazione ossea in pazienti con atrofia dei mascellari]
No full textOBJECTIVES: To evaluate the current state of the art in the surgical management of the fixed rehabilitations in the vertical atrophies of the jaws. Guidelines and clinical indications will be given, with a special attention to short implants. MATERIALS AND METHODS: Taken into consideration the current scientific literature and evidence, and clinical authors evaluations, the different surgical approaches to patients with vertical bone atrophies of the jaws have been analysed. Particularly, short implants effectiveness and their advantages and disadvantages have been examined. RESULTS: Short implants represent a treatment option faster, cheaper and associated with fewer complications, compared to vertical bone augmentation procedures. CONCLUSIONS: Short dental implants nowadays could represent a reliable and preferable choice to long implants placed in augmented bone
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Immediate loading of post-extractive versus delayed placed single implants in the anterior maxilla: outcome of a pragmatic multicenter randomised controlled trial 1-year after loading.
No full textPURPOSE: To compare the effectiveness of immediate post-extractive single implants with delayed implants, placed in preserved sockets after 4 months of healing. Implants that achieved an insertion torque of at least 35 Ncm were immediately non-occlusally loaded.
MATERIALS AND METHODS: Just after tooth extraction, and in the presence of less than 4 mm of vertical loss of the buccal bone in relation to the palatal wall, 106 patients requiring a single immediate post-extractive implant in the maxilla from second to second premolar were randomly allocated to immediate implant placement (immediate group; 54 patients) or to socket preservation using anorganic bovine bone covered by a resorbable collagen barrier (delayed group; 52 patients), according to a parallel group design at three different centres. Bone-to-implant gaps were to be filled with anorganic bovine bone, however this was not carried out in 17 patients (corresponding to 40% of those who should have been grafted). Four months after socket preservation, delayed implants were placed. Implants inserted with an insertion torque of at least 35 Ncm were immediately loaded with non-occluding provisional single crowns, then replaced after 4 months by definitive crowns. Patients were followed up to 1 year after loading. Outcome measures were implant failures, complications, aesthetics assessed using the pink esthetic score (PES), peri-implant marginal bone level changes and patient satisfaction recorded by blinded assessors.
RESULTS: Nineteen (35%) implants were not immediately loaded in the immediate group versus 39 (75%) implants in the delayed placement group because an insertion torque superior to 35 Ncm could not be obtained. Six patients dropped out 4 months after loading from the delayed group versus none in the immediate group. Two implants failed in the immediate group (6%) versus none in the delayed group, with the difference showing no statistical significance (difference in proportions = 0.04; 95% CI: -0.03 to 0.11; P = 0.187). Eight minor complications occurred in the immediate group and one in the delayed group, and this was statistically significant (difference in proportions = 0.13; 95% CI: 0.03 to 0.23; P = 0.028). At delivery of definitive crowns, 4 months after loading, the mean aesthetic score was 12.8 and 12.6 in the immediate and delayed groups, respectively. At 1 year after loading, the mean aesthetic score was 13.0 and 12.8 in the immediate and delayed groups, respectively. There was no statistically significant difference at 4 months (P = 0.500) and at 1 year (P = 0.615). Marginal bone levels at implant insertion (after bone grafting) were 0.10 mm for immediate implants and 0.02 mm for delayed implants, which did not have a statistically significantly difference (mean difference = 0.08; 95% CI: 0.04 to 0.12; P < 0.001). One year after loading, patients of the immediate group lost on average 0.23 mm and those in the delayed group lost 0.29 mm, the difference being statistically significant (mean difference = -0.06; 95% CI: -0.11 to -0.01; P = 0.036). Patients of both groups were equally satisfied at 4 months as well as at 1 year after loading.
CONCLUSIONS: There are more complications with immediate post-extractive implants in comparison to delayed implants. It seems more difficult to obtain an implant insertion torque superior to 35 Ncm in sockets preserved with anorganic bovine bone after a 4-month healing period than with postextractive sites. The aesthetic outcome appears to be similar for both groups
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