1,721,124 research outputs found
Autogenous onlay bone grafts vs. alveolar distraction osteogenesis for the correction of vetically deficient edentulous ridges : a 2-4 year prospective study on humans
No full textAbstract
Objectives: The purposes of this study were to compare: (a) autogenous bone grafts (ABG)
and distraction osteogenesis (DO) for their ability in correcting vertically deficient
mandibular ridges and their capability in maintaining over time the vertical bone gain
obtained before and after implant placement; and (b) the survival and success rates of
implants placed in the reconstructed or distracted areas.
Material and methods: In a 2-year period (2001–2002), 17 patients presenting with
vertically atrophied partially edentulous mandibles requiring implant-supported prosthetic
rehabilitation, were included in this study. Patients were randomly assigned to two groups.
Eight patients (group 1) were treated with ABG harvested from the mandibular ramus,
while nine patients (group 2) were treated by means of DO. In group 1, patients received
implants 4–5 months after the reconstructive procedure, while in group 2 implants were
placed at the time of distraction device removal (approximately 3 months after the
completion of distraction). A total of 19 endosseous implants were placed in group 1, and
21 implants were placed in group 2 patients. For both groups, after an additional 3–5-
month period, prosthetic rehabilitation was started.
Results: Bone resorption before implant placement was significantly higher in group 1
(P1⁄40.01), while no statistically significant differences were found between the two groups
as far as survival and success rates of implants and peri-implant bone resorption after the
start of prosthetic loading were concerned.
Conclusion: The results suggested that: (a) both techniques may effectively improve the
deficit of vertically resorbed edentulous ridges; (b) survival and success rates of implants
placed in the reconstructed/distracted areas are consistent with those of implants placed in
native bone
Micro-morphometric assessment of titanium plasma-sprayed coating removal using burs for the treatment of peri-implant disease
No full textThis study evaluated, in vitro, the effectiveness of diamond and carbide burs, and bur sequences to remove the plasma-sprayed titanium coating from IMZ fixture surfaces. Fifteen polishing procedures were tested. They included the use of 12, 16, 30 bladed carbide burs or bevered carbide burs and 30, 15, 8 urn mean-particles-size diamond burs. The treated surfaces were evaluated with profilometer and SEM. Worn burs and titanium debris produced by the grinding were observed with SEM. All procedures produce smoother surfaces than baseline plasma-sprayed surfaces for both Ra and Rz(DIN) parameters (P<0.001). A roughening effect of the 8 urn mean-grit diamond bur and 30 bladed burs were noted. The single carbide burs produce polished surfaces affected by waviness. Waviness was minimized by sequence or diamond bur use. The carbide bur blades were variously damaged after their use. In contrast, the grit of diamond burs was observed to be clogged by titanium debris whose amount seemed to be inversely related to the diamond mean particle size. Debris produced by diamond burs was granular whereas that produced by carbide bladed burs showed needle or flake morphology. In conclusion, the most effective titanium plasma sprayed removal were obtained by 30 urn and 15 μm mean-particle-size diamond burs, i.e. 30 urn plus 15 μm diamond burs and carbide 12 plus 16 bladed burs used in sequence
Dental implants placed in grafted maxillary sinuses: a retrospective analysis of clinical outcome according to the initial clinical situation and a proposal of defect classification
No full textObjective of the study: To present a classification of maxillary defects necessitating sinus
floor elevation procedures (SFEPs) with two objectives: (a) to propose a standardization of
surgical procedures according to initial type of atrophy and (b) to allow the evaluation of
the success/survival rates of implants placed in the grafted areas according to the initial
situation.
Materials and methods: Nine-hundred and fifty-two consecutive SFEP were performed on
692 patients. Initial defects were classified according to a new classification, which
considered not only residual bone height below the sinus but also the width of the alveolar
crest and horizontal/vertical intermaxillary relationship. Results were evaluated according
to the different classes. The sinuses were grafted with autogenous bone taken from intra-
oral or extra-oral sites: 579 SFEP were associated with vertical and/or horizontal onlay grafts
to correct concomitant alveolar ridge deficits. A total of 2037 implants were inserted into
the grafted sinuses either immediately or 4–6 months later. Three to 6 months afterwards,
implants were loaded. The mean follow-up was 59 months (range: 12–144 months).
Results: The success rate of the reconstructive procedures varied between 93.2% and
100%, according to class of atrophy; the overall survival and success rates of implants were
95.8% and 92.5%, respectively, whereas the survival and success rates according to class of
atrophy varied between 90% and 97.6%, and between 85.4% and 95.5%, respectively.
Lower success rates were found in classes presenting with more severe atrophy.
Conclusion: The results obtained demonstrated that sinus floor elevation, alone or in
association with reconstructive procedures with autogenous bone grafts, is a reliable
procedure to allow implant placement in atrophic edentulous maxillae, irrespective of the
initial clinical situation. However, it must be underlined that the success rates of
reconstructive procedures and implants differ according to class of atrophy, showing lower
success rates in classes presenting with more severe atrophy
Internal contamination of a 2-component implant system after occlusal loading and provisionally luted reconstruction with or without a washer device
No full text
In vitro corrosion study by EIS of an equiatomic NiTi alloy and an inplant grade ASTM F138 stainless steel.
No full textAlveolar distraction osteogenesis vs. vertical guided bone regeneration for the correction of vertically deficient edentulous ridges : a 1-3-year prospective study on humans
No full textThe purpose of this prospective study was to compare vertical guided bone regeneration (GBR) and vertical distraction osteogenesis (DO) for their ability in correcting vertically deficient alveolar ridges and their ability in maintaining over time the vertical bone gain obtained before and after implant placement. Eleven patients (group 1) were treated by means of vertical GBR with autogenous bone and e-PTFE membranes, while 10 patients (group 2) were treated by means of DO. In group 1, six patients received implants at the time of GBR (subgroup 1A), while five patients had implants placed at the time of membrane removal (subgroup 1B). In group 2, implants were placed at the time of distraction device removal. A total of 25 implants were placed in group 1 and 34 implants were placed in group 2 patients. Three to 5 months after implant placement, patients were rehabilitated with implant-borne dental prostheses. The following parameters were evaluated: (a) bone resorption of the regenerated ridges before and after implant placement; (b) peri-implant clinical parameters 1, 2, and 3 years after prosthetic loading of implants; (c) survival and success rates of implants. Bone resorption values before and after implant placement were significantly higher in group 1. The results suggested that both techniques may improve the deficit of vertically resorbed edentulous ridges, although distraction osteogenesis seems to be more predictable as far as the long-term prognosis of vertical bone gain is concerned. Implant survival rates as well as peri-implant clinical parameters do not differ significantly between the two groups, whereas the success rate of implants placed in group 2 patients was higher than that obtained in group 1 patients
Biologically active nanoparticles of a carbonate-substituted hydroxyapatite, process for their preparation and composition incorporating the same
No full textBrevettazione della sintesi industriale di carbonato-idrossiapatite zinco sostituita da utilizzare come principio attivo in paste dentifrice aventi la capacità di rimineralizzare lo smalto dental
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