| 1. |
- Bressan, E., et al.
(författare)
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Experimental and computational investigation of Morse taper conometric system reliability for the definition of fixed connections between dental implants and prostheses
- 2014
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Ingår i: Proceedings of the Institution of Mechanical Engineers Part H-Journal of Engineering in Medicine. - : SAGE Publications. - 0954-4119 .- 2041-3033. ; 228:7, s. 674-681
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Tidskriftsartikel (refereegranskat)abstract
- Nowadays, dental implantology is a reliable technique for treatment of partially and completely edentulous patients. The achievement of stable dentition is ensured by implant-supported fixed dental prostheses. Morse taper conometric system may provide fixed retention between implants and dental prostheses. The aim of this study was to investigate retentive performance and mechanical strength of a Morse taper conometric system used as implant-supported fixed dental prostheses retention. Experimental and finite element investigations were performed. Experimental tests were achieved on a specific abutment-coping system, accounting for both cemented and non-cemented situations. The results from the experimental activities were processed to identify the mechanical behavior of the coping-abutment interface. Finally, the achieved information was applied to develop reliable finite element models of different abutment-coping systems. The analyses were developed accounting for different geometrical conformations of the abutment-coping system, such as different taper angle. The results showed that activation process, occurred through a suitable insertion force, could provide retentive performances equal to a cemented system without compromising the mechanical functionality of the system. These findings suggest that Morse taper conometrical system can provide a fixed connection between implants and dental prostheses if proper insertion force is applied. Activation process does not compromise the mechanical functionality of the system.
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| 2. |
- Bressan, E., et al.
(författare)
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Microbial Leakage at Morse Taper Conometric Prosthetic Connection: An In Vitro Investigation
- 2017
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Ingår i: Implant Dentistry. - : Ovid Technologies (Wolters Kluwer Health). - 1056-6163. ; 26:5, s. 756-761
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To evaluate in vitro the sealing capability at the prosthetic connection interface of 2 conometric systems. Materials and Methods: Two conometric systems with the same design and different material were used, for a total of 24 samples. Each sample was assembled by a tapered abutment and respective coping. In group A, the copings were made of gold, whereas in group B they were made of PEEK. Three mu L of mix bacterial suspension (Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, and Fusobacterium nucleatum species) was inoculated into the abutment screw hole, and the coping was inserted on the abutment. Samples were immersed into culture tubes and incubated for 24, 48, and 72 hours into anaerobic conditions. Visual evaluation of turbidity was performed at each time point. Qualitative-quantitative assessment using real-time polymerase chain reaction was performed at 72 hours. Any difference between the groups was checked by means of Fisher exact test. Results: Microbial leakage occurred in both groups, and there was no statistically significant difference between groups. Microbial concentration resulted in a presence inferior to 1 x 10(2) copies/mu L in all positive assemblies. Conclusions: Because of the low bacterial count, it can be concluded that a minimal bacterial infiltration may be allowed by conometric interfaces for prosthetic connection.
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| 3. |
- Bressan, E. O., et al.
(författare)
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Five-year prospective study on conometric retention for complete fixed prostheses
- 2019
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Ingår i: European Journal of Oral Implantology. - 1756-2406. ; 12:1, s. 105-113
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To evaluate the reliability of a conometric system for fixed retention of complete prostheses (CPs) on four implants after 5 years of function. Materials and methods: Twenty-five patients with a completely edentulous mandible received four implants supporting a CP. A total of 100 implants were immediately loaded with CPs on conometric abutments. A follow-up of 5 years was observed for each patient. Outcome measures were prosthesis and implant success, complications, probing pocket depth changes, marginal bleeding and plaque changes, and patient satisfaction. Results: One patient dropped-out. In total, 96 implants supporting the 24 CPs completed the follow-up examination at 5 years. No implant failed. Two framework fractures occurred after 4 and 5 years of function. No loss of retention was recorded for the CPs. Mucositis was recorded for two implants after 1 year of prostheses function for two patients, for one implant after 3 years and for two implants after 4 years in different patients and successfully treated with interceptive supportive therapy. No significant differences were found between Plaque Index (P1) at baseline and after 2 years (P = 1.0); similar findings were calculated between P1 at baseline and after 5 years (P = 0.6) of function. At baseline, after 2 and after 5 years, respectively, 69%, 64% and 56% of implants showed a P1 of 0; 31%, 36% and 44% of implants showed a P1 between 1 and 3. Modify Bleeding Index (MBI) was not significantly different both between baseline and after 2 years of function (P = 1.0) and between baseline and 5 years of function (P = 0.5). At baseline, after 2 and after 5 years, respectively, 69%, 65% and 61% of implants showed a MBI of 0; 27%, 28% and 29% of implants showed a MBI of 1; and 4%, 7% and 10% of implants showed a MBI of 2. The mean probing pocket depth was 1.2 +/- 0.4 mm at baseline, 1.2 +/- 0.4 mm after 2 years and 1.4 +/- 0.5 mm after 5 years of function. The differences were not statistically significant between baseline and 2 years (P = 1.0) and between baseline and 5 years (P = 0.1). From the patient satisfaction questionnaire, 85% percent of patients were satisfied from both aesthetic and functional points of view after 5 years of conometric prostheses function. Conclusions: The present implant-supported conometric retention system can be used to give fixed retention to a CP supported by four implants. An adequate metal framework should be provided to the definitive restoration in order to avoid fractures in the long term.
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| 4. |
- Bressan, E., et al.
(författare)
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Ridge Dimensions of the Edentulous Mandible in Posterior Sextants: An Observational Study on Cone Beam Computed Tomography Radiographs
- 2017
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Ingår i: Implant Dentistry. - : Ovid Technologies (Wolters Kluwer Health). - 1056-6163. ; 26:1, s. 66-72
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Tidskriftsartikel (refereegranskat)abstract
- Aims: To evaluate the ridge dimensions of posterior sextant in totally edentulous mandibles. Material and Methods: Cone beam computed tomography scans of 136 patients were retrospectively included for analysis. At sites corresponding to the second premolar (site a) and the mesial and distal root of first molar (sites b and c, respectively), bone height (BH) and bone width (BW) were measured. Results: BH significantly decreased from site a (11.20 +/- 4.03 mm) to site c (10.28 +/- 3.33 mm). Males showed a significantly higher BH compared with females at all sites (P < 0.001), No signifi- cant impact of age on BH was found. BW increased from coronal to apical at all sites. At all height levels, BW increased from mesial to distal (BWc. BWb. BWa). Conclusions: BH decreased from mesial to distal, whereas BW showed an increase. Sex showed a significant impact on BH, with males having on average a 2.8 mm greater height than females, but not on BW. Age did not significantly influence the dimensions of the residual bone crest.
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