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Biomedical subjects

C Besimo

Publications and source records attributed to C Besimo.

At least 19 recordsLinked to original sources
PubMed1997

Clinical performance of resin-bonded fixed partial dentures and extracoronal attachments for removable prostheses.

STATEMENT OF PROBLEM: It is important to evaluate the long-term clinical performance of resin-bonded fixed partial dentures and extracoronal attachments for removable prostheses. PURPOSE: A prospective, long-term clinical study was conducted to evaluate the success of resin-bonded fixed partial dentures since 1985 and of resin-bonded extracoronal attachments from 1987. METHODS: Until 1993, a total of 130 resin-bonded fixed partial dentures had been seated in 101 patients, as well as 12 removable partial dentures (RPDs) with 24 extracoronal retainers in 10 patients. The clinical treatment protocol and the laboratory procedures were standardized. By the end of 1993, it was possible to reexamine 98 patients with a total of 127 resin-bonded fixed partial dentures and all 10 patients with removable partial dentures. The average time in function for the resin-bonded fixed partial dentures at the time of examination was 3.4 years and 2.3 years for the removable restorations. RESULTS: During the period of observation, one retainer failed on six of the resin-bonded fixed partial dentures, which represents a failure rate of 4.7%. Debonding of extracoronal attachments was recorded for 8.3% of the total number of retainers. CONCLUSION: The resin-bonded fixed partial denture technique can be considered to be a clinically reliable method of treatment, and permits the expansion of indications beyond a classical three-unit resin-bonded fixed partial denture. Long-term clinical success of removable partial dentures with resin-bonded extracoronal retainers warrants additional clinical studies.

Adolescent↗
PubMed1995

In vitro investigation of various attachments for overdentures on osseointegrated implants.

Primary splinting of fixtures with bar attachments has proved to be clinically effective for overdentures on osseointegrated implants in the edentulous mandible. However, in vitro investigations indicate that a more favourable force transfer to the individual fixtures can be attained by secondary splinting of four implants with conical double crowns. This observation could be confirmed in the present study by measurement of implant deflection in a model of the mandible by means of interferometric optical holography. Telescope crowns with conical interface brought about functionally more even movement characteristics of the implants compared to rigid or jointed bar attachments. Moreover, the conical double crowns always ensured a stable position of the denture in contrast to jointed attachments. These results underscore the need to test conical double crowns clinically as anchors for overdentures on osseointegrated implants.

Crowns↗
PubMed1995

Dental implant treatment planning with reformatted computed tomography.

By using specific software programmes, it is now possible to obtain reformatted CT images of the mandible and maxilla. This facility has proved to be valuable in the planning of fixed and removable suprastructures in implantology. We describe the use of a radiopaque prosthetic template to enable the optimal position and axial inclination of the fixtures in edentulous patients to be established.

Alveolar Process↗
PubMed1994

A new concept of overdentures with telescope crowns on osseointegrated implants.

Primary splinting of fixtures with bar attachments has proven to be clinically effective for overdentures on osseointegrated implants in the edentulous mandible. However, in vitro investigations indicate that a more favorable force transfer to the individual fixtures can be attained by secondary splinting of four implants with tapered telescope crowns, compared to primary splinting with rigid or jointed bar attachments. Moreover, in contrast to jointed attachments, the telescope crowns ensure a stable denture position. These results underscore the need to clinically test telescope crowns as anchors for overdentures on osseointegrated implants. Telescope crowns on four implants allow an optimal restorative concept of overdentures with the bridgelike design of the removable suprastructure.

Crowns↗
PubMed1993

Resin-bonded fixed partial denture technique: results of a medium-term clinical follow-up investigation.

Results of a clinical investigation with cast metal, electrolytically etched, resin-bonded fixed partial dentures (FPDs) are reported. These FPDs were inserted under standardized conditions. The FPDs had been in place and functioning for an average time of 21.4 months. Sixty-five patients with a total of 82 resin-bonded FPDs were followed up. There was a retentive failure in only one FPD. All patients were satisfied from both functional and esthetic points of view. The results of this study indicate that the concept of treatment with resin-bonded FPDs should be considered as an alternative to conventional treatment.

Acid Etching, Dental↗
PubMed1991

[Hybrid prosthesis implant-supported superstructures in edentulous jaw. 1. Case planning].

Dental literature covers a wide range of implant-based denture supports. Based on static/dynamic as well as preventive periodontal considerations, rigidly anchoring the removable superconstruction of hybrid dentures using secondary splinting of four implants with telescope crowns or readymade cap-andpost systems, is generally appropriate in cases where the lower jaw is toothless. This makes possible an impeccable bridgeshaped design for the main part of the dentures, with wide-open inter-implant rincing areas. Clinical experience has shown that, in comparison to bridge dentures or rigid bridgework, secondary splinting in reconstructions greatly simplifies oral hygiene, particularly for elderly patients.

Aged↗
PubMed1991

[Hybrid prosthetic implant supported suprastructures in edentulous mandible. Conus crowns and shell-pin-systems on HA-Ti-implants. 2. Prosthetic construction principles].

Dental literature covers a wide range of implant-based denture supports. Based on static/dynamic as well as preventive periodontal considerations, rigidly anchoring the removable superconstruction of hybrid dentures using secondary splinting of four implants with telescope crowns or readymade cap-andpost systems, is generally appropriate in cases where the lower jaw is toothless. This makes possible an impeccable bridge-shaped design for the main part of the dentures, with wide-open inter-implant rincing areas. Clinical experience has shown that, in comparison to bridge dentures or rigid bridgework, secondary splinting in reconstructions greatly simplifies oral hygiene, particulary for elderly patients.

Crowns↗
PubMed1991

[In-vitro research on the precision of the marginal adaptation of computer-milled titanium crowns (I). Scanning electron microscopy marginal fissure analysis].

The Digitising Computer System (DCS) can be mechanically programmed to produce computer-milled titanium frameworks for veneered ceramic single crowns using three-dimensional computer models. Titanium frameworks were constructed in this way during the present in-vitro investigation involving twelve extracted teeth with shoulder or chamfered preparation. An electron scanning microscope was used to evaluate the marginal accuracy of fit of the cemented crowns. The total length of 42.7 cm comprised by the crowns enabled 397 measuring points to be used. The arithmetical mean marginal leakage for the shoulder preparation amounted to 68.3 +/- 61.1 micrometers, and 95.7 +/- 83.2 micrometers for the chamfered one. From these results, it can be affirmed that the marginal accuracy of fit in constructing crowns by the Digitising Computer System is comparable to that of the conventional method.

Computer Graphics↗
PubMed1991

[The in-vitro study of the marginal fit accuracy of computer-milled titanium crowns. II. A histological-morphometric marginal-gap analysis].

The Digitising Computer System (DCS) can be mechanically programmed to produce computer-milled titanium dentures for veneered ceramic single crowns using three-dimensional computer models. A first analysis by electron scanning microscope of the marginal leakage in titanium framework on 12 extracted teeth showed a marginal accuracy of fit of 68.3 +/- 61.1 microns for the shoulder, and 95.7 +/- 83.2 microns for the chamfered preparation. Owing to limited indicative value of recordings by electron scanning microscopes, the crown edges of the 9 teeth with shoulder preparations were subjected to histological-morphometric measurements. Using this more accurate investigational system, a distinctly higher arithmetic mean of 89.2 +/- 69.1 microns for the marginal accuracy of fit was achieved. It also enabled the marginal leakage of cement (96.5 +/- 85.1 microns), the marginal adaptation (37.4 +/- 93.3 microns) and the shoulder formation (44.4 +/- 58.9 microns) to be judged.

Computer Simulation↗
PubMed1989

[Bonding strength of metal frameworks and adhesive agents in the resin-bonded bridge technic. 3. Comparative research on various retention mechanisms and adhesive systems].

In fixed denture prosthetics, macro- and micromechanical as well as chemical adhesive mechanisms may be used between metal and bonding agent. The in vitro research presented here determines the adhesive strength of six different bonding agents and five different retention mechanisms on twelve precious and nonprecious metal alloys using shearing stress. The evaluation of the results should help to assess the suitability of the various combinations of materials and anchoring methods for the fixation of adhesive bridges. On the basis of the adhesive strengths and the examination of the various clinical advantages and disadvantages of the different methods that were analyzed, the electrolytic etching of nonprecious metal alloys appears to be particularly suitable for fixed denture prostheses. An efficient combination between alloy and bonding agent is of particular importance in this area. Macromechanical mesh and negative retentions can only be used to a limited clinical extent due to their high space requirements. Very good results were produced by the preconditioning of inner anchor surfaces with silanes. Sandblasting, however, provided unsatisfactory shear-stress results over a broad front independently of the type of alloy.

Dental Alloys↗