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P Delcroix

Publications and source records attributed to P Delcroix.

11 recordsLinked to original sources
PubMed1991

[Surface properties of resins used for removable dentures].

The comparative study of the gingival aspect of dentures made from different flasking procedures, using scanning electronic microscopy, permits the differences in the surface texture of the resins to be assessed. This surface texture will show specific aspects for each technique. The Futurajet resin presents a surface texture with cracks of 100 microns to 200 microns long and 5 microns wide. The appearance of the polymer pellets reveals a good cohesion amongst them. The Futuracryl 2000 resin has an overall surface like an orange peel, with a hills and valleys revealing a rather weak attack of the monomer on the polymer. The palatal surface of the SR-Ivocap resin shows pleats and perpendicular fractures. The surface of the buccal aspect of the ridge is relatively smooth. The Lucitone resin shows a surface with very few irregularities, in which the polymer pellets are well dissolved. In conclusion, no porosities are found on the surface of the various resins. We think that the chemical composition of the resin influences this surface texture and the flasking technique being able to disturb the surface of the resin.

Acrylic Resins↗
PubMed1990

[Influence of chemical composition and polymerization technic on the quality of removable denture resins].

With the new means of investigation, such as scan electron microscopy and gaseous phase chromatography combined with mass spectrometry, the authors have analyzed some of the variables involved in the preparation of resin bases for removable prostheses. Various polymerization methods were tested: --the pressed technique: standard and Acron MC systems; --the injection technique: SR-Ivocap and Unipress systems. They were thus able to demonstrate the effect of the chemical composition on the homogeneity of the microscopic surface structure of the resins. They also pointed out that some of the muffle systems induce visible strains on the macroscopic surface structure. Besides, they observed that the polymerization cycle does not modify the microscopic surface structure of the resin. In conclusion, they advocate the use of resins with a chemical composition fitted in systems inducing minimum tensions.

Acrylic Resins↗
PubMed1985

The role of computed tomography in the assessment and treatment of acetabular fractures.

The assessment of acetabular fractures by conventional radiology is difficult whilst essential to the planning of orthopaedic treatment. This report details the results of computed tomography (CT) in a study of acetabular fractures in 30 patients. Computed tomography was always superior to conventional radiology, particularly in the evaluation of lesions of the posterior acetabular margin. The standard classification of the fractures did not require modification but was reinforced by the three-dimensional visualisation of the lesions. The particular contribution of CT was in the assessment of associated lesions often not apparent on conventional views of the pelvis: these comprised sacroiliac lesions in 60% of cases, intra-articular loose bodies in 33% of cases and pelvic haematomas in 17% of cases. As a result of CT, treatment was changed in one third of cases. In addition to its role in indicating the need for surgical or orthopaedic treatment, CT sometimes permitted a better choice of surgical technique, especially in respect of sacroiliac lesions causing as yet unexplained sciatica.

Acetabulum↗