[New control technic for tooth mobility]. / Nouvelle technique de contrôle de la mobilité dentaire.

The method described, used to establish tooth mobility, is a refinement of the method of Mühlemann, 30 years old. The improvements include a larger sensitivity of the chain of measures, a better stabilizatiin of the intraoral fixatioin of the instruement, the utilization of a retainer on the tooth to be tested, which ensures the precision of the point of forcetesting. This point remains the same for all measurements. Finally, the recording of the test on paper allows for an objective comparison of the course of the case.

Evaluation of alternative alloys to precious ceramic alloys. 1. Mechanical properties.

In the first part of this study, the microstructures and the mechanical properties of precious, semi-precious, and nonprecious dental casting alloys for the porcelain-baked-to-metal technique have been determined. The semi-precious alloys contained only 50% gold, and palladium, silver, and some base metals. The nonprecious alloys were of the nickel-chromium type. Discs and miniaturized tensile bars have been cast and tested either in the as cast condition, or after a simulation of the various porcelain bakes. Proof stress, ultimate tensile strength, elongation, and plastic stiffness have been measured and results compared by use of analyses of variance. The microstructure examination shows that the simulation of the porcelain bakes improves the homogeneity of the precious and semi-precious alloys. Simultaneously, the mechanical properties of the same alloys are also improved. One semi-precious alloy, still under development at the time of these tests, has its mechanical characteristics markedly downgraded by the thermal treatments. The nickel-chromium alloys exhibit the best range of mechanical properties for the porcelain-baked-to-metal technique, when considering the three most relevant properties: proof stress, plastic stiffness, and modulus of elasticity.

[Removable partial denture. Excerpts from the literature 1977--1979]. / Prothèse partielle adjointe. Extraits de la littérature 1977--1979.

In partial denture prosthesis research and advances were made principally on: -- the fundamental biomechanical properties of the demodont and the fibromucosa. In the light of these findings, the justification of stressbreaking as a principle is questioned -- the mechanical properties of chromium-cobalt alloys -- checking of castings by radiography -- simplification of the designs for removable partial denture frameworks -- impression materials and techniques (fluid-wax functional impression and altered cast-procedure) -- the combination of restauration and plaque control for successful dentistry.

[Movements of the supporting teeth in Kennedy-Applegate class III and IV restorations]. / Etude sur les mouvements des dents piliers dans les restaurations des classes III et IV de Kennedy-Applegate.

Two types of restoration of the class III and two types of the class VI have been tested on a test bench. These restorations react differently to vertical forces than to oblique ones. The fixed bridge reacts best to vertical forces. On the other hand it is the bilateral prosthesis with four Akers clasps which is more favorable to oblique forces. The enclosed saddles function, in this case, as a brake. When the global results (vertical and oblique forces) of induced movements are compared for the two types of class-III restoration (four Akers clasps or two Dolder bars) the differences are insignificant.

[Principles and indications for prosthetic restorations]. / Principes et indications des restaurations prothétiques.

Once it has been explained and defined what a prosthesis and what the masticatory apparatus and its function are, the author defines the three principles of a prosthetic restauration: --Any prosthetic restauration should be conceived and realized only after a complete study of the odontostomatognathic system. --Any prosthetic restauration must reestablish the health of the masticatory apparatus. --Any prosthetic restauration must assist in the conservation of the remaining teeth. Six corollaries are deduced from those principles and are equally defined and analysed. The indication of a prosthetic restauration comes from those principles and their corollaries. A possible fixed restauration is to be studied first, then comes the possibility of a semifixed construction. When both those solutions are impossible, the planning of a removable prosthesis, even simple, must be studied with method. This prosthesis must be composed of a cast metallic framework. If the planned prosthetic restauration can not be beneficial to the whole masticatory apparatus, it is better to renounce to do it.

[Comparative study of 3 irreversible hydrocolloids]. / Etude comparative de 3 hydrocolloïdes irréversibles.

This study was realized: to determine the best manipulation of 3 alginates; to compare their dimensional stability; to compare their reproduction of detail; to evaluate, through these 3 criteria, the best of the 3 alginates. It seems necessary to point out that: The 3 examined alginates show a poor dimensional stability on account of the deformations produced during the setting time and the removal of the impression. The immediate pouring of the model gives the best results, because storing the impression is accompanied by dimensional changes. The other methods of conservation seem considerably less accurate. The reproduction of detail is excellent with the 3 alginates. The accuracy is of 25 micrometer, but it is not possible to take advantage of this quality, because the compatibility and the accuracy of model stone are insufficiently adapted to the properties of the alginates. CA-37 is, among the 3 studied alginates, the one which gave the worst results with regard to the ease of manipulation and compatibility with Vel Mix Stone.