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Biomedical subjects

P Khayat

Publications and source records attributed to P Khayat.

6 recordsLinked to original sources
PubMed1994

The use of osseointegrated implants in the maxillary tuberosity.

Because of the reduced amount of bone often found in the posterior maxilla, osseointegrated implants are rarely used distally to the first molar region. In order to provide adequate posterior support for a fixed bridge or a removable prosthesis and to avoid the potential problems related to cantilevers, a specific technique of placement is employed. This paper describes and evaluates a study on the clinical outcome of 65 osseointegrated implants using this technique, placed in 51 patients, with a maximum observation time of 4 years, in which the absolute success rate was 95%. Short-term results support the use of osseointegrated implants in the maxillary tuberosity. The learning objective of this article is to present this technique to a larger segment of the dental profession.

Dental Implantation, Endosseous↗
PubMed1990

[Pre-implant esthetic study].

The first dental prostheses used on Branemark implants were aesthetically disappointing both for the dentists and their patients. Therefore the authors will consider the various aesthetic problems encountered when treating loss of teeth with implant systems. The problems related to resorption are numerous: large bone losses are resolved by adapting removable acrylic, carrying out bone transplants immediately fixed by the implants, using filling materials, or complete dentures fixed with attachments supported by the implants. Periodontal surgery often provides a solution to the problem of gum visibility at the level of the maxillary anterior teeth. The problems related to the site where implants emerge can often be avoided by consultation between the surgeon and the prosthodontist and by flexing a surgical guide compiled from a pre-prosthetic analysis of the clinical situation. The aesthetic problems related to the actual implant systems are dependent on three factors: When the prosthesis is directly screwed onto the implant, the axis of the implant determines the axis of the dental prosthesis and can lead to the emergence of the screw on the buccal surface; With angulated cores, orientated screws provide the required solution. The implant material, when metallic leads to an unsightly border at the gingival level. Ceramic implants, or the "ceraming" of titanium, provide a solution to this problem. In case of diastema the use of an implant system gives the best choice in comparison to the more conventional treatments. In conclusion, the authors point out the importance of pre-implant analysis which must give an evaluation of the aesthetic result. The fragility of the aesthetic evaluation should encourage dentists to obtain the "clear and written consent" of their patients, accepting the risks run by treatment of this kind.

Dental Implantation, Endosseous↗
PubMed1990

[Panorama of prosthetic options in osseointegrated implantology].

Today, several prosthetic options can be used with osseointegrated implants. Fixed bridges may be retained by screws or cemented. Detachable bridges may be screwed on cylindrical, conical, straight or angulated abutments. In certain cases, they will be placed directly in contact with the implants. Cemented bridges may be placed over screwed, cemented or transfixed copings. They also may be cemented over transfixed metallic structures already splinting the implants. Removable prosthesis may be stabilized with bars, stud attachments or magnets. All these different options are discussed, and their advantages and disadvantages presented.

Dental Implantation, Endosseous↗
PubMedDate not supplied

Single tooth replacement using a one-piece screw-retained restoration.

This article reviews and illustrates several options available with single tooth implant prostheses. For use with internal hex implants, the authors prefer one-piece screw-retained restorations due to their easy retrievability, absence of cement, and remarkable aesthetics. The treatment procedure is outlined from presurgical prosthetic planning and surgery to the placement of the final prosthesis. The advantages and disadvantages of the technique are reviewed. The use of wide or narrow screw access channels is discussed. Selection of torque instruments and the proper levels of torque when tightening the screws are evaluated. Three clinical cases are presented to illustrate the principles reviewed in the text. The learning objective of this article is to provide up-to-date information on an implant system for screw-retained single tooth restorations.

Adolescent↗