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Biomedical subjects

G J Chiche

Publications and source records attributed to G J Chiche.

26 records · Page 2Linked to original sources
PubMed1985

Laminated single impression technique for cast posts and cores.

A laminated single impression technique for cast post and core has been described. Its advantages are the ease and versatility with prefabricated or customized post techniques (Fig. 14) and the one-step registration of single or multiple divergent canals. Its disadvantage is the necessity for additional laboratory procedures.

Crowns↗
PubMedDate not supplied

Considerations for fabrication of implant-supported posterior restorations.

Implant-supported posterior restorations must be fabricated following established prosthodontic principles. The need for screw-retained abutments and the narrow diameter of root-form implants dictate additional treatment protocols that fall beyond the scope of conventional prosthodontics. Cemented restorations offer simplicity and good control of morphology, but can only be considered if removal or no reservicing of the restoration is anticipated. Screw-retained restorations allow for reservicing or remediation but necessitate centering of the retaining screw within the occlusal anatomy. When the implant is misaligned, axis problems are solved with preangled copings, custom copings, or double frameworks. The diameter of root-form implants is significantly smaller than posterior natural teeth, and the emergence of the restorations must be progressively flared to achieve proper morphology. Limited interocclusal space and implant placement may dictate restoring posterior teeth as premolars, selecting a short abutment or a nonsegmented ("UCLA") abutment, or overlapping the crowns over the soft tissues. The final abutment selection is best assisted with a diagnostic waxing and with provisional restorations anticipating the completed treatment.

Bicuspid↗
PubMedDate not supplied

Adapting fixed prosthodontics principles to screw-retained restorations.

Implant restorations may be visualized clinically using a provisional fixed partial denture and in the laboratory with a fully contoured waxing on the master cast. The benefits of eggshell restorations for provisional restorations are as valid in implant prostheses as in conventional restorations. A technique is presented using the plastic laboratory sleeves to provide reliable anchorage as well as protection and preservation of the abutments. A fully contoured waxing on the master cast predictably determines the most appropriate design for screw-retained restorations. When unfavorable implant placement would create compromised morphology, a retrievable auxiliary substructure is indicated.

Dental Abutments↗
PubMedDate not supplied

Auxiliary substructure for screw-retained prostheses.

A double framework system is indicated when implant location could result in an overcontoured or compromised metal ceramic prosthesis. Precise design of the auxiliary substructure should provide for all necessary reorientations and corrections before constructing the metal ceramic framework. The additional cost and complexity of this technique must be weighed against the esthetic and morphologic requirements of the patient.

Adult↗