evaluation of the effect of axial wall modification and coping design on the retention of cement-retained implant-supported crowns

نویسندگان

reza derafshi assistant professor, department of prosthodontics .faculty of dentistry .shiraz university of medical science.shiraz. iran

ahmad hasan ahangari associate professor. department of prosthodontics,faculty of dentistry,shiraz university of medical science,shiraz,iran

kianoosh torabi associate professor . biomaterial research center.faculty of dentistry,shiraz university of medical science,shiraz,iran

mitra farzin associate professor. department of prosthodontics,faculty of dentistry,shiraz university of medical science,shiraz,iran

چکیده

background and aims. because of compromised angulations of implants, the abutments are sometimes prepared. the purpose of this study was to investigate the effect of removing one wall of the implant abutment on the retention of cement-retained crowns. materials and methods. four prefabricated abutments were attached to analogues and embedded in acrylic resin blocks. the first abutment was left intact. axial walls were partially removed from the remaining abutments to produce abutments with three walls. the screw access channel for the first and second abutments were completely filled with composite resin. for the third and fourth abutments, only partial filling was done. wax-up models were made by cad/cam. ten cast copings were fabricated for each abutment. the copings of fourth abutment had an extension into the screw access channel. copings were cemented with temp bond. the castings were removed from the abutment using an instron machine, and the peak removal force was recorded. a one-way anova was used to test for a significant difference followed by the pairwise comparisons. results. the abutments with opened screw access channel had a significantly higher retention than the two other abutments. the abutment with removed wall and no engagement into the hole by the castings exhibited the highest retention. conclusion. preserving the opening of screw access channel significantly increases the retention where one of the axial walls of implant abutments for cement-retained restorations is removed during preparation.

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منابع مشابه

Evaluation of the Effect of Axial Wall Modification and Coping Design on the Retention of Cement-retained Implant-supported Crowns

Background and aims. Because of compromised angulations of implants, the abutments are sometimes prepared. The purpose of this study was to investigate the effect of removing one wall of the implant abutment on the retention of cement-retained crowns. Materials and methods. Four prefabricated abutments were attached to analogues and embedded in acrylic resin blocks. The first abutment was left ...

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Effect of Circumferential and Axial Grooves on the Retention of Provisionally Cement-Retained Implant-Supported Crowns

Introduction: Retention of provisionallycemented implant-supported restorations plays an important role in success of the treatment. Uncemented restorations may cause several problems such as restoration swallowing, increased bone loss and prosthesis failure. Therefore, suitable cement compromising between retention and retrievability as well as extra-means of abutment retention might be prefer...

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Effect of Abutment Modification and Cement Type on Retention of Cement-Retained Implant Supported Crowns

OBJECTIVE Provisional cements are commonly used to facilitate retrievability of cement-retained fixed implant restorations; but compromised abutment preparation may affect the retention of implant-retained crowns.The purpose of this study was to investigate the effect of abutment design and type of luting agent on the retentive strength of cement-retained implant restorations. MATERIALS AND M...

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effect of abutment modification and cement type on retention of cement-retained implant supported crowns.

provisional cements are commonly used to facilitate retrievability of cement-retained fixed implant restorations; but compromised abutment preparation may affect the retention of implant-retained crowns.the purpose of this study was to investigate the effect of abutment design and type of luting agent on the retentive strength of cement-retained implant restorations.two prefabricated abutments ...

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عنوان ژورنال:
journal of dental research, dental clinics, dental prospects

جلد ۹، شماره ۱، صفحات ۳۵-۳۹

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