J Korean Acad Prosthodont.  2015 Oct;53(4):301-309. 10.4047/jkap.2015.53.4.301.

Clinical evaluation of retained preload and cement washout in screw- and cement-retained implant prosthesis

• Chung CH
• Son MK
• Kim SG

• KMID: 2118801
• DOI: http://doi.org/10.4047/jkap.2015.53.4.301

Abstract

PURPOSE
The aim of this study was to evaluate the clinical performance of screw- and cement-retained implant prosthesis (SCP) design in terms of retained preload of abutment screws and cement washout.
MATERIALS AND METHODS
Patients with the partial posterior edentulous areas comprised the study group. Implants were placed, and SCPs were delivered after 3 to 6 months healing. Follow-up examinations were performed. The implant survival rate and the prosthetic success rate were evaluated. The retained preload ratio of abutment screws and the prosthetic decementation ratio were measured.
RESULTS
Twenty one SCPs (forty three implants)in twenty patients were followed up to 64 months. All of the implants survived during the follow-up period (mean follow-up: 34 months). The prosthetic success rate was 100 % considering no abutment, screw, porcelain or metal frame fractures, as well as no screw loosening. The retained preload ratio of SCPs at the end of follow-up period was 97.61% (+/-16.29) and the decementation ratio was 9.5 %.
CONCLUSION
Within the limitations of this clinical study, SCP design showed favorable short-term clinical performances in respect of screw loosening and cement washout.

Keyword

Dental prosthesis design; Dental cements; Implant-supported dental prosthesis

MeSH Terms

Dental Cements
Dental Porcelain
Dental Prosthesis Design
Dental Prosthesis, Implant-Supported
Follow-Up Studies
Humans
Prostheses and Implants*
Survival Rate
Dental Cements
Dental Porcelain

Figure

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  Fig. 1. Mini Digital Torque Wrench; (A) four customized screwdrivers (hex size/length; 1.25 mm/19 mm, 1.25 mm/13 mm, 1.2 mm/19 mm, 1.2 mm/13 mm), (B) modified connector of torque wrench.

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  Fig. 2. Periapical radiographic view of 2-unit SCP on #36-37 area (#36-screw type unit, #37-cement type unit); (A) initial view, (B) postoperative view (38 months after delivery).

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