Clinical evaluation of jacket crowns made of the Estenia indirect composite

Hideaki Shiono, DDS, PhD,(a,b) Hiroyasu Koizumi, DDS, PhD,(b,c) Mika Nemoto, DDS, PhD,(b,c) Yumi Ishikawa, DDS,(b) Hideo Matsumura, DDS, PhD,(b,c) and Naomi Tanoue, DDS, PhD(d)

(a)Private Practice, Saitama, (b)Department of Crown and Bridge Prosthodontics, Nihon University School of Dentistry, Tokyo, (c)Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry, Tokyo, and (d)Department of Specialized Dentistry, Nagasaki University Hospital of Medicine and Dentistry, Nagasaki, Japan

Purpose: The purpose of the present study was to evaluate the clinical performance of jacket crowns made of a highly loaded indirect composite material.
Materials and Methods: A total of 25 jacket crowns made of the Estenia composite were seated with resin-based luting agent, and thereafter clinically evaluated using modified USPHS criteria. Color match, marginal integrity, surface texture, wear of both restoration and antagonist, recurrent dental caries, fracture or detachment, and gingivitis around the abutments were examined. The observation period varied from 16 to 83 months with an average of 38.9 months.
Results: All crowns were judged as Alfa for all categories at baseline. After an average observation period of 38.9 months, the following number of cases were judged as Bravo; one for color match, nine for surface texture, one for wear, five for wear of the silver-palladium alloy antagonists, and two for gingival inflammation. Wear of enamel antagonists, however, was not remarkable. Deterioration of marginal integrity, recurrent dental caries, and fracture of crown were not observed in any patients.
Conclusion: It can be concluded that the Estenia composite is clinically applicable for use as jacket crowns. (Int Chin J Dent 2005; 5: 17-21.)
Clinical Significance: Clinical evaluation demonstrated that jacket crowns made of the Estenia composite can function satisfactorily for more than three years.
Key Words: clinical evaluation, composite, jacket crown.