Gingival compound resin and feldspar ceramic: shear strength of different adhesion systems and surface treatment

The influence of aesthetics on the various dentistry specialties is increasingly more relevant. Areas that historically have focused on treatments to restore oral health are currently driven to seek solutions to aesthetic interventions. Also, different specialties have sought to interact with the aim of achieving better aesthetic outcomes. Currently, the relationship between prosthesis and periodontics overcomes the need of rehabilitation and maintenance of periodontal health. The restoration procedures are significantly hindered in situations such as loss of soft and bone tissue that cause the appearance of defects, mainly in the anterior region, when surgical interventions are not possible. In these cases, dentogingival prosthetic restoration is a viable alternative for the aesthetic and functional restoring.1,2 Current ceramics used in dentogingival prostheses are known to be aesthetically fit since they simulate the natural color of teeth and have adequate physical properties. However, the ceramics that simulate gingival color offer a less than optimal result. The alternative choice, with a better pink aesthetic, is the gingival color compound resin. This material, however, raises questions regarding bond strength with porcelain infrastructures.3−5 The concept of adhesion has changed the dental practice, placing adhesive dentistry in constant evolution. New and improved products are constantly being introduced to the market, motivating research to unveil and compare behaviors under different conditions. However, mechanical, chemical and mechanicalchemical methods are still designed to promote an adequate irregular surface and optimize mechanical retention of the resin. The ceramic surface can be treated with acids,6,7 or with diamond-tipped burs and blasting.8,9 Given this context, the aim of this study is to analyze the bond strength between feldspar ceramic Creation (Willi Geller International GmbH, Meiningen Austria) and the gingival compound resin Amaris Gingiva (Voco, GmbH, Cuxhaven, Germany) using shear strength testing and thermal cycling. The analysis will consider two adhesive bond agents: 3M ESPE Adper Single Bond Plus and 3M ESPE Adper Scotchbond Multi-Purpose Plus with or without surface treatment (blasting with aluminum oxide of 50μm).