Evaluation and Comparison of the Effect of Different Surface Preparations on Bond Strength of Glass Ionomer Cement with Nickel–Chrome Metal–Ceramic Alloy: A Laboratory Study

Abstract

Retention of fixed partial dentures is mostly dependent upon the bond between metal and cement as well as cement and tooth structure. However, most of the time clinical failure of bond has been observed at metal and cement interface. The treatment of metal surface, prior to luting, plays a crucial role in bonding cement with the metal. This study is conducted to evaluate and compare the effect of different surface preparations on the bond strength of resin-modified glass ionomer cement with nickel-chromium metal ceramic alloy. Fifty caries-free extracted molar teeth were made flat until the dentin of the occlusal surface was exposed. After fabrication of the wax patterns and subsequent castings, the castings were subjected to porcelain firing cycles. The nickel-chromium metal ceramic alloy discs were also divided into five groups and subjected to various surface treatments: (1) Unsandblasted (U), (2) sandblasted (S), (3) sandblasted and treated with 10% aqueous solution of KMnO4 (SK), (4) unsandblasted and roughened with diamond abrasive points (UD) and (5) unsandblasted and roughened with diamond abrasive points and treated with 10% aqueous solution of KMnO(4) (UDK). After surface treatments, the castings were cemented using Fuji PLUS encapsulated resin-modified glass ionomer cement. The obtained values of all the groups were subjected to statistical analysis for Tensile and Shear bond strength. Different surface treatments of the metal affects the bond strength values of resin-modified glass ionomer cement when used as luting agent.

Tensile strength of Ni-Cr copings subjected to inner surface sandblasting using different cementing agents: Anin vitrostudy

“…The retention of a fixed prosthesis is very important for clinical success and, thus, it is necessary, among other requirements, to evaluate the qualities of a cementing agent [68] and of inner surface treatments for copings due to their ability to facilitate the mechanical retention of the cement [3][4][5][6][7][8]. In this context, tensile strength tests are often used, based on the load required for the removal of crowns during the movement of traction.…”

“…Various surface treatments are available for enhancing cement retention; these aim to increase the strength and/or mechanical imbrication between the inner surface of the crown and the cement [3,4]. This study evaluated the influence of sandblasting with 100-and 320-mesh aluminum oxide particles on retention and it was found that the use of such aluminum oxide particles (100-or 320-mesh) resulted in the same retention efficiency (p > 0.05) in all cases studied (before and after thermal cycling).…”

“…In some clinical procedures, crowns with metal sub-structures are used to replace tooth crowns previously destroyed by pathological or physiological processes or injury. Thus, researchers have studied different ways to increase the retentiveness of these indirect restorations [2][3][4][5][6].…”

“…The inner surface texture of the copings is also an important factor in the retention of fixed partial dentures [3,4,8]. However, studies evaluating the influence of the size of aluminum oxide particles on the tensile strength of metal copings are uncommon in the literature.…”

“…Assuming that the retention of indirect restorations can also be influenced by the cementing agent [11,18] and the inner surface roughness of the copings [3,4], this study aimed to evaluate the tensile strength of Ni-Cr copings cemented with different cements (zinc phosphate and conventional and resin-modified glass ionomer), combined with an inner surface treatment of the metal copings with aluminum oxide at different granulations (100-and 320-mesh), before and after thermal cycling.…”