Influence of surface treatment and cyclic loading on the durability of repaired all-ceramic crowns

Abstract

ObjectiveThis study investigated the durability of repaired all-ceramic crowns after cyclic loading.Material and methodsEighty In-ceram zirconia crowns were fabricated to restore prepared maxillary premolars. Resin cement was used for cementation of crowns. Palatal cusps were removed to simulate fracture of veneering porcelain and divided into 4 groups (n = 20). Fracture site was treated before repair as follows: roughening with diamond bur, (DB); air abrasion using 50 µm Al2O3, (AA) and silica coating using Cojet system followed by silane application, (SC). Control group (CG) 20 specimens were left without fracture. Palatal cusps were repaired using composite resin. Specimens were stored in water bath at 37°C for one week. Ten specimens of each group were subjected to cyclic loading. Fracture load (N) was recorded for each specimen using a universal testing machine. Two-way analysis of variance (ANOVA) and Tukey honestly significant difference (HSD) test (α=.05) were used for statistical analysis.ResultsThere was statistically significant difference between control and tested groups, (p<0.001). Post Hoc analysis with the Tukey HSD test showed that cyclic loading fatigue significantly decreased means fracture load of control and test groups as follows (CG, 950.4±62.6 / 872.3±87.4, P = 0.0004), (DB, 624.2 ±38 / 425.5± 31.7, P <.001), (AA, 711.5 ±15.5 / 490 ± 25.2, p <0.001) and (SC, 788.7 ± 18.1 / 610.2 ± 25.2, P <.001), while silica coating and silane application significantly increased fracture load of repaired crowns (p<0.05).ConclusionRepair of fractured Inceram zirconia crowns after chairside treatment of the fracture site by silica coating and silane application could improve longevity of repaired In-ceram zirconia crowns.

Surface treatments for repair of feldspathic, leucite- and lithium disilicate-reinforced glass ceramics using composite resin

“…However, it is important to highlight that those studies did not use the ageing process for the bonded interface, as the thermocycling used in this study, which may have caused the interface degradation. As regards the success of other surface treatments (groups GHF and GDB) used in this study to repair feldspathic ceramics, they are in agreement with other studies (7,8,11).…”

“…Bonding components are also required for the adhesion to restorative material. Traditionally, surface treatment for ceramics involves roughening with diamond burs (7)(8)(9), etching with hydrofluoric acid (8,(10)(11)(12) or tribochemical process based on silica-coated aluminumoxide particles (11)(12)(13)(14)(15)(16)(17). For restorative material bonding, use of silane is recommended for glasses and porcelains in order to obtain a mesh of siloxane with the silica on the ceramic surface, to improve the bond strength between the ceramic and luting material and to increase the surface energy for adhesive application (18).…”

Effects of Surface Treatments, Thermocycling, and Cyclic Loading on the Bond Strength of a Resin Cement Bonded to a Lithium Disilicate Glass Ceramic

“…7,8,22 It has been shown that this treatment has an efficient result for other kinds of dental ceramics. 3,7,8,12,[19][20]23 The lowest mean tensile bond strength was obtained for the specimens that were air abraded with 50-lm Al 2 O 3 . The present results indicate that this treatment does not provide a mechanically retentive surface that is as efficient as etching with HF.…”

Farklı yüzey işlemlerinin zirkonyanın ağız içi tamirine etkisi

“…Son yıllarda, zirkonya yüzeyinin çeşitli yüzey işlemlerine tabi tutularak kompozit rezinler ile ağız içi tamiri gündeme gelmiştir. 13,16 Bu yüzey işlemleri, hidroflorik asit uygulaması, 17 yüzeyin silanlanması, silika kaplama, 13 kumlama, aşındırma, fosfat bağlı monomer içeren rezin uygulaması, SIE (selective infiltration etching), 18 ve bazı kombine yüzey işlemi uygulamaları, 19,20 Nd:YAG ve Er:YAG lazer uygulamaları 13,21 olarak sayılabilir. Hidroflorik asit ile yüzey pürüzlendirilmesi camsı seramikler ve feldspatik seramiklerde önerilebilen bir metot olmasına rağmen, yüzeyin camsı yapıda olmaması ve silikadan yoksun olması zirkonya yüzeyinin hidroflorik asit uygulamasına karşı dirençli kılmaktadır.…”