OBJECTIVES: The aim of this study was to compare the maximum loads and modes of failure of four glass ionomer luting cements during post pull-out tests. METHODS: The cements studied included two based on conventional glass ionomer cement chemistry, i.e., a hand-mixed cement and an encapsulated cement, and two based on the newer light-cured chemistry, i.e., a restorative cement used at a low powder:liquid ratio and an experimental luting cement. One hundred and forty bovine incisors were cut 13 mm from the apex and prepared with post channels, 1.75 mm in diameter and 9 mm long. Ni-Cr-Mb bonding alloy posts were cast and sandblasted prior to cementation into the roots with each of the cements. Twenty-four hours later, pull-out tests were carried out at a strain rate of 0.5 mm/min. The maximum loads and modes of failure were noted. The data obtained were analyzed using a Kruskal-Wallis test followed by comparison of groups using Mann-Whitney tests. RESULTS: Comparison of the maximum loads revealed a significant difference between the conventional encapsulated cement and all other cements. Weibull analysis of the results gave values for the Weibull moduli and probabilities of survival for a post under a given load for each cement and indicated that the newer cements performed better than the conventional cements. SIGNIFICANCE: Further research into the in vitro and in vivo behavior of the resin-modified glass ionomer cements in clinical situations where light-curing is not possible is justified.
OBJECTIVES: The aim of this study was to compare the maximum loads and modes of failure of four glass ionomer luting cements during post pull-out tests. METHODS: The cements studied included two based on conventional glass ionomer cement chemistry, i.e., a hand-mixed cement and an encapsulated cement, and two based on the newer light-cured chemistry, i.e., a restorative cement used at a low powder:liquid ratio and an experimental luting cement. One hundred and forty bovine incisors were cut 13 mm from the apex and prepared with post channels, 1.75 mm in diameter and 9 mm long. Ni-Cr-Mb bonding alloy posts were cast and sandblasted prior to cementation into the roots with each of the cements. Twenty-four hours later, pull-out tests were carried out at a strain rate of 0.5 mm/min. The maximum loads and modes of failure were noted. The data obtained were analyzed using a Kruskal-Wallis test followed by comparison of groups using Mann-Whitney tests. RESULTS: Comparison of the maximum loads revealed a significant difference between the conventional encapsulated cement and all other cements. Weibull analysis of the results gave values for the Weibull moduli and probabilities of survival for a post under a given load for each cement and indicated that the newer cements performed better than the conventional cements. SIGNIFICANCE: Further research into the in vitro and in vivo behavior of the resin-modified glass ionomer cements in clinical situations where light-curing is not possible is justified.
Authors: Syed Rashid Habib; Abdul Sadekh Ansari; Aleshba Saba Khan; Nawaf M Alamro; Meshari A Alzaaqi; Yazeed A Alkhunefer; Abdulaziz A AlHelal; Talal M Alnassar; Abdulaziz S Alqahtani Journal: Materials (Basel) Date: 2022-09-30 Impact factor: 3.748
Authors: Mariana Benedetti Ferreira Webber; Silvia Masae de Araújo Michida; Fabiano Carlos Marson; Giovani Corrêa de Oliveira; Cleverson de Oliveira E Silva Journal: J Int Oral Health Date: 2015-04