The effect of magnesium oxide supplementation to aluminum oxide slip on the jointing of aluminum oxide bars.
The purpose of this study was to investigate the effect of modifying aluminum oxide slips with magnesium oxide (MgO) to create a jointing material for In-Ceram Alumina. Jointed In-Ceram Alumina bars with In-Ceram Alumina slips containing 0-1.0 mass% MgO were examined by a three-point bending test. Joint-free bars were also tested as controls. Fracture surfaces were evaluated by scanning electron microscopy. In addition, linear shrinkage and fracture toughness were assessed. The 0.3 mass% MgO group showed the highest flexural strength among the jointed groups, and there were no statistical differences between the joint-free control groups. The fracture surface of 0.3 mass% MgO group showed increased sintering densification with reduced micropore size. No linear shrinkage was observed with the addition of MgO to the alumina slip. Added MgO was also effective in boosting fracture toughness. The present findings indicate that the MgO-supplemented binding material is useful for clinical applications.
Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan.
Tetsurou
T
Odatsu
Takashi
T
Sawase
Kohji
K
Kamada
Yohsuke
Y
Taira
Takanobu
T
Shiraishi
Mitsuru
M
Atsuta
D000537:Aluminum Oxide / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D006244:Hardness; D006358:Hot Temperature; D008277:Magnesium Oxide; D008422:Materials Testing; D008669:Metallurgy; D018583:Pliability
D003776:Dental Porcelain; D008277:Magnesium Oxide; D000537:Aluminum Oxide