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Mechanical properties of calcium phosphate based dental filling and regeneration materials
Author(s) -
Lee Y.K.,
Lim B.S.,
Kim C.W.
Publication year - 2003
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2003.01061.x
Subject(s) - ultimate tensile strength , materials science , carboxymethyl cellulose , acrylic resin , universal testing machine , compressive strength , composite material , citric acid , distilled water , polymer , nuclear chemistry , chemistry , sodium , chromatography , coating , metallurgy , organic chemistry
summary The objective of this study was to compare the mechanical properties of calcium phosphate cements (CPC) for possible dental applications with varied liquid and powder compositions under the same testing condition. Cements studied in this experiment were divided into two groups of CPC not containing polymer and polymeric CPC (PCPC). Cement powder was formed by combining equimolar amounts of dicalcium phosphate anhydrous and tetracalcium phosphate, or acrylic resin polymer powder mixture. The CPC specimens for the compressive strength (CS) and diametral tensile strength (DTS) measurements were prepared by mixing powder and liquid for 30 s with a powder/liquid ratio of 3:1, and subsequently packing the paste into a brass mould. The specimens were kept at 37 °C and 100% relative humidity for 24 h before measurements were conducted on a Universal Testing Machine with a cross‐head speed of 1 mm min –1 . The CS of CPC was 0ḃ14–10ḃ29 MPa and that of PCPC was 0ḃ26–117ḃ58 MPa. The DTS of CPC was 0ḃ10–4ḃ56 MPa and that of PCPC was 0ḃ07–22ḃ54 MPa. The CS and DTS were very diverse depending on the composition of powder and liquid. Some compositions showed higher values than commercial liners. Thus compositions of 2% carboxymethyl cellulose + 35% citric acid in phosphate buffered saline (PBS), 20% gelatin in PBS, 2% sodium alginate in PBS, 20–40% aqueous acrylic‐maleic copolymer solution, and some of the HPMC and PMVE‐Ma solutions exhibited promising formulae for dentine regenerating materials. Acrylic resin‐PCPC group showed generally higher CS and DTS values. Based on this study, further studies on the reaction with odontoblast and resultant dentine regeneration should be performed using promising compositions.