Development of self-setting Te-Cp/alpha-TCP cement for pulpotomy

Current dental capping agents like calcium hydroxide are known to produce highly alkaline environments. This can lead to tissue irritation over time. Prior research has shown that calcium hydroxide increases pH to near 12 in simulated body fluids, which may not be ideal for long-term pulp preservation. No prior work had resolved how to balance sustained mild alkalinity with biocompatibility. That uncertainty drove the exploration of alternative cements. Researchers needed a material that could adjust pH without extreme values. They also sought a one-step method to avoid complex processing. This gap motivated the investigation of tetracalcium phosphate and alpha-tricalcium phosphate combinations. The goal was to develop a cement that could form apatite in simulated body fluids.

The study aimed to develop a new self-setting cement for pulpotomy using tetracium phosphate and alpha-tricalcium phosphate. The goal was to create a material that could adjust its alkalinity through molar ratios. The researchers wanted to avoid the high pH levels seen with calcium hydroxide. They also sought a one-step heating method to simplify production. The cement needed to form carbonate-containing apatite in simulated body fluids. This would mimic the natural environment of dental pulp tissue. The team wanted to ensure the cement remained stable for at least one month. Their ultimate goal was to provide a mildly alkaline environment for pulp healing.

The researchers mixed tetracalcium phosphate and alpha-tricalcium phosphate in different molar ratios. They used a one-step heating process to prepare the cement. The cement was mixed with a 1 mol/L sodium dihydrogen phosphate solution. This solution helped the cement set and form apatite. The mixture was tested in revised simulated body fluid (R-SBF). The R-SBF mimicked the chemical conditions of dental pulp tissue fluid. The pH of the solution was measured over time. The team compared the results to those obtained with calcium hydroxide.

The cement formed carbonate-containing apatite in R-SBF within a month. The pH of the solution remained below 8.0 even after prolonged storage. In contrast, calcium hydroxide raised the pH to nearly 12.0 on the first day. This high pH persisted until the end of the experiment. The Te-CP/alpha-TCP cement provided a stable, mildly alkaline environment. The cement’s pH never exceeded that of calcium hydroxide. The one-step method simplified the production process. The results suggest the cement could be suitable for pulpotomy procedures.

The study demonstrated that Te-CP/alpha-TCP cement could adjust its alkalinity through molar ratios. The cement formed apatite in simulated body fluid without exceeding pH 8.0. This is significantly lower than the pH produced by calcium hydroxide. The one-step heating method proved effective for cement preparation. The cement remained stable for at least one month in R-SBF. These findings suggest the cement could offer a safer alternative to calcium hydroxide. The mildly alkaline environment may be better for pulp healing. The authors propose that this cement could be suitable for clinical pulpotomy applications.