![]() ![]() ![]() The maximum shear stress of the cement layer and maximum principal stress of the roots and their distributions were investigated. Vibration loads were applied near the neck on the buccal side of the core at frequencies of 10 to 40 kHz and amplitudes of 10 to 50 μm. Two post‐core materials (Au and Ni‐Cr alloys), two cements (glass ionomer (GI) and zinc phosphate (ZP), and two cement layer thicknesses (50 μm and 150 μm) were considered. To analyze the effect of post‐core material, and cement material and thickness on the stress in post‐core systems under ultrasonic vibration at different frequencies and amplitudes using three‐dimensional finite element analysis.Įight three‐dimensional finite element models of a maxillary central incisor with post‐cores were established. ![]() From this study it can be concluded that PEG inhibit Ca(OH) 2 setting reaction up to 7 days and might be used as solvent for Ca(OH) 2 paste as intracanal medicament. PEG is a hygroscopic high viscosity solvent, resulting in low and steady molecule interaction, thus prolonged its setting time. The result of this study showed that the setting time of Ca(OH) 2 paste mixed with Na CMC solvent was 1:04 hours, PG 72:15 hours, and PEG did not harden until 7 days of observation. Results were analyzed by One Way Anova test and Post Hoc Tukey test. Setting time evaluation was measured according to ISO 9917 by vicat needle in 37☌ to mimic the physiological body condition. ![]() This study consists of 5 groups (n=5) commercially Ca(OH) 2 paste (Calcipex II) as positive control, Ca(OH) 2 powder (Merck) + distilled water as negative control, limestone Ca(OH) 2 powder + natrium carboxy methylcellulose (Na CMC) as group 1, limestone Ca(OH) 2 powder + propylene glycol (PG) as group 2, and limestone Ca(OH) 2 powder + polyethylene glycol (PEG) as group 3. The aim of this study is to synthesize Ca(OH) 2 powder from Indonesian limestone, and evaluate the setting time of Ca(OH) 2 paste from mixture of Ca(OH) 2 powder synthesized from Indonesian limestone (limestone Ca(OH) 2 ) with various solvent, to evaluate which solvent serve best to prevent the Ca(OH) 2 paste from setting, to form an ideal paste be used as an intracanal medicament. Solvent is an important factor affecting ion dissociation and preserving its non-setting paste condition. To form an injectable paste, Ca(OH) 2 powder has to be mixed with a proper solvent to produce optimal consistency, ion dissociation, and maintain its property as a non-set material. Ca(OH) 2 is applied into the infected root canal in a non-setting paste form to release calcium and hydroxyl ions which elevates the pH and provide an antimicrobial effect to pathogenic bacteria. Calcium hydroxide (Ca(OH) 2 has been recently synthesized from natural Indonesian limestone to be used as an intracanal medicament for root canal infection. ![]()
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