Compatibility of Novel Gingival Retraction Pastes Based on Boswellia papyrifera with Polyvinyl Siloxane Impression Material (A Comparative in-vitro Study)
This in-vitro study aimed to evaluate the compatibility of both conventional gingival retraction pastes based on Aluminium chloride (AlCl3), and novel gingival retraction pastes based on herbal astringent (Boswellia papyrifera (Bp) with and without AlCl3) with polyvinyl siloxane impression material by measuring the setting time polymerization index. The test of the Compatibility with Light body type III polyvinylsiloxane impression material (Variotime light body type III, KULZER, Germany) was carried out by measuring the standard-setting time of polyvinylsiloxane impression material to obtain ultimate compatibility time polymerization index (100%) for the control group and compared it with the compatibility time polymerization index of the impression after mixing with the studied gingival retraction pastes at oral temperature (35 ±0.1) ?, rotational speed 0.5 rpm, and spindle size (0.7) using Brookfield HBDVII+ viscometer (USA). The total samples were thirty-two, eight for each group: Control group: polyvinylsiloxane impression without mixing with gingival retraction paste), Group 1: Novel gingival retraction paste (5% Bp+7.5% AlCl3) mixed with polyvinylsiloxane impression material, Group 2: Novel gingival retraction paste (5% Bp) mixed polyvinylsiloxane impression material, Group 3: Conventional gingival retraction paste (Astringent Retraction Paste, 3M ESPE, Germany) mixed with polyvinylsiloxane impression material. Statistical analysis was performed using non-parametric tests by SPSS software (IBM SPSS statistics version 25, IBM Corp., Chicago, USA), including the Kruskal Wallis H test (KWH) and Mann-Whitney U multiple comparisons test (MWU). This test revealed that the highest compatibility time polymerization index was seen in group 2. In contrast, the lowest compatibility time polymerization index was seen group 3 with significant differences, and there were no significant differences between group 1 and group 2. This study concluded that both novel gingival retraction pastes were higher Compatibility with polyvinylsiloxane impression material than the conventional gingival retraction pastes based on 15% AlCl3.