effect of two triphala formulations on resin–dentin bond strength and durability

Objective: this study aimed to evaluate the effect of two 0.2% triphala (phyllanthus emblica: terminalia chebula: terminalia bellirica) formulations: a standard 1:1:1 ratio and a modified 1:2:1 ratio with increased terminalia chebula content, on immediate and six-month-aged microtensile bond strength (µtbs) of a composite resin.methods: twelve extracted caries-free molars were randomly assigned to three groups (n=4), based on the dentin pre-treatment applied after acid-etching: group 1: control (no pre-treatment), group 2: 0.2% triphala 1:1:1, and group 3: 0.2% triphala 1:2:1. after applying the bonding agent, the teeth were restored with composite resin. each tooth was sectioned to obtain multiple resin-dentin beams (1×1 mm), among which 24 were selected per group. in each group, 12 beams were tested after 24 hours, and 12 after 6 months of water storage at 37°c. µtbs was measured using a universal testing machine. data were analyzed using anova and independent t-tests (α = 0.05).results: the control group exhibited a significant reduction in µtbs after 6 months (11.20±4.35 to 6.75±3.48 mpa; p=0.005). the triphala-treated groups did not show a significant reduction in µtbs over time, with group 2 decreasing from 10.94±4.47 to 9.54±3.50 mpa (p=0.344) and group 3 from 11.06±5.95 to 10.50±8.35 mpa (p=0.866). intergroup differences in bond strength were not significant at any time point (p>0.05).conclusions: dentin pre-treatment with 0.2% triphala preserved µtbs over six months, suggesting potential mmp-inhibitory activity. increasing the proportion of terminalia chebula in the triphala formulation from 1:1:1 to 1:2:1 did not provide additional benefits concerning bond durability.