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All Journal Dentino: Jurnal Kedokteran Gigi
Delvi Fitriani
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Dentistry

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THE EFFICACY OF GREEN TEA (Camellia sinensis) LEAVES EXTRACT AS CORROSION INHIBITOR FOR ORTHODONTICS STAINLESS-STEEL WIRE (Research report) Neny Roeswahjuni; Delvi Fitriani; Annisa Dwi Wardanianti
Dentino : Jurnal Kedokteran Gigi Vol 4, No 1 (2019)
Publisher : FKG Unlam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/dentino.v4i1.6187

Abstract

Background: Stainless-steel orthodontic wire is one of appliance component frequently used in orthodontics treatment and persisted in oral cavity for an extended period, thus may generate corrosion via ion release. An attempt to reduce corrosion rate is by using organic inhibitor which contains antioxidant. This substance can be simply found in green tea leaves. Objective: To discover the efficacy of green tea leaves as a corrosion inhibitor for stainless-steel orthodontic wire. Methods: It is an experimental laboratory research with post-test only control group design. As many as 24 samples were divided into 4 groups which immersed in artificial saliva: one group without any treatment and 3 groups given green tea leaves extract, each in 6.25%, 12.5% and 25% concentration. Corrosion rate was measured using potentiodynamic methods (Tafel). Data was analyzed using one way ANOVA test followed by post-hoc tukey HSD test. Result: There was significant difference in corrosion inhibitory efficacy among treatment groups (p<0.05). The highest corrosion rate value was found in no-treatment group (average value 0.195). The highest corrosion rate reduction was found in treatment group number four supplemented with 25% concentration of green tea leaves extract as inhibitory substance (p=0.0325). Conclusion: Green tea leaves extract is proven to be effective as corrosion inhibitor for stainless-steel orthodontic wire.
DIFFERENCE IN SETTING TIME AND WORKING TIME INTERVAL OF CONVENTIONAL ZINC PHOSPHATE CEMENT AND NANOPARTICLE ZINC PHOSPHATE CEMENT (Research report) Chandra Sari Kurniawati; Delvi Fitriani; Sheila Ananda Putri
Dentino : Jurnal Kedokteran Gigi Vol 4, No 1 (2019)
Publisher : FKG Unlam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/dentino.v4i1.6185

Abstract

Introduction: Zinc phosphate cement is one of cavity base material frequently used for pulp protection in the field of dentistry. This material demonstrates superiority in mechanical resilience and manipulation simplicity yet inducing pulp irritation as the reflection of high level acidity. Utilizing nano-particle ZPC may vanquish the shortcoming in conventional mechanical properties. However, brief setting time in nano-particle ZPC will generate higher exothermic reaction accompanied by the shortening of working period. Purpose: To assess the difference in setting time and working time interval of conventional ZPC and nano-particle ZPC. Methods: It is a true experimental laboratory study with post-test control group design. Four treatment groups were presented in five respective repetitions, comprising one scoop (0.318 gr) of conventional ZPC with three drops liquid in Group I, one scoop (0.386 gr) of nano-particle ZPC with four drops liquid in Group II, one scoop (0.386 gr) of nano-particle ZPC with three drops liquid in Group III, and one scoop (0.386 gr) of nano-particle ZPC with two drops liquid in group IV. ZPC was then manipulated in circular motion from powder to liquid. The setting time and working time was determined using stopwatch in second unit which then statistically analyzed using one-way ANOVA and post hoc Tukey HSD test. Result: Nano-particle ZPC with two drops liquid (Group IV) exhibited the shortest setting time value (mean 96.60s) which unveiled concurrently with the briefest working time interval (mean 34s). The longest setting time was presented in conventional ZPC (Group I) in the average of 627.80 seconds which also depicted the lengthiest working period with 84.20 seconds average. Statistical analysis revealed significant disparity in setting time value of conventional ZPC and nano-particle ZPC in each treatment group (p<0.05) while no significant difference was identified in working time data analysis (p>0.05). Conclusion: There is a significant difference in setting time and working time interval of conventional ZPC and nano-particle ZPC.
Co-Authors Annisa Dwi Wardanianti Chandra Sari Kurniawati Neny Roeswahjuni Sheila Ananda Putri