Effect of mint extract on the ion release from orthodontic wires

Aim: The high incidence of nickel (Ni) allergy and the increasing use of Ni‑containing and  Cr-containing  dental  biomaterials  have been  of  growing  concern. The purpose of this  investigation was  to  analyse  and  evaluate  the  rate  of  Ni  and  Cr  ion  release  from different types arch wires used in orthodontics , when immersed in Mint extract. Materials and Methods:  Two groups of arch wires (nickel-titanium  [NiTi],  SS)  were  stored  in  Mint extract  and  tested  at different  intervals  i.e.,  1  hour,  6  hour,  12  hour,  24  hour  and  1  week.  The  ions  released  from  the  sample  (Ni  and  Cr  ions)  were evaluated using an atomic adsorption spectrophotometer. Results :Ion release was insignificant in the solutions compared to the control solution Conclusions: It can be concluded from our study that the amount of metal ions released was minimal in Mint extract and it can be safely used as a routine mouthwash in Orthodontic patients

Acetal Resin - A quantum leap in aesthetic restorative dentistry : A Review

Changes in dental patient’s attitudes and awareness have been apparent in all aspects of dentistry, especially aesthetics. This has increased the demand for not just improved functional care, but aesthetically functional care. In removable partial denture fabrication, unsightly facial clasps have always been a cosmetic problem with traditional options, either expensive or technically difficult. This article describes the advent of a new material as an alternative for anterior retention that maintains excellent aesthetics

Does Mint have Antifungal and Antibacterial effect: An invitro study

Introduction: Patients undergoing fixed appliance treatment have many attachments on their teeth that act as an active site as plague retention sites for the attachment of food particles and subsequently microorganisms which later cause caries and periodontal diseases Orthodontic patients have an increase in the microorganisms because of the active sites for the plaque accumulation. Almost all conventional mouth freshners contain alcohol and fluoride, which are toxic (even lethal) if used in large amounts. This is often not the case with natural herbal mouth rinses. Mouth rinse comes into direct contact together with your mucosa and may be absorbed directly into your bloodstream. Mint which is a perennial plant has antimicrobial property and can be used as a mouth wash for these patients. Aim: To evaluate the efficacy of aqueous extracts of Mint on Candida albicans and Streptococcus mutans by evaluating their zone of inhibition. Methodology: Cell suspension with 108 cells were prepared using candida albicans and Streptococcus mutans. Using sterile micro tip, wells were made which was about 8mm in diameter. Lawn culture was made on appropriate media

Alginate impressions: A practical perspective

The choice of an impression material for a particular situation depends on the treatment being provided, operator preference, and so on. Even with the introduction of more advanced and more accurate rubber base impression materials, irreversible hydrocolloid impression materials have stood the test of time. This article gives a detailed perspective of how best to make alginate impressions

Comparison of the dimensional accuracy and surface detail reproduction of different impression materials under dry and moist conditions - An Invitro study.

AIMS AND OBJECTIVES The purpose of this study was to compare the ability of different impression materials to record surface detail under dry and moist conditions and to also compare the accuracy of gypsum casts obtained from these impression materials.   METHODS Impressions were made of stainless steel dies as described in ANSI/ADA Specification No.19, with two vertical and three horizontal lines inscribed on the die superior surface. Impressions were made under dry and moist conditions. Impressions were poured with Type IV die stone. Dimensional accuracy was measured by comparing the average length of the middle horizontal line in each impression and each gypsum cast with the same line on the metal die using a measuring microscope. Surface detail reproduction was evaluated: continuous replication of at least two of the three horizontal lines.   RESULTS The percent change of Polyether, Polyvinylsiloxane, Irreversible Hydrocolloid impression materials under dry condition were +0.05, -0.14, -0.27 and under moist condition were +0.04, -0,15, -0.27 respectively. The percent change of Polyether, Polyvinylsiloxane and Irreversible Hydrocolloid poured gypsum samples under dry condition were +0.06, -0.13, -0.26 and under moist condition were +0.06, -0.13, -0.26 respectively.   CONCLUSIONS Within the limitations of the study, the following conclusions were drawn: 1.      Moisture did not cause a significant adverse effect on the dimensional accuracy of the three impression materials. 2.      There was no statistically significant difference in dimensional accuracy or surface detail reproduction among the gypsum casts produced from the three different impression materials when compared between dry and moist conditions. &nbsp

Dimensional Stability and Retention Strength of Impressions to Custom Impression Trays Fabricated Using Conventional Method and Additive Technology - An In-vitro Study

Background: 3D printing technology is replacing manual fabrication in all fields. 3D-printed impression trays should be assessed as they could replace conventional impression trays in the future. Aim: In-vitro comparison and evaluation of the dimensional stability and retention strength of impressions to custom impression trays fabricated using conventional method and additive technology. Materials and Methods: A maxillary edentulous auto-polymerizing acrylic resin model served as the master model. Two moulds were prepared from the master model in order to obtain 12 casts. One cast was scanned for 3D printing digital light processing (DLP) and fused deposition modelling (FDM) 24 impression trays using polylactic acid (PLA). Twelve casts were used to fabricate light cure impression trays. Polyvinyl-siloxane impressions were made on the master model using 36 impression trays and 18 trays each were used to assess dimensional stability and retention strength. Results: In dimensional stability analysis, one sample t-test revealed a statistically significant difference between each group and the master model followed by a one-way ANOVA. There were significant differences, but the difference was less with FDM trays (P < 0.05). In retention strength analysis, one-way Analysis of variance (ANOVA) revealed statistically significant difference between each group and post-hoc test revealed specific difference, the highest with FDM trays (P < 0.05). Conclusion: Dimensional changes were observed at 30 minutes and 72 hours. Lesser dimensional changes were observed when impressions were made using FDM trays followed by DLP and light cure trays. The mean retention strength seen in descending order was FDM, followed by DLP and light cure trays. The best retention strength was noticed when impressions were made using FDM trays

A study on the incorporation of radiofrequency identification strips in implant and tooth supported over dentures for treatment information and denture identification

Aim: To find the efficacy of radiofrequency identification (RFID) strips in reading patient treatment details and as a tool for patient identification. Materials and Methods: The initial part of the study was done in in-vitro dentures and later in in-vivo conditions in patient dentures. In-vitro testing was done by incorporating RFID strips in 10 nonclinical dentures and the ability of the RFID reader to accurately read the information was checked. In the second part of the study, 35 implant-supported overdenture patients were chosen and RFID strips were incorporated in their dentures after feeding the data. The accuracy of the RFID reader to read the patient details and treatment information was checked after processing and after a period of 6 months. Results: The in-vitro results revealed 100% accurate reading of the details by the RFID reader. In the clinical study, 35 out of 35 patient details were readable after processing. Conclusion: RFID can be an effective tool in denture identification and in revealing the patient's previous treatment history, prosthesis type, implant brand, dimensions, and material used which will be very useful in implant therapy