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The aim of the study is to find the rotary instrument usage and preferred brand of rotary instrument among endodontists working in dental colleges, Chennai. A rotary instrument is used to remove or reduce tooth matter and to shape teeth during endodontic procedure. Rotary instrument includes burs and endodontic files. Various brands of rotary instruments are currently available in the market which includes dentsply protaper, Mtwo, endostar, k3 XF files, Heroshaper etc. The choice of rotary instrument by a dentist is governed by various factors like their efficiency, ductility, sharpness, cross section and flexibility. An online questionnaire based study was conducted among 97 endodontists working in dental colleges in Chennai. A total of 10 questions consisting of both open ended and close ended questions related to usage, preferred brand and properties were included in the questionnaire . Datas were collected from the filled questionnaire and analysed. Descriptive statistics was used. From the study it was reported that 88% of endodontists use rotary instruments for endodontic procedures in their clinical practice. The most preferred brand of rotary instrument used by endodontists is Mtwo (40%) because of its good cutting ability and shaping followed by 20% k3, 18% protaper, 6% heroshaper and 36% combination of different rotary instruments. Majority of the endodontists preferred using rotary instruments and nearly half of them opt to use mtwo file in their clinical practice.

Tobacco use has a major public health concern that results in significant morbidity and mortality. Tobacco use has an injurious effect on oral health such as oral cancer and potentially malignant disorders like , oral fibrosis. Tobacco use has been found to have a strong, chronic and dose dependent effect on periodontal tissues due to poor oral hygiene caused by increased deposit of debris and calculus among tobacco users. This study aimed to find the association between oral hygiene status and tobacco dependence. A retrospective study was conducted using the case records of patients in University hospital. Data on tobacco dependence and oral hygiene status from 150 patient records were collected and for association. Descriptive statistics and chi-square association was done. The mean age of patients in the records was 35 ± 12.44 years and males (14%) had severe tobacco dependence. The mean Oral Hygiene Index Simplified (OHIS) score was found to be 2.03 ± 1.009 which is interpreted as fair. There was no statistically significant association between oral hygiene status and tobacco dependence (p= 0.157). Tobacco dependence has no role in the oral hygiene status of an individual.

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