title: Evaluation and Comparison of Changes in Microhardness of Primary and Permanent Enamel on Exposure to Acidic Center-filled Chewing Gum: An in vitro Study.
abstract: OBJECTIVE
  The study is to evaluate changes in microhardness of enamel after exposure to acidic center filled chewing gum on primary and permanent teeth.
  
  
  METHODS
  Thirty primary and 30 permanent molar extracted teeth were painted with acid resistant varnish except a small window over buccal surface. Teeth were divided into four groups according to type of teeth and type of chewing gum (Center fresh and Bubbaloo) (D1, P1, D2 and P2); each tooth was exposed to whole chewing gum mashed with 5 ml of artificial saliva for five minutes at room temperature twice a day for 5 days. After the exposure, teeth were stored in deionized water and submitted for microhardness tests.
  
  
  RESULTS
  Paired t-test and independent sample t-test were used for statistical analysis. A significant reduction in microhardness was found between exposed and unexposed areas in all groups. There was no statistically significant difference in reduction of microhardness to chewing gums, and between primary and permanent enamel.
  
  
  CONCLUSIONS
  There is a definite reduction in microhardness in all groups exposed to chewing gums. Both the chewing gums are equally erosive; both permanent and primary teeth were affected. How to cite this article: Mudumba VL, Muppa R, Srinivas NCH, Kumar DM. Evaluation and Comparison of Changes in Microhardness of Primary and Permanent Enamel on Exposure to Acidic Center-filled Chewing Gum: An in vitro Study. Int J Clin Pediatr Dent 2014;7(1):24-29.
authors.affiliation: Senior Lecturer, Department of Pedodontics and Preventive Dentistry Narayana Dental College and Hospital, Nellore, Andhra, Pradesh India.
authors.forename: Vijaya Lakshmi
authors.initials: VL
authors.lastname: Mudumba
authors.affiliation: Head, Department of Pedodontics, Panineeya Dental College Hyderabad, Andhra Pradesh, India.
authors.forename: Radhika
authors.initials: R
authors.lastname: Muppa
authors.affiliation: Reader, Department of Pedodontics, Panineeya Dental College Hyderabad, Andhra Pradesh, India.
authors.forename: Nch
authors.initials: N
authors.lastname: Srinivas
authors.affiliation: Reader, Department of Pedodontics, Panineeya Dental College Hyderabad, Andhra Pradesh, India.
authors.forename: Duddu Mahesh
authors.initials: DM
authors.lastname: Kumar
keywords: Chewing gum; Dental erosion; Microhardness