title: Erosive potential of cola and orange fruit juice on tooth colored restorative materials.
abstract: BACKGROUND
  Erosion is a common condition which manifests due to consumption of high caloric and low pH acidic food stuffs such as carbonated drinks and fruit juices which cause irreversible damage to dental hard tissues and early deterioration of the dental restorations.
  
  
  OBJECTIVE
  The main aim of this study is to evaluate and to compare the erosive potential of carbonated drink (cola) and fruit juice (orange fruit juice) by measuring the surface roughness (Ra) values on two commonly used dental restorative materials.
  
  
  METHODS
  A total of 36 specimens each were prepared using both testing materials, compomer (Group I) and giomer (Group II). Six specimens in each group were discarded due to wide variation in pre exposed Ra values and the remaining 30 specimens in each group were further sub divided into 10 samples each according to the testing media used. Immersion regime was followed according to Von Fraunhofer and Rogers. The pre and post immersion surface roughness values were recorded using a profilometer.
  
  
  RESULTS
  Both tested materials showed statistically-significant surface erosion (P < 0.01) when exposed to cola and orange fruit juice than the control group (water).
  
  
  CONCLUSIONS
  Compomer showed more surface roughness when compared to giomer when exposed to the three tested media which can be attributed to the variation in filler content, decomposition of resin matrix and fallout of the fillers in composites when exposed to acidic drinks. Other factors responsible for this significant erosion were also discussed.
  
  
  CONCLUSIONS
  Significant surface changes of the dental restorative materials can take place when exposed to low pH drinks for a prolonged period.
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Sibar Institute of Dental Sciences, Guntur, India.
authors.forename: K
authors.initials: K
authors.lastname: Rajavardhan
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Sibar Institute of Dental Sciences, Guntur, India.
authors.forename: Ajs
authors.initials: A
authors.lastname: Sankar
authors.affiliation: Department of Pedodontics and Preventive Dentistry, S. V. S. Dental College, Mehaboobnagar, India.
authors.forename: Mgm
authors.initials: M
authors.lastname: Kumar
authors.affiliation: Department of Pedodontics and Preventive Dentistry, St. Joseph's Dental College, Eluru, Andhra Pradesh, India.
authors.forename: Kr
authors.initials: K
authors.lastname: Kumar
authors.affiliation: Department of Pedodontics and Preventive Dentistry, Sibar Institute of Dental Sciences, Guntur, India.
authors.forename: K
authors.initials: K
authors.lastname: Pranitha
authors.affiliation: Department of Prosthodontics, Sibar Institute of Dental Sciences, Guntur, India.
authors.forename: Kk
authors.initials: K
authors.lastname: Kishore
keywords: Compomer; Erosion; Giomer; Orange fruit juice; Profilometer; Soft drink; Surface roughness