1346 Surface Effects of Soft Drinks to Composites

Saturday, March 24, 2012: 9:45 a.m. - 11 a.m.
Presentation Type: Poster Session
J. SOTO, Restorative Sciences, Universidad de Costa Rica, San Jose, Costa Rica, and D. LAFUENTE, Dept. of Dental Materials, University of Costa Rica, San Pedro, Costa Rica

Objectives: to evaluate the effect of carbonated soft drinks over the surface of composite resins.

Methods: Thirty composite disks, 2mm thick and 10 mm in diameter were fabricated of each of four composite resins: Filtek Supreme XT (3M ESPE), Filtek LS (3M ESPE), Grandio (VOCO GmbH) and TPH3 (Dentsply). Specimens were divided into six groups (n=5) to be soaked in four carbonated soft drinks and one in water as control. The remaining group was used for SEM observations. Soft drinks used were Coca-Cola regular¨, Coca Cola Zero¨, Squirt¨ and Gasified Grape Tropical¨. Specimens were immersed in the soft during for 30 minutes per day, then removed from the drink and placed in water. Vickers hardness (VHN) was recorded at baseline, and after 15, 30 and 60 days of treatment. Data was recorded in VHN and analyzed using a repeated measurement ANOVA calculated at 0.05 significance level. Tukey-Kramer test for differences among groups was also calculated at 0.05.

Results: VHN at baseline and after 60 days are shown intable. Hardness for all composites evaluated decreased after being 60 days. All soft drinks used in this study produced the same decreasing effect on all composites. SEM observation showed an increment in the number and size of defects on the surface after the 60 days treatment.

Coke

 

Coke Zero

Squirt 

Grape

 

water

BL

60d

BL

60d

BL

60d

BL

60d

BL

60d

 

Z350

75

71

76

73

70

67

77

73

75

76

 

P90

52

45

55

50

51

49

52

46

53

49

 

TPH3

60

56

57

55

62

61

64

57

61

60

 

Grandio

91

83

90

89

97

90

89

85

88

84

 

Conclusion: As little as 30 minutes of contact time per day, carbonated soft drinks produce a negative effect on the surface of composite resins evaluated.


Keywords: Composites, Dental materials and Hardness