O Yoldaş1, C Doğan, G Seydaoğlu. 1. Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, University of Cukurova, Adana, Turkey. oguzyoldas@cu.edu.tr
Abstract
AIM: To evaluate the effect of a calcium hydroxide and glycerine mix and a calcium hydroxide and water mix on the microhardness of human root dentine. METHODOLOGY: Eleven freshly extracted maxillary canine and central incisor teeth were used. The teeth were sectioned transversally to produce a total of 22 dentine discs from the middle-third of the root. The specimens were divided into two groups of 11 discs each. Dentine samples were treated with either a Ca(OH)2-glycerine combination or a Ca(OH)2-distilled water combination for 1, 3 and 7 days. Dentine microhardness was measured with a Knoop indenter with a load of 100 g for 15 s before and during the experimental period. Each root disc received a series of three indentations around the pulp space, 1 mm from canal wall. RESULTS: Statistical analysis showed that both combinations significantly decreased dentine microhardness after 3 and 7 days (P < 0.01). The reduction in dentine microhardness following the use of a Ca(OH)2-glycerine combination was significantly greater than that after a Ca(OH)2-distilled water combination after 3 and 7 days (P < 0.01). CONCLUSION: The use of Ca(OH)2 combinations for intracanal dressing softens dentine.
AIM: To evaluate the effect of a calcium hydroxide and glycerine mix and a calcium hydroxide and water mix on the microhardness of human root dentine. METHODOLOGY: Eleven freshly extracted maxillary canine and central incisor teeth were used. The teeth were sectioned transversally to produce a total of 22 dentine discs from the middle-third of the root. The specimens were divided into two groups of 11 discs each. Dentine samples were treated with either a Ca(OH)2-glycerine combination or a Ca(OH)2-distilled water combination for 1, 3 and 7 days. Dentine microhardness was measured with a Knoop indenter with a load of 100 g for 15 s before and during the experimental period. Each root disc received a series of three indentations around the pulp space, 1 mm from canal wall. RESULTS: Statistical analysis showed that both combinations significantly decreased dentine microhardness after 3 and 7 days (P < 0.01). The reduction in dentine microhardness following the use of a Ca(OH)2-glycerine combination was significantly greater than that after a Ca(OH)2-distilled water combination after 3 and 7 days (P < 0.01). CONCLUSION: The use of Ca(OH)2 combinations for intracanal dressing softens dentine.
Authors: Ghaeth H Yassen; Tien-Min G Chu; Maxime A Gallant; Matthew R Allen; Mychel M Vail; Peter E Murray; Jeffrey A Platt Journal: Clin Oral Investig Date: 2013-10-08 Impact factor: 3.573