ABSTRACT
The aims of this study were (1) to assess the amount of fluoride (F) released from varnishes containing calcium glycerophosphate (CaGP) and (2) to assess the effect of the experimental varnishes on in vitrodemineralization. Six test groups using 5 varnishes: base varnish (no active ingredients); Duraphat® (2.26% NaF); Duofluorid® (5.63% NaF/CaF2); experimental varnish 1 (1% CaGP/5.63% NaF/CaF2); experimental varnish 2 (5% CaGP/5.63% NaF/CaF2); and no varnish were set up. In stage 1, 60 acrylic blocks were randomly distributed into 6 groups (n = 10). Then 300 µg of each varnish was applied to each block. The blocks were immersed in deionized water, which was changed after 1, 8, 12, 24, 48 and 72 hours. Fluoride concentration in the water was analyzed using a fluoride electrode. In stage 2, 60 bovine enamel samples were distributed into 6 groups (n = 10), and treated with 300 µg of the respective varnish. After 6 h the varnish was removed and the samples were subjected to a 7-day in vitro pH cycle (6 h demineralization/18 h remineralization per day). The demineralization was measured using surface hardness. The results showed that both experimental varnishes released more fluoride than Duofluorid® and Duraphat® (p < 0.05), but Duraphat® showed the best preventive effect by decreasing enamel hardness loss (p < 0.05). Therefore, we conclude that even though (1) the experimental varnishes containing CaGP released greater amounts of F, (2) they did not increase in the preventive effect against enamel demineralization.
Subject(s)
Animals , Cattle , Cariostatic Agents/chemistry , Dental Enamel/drug effects , Fluorides, Topical/chemistry , Glycerophosphates/chemistry , Sodium Fluoride/chemistry , Tooth Demineralization/prevention & control , Dental Caries/prevention & control , Hardness Tests , Materials Testing , Random Allocation , Reference Values , Reproducibility of Results , Surface Properties , Time Factors , Water/chemistryABSTRACT
A avulsão dentária acomete principalmente pacientes jovens e que possuem dentes com rizogênese incompleta, sendo frequente a necrose pulpar e a apicificação que é prejudicada. O amplo forame dificulta a inserção de curativos de demora. Assim é importante o uso de um curativo de demora a favorecer o controle da reabsorção radicular e a formação de uma barreira de tecido mineralizado permitindo o selamento apical. O hidróxido de cálcio tem sido o material mais utilizado para esse fim. O objetivo deste trabalho foi estudar o processo de reparo de incisivos de ratos com elementos dentais reimplantados tardiamente após a obturação do canal radicular com pasta de β-glicerofosfato de cálcio ou pasta de hidróxido de cálcio. Foram empregados 30 ratos machos divididos em 3 grupos de 10 animais. Os elementos dentais foram extraídos e mantidos em meio seco por 60 minutos. Após esse período os elementos dentais sofreram um preparo especifico descrito a seguir. No Grupo I os dentes foram preenchidos com soro fisiológico. No Grupo II, utilizou-se a pasta de hidróxido de cálcio no interior do conduto e plug apical de cimento MTA. E, no grupo III utilizou-se a pasta de β-glicerofosfato de cálcio. Os dentes foram reimplantados e a eutanásia dos animais foi realizada 60 dias após para a avaliação histomorfométrica em H.E (Hematoxicilina-Eosina). Os resultados demonstraram que os grupos I e III foram mais comprometidos pela reabsorção radicular inflamatória do que o grupo II. O grupo II apresentou menor comprometimento pela reabsorção total do que o grupo II (p<0,05). Nos grupos I e III a região periapical apresentou a maior extensão de tecido conjuntivo fibroso com a presença de infiltrado inflamatório. Conclui-se que o β-glicerofosfato de cálcio não foi mais eficiente do que o hidróxido de cálcio no controle da reabsorção radicular e no reparo da região periapical por tecido mineralizado
Thooth avulsion mainly affects young patients who have incomplete root formation, with frequent necrotic pulp and apexification impaired. The large foramen hinders the insertion of dressings delay. The use of a long time fill to facilitate control of formation and resorption of mineralized tissue barrier permitting the apical seal. Calcium hydroxide and MTA has been the most widely used material for this purpose. The objective of this work is to study the repair process of rat incisors with dental elements reimplanted late after root canal filling with paste β-glycerophosphate calcium or calcium hydroxide paste. Were used 30 male rats were divided into 3 groups of 10 animals. All the teeth were extracted and kept in dry for 60 minutes. In Group I, the root canals were filled with saline. Group II used the paste of calcium hydroxide and finished with a MTA plug and Group III were used β-glycerophosphate calcium paste. The teeth were reimplanted and euthanasia was performed 60 days later for histomorfometric analyse with HE(Hematoxiciline-Eosine). Results showed that the groups I and III were more impaired by inflammatory root resorption than group II. Group II had less involvement by total reabsorption of the group II (p <0,05). In groups I and III, the periapical region showed the greatest extent of fibrous connective tissue with inflammatory infiltrate. It is concluded that β-glycerophosphate calcium were less effective than calcium hydroxide in the control of root resorption and repair of the periapical area of mineralized tissue
Subject(s)
Animals , Rats , Calcium Hydroxide , Glycerophosphates , Tooth Avulsion , Tooth Replantation , Tooth ResorptionABSTRACT
A avulsão dentária acomete principalmente pacientes jovens e que possuem dentes com rizogênese incompleta, sendo frequente a necrose pulpar e a apicificação que é prejudicada. O amplo forame dificulta a inserção de curativos de demora. Assim é importante o uso de um curativo de demora a favorecer o controle da reabsorção radicular e a formação de uma barreira de tecido mineralizado permitindo o selamento apical. O hidróxido de cálcio tem sido o material mais utilizado para esse fim. O objetivo deste trabalho foi estudar o processo de reparo de incisivos de ratos com elementos dentais reimplantados tardiamente após a obturação do canal radicular com pasta de β-glicerofosfato de cálcio ou pasta de hidróxido de cálcio. Foram empregados 30 ratos machos divididos em 3 grupos de 10 animais. Os elementos dentais foram extraídos e mantidos em meio seco por 60 minutos. Após esse período os elementos dentais sofreram um preparo especifico descrito a seguir. No Grupo I os dentes foram preenchidos com soro fisiológico. No Grupo II, utilizou-se a pasta de hidróxido de cálcio no interior do conduto e plug apical de cimento MTA. E, no grupo III utilizou-se a pasta de β-glicerofosfato de cálcio. Os dentes foram reimplantados e a eutanásia dos animais foi realizada 60 dias após para a avaliação histomorfométrica em H.E (Hematoxicilina-Eosina). Os resultados demonstraram que os grupos I e III foram mais comprometidos pela reabsorção radicular inflamatória do que o grupo II. O grupo II apresentou menor comprometimento pela reabsorção total do que o grupo II (p<0,05). Nos grupos I e III a região periapical apresentou a maior extensão de tecido conjuntivo fibroso com a presença de infiltrado inflamatório. Conclui-se que o β-glicerofosfato de cálcio não foi mais eficiente do que o hidróxido de cálcio no controle da reabsorção radicular e no reparo da região periapical por tecido mineralizado...
Thooth avulsion mainly affects young patients who have incomplete root formation, with frequent necrotic pulp and apexification impaired. The large foramen hinders the insertion of dressings delay. The use of a long time fill to facilitate control of formation and resorption of mineralized tissue barrier permitting the apical seal. Calcium hydroxide and MTA has been the most widely used material for this purpose. The objective of this work is to study the repair process of rat incisors with dental elements reimplanted late after root canal filling with paste β-glycerophosphate calcium or calcium hydroxide paste. Were used 30 male rats were divided into 3 groups of 10 animals. All the teeth were extracted and kept in dry for 60 minutes. In Group I, the root canals were filled with saline. Group II used the paste of calcium hydroxide and finished with a MTA plug and Group III were used β-glycerophosphate calcium paste. The teeth were reimplanted and euthanasia was performed 60 days later for histomorfometric analyse with HE(Hematoxiciline-Eosine). Results showed that the groups I and III were more impaired by inflammatory root resorption than group II. Group II had less involvement by total reabsorption of the group II (p <0,05). In groups I and III, the periapical region showed the greatest extent of fibrous connective tissue with inflammatory infiltrate. It is concluded that β-glycerophosphate calcium were less effective than calcium hydroxide in the control of root resorption and repair of the periapical area of mineralized tissue...
Subject(s)
Animals , Rats , Calcium Hydroxide , Glycerophosphates , Tooth Avulsion , Tooth Replantation , Tooth ResorptionABSTRACT
Objective To investigate calcification of cultured aortic medial cells in vitro and acceleration by 25 hydroxycholesterol or ? glycerophosphate. Methods Aortic medial cells were obtained by explantation, and the calcification was observed by von Kossa staining. Insoluble calcium precipitation in cellular layer was determined by biochemical method , and osteocalcin in the media was analyzed with radioimmunoassay. Results Two different types of primary cells were shown from culture: one with parallel cellular growth and being negative by von Kossa staining, the other cell type formed cellular nodules with positive von Kossa staining. After 28 days of cell passages, cell growth appeared no nodule formation. However, many cellular nodules and positive von Kossa staining were observed in the passaged cells treated with 25 hydroxycholesterol or ? glycerophosphate, and both insoluble calcium 〔(57 80?18 50)?g/pool, (67 50?15 30)?g/pool〕and osteocalcin 〔(0 886?0 063)?g/L, (0 895?0 061)?g/L〕in the medium were significantly increased than that of the untreated cells. Conclusions Cultured aortic medial cells could be divided into two subtypes, one with the characters of smooth muscle cells, the other with the micro vascular pericytes which could calcify the extracellular matrix. 25 hydroxycholesterol and ? glycerophosphate promoted the in vitro calcification, and osteocalcin secretion was increased in the process of calcification of aortic medial, suggesting that osteocalcin might participate in the aortic calcification.