Brushing abrasion of the enamel surface after erosion / 华西口腔医学杂志

Objective A study was conducted to compare the effect of different enamel remineralization periods after erosion on the depth of brushing abrasion. Methods Ten volunteers were selected for a 4-day experiment. A total of 60 enamels were randomly assigned into six groups (A-F) and placed in intraoral palatal devices. On the first day, the palatal devices were placed in oral cavity (24 h) . On the following three days, brushing experiments were performed extraorally, two times per day. The specific experimental method of brushing follows these next steps. First, the group F specimens were covered with a film of wax, and then acid etched for 2 min. Subsequently, the film of wax was detached. The groups from A to D were brushed after remineralization at the following time intervals: group A, 0 min; group B, 20 min; group C, 40 min; group D, 60 min. Erosion and remineralization were performed on group E, but without brushing. Remineralization was performed on group F, but without acid etching and brushing. The depth of enamel abrasion was determined by a mechanical profilometer. The surface morphology of the enamel blocks was observed using a scanning electron microscope. Results 1) The depth of abrasion was different in varied enamel remineralization time after acid etching. The statistical significant differences between groups were as follows. 2) When the time of enamel remineralization after acid etching was short, the surface depression in the electron microscope was deep, and the surface morphology was rough. Conclusion Brushing immediately after acid etching would cause much serious abrasion to the enamel surface. Brushing after 60 min can effectively reduce the abrasion of acid etching enamel.

The effectiveness of Minqing Ao dental desensitizer in the treatment of early childhood caries / 实用口腔医学杂志

Objective:To evaluate the effectiveness of Minqing Ao dental desensitizer in the treatment of early childhood caries (ECC).Methods:41 0 teeth with ECC in 1 1 0 cases were divided into 3 groups.Minqing Ao dental desensitizer,fluoride toothpaste and ordinary toothpaste without fluoride were respectively used in group A,B and C.The laser fluorescence value(LFV)was meas-ured and compared before treatment,2,4,6 weeks and 6 months after treatment.Results:2 weeks after treatment,the LFV was not significantly changed in the 3 groups.4 weeks after treatment LFV in group A was decreased(P0.05).6 weeks after treatment LFV in group A and B was decreased(P<0.01 and P<0.05),there was significant difference be-tween each 2 groups(P<0.05).6 weeks and 6 months after treatment LFV in group A was lower than that in group B(P<0.01 ),and in group B was lower than that in group C(P<0.01 ).Conclusion:Minqing Ao is effective for treatment of early childhood caries.

The effects of fluoride toothpaste and fluoride varnish on enamel remineralization and acid resistance:An in vitro study / 实用口腔医学杂志

Objective:To investigate the ability of fluoride toothpaste and fluoride varnish on enamel remineralization and acid resist-ance.Methods:Enamel specimens were prepared from bovine incisors,and were randomly divided into 4 groups(n=3)after acid-etching by 37%phosphoric acid.Specimens in group A(control)was processed daily with normal saline;those in group B and C were treated once with Duraphat varnish and Fluor Protector varnish respectively;in group D was daily processed with fluoride toothpaste. All specimens were incubated in artificial saliva for 2 weeks.Then all specimens received acid-etching again.Micro-hardness test, SEM observation and image analysis were performed before and after each step.Results:After 2 weeks of processing,no remineraliza-tion was found in group A.Varnish layers were observed on the surface of specimens in group B and C.In group D remineralization was detected on the enamel surface.After re-etching,micro-hardness decreased in group A and D.Fluoride varnish layers in group B and C showed strong resistance to acid-etching.After re-etching,area of micro-holes in group A and D increased(P<0.05 ),but that in group D was smaller than in the control(P<0.05).No micro-hole was observed in group B and group C.Conclusion:Protec-tive layer formed on the enamel surface by fluoride varnish is resistant to acid-etching and promotes enamel remineralization.Fluoride toothpaste application can promote enamel remineralization,but with less resistance to acid.

Indicações clínicas para o uso do dentifrício de baixa concentração de flúor / Clinical indications for the use of the low-concentration fluoride dentifrice

O dentifrício com concentração entre 1000 a 1500 ppmF, tambémchamado convencional, tem efeito anticárie claramente evidenciadona literatura. Entretanto, há uma discussão em torno de que a suaingestão por crianças menores poderia estar associado à fluorose; oque tem resultado na recomendação de uso de dentifrícios commenores concentrações do fluoreto para esse grupo específico.Nesse contexto, duas questões principais precisam ser elucidadas: 1) Há evidência do efeito anticárie a partir do uso de dentifrícios debaixa concentração de flúor? 2) O uso desses dentifrícios contribuipara a redução da prevalência de fluorose na dentição permanente?À luz da literatura atual, pode-se observar que só que dentifrícios deconcentração de 1000 ppmF ou superior podem ser seguramenteindicados como medida preventiva da cárie e, que não há evidênciasque suportem que o uso de dentifrícios de baixa concentração deflúor reduza risco à fluorose. Haja vista que a cárie na primeirainfância é um problema de saúde pública que se inicia precocementee tende a aumentar com idade é importante a adoção de medidaspreventivas específicas para essa faixa etária. Assim, recomendamsecomo boas práticas de saúde bucal para crianças: que aescovação deva se iniciar tão logo erupcione os primeiros dentes,devendo ser realizada duas vezes ao dia sob a supervisão dosresponsáveis, usando uma pouca quantidade de dentifrício comconcentração convencional.

The anti-caries efficiency of F dentifrices containing about 1100 ppmF, also called conventional, it is well documented. However its use byyoung children is also pointed out as risk factor to dental fluorosis. Thus, low-F dentifrice has been recommended for young children asan alternative to reduce dental fluorosis risk. In this sense, twoprincipal issues must be elucidated: a) Is there evidence of the anticaries effect from the use low-F dentifrice? b) The use of low-Fdentifrices by young children contributes to reduce the prevalence of fluorosis in permanent dentition? Evidence-based literature show thatonly dentifrice with 1000 ppmF (or more) can be safely indicated forpreventing dental caries, and it is uncertain that the use of low-Fdentifrice by young children can reduce dental fluorosis risk. Earlychildhood caries is universal health problem that prevalence increasedwith age, so is important to adopt preventive measures for this agegroup. In conclusion, we can be recommended as good oral healthpractices for children: the brushing should begin as soon teeth erupted, it should be realized twice daily with fluoridated toothpaste under the supervision, using a small amount of conventional dentifrice.

A clinical study of using fluoride toothpaste to prevent enamel decalcification in orthodontic treatment with fixed appliance / 重庆医科大学学报

0.05).The incidence of patients of the fluoride group was lower than that of the control group after treatment (P0.05);the EDI of the fluoride group was lower than that of the control group (P