ABSTRACT
A utilização da magnificação das estruturas na odontologia cresceu e ganhou importância entre os profissionais e, dentre os dispositivos utilizados para tal finalidade destacam-se as lupas e mais atualmente o microscópio clínico, que vem sendo introduzido pelos clínicos no consultório. O presente trabalho visa por meio de revisão de literatura apresentar o histórico da utilização do microscópio clínico, descrever seus componentes e finalidades e demonstrar as vantagens apresentadas pela utilização deste equipamento na resolução dos casos nas mais diversas especialidades odontológicas
The use of magnification in dentistry increased e reached importance for professionals and, among the devices used by this finality it detach the loupes and more recently the clinical microscope, that is been introduced by clinicians in surgery. The present study aimed by literature review show the history of use of clinical microscope, describe its parts e finality and demonstrate the advantages presented by use of this device to resolution of the cases in more different dentistry specialty
Subject(s)
Microscopy , DentistryABSTRACT
There are many concerns regarding the clinical behavior of packable composite restorations in Class II cavities, particularly when those restorations are subjected to axial mechanical loads. This study evaluated microleakage in vitro in proximal vertical "slot"-type cavities with walls located in enamel and dentin, filled with packable composite, associated or not associated with a flowable composite, a reinforced light-curing glass-ionomer or a compomer, after being submitted to occlusal load cycling. These preparations were subjected to either occlusal load cycling or no occlusal load cycling. Eighty human molars with enamel and dentin margins were treated with standardized cavity preparations (proximal vertical "slot" preparations). After completing the filling process using a packable composite (Filtek P60) with or without a cervical increment of flowable composite (Filtek flow), light-curing glass-ionomer (Vitremer) or compomer (Dyract AP), the molars were separated into two groups: control (without occlusal loading) and test, in which 4,000 one-second cycles of 150 N occlusal loading were applied. All 80 teeth were submitted to a microleakage test, then evaluated utilizing silver nitrate dye penetration. Significant statistical differences (Wilcoxon test, p<0.05) in the amount of leakage in enamel and dentin were found in both the control and test groups. After a paired comparison of the control and test groups, a significant statistical difference was found at the enamel level (Mann-Whitney test, p<0.05). In dentin, the only statistically significant difference found was the relation to the flow material. The Kruskal-Wallis test did not detect any statistically significant difference in the amount of leakage among the four materials studied, with a 5% level of significance for both enamel and dentin. Based on this data, it was concluded that restorations with margins located in dentin had greater microleakage than those restorations with margins located in enamel. When the samples were submitted to occlusal loading, they were negatively influenced, which increased microleakage values in enamel and dentin. There was no statistically significant difference among the four tested materials, when comparing their performance.
Subject(s)
Composite Resins/adverse effects , Dental Leakage , Dental Restoration, Permanent/methods , Tooth Cervix/physiology , Bite Force , Compomers , Dental Cavity Preparation/classification , Dental Enamel , Dental Leakage/diagnosis , Dental Leakage/etiology , Dental Restoration Failure , Dental Restoration, Permanent/adverse effects , Dental Stress Analysis , Dentin , Glass Ionomer Cements , Humans , Molar , Silver StainingABSTRACT
There are many doubts about the clinical behavior of condensable composite restorations in Class II cavities, particularly when they are submitted to axial mechanical loads. This study evaluated cervical microleakage in Class II direct fillings in composite, whether or not they were submitted to an occlusal load cycling. Twenty-three human molars with standardized cavities (proximal vertical "slot") were treated with enamel and cement endings. After completion of the filling process with condensable composite (Surefil), they were separated into two groups: control (without occlusal loading) and test, where 4,000 one-second cycles of 150 N occlusal loading were applied. Twenty teeth were submitted to a microleakage test and then evaluated according to dye penetration. Significant statistical differences (Wilcoxon test, p=0.005<0.05) of leakage degree in enamel and cement were found in the control group. Significant statistical differences at <0.05 were also found in the test group, with p=0.045. After paired comparison of the control and test groups, a significant statistical difference was found at the enamel level (Mann-Whitney test, p=0.03). However, no significant statistical differences were found at the cement level (p=0.28). Therefore, it could be concluded that there was greater microleakage in cement compared to enamel, and occlusal loading has a decisive influence, as it increases the rate of microleakage.
