| Objective: With the continuous innovation of dental instruments and materials and the rapid development of the corresponding theory,minimal invasive repair technology has been widely used.Pit and fissure caries were characterized by high incidence and developed from inside to outside.When the damage depth was more than 2mm,we needed for layered filling use the incremental technique to fill the cavity when the classical resin-composite was applied.SDRTM was a new-style resin-composite that could be applied to the cavity in the thickness of 4mm.This new type of composite resin could be used as a minimal invasive repair of pit and fissure caries filling materials and could be filled at one-time,which had the advantages of reducing clinical bedside operation time and so on.The purpose of this study was to provide a guide for selection of a material with good repair effect and convenient operation in the filling of pit and fissure caries by the comparison of SDRTM,3MTM ESPETM FiltekTM Z350 XT and Beautiful Flow Plus F00 on the difference of the clinical effect,microleakage and the gaps between fillings and teeth in the lab.Methods:1 The investigation of SDRTM,3MTM ESPETM FiltekTM Z350 XT and Beautiful Flow Plus F00 in the minimal treatment of pit and fissure caries.1.1 The selection of the cases48 cases with pit and fissure caries were chosen as the object of the study including 150 premolars and molars in the maxilla which were collected from the Department of Oral Medicine,Dental Hospital of Hebei Medical University.There were 22 males and 26 females aged from 14 to 45 in total.They were conformed to the standards as follows: pit and fissure caries that could stuck probes,deep pit and fissure which had the tendency of caries,the destructive depth of the caries arrived the superficial of dentin that the total depth was more than 2mm,the patients knew their conditions and agreed with the treatment.Proximal cavity,large-area and multiple-surface deep caries,the caries near the pulp,enamel hypoplasia,tetracycline pigmentation teeth and any other caries or fillings were eliminated.1.2 Experimental grouping and proceduresAll teeth were divided into three groups randomly with 50 in each group.The teeth of Group? were filled with SDRTM.Group ? were filled with3 MTM ESPETM FiltekTM Z350 XT and Group ? were filled with Beautiful Flow Plus F00.The mean depth of pit and fissure caries in Group ? was2.51±0.25 mm,Group ? was 2.53±0.26 mm,Group ? was 2.52±0.24 mm,and the mean depth of caries in the three groups was not statistically significant.Then we put on the rubber dams.The carious tissue of pit and fissure caries were removed with tinny high speed silicon carbide burs,wiped off by slow speed half ball type drill until the colour and texture became normal and refined to an slightly open shape.The following steps included: cleaning the surface and fissure of the tooth by a tiny conical-shape brush with a little dentifrice,rinsing thoroughly by distilled water,drying out,acid etching,rinsing and drying out again,applying bond and then lighting for 20 s.Group?: We rotated the bullet to a suitable angle and injected the SDRTM resin-composites to the cavity at once and slid along the bottom of the cavity back and forth with the probe to exhaust air bubble.Light curing was performed for 20 s.Group ? and Group ? : We injected the 3MTM ESPETM FiltekTM Z350 XT,Beautiful Flow Plus F00 resin-composite to the cavity in thickness of 2mm or less and avoided bubbling before exposure to light curing for 40 s in group ?and 20 s in group ?.Then we checked the occlusal surface of teeth if there were eminences.If there were,the eminences should be grinded selectively.After coronoplasty,we polished by slow speed rubber wheel dipped in polishing compound and recorded the filling time of every tooth.1.3 All prostheses and teeth were reviewed after one and three month regularly.2 The investigation of microleakage and bubble sites and observation by SEM of SDRTM,3MTM ESPETM FiltekTM Z350 XT and Beautiful Flow Plus F00resin-composite.2.1 Sample selection60 extracted premolars and molars without lesion,enamel hypoplasia,dental fluorosis or tetracycline pigmen and complete root tips were collected from the Department of Oral and Maxillofacial Surgery,Dental Hospital of Hebei Medical University and preserved in 4? normal saline after cleaning.2.2 Sample grouping and handlingAll teeth were divided into Group?,? and ? with 20 teeth in each group.Group ?were filled by SDRTM resin-composites.Group ?were filled by 3MTM ESPETM FiltekTM Z350 XT resin-composites.Group ? were filled by Beautiful Flow Plus F00 resin-composites.High speed silicon carbide burs and slow speed half ball type drill were used to prepare the slightly open shaped cavity with the depth of 2 to 3.5mm.The length of the cavity ranged from mesial to distal pit and fissure.Then we etched with the GLUMA ETCH20 Gel and applied Prime&Bond NT.The SDRTM resin-composites were injected to the cavity at once in group?.We injected the 3MTM ESPETM FiltekTM Z350 XT,Beautiful Flow Plus F00 resin-composites to the cavity in layers.All filled teeth were soaked in the artificial saliva at the constant temperature of 37? for 30 days and then applied to thermocycling test for500 times.10 teeth were picked out from each group randomly for microleakage test and the rest of each group were observed by SEM.2.3 Microleakage and bubble sites were recorded and analysed under the microscope and the gaps between fillings and teeth tissue by SEM.Results: 1 The filling operation time of three groups of flowing composite resin were in accordance with normal distribution.Group? was the shortest,had statistically significant differences from the other groups?P<0.05?.Group ? had difference with Group ??P<0.05?;2 There were no significant differences of three resin-composites in the aspect of prosthesis breakage,marginal seal,color coordination,marginal discoloration and secondary caries after one month and three month?P>0.05?;3 The observations of the depth on dye penetration were as follows: Group ? was the minimum,had statistically significant differences with group ? and ??P<0.05?.Group? had no significant difference with Group ??P>0.05?.The bubble conditions were as below: Group ? was the smallest,had statistically significant differences with group ? and ??P<0.05?.Group ?had no significant difference with Group ??P>0.05?;4 The results of the SEM: The gaps of Group ? were smaller than the other groups.There were significant differences between group ?and group ?,??P<0.05?.Group ?had no significant difference with Group ??P>0.05?.Conclusions:1 SDRTM has the shortest filling time among the three groups and it is significantly shorter than the other two groups.It proves that SDRTM has the advantage of one-time filling.2 The results of the review visit suggest that the SDRTM,3MTM ESPETM FiltekTM Z350 XT and Beautiful Flow Plus F00 resin-composites all have good clinical effect.3 The bubble form rate of SDRTM is the lowest,lower than Beautiful Flow Plus F00 and 3MTM ESPETM FiltekTM Z350 XT.The results show that the automatic leveling characteristics of SDRTM can make the filling material easier to combine with the tooth structure.4 The data obtained from the stereomicroscope indicates that the microleakage of SDRTM is the minimum.The SEM observation results demonstrate that the fissure width of SDRTM is the narrowest.The proprietary factor which is called dimethacrylate polyurethane resin of SDRTM can make the material and tooth tissue more tightly,more stable and more reliable. |
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