Rezin İnfiltrasyon Tekniğinin Ağartma İşlemi Uygulanmış Başlangıç Çürük Lezyonları Üzerine Etkisinin Değerlendirilmesi
Aynur Horuztepe, Sıdıka
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The aim of this in vitro study was to investigate the effect of resin infiltration on color and microhardness of white spot lesions treated with bleaching and to analysis of the penetration of the infiltrant. Enamel specimens were prepared from extracted bovine incisors (n=135). Initial color and surface hardness were measured with spectrophotometer using the CIE L*a*b* system, Vita Classical shade guide and a hardness device, respectively. After producing artificial white spot lesions, color and hardness values were remeasured. Then specimens were randomly divided into three groups (n=45per group): Group I-resin infiltrated; Group II- bleached; Group III-bleached/resin infiltrated. Resin infiltration was performed after the bleached samples submitted to a pH-cycling regime for two weeks in group III and the specimens resubjected to a pH cycling regime for two weeks. After subjecting all specimens to pH cyclus, assessment of color and microhardness were repeated after 4 weeks of treatments. Color alterations and the percentage of surface microhardness recovery (SMHR) were calculated. The penetration of infiltrant was evaluated with scanning electron microscope. Data were submitted to one-way ANOVA and Tukey test (5%). There were no significant differences between Group I and III in SMHR values (p=1.00). Bleached samples showed the lowest SMH recovery (p < 0.05). In terms of color, no statistically significant differences were found in ΔE* values between group I and II (p=0.525). Color alterations (ΔE*) were observed in all groups with the highest of group III. The bleaching treatment prior resin infiltration, produced significant color alteration in demineralized enamel. It was concluded that the microhardness of carious lesions increased with the infiltration of resin. Furthermore, the bleaching treatment prior resin infiltration, produced no significant alteration on microhardness. The penetration of resin infiltrant was significantly deeper in Group I. Within the limitations of this study, it can be concluded that the bleaching treatment before the resin infiltration produced significant color alteration in tested specimens. Resin infiltration was shown to significantly increase micro-hardness of demineralized enamel in Group I and III. The bleaching treatment infiluenced the penetration of the infiltrants negatively.