To evaluate the ability of casein phosphopeptide/amorphous calcium phosphate (CPP/ACP) and lysozyme, lactoferrin, and lactoperoxidase (LLL) added to glass ionomer cement (GIC) to inhibit the growth ...of S. mutans in a caries model.
Eighty permanent third molars were selected. The dentin of these teeth was exposed and flattened. Except for the coronal dentin, the specimens were waterproofed, autoclaved, and submitted to cariogenic challenge with standard strain of S. mutans. The carious lesions were sealed as follows: group 1 (n=20): GIC without additives; group 2 (n=20): GIC + CPP/ACP; group 3 (n=20): GIC + LLL; group 4 (n=20): GIC + CPP/ACP + LLL. S. mutans counts were performed before the caries were sealed (n=5), after 24 hours (n=5), at 1 month (n=5), and at 6 months (n=5). The results were analyzed using descriptive statistical analysis and the Kruskal-Wallis test (Student-Newman-Keuls test).
GIC + LLL caused a significant reduction of S. mutans 1 month after sealing (p<0.01); however, there was a significant growth of S. mutans 6 months after sealing. GIC, GIC + CPP/ACP, and GIC + CPP/ACP + LLL showed similar behavior with significant reduction of S. mutans after 24 hours (p<0.05) and increase after 1 and 6 months.
The addition of LLL to GIC increases the antimicrobial action of GIC on S. mutans. This leads to control of bacterial biofilm for 1 month, thus stopping the progression of carious lesions.
To assess the influence of dentin substrate and chlorhexidine on the marginal seal of composite resin restorations.
The sample comprised 20 third molars. Four cavities were drilled in the dentin sur ...face, followed by sealing and restoration of sound dentin (n = 10) or carious dentin (n = 10). In the control group, cavities were immediately restored as follows: G1: one-bottle bonding agent (OB) + composite resin (CR); G2: chlorhexidine 2.0% (CLX) + OB + CR; G3: self-etch bonding agent (SE) + CR; G4: CLX + SE + CR. In the experimental group (carious dentin), carious lesions were induced with S. mutans and cavities were restored as in the control group. Five specimens from each group (sound and carious) were stored in brain-heart infusion (BHI) medium for 6 months. All specimens were submerged in methylene blue 0.5% to test for microleakage. The Kruskal-Wallis and Student-Newman-Keuls tests were used to assess results.
On immediate assessment, there were no significant between-group differences in the sound dentin group, whereas in carious dentin, there was less leakage when OB and CLX were used. At 6 months, there was less leakage in the sound dentin group when OB and CLX were used; there were no between-group differences in carious dentin. Comparison of immediate and 6-month assessments showed a significant increase in leakage at 6 months when sound dentin was treated with SE and CLX and when carious dentin was treated with OB and CLX.
To ensure better dentin hybridization and preservation of the organic constituents of the dentin matrix, the properties of chlorhexidine digluconate and the components of the resin matrix must be taken into account.
Metalloproteinases influence degradation of the hybrid layer in composite resin restorations, regardless of whether the bonding system used is one-bottle or self-etching.
Svrha: Željela se procijeniti moguća inhibicija rasta bakterije S. mutans na karioznom modelu koristeći se stakloionomernim cementom (GIC) pomiješanim s kazein fosfopeptidom/amorfnim kalcijevim ...fosfatom (CPP/ACP) te lizozimom, laktoferinom i laktoperoksidazom (LLL). Materijali i metode: Odabrano je osamdeset trajnih trećih kutnjaka (molara). Dentin tih zuba ogoljen je i zaglađen.
Osim koronalnoga dijela dentina, ostatak zuba hermetički je zabrtvljen, steriliziran i izvrgnut karijesnom utjecaju S. mutans. Karijesne lezije zatvorene su kako slijedi: grupa 1 (n = 20): GIC bez dodataka; grupa 2 (n = 20): GIC + CPP/ACP; grupa 3 ( n= 20): GIC + LLL; grupa 4 (n = 20): GIC + CPP/ACP + LLL. Broj bakterija S. mutans određivao se prije nego što su karijesni zubi zatvoreni (n = 5), nakon 24 sata (n = 5), nakon mjesec dana (n = 5) i nakon šest mjeseci (n = 5). Rezultati su analizirani opisnom statističkom analizom i Kruskal-Wallisovim testom (Student-Newman-Keulsov test). Rezultati: Mjesec dana nakon zatvaranja kombinacija GIC + LLL uzrokovala je značajnu redukciju rasta S. mutans (p < 0,01), no unatoč tomu zabilježen je značajan rast S. mutans šest mjeseci nakon zatvaranja. Uzorci GIC-a, GIC + CPP/ACP i GIC + CPP/ACP + LLL imali su značajnu redukciju S. mutans nakon 24 sata (p < 0,05), ali i porast broja bakterija nakon mjesec dana i šest mjeseci. Zaključak: Dodavanje LLL-a u GIC snažnije antimikrobno djeluje na S. mutans. To rezultira jednomjesečnom kontrolom bakterijskoga biofilma, što na kraju zaustavlja karijesnu leziju.
Objective: To evaluate the ability of casein phosphopeptide/amorphous calcium phosphate (CPP/ACP) and lysozyme, lactoferrin, and lactoperoxidase (LLL) added to glass ionomer cement (GIC) to inhibit ...the growth of S. mutans in a caries model. Material and methods: Eighty permanent third molars were selected. The dentin of these teeth was exposed and flattened. Except for the coronal dentin, the specimens were waterproofed, autoclaved, and submitted to cariogenic challenge with standard strain of S. mutans. The carious lesions were sealed as follows: group 1 (n=20): GIC without additives; group 2 (n=20): GIC + CPP/ACP; group 3 (n=20): GIC + LLL; group 4 (n=20): GIC + CPP/ACP + LLL. S. mutans counts were performed before the caries were sealed (n=5), after 24 hours (n=5), at 1 month (n=5), and at 6 months (n=5). The results were analyzed using descriptive statistical analysis and the Kruskal-Wallis test (Student-Newman-Keuls test). Results: GIC + LLL caused a significant reduction of S. mutans 1 month after sealing (p<0.01); however, there was a significant growth of S. mutans 6 months after sealing. GIC, GIC + CPP/ACP, and GIC + CPP/ACP + LLL showed similar behavior with significant reduction of S. mutans after 24 hours (p<0.05) and increase after 1 and 6 months. Conclusion: The addition of LLL to GIC increases the antimicrobial action of GIC on S. mutans. This leads to control of bacterial biofilm for 1 month, thus stopping the progression of carious lesions. Key words Caries; Streptococcus mutans; casein phosphopeptide-amorphous calcium phosphate nanocomplex; Glass Ionomer Cements; Anti-Bacterial Agents; Muramidase; Lactoferrin; Lactoperoxidase Svrha: Zeljela se procijeniti moguca inhibicija rasta bakterije S. mutans na karioznom modelu koristeci se stakloionomernim cementom (GIC) pomijesanim s kazein fosfopeptidom/amorfnim kalcijevim fosfatom (CPP/ACP) te lizozimom, laktoferinom i laktoperoksidazom (LLL). Materijali i metode: Odabrano je osamdeset trajnih trecih kutnjaka (molara). Dentin tih zuba ogoljen je i zagladen. Osim koronalnoga dijela dentina, ostatak zuba hermeticki je zabrtvljen, steriliziran i izvrgnut karijesnom utjecaju S. mutans. Karijesne lezije zatvorene su kako slijedi: grupa 1 (n = 20): GIC bez dodataka; grupa 2 (n = 20): GIC + CPP/ACP; grupa 3 (n= 20): GIC + LLL; grupa 4 (n = 20): GIC + CPP/ACP + LLL. Broj bakterija S. mutans odredivao se prije nego sto su karijesni zubi zatvoreni (n = 5), nakon 24 sata (n = 5), nakon mjesec dana (n = 5) i nakon sest mjeseci (n = 5). Rezultati su analizirani opisnom statistickom analizom i Kruskal-Wallisovim testom (Student-Newman-Keulsov test). Rezultati: Mjesec dana nakon zatvaranja kombinacija GIC + LLL uzrokovala je znacajnu redukciju rasta S. mutans (p < 0,01), no unatoc tomu zabiljezen je znacajan rast S. mutans sest mjeseci nakon zatvaranja. Uzorci GIC-a, GIC + CPP/ACP i GIC + CPP/ACP + LLL imali su znacajnu redukciju S. mutans nakon 24 sata (p < 0,05), ali i porast broja bakterija nakon mjesec dana i sest mjeseci. Zakljucak: Dodavanje LLL-a u GIC snaznije antimikrobno djeluje na S. mutans. To rezultira jednomjesecnom kontrolom bakterijskoga biofilma, sto na kraju zaustavlja karijesnu leziju. Kljucne rijeci karijes; Streptococcus mutans; kazein fosfopeptidamorfni kalcijum fosfat nanokompleks; stakleno-ionomerni cementi; antibakterijska sredstva; muramidaze; laktoferin; laktoperoksidaze
Background
The diagnosis of oral and maxillofacial mature T/NK‐cell neoplasms is challenging because of their rarity, morphological heterogeneity and complex immunophenotype with scarce available ...data describing their clinical and microscopic aspects. Therefore, in this study, we investigated a series of mature T/NK‐cell neoplasms affecting this anatomical region and provided an updated literature review.
Methods
Cases diagnosed as mature T/NK‐cell lymphomas affecting the oral and maxillofacial region were retrospectively retrieved from six pathology files and their diagnoses were confirmed using haematoxylin and eosin‐stained slides, immunohistochemical reactions and in situ hybridization for Epstein‐Barr virus (EBV) detection. Patients’ clinical data were collected from their pathology forms.
Results
A total of 22 cases were included in this study. Eleven (50%) consisted of extranodal NK/T‐cell lymphomas, nasal type; eight (36.4%) were peripheral T‐cell lymphomas, NOS; two (9.1%) were adult T‐cell leukaemia/lymphomas, and one (4.5%) was an ALK‐positive anaplastic large cell lymphoma. Overall, males predominated, with a mean age of 55.7 years. The palate was the most affected site (50%), and tumours usually presented as destructive and painful ulcers. EBV was present in all cases of extranodal NK/T‐cell lymphoma nasal type but was absent in the other subtypes.
Conclusion
Among mature T/NK‐cell lymphomas of the oral and maxillofacial region, extranodal NK/T‐cell lymphoma, nasal type and peripheral T‐cell lymphoma, NOS predominated. Older men were the most affected patients, and this heterogeneous group of neoplasms has a very aggressive clinical behaviour.
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