Aim:
The aim is to compare and evaluate the different finishing and polishing systems for the change in surface roughness of resin composites and enamel.
Materials and Methods:
To conduct the study, 30 extracted human maxillary central incisors were selected, decoronated, and molded in self-cure acrylic molds. A box-shaped cavity of dimensions 3 mm × 3 mm × 2 mm was prepared in all the teeth. A nanohybrid composite resin (Filtek Z250) was then used to restore the prepared cavities. Thirty samples were divided into two groups, control group (Group A,
n
= 10) and experimental group (Group B,
n
= 20). The samples in Group A were cured through the Mylar matrix. The experimental group, i.e., Group B was divided into two subgroups, i.e., Subgroup BX,
n
= 10 in which Sof-Lex polishing system was used for polishing the tooth surface and Subgroup BF,
n
= 10 in which Shofu composite polishing system was used. The mean surface roughness (Ra in μm) of the composite restoration as well as for the enamel surface of all the samples before and after polishing was measured with a contact profilometer, and the values were correlated with scanning electron microscopy.
Results:
The statistical analysis was carried out using paired
t
-test. The results exhibited a significant decrease in the surface roughness of the resin composite and enamel surface irrespective of the finishing and polishing system used. The mean surface roughness values demonstrated by Mylar matrix was the lowest followed by Sof-Lex polishing system. Shofu polishing system demonstrated the highest surface roughness values.
Conclusion:
Finishing and polishing of composite restoration can achieve a surface roughness similar to that of enamel. Involvement of marginal enamel in finishing and polishing procedures carried out for composite restoration results in smoother enamel surface.
Aim:
This study was conducted to evaluate and compare fluoride ion release by Cention-N (self-cure and light-cure) and conventional glass-ionomer cement (GIC) at different pH and time intervals.
Methodology:
Cavities of similar dimensions were prepared in mandibular molars and restored with Cention-N (by self-cure and light-cure techniques) and GIC. Samples were stored in deionized water, and the cumulative fluoride ion release and change in pH were assessed utilizing spectrophotometer and pH meter, respectively, at the end of 7 days, 14 days, and 21 days. The data thus obtained were statistically analyzed.
Results:
All the tested materials released fluoride ions in both acidic and neutral pH at all time intervals, and the fluoride ion release was significantly higher (<0.05) in acidic pH as compared to neutral pH except in GIC. All the groups showed a statistically significant increase in pH in acidic medium, whereas no significant increase was observed in neutral medium.
Conclusions:
Cention-N (self-cure) has the highest fluoride ion release and alkalizing potential in acidic pH as compared to Cention-N (light-cure) and GIC.
Excessive gingival display, commonly referred to as ‘gummy smile’ is a major hurdle in overall personality of an individual. Gummy smile, secondary to altered passive eruption and tooth mal-positioning, can be predictably treated with Surgery and orthodontic therapy. In patients with jaw deformities, orthognathic surgery can be performed. However, this requires hospitalization and entails significant discomfort. Lip repositioning is a simple surgical procedure to treat ‘gummy smile’. The procedure restricts the muscle pull of the elevator lip muscles thereby reducing the gingival display while smiling. This procedure is safe and predictable with minimal risk or side effects. This case report describes the successful treatment of excessive gingival display using surgical lip repositioning procedure which can be used as an alternative treatment modality for treatment of excessive gingival display.
The endodontic treatment of a mandibular molar with aberrant canal configuration can be diagnostically and clinically challenging. This case report presents the treatment of a mandibular first molar with six root canals, of which three canals were located in the mesial root and three in distal root. Third canals were found between the two main root canals. This case presents a rare anatomic configuration and points to the importance of expecting and searching for additional canals.
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