Comparative Evaluation of Ion Release in Bonded and Nonbonded Stainless Steel Brackets with Use of Different Mouthwashes: An In vitro Study.

BACKGROUND: Orthodontic treatment is a long-term procedure that involves the usage of brackets and archwires which are mainly metallic in nature. This study evaluated the levels of metal ions release from bonded and nonbonded orthodontic brackets after immersion in distilled deionized water and three different types of mouthwash. MATERIALS AND METHODS: Eighty premolar stainless steel brackets (3M, Unitek) were divided into Group A (bonded brackets) and Group B (nonbonded brackets). Each group was further subdivided into four subgroups to analyze the release of ions from three different types of mouthwash along with the control group. All the samples were incubated at 37°C for 45 days, and immersion solutions were tested in inductively coupled plasma-optical emission spectrometer for the release of free metal ions. RESULTS: Mean ion release in the bonded bracket group was less than that of nonbonded bracket group. Ion release in control subgroup of both groups was 0.18 ± 0.08 µg/dl (A1) and 0.17 ± 0.06 µg/dl (B1); in Phos-Flur mouthwash subgroup was 0.12 ± 0.06 µg/dl (A2) and 0.13 ± 0.05 µg/dl (B2); in chlohex mouthwash subgroup was 0.13 ± 0.06 µg/dl (A3) and 0.14 ± 0.06 µg/dl (B3); in Hiora mouthwash subgroup was 0.10 ± 0.06 µg/dl (A4) and 0.12 ± 0.05 µg/dl (B4). CONCLUSIONS: The mean ion release was the highest in deionized water (control group) followed by chlohex, Phos-Flur, and Hiora in both Group A and Group B. Ion leaching from bonded brackets was less compared to nonbonded brackets in all different mouthwashes except in the control group. However, this difference was statistically insignificant (P > 0.05) between all the groups.

Evaluation of the effect of different surface treatments on the retention of posts: a laboratory study.

BACKGROUND AND OBJECTIVES: There are numerous post and core systems variety of materials. Several methods are used to increase the retentive strength.The present study was conducted with the purpose of analysis of the effect of surface treatment with ethyl alcohol, resin primer and air-borne alumina particle abrasion on retention of glass fiber posts, carbon fiber posts and cast metal posts MATERIALS AND METHODS: Surface treatment of glass fiber posts, carbon fiber posts and cast metal posts was done with ethyl alcohol, resin primer and air-borne alumina particle abrasion and cemented with dual cure resin cement into the post spaces prepared in the teeth. For the Retentive force test, a screw driven universal testing machine was used to apply tensile load to the post. The force required to dislodge each post from prepared post space was recorded. STATISTICAL ANALYSIS: Comparison of the mean retentive strength was done using two-way Analysis of Variance (ANOVA) followed by Bonferroni method for multiple comparisons. RESULTS: Significant difference in the retentive strength between air borne alumina particle abrasion and resin primer treated posts was (P < 0.001) noticed. Further, there was no significant difference between ethyl alcohol and resin primer treated posts. CONCLUSION: Air-borne alumina particle abrasion increased the retentive strength of all the type of posts used in this study. Treating the surface of the posts with resin-primer and ethyl alcohol produced no statistically significant difference in the retentive strength.

A Combined Surgical and Prosthetic Approach for the Successful Management of a Mutilated Eye Socket: A case report.

Facial disfigurement through the loss of an eye due to a road traffic accident can be devastating for the patient and may leave few options for an ophthalmologist, especially if the situation demands urgency. In the present case report, the patient had a major accident, which resulted in the severe disruption of the socket. The requirements of the prosthodontist regarding the morphology of the socket guided the ophthalmologist to undertake reconstructive surgery. The prosthesis was then fabricated such that both its longevity and the morphology of the socket were safe guarded.