Evaluation of stress and deformation in bone with titanium, CFR-PEEK and zirconia ceramic implants by finite element analysis.

Background: As more recent implant biomaterials, Zirconia ceramic and glass or carbon fibre reinforced PEEK composites have been introduced. In this study, bone stress and deformation caused by titanium, carbon fiber-reinforced polyetheretherketone (CFRPEEK), and zirconia ceramic implants were compared. Materials and Methods: In this in vitro finite element analysis study, a geometric model of mandibular molar replaced with implant supported crown was generated. The study used an implant that was 5 mm diameter and 11.5 length. Three implant assemblies made of CFR- polyetheretherketone (PEEK), zirconium, and titanium were created using finite element analysis (FEM). On the implant's long axis, 150 N loads were applied both vertically and obliquely. ANSYS Workbench 18.0 and finite element software were used to compare the Von Mises stresses and deformation produced with a significance level of P < 0.05. Results: With no discernible differences, all three implant assemblies that is CFR-PEEK, titanium, and zirconia demonstrated similar stresses and deformation in bone. Conclusion: It was determined that zirconia and PEEK and reinforced with carban fibres (CFR-PEEK) can be used as titanium-free implant biomaterial substitutes.

Double facial and a lingual trace talon cusps: a case report.

Talon cusp is an uncommon odontogenic anomaly, presented as an accessory cusp like structure on the crown of an anterior tooth. Their presence may create diagnostic, esthetics, occlusal, pulpal and periodontal problems. This case report describes an unusual double facial talon cusp along with lingual trace talon on left maxillary central incisor.

Comparative evaluation of trace elements and residual bacterial contents of different brands of bottled waters.

The present study was conducted to evaluate the comparative levels of cariostatic and caries potentiating trace elements and to detect residual coliform bacteria in six different bottled waters. Trace elements and fluoride were estimated using Inductively Coupled Plasma Optical Emission Spectrometer and fluoride ion electrode respectively. Coliform bacteria were detected by multiple tube method. It was found that, trace elements were below the significant caries potentiating or cariostatic levels and none of the samples showed coliform bacterial growth. It can be concluded from the present study that these water samples can be safely consumed without any dental ill effects.