Permanent Maxillary and Mandibular Incisors

The permanent incisors are the front teeth that erupt between 6 and 8 years of age. They are eight in number, four upper and four lower, two centrals and two laterals. They have sharp biting surfaces designed for shearing and cutting of food materials into small chewable pieces. They are the teeth most visible to the others during eating, smiling and talking, and thus, they have high aesthetic value for the individuals. The unique characteristics, arch position, function, development and chronological age of each tooth will be highlighted. In addition, the different aspects with their geometric outlines, outlines and surface anatomy of these teeth will be described. A brief explanation about the pulp cavity, tooth socket and normal occlusion for each tooth will be included

Effects of aqueous cinnamon extract on chemically-induced carcinoma of hamster cheek pouch mucosa

This study aimed to investigate the effects of aqueous cinnamon extract (ACE) on 7, 12-Dimethylbenz[a]anthracene (DMBA)-induced oral carcinogenesis in hamster cheek pouch (HCP) mucosa. Sixty male Syrian hamsters were randomly divided into six equal groups. The hamsters of groups I, II and III received no treatment, DMBA and ACE respectively, for 16 weeks. Groups IV and V were handled as group II and concomitantly treated with ACE for the same period and additionally group V received ACE for other 16 weeks after the stoppage of DMBA application. Group VI hamsters were handled as group III and additionally received DMBA for other 16 weeks after the stoppage of ACE supplementation. Hamsters of each group were euthanized according to the experimental schedule. The buccal pouches were and prepared for H&E stain, PAS reagent, CD3 and PDGF immunohistochemical reactivity. All groups showed dysplastic changes with varying degrees except groups I and III. Deep invasive carcinomas were recorded in 90% of the samples of group II, 60% of group IV, 50% of group V and 40% of group VI. From the previous results, it can be concluded that ACE has the potentiality preventing oral cancer initiation better than inhibiting oral cancer progression

Surface properties and elemental composition of human treated dentin matrix nano-scaffold as direct pulp capping material

Objective The aim of the study was investigating surface topography, roughness, and wettability of the TDM semi-rigid nano-scaffold. In addition to its chemical composition to prove the principle of using as direct pulp capping (DPC) material. Materials and methods: Forty sound and fully erupted premolars scheduled to be extracted for orthodontic treatment were involved for the TDM scaffolds preparation. The surface and chemical properties were investigated in comparison with UTD. The surface topography was investigated using SEM while AFM was used for studying SR. Surface wettability was analyzed via sessile-drop goniometry protocol. However, the elemental composition was analyzed using EDX. Result: The surface characterization of the TDM scaffolds revealed a nano-tubular pattern with high surface wettability. However, the elemental analysis revealed its optimum partial demineralization. Conclusion: the surface and elemental composition of TDM semi-rigid scaffold are promising to be a reasonable DPC material

Use of Melatonin/Decorticotomy and Autogenous Bone Graft in Induced 1-Wall Defect

ABSTRACT: Purpose: This study was designed to investigate the effect of intramarrow penetration (IMP) and 1% melatonin (MLN) gel on the remodelling process of autogenous bone graft (ABG) in an induced 1–osseous wall defect model. Methods: Sixty-four intrabony induced mandibular defects were created on the distal side of premolars—P1, P2, P3, and P4 (on each side)—in 8 beagle dogs. A ligature-induced periodontitis was initiated in each defect. Defects were then divided into 4 equal groups. Group I was treated with open-flap debridement (OFD) alone, group II was treated with OFD/ABG, group III was treated with OFD/IMP/ABG, and group IV was treated with OFD/ABG/IMP/1% MLN gel. The study parameters were bone fill, histologic analysis, and immunohistochemical evaluation of endothelial nitric oxide synthase (eNOS) expression at 2-week (2W) and 8-week (8W) time intervals. Results: At 8W, significant differences were revealed amongst all groups regarding the amount of bone fill and eNOS expressions (P < .001). Bone fill percentages were 55.5%, 22.3%, 16.8%, and 0% in groups IV, III, II, and I, respectively. eNOS expressions were 1.68 ± 0.06, 8.43 ± 0.04, 16.80 ± 0.17, and 1.97 ± 0.07 in groups IV, III, II, and I, respectively. The favourable results were in line with group IV. Conclusions: According to these preliminary results, defects treated by ABG augmented with IMP and 1% MLN gel revealed a greater amount of bone fill and reduced eNOS expression. This combination is therefore highly suggested as an adjunct to ABG