PURPOSE The purpose of this study was to identify the most caries-susceptible site of pits and fissures on first permanent molars by quantitative evaluation of the mineralization in both caries-active and caries-free children, and to provide helpful information for cost-effective, targeted prevention. METHODS Eighty-four caries-free and 85 caries-active children were selected from 800 6- to 7...

Lucas Kwok’s Fifth Region is a speculative spatial narrative. Positing new region in the air above Hong Kong 2060, as city below has become too crowded to live in. At time when previously scripted futures of this are currently being hastily re-written, presents an allegorical parable, critique overpopulation, density and government control land, well imaginary vision utopia escaping below. proj...

The case of a 3 11/12-year-old Chinese boy with the dental abnormalities of "otodental" dysplasia is reported. Hearing was normal. Dental anomalies consisted of delayed eruption of globe-shaped molars, bulbous deciduous canines, and double pulp chambers in the molars. Radiographs taken 4 years later showed taurodontic molars, supernumerary microdontic teeth, retarded formation of premolars, and...

E ctopic eruption of the permanent first molar is a local eruption disturbance in the developing permanent dentition. This abnormal eruption pattern is most commonly seen in the maxillary arch. The abnormal mesioangular eruption path of the maxillary first molar causes resorption of the distal root of the adjacent primary second molar. Progression of ectopic eruption may cause impacted permanen...

PATIEN'l' J. Z., a white boy 13 years 9 months of age, had a Class II, Division 1 malocclusion. This diagnosis could be determined only in the canine area, since no mandibular molars were present on either the right or the left side. The maxillary arch was normal in width and in protraction. The maxillary right second premolar was blocked out lingually and rotated mesially, and the maxillary le...

introduction: the aim of this study was to evaluate the root canal morphology of mandibular first and second molars using cone-beam computed tomography (cbct) in northern iranian population and also to indicate the thinnest area around root canals. methods and materials: we evaluated cbct images of 154 first molars and 147 second molars. by evaluating three axial, sagittal and coronal planes of...

Dento-alveolar disharmony with crowding is a common reason for orthodontic treatment not fully understood or unequivocally demonstrated causes. This study investigated the correlations between teeth dimensions, arch lengths, and during mixed dentition period. A cross-sectional on 100 dental casts of patients class I malocclusions was performed. Dental arches were classified as non-crowded, mode...

Heterogeneous ultra dense networks (HUDNs) and non-orthogonal multiple access (NOMA) have been identified as two proposing techniques for the fifth generation (5G) mobile communication systems due to their great capabilities to enhance spectrum efficiency. This article investigates the application of NOMA techniques in HUDNs to support massive connectivity in 5G systems. Particularly, a unified...

Removal of heavy metals will allow elimination of toxic substances from environmental samples or will prevent their introduction into the environment. Silica gel will be used to form a complex with other compounds such as nitrilitriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA) and 2mercaptoethanol by an acid catalyzed condensation. Compounds such as NTA were suspended with silica ge...