Understanding the formation of maxillary sinus in Japanese human foetuses using cone beam CT

Abstract

The formation of the maxillary sinus (MS) is tied to the maturation of the craniofacial bones during development. The MS and surrounding bone matrices in Japanese foetal specimens were inspected using cone beam computed tomography relative to the nasal cavity (NC) and the surrounding bones, including the palatine bone, maxillary process, inferior nasal concha and lacrimal bone. The human foetuses analysed were 223.2 ± 25.9 mm in crown-rump length (CRL) and ranged in estimated age from 20 to 30 weeks of gestation. The amount of bone in the maxilla surrounding the MS increased gradually between 20 and 30 weeks of gestation. Various calcified structures that formed the bone matrix were found in the cortical bone of the maxilla, and these calcified structures specifically surrounded the deciduous tooth germs. By 30 weeks of gestation, the uncinate process of the ethmoid bone formed a border with the maxilla. The distance from the midline to the maximum lateral surface border of the MS combined with the width from the midline to the maximum lateral surface border of the inferior nasal concha showed a high positive correlation with CRL in Japanese foetuses. There appears to be a complex correlation between the MS and NC formation during development in the Japanese foetus. Examination of the surrounding bone indicated that MS formation influences maturation of the maxilla and the uncinate process of the ethmoid bone during craniofacial bone development.

Quantitative and qualitative bone analysis in the maxillary lateral region

“…The roots of the posterior teeth are located close to the maxillary sinus floor and can be found outside the maxilla by 30 weeks of gestation. Therefore, the roots of the first and second molars are located in close proximity to the maxillary sinus floor [5].…”

Cone-beam computerized tomography imaging and analysis of the upper airway: a systematic review of the literature

“…As a result, new possibilities and applications for CBCT have arisen in the fields of OMF surgery, dentistry and otorhinolaryngology. Upper airway analysis in particular has become increasingly relevant mainly due to the relationship between morphological airway character- Frankfort plane parallel to the floor 24,67 Natural head position 45,72 Craniocervical inclinations were examined to ensure they were between 908 and 1108 44 Head fixed in the operative position at the centre of the C-arm using a brace 59 After image acquisition, head was oriented so that it was straight with no cant 70 After image acquisition, head was oriented according to a line 68 down from the sella-nasion as the horizontal axis 37 Not specified 2,3,15,29,35,39,47,52,61,64 Not relevant 11,12,18,21,40,43,62,73,75 Mandibular position control…”

“…The effects of RPE on the maxilla were studied by one research group 35 who reported a statistically significant increase in nasal width and a decrease in maxillary sinus width. CBCT was also used to investigate the prevalence of sphenoid sinus hypoplasia and agenesis in the Turkish population 17 and the formation of the maxillary sinus in Japanese fetuses 11 .…”

Topography of the nasolacrimal duct on the lateral nasal wall in Koreans

“…Defining the position of the nasolacrimal sac and duct during this surgical procedure is important. Studies defining the nasolacrimal apparatus in cadavers and in healthy people using computed tomography have been reported in the literature [1,11,15]. McCormick and Sloan [11] measured the diameter of the nasolacrimal canal using computed tomography and analyzed according to gender and racial differences.…”