Structural and Functional Histology of Human Salivary Glands:Clinical Relevance to Prosthodontics and Dental Materials Interaction
Salivary glands; Histomorphometry; Prosthodontics; Dental materials; Xerostomia
AuthorsABSTRACTHuman salivary glands are among the most complex exocrine organs, and their histologically organized parenchyma determines the qualitative and quantitative composition of saliva, which is essential for oral homeostasis and long-term prosthetic rehabilitation. This study elucidated the structural and functional histology of the three major human salivary glands using haematoxylin and eosin (H&E) and periodic acid-Schiff (PAS) staining, quantitative histomorphometric analysis, and correlation with salivary functional parameters and pellicle formation on contemporary dental materials. Forty-five human glandular specimens (15 parotid, 15 submandibular, and 15 sublingual) were collected from 15 adult cadavers. Specimens were routinely processed, sectioned, and stained with H&E and PAS. Quantitative morphometric analysis was performed on ten high-power fields, and salivary functional parameters were measured in 60 healthy adult volunteers. Contact angle analysis was also conducted on five categories of dental materials before and after 60 minutes of salivary conditioning. Significant differences were observed among glands in acinar cell morphology, serous-to-mucous acinar ratio, ductal architecture, and PAS-positive secretory granule density. Acinar cell volumetric measurements were positively correlated with stimulated salivary flow volume (r=0.72, p<0.001). After salivary conditioning, zirconia showed the lowest contact angle and greatest surface free energy, whereas silicone-modified soft liners remained the most hydrophobic. H&E and PAS histomorphic analysis provides meaningful indices of salivary secretory capacity and biomaterial-surface interactions relevant to prosthodontics.
INTRODUCTIONIn humans, the salivary glands (parotid, submandibular, and sublingual) are some of the most histologically varied exocrine organs; architectural complexity reflects the variation in salivary activity. Together with the hundreds of minor salivary glands located throughout the oral mucosa, the major salivary glands produce between 0.5 and 1.5 litres of saliva daily in a developing physiological state [1]. The salivary gland consists of a complex combination of water, electrolytes, mucous glycoproteins, digestive enzymes, antimicrobial proteins, growth factors, and immunoglobulins, and the specific composition of this fluid is determined by the histology of the secretory functional cells [2,3]. Thus, the architecturally structured salivary tissue goes beyond simply describing the architecture of salivary gland tissue; it is the biological substrate that utilises the anatomy of the salivary gland as a basis for function specifically salivary gland function, which affects the success of prosthodontic rehabilitation. The parotid gland is a purely serous exocrine organ that is histologically composed of tightly packed spherical to pyramidal acini, exhibiting abundant basophilic granular cytoplasm, round nuclei located at the basal portion of the cell, and discrete zones of secretory granules located at the apical pole of the cell, as determined by haematoxylin and eosin (H&E) staining. These serous acinar cells are responsible for producing large •••••••••••••••••••••••••••••••• ejprd.org - Published by Riset Publishing Services LLC.
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