OCB02 2022 Functions of saliva 2.pdf

The Functions of Saliva Professor Gordon Proctor Lecture objectives To understand: 1.The dynamics of salivary secretion during 24hr 2.The contributions of different salivary glands to whole mouth saliva 3.That saliva coats the oral surfaces in a film and pellicle 4.Some of the many functions of sali...

The Functions of Saliva Professor Gordon Proctor Lecture objectives To understand: 1.The dynamics of salivary secretion during 24hr 2.The contributions of different salivary glands to whole mouth saliva 3.That saliva coats the oral surfaces in a film and pellicle 4.Some of the many functions of saliva in the mouth 5.The function of some specific, important components of saliva Lecture related questions 1.Which salivary glands contribute to whole mouth saliva? 2.Which salivary glands make the greatest contribution to whole mouth during: resting (unstimulated) salivary secretion? stimulated salivary secretion? 3.What is a salivary film and what is a salivary pellicle? 4.Which glycoprotein is particularly important in determining the properties of saliva? 5. Which components of saliva are particularly important in maintaining tooth mineralization? Recommended reading for salivary gland lectures Saliva and oral health, 4th Ed., 2012 (3rd. Ed., 2004). Edgar, MW et al. Published by British Dental Journal Saliva and salivary glands, Proctor, GB. Chapter 12 in Basic Sciences for Dental Students (2018), Whawell SA & Lambert DW. John Wiley & Sons Ltd. Our daily saliva whole saliva flow rate Unstimulated (no tasting/ chewing) for 15/24 hours 0.35 ml/min Sleeping for 7/24 hours 0.1 ml/min Stimulated (tasting/ chewing) for 2/24 hours 2.0 ml/min –Total for 24 hr approximately 600 ml –Circadian rhythm over 24hr. From 9am – 5pm could increase unstimulated whole mouth salivary flow by 70% Contribution of different salivary glands to saliva in the mouth Unstim / resting Unstim / resting Stiimulated Stiimulated (ml/min) (%) (ml/min) (%) Whole mouth saliva 0.35 100 2.0 100 Parotid glands 0.1 28 1.05 53 0.24 68 0.92 46