logging in or signing up Plaque Induced Gingivitis Aggravated with local Factors dweena Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 115 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: March 14, 2013 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Plaque Induced Gingivitis Aggravated with local Factors: Plaque Induced Gingivitis Aggravated with local Factors )Chapter 10 (10 th ed. Chapter 22 (11 th ed.)PowerPoint Presentation: The primary cause of periodontal disease is bacterial plaque, along with other predisposing factors. Predisposing factors include calculus, malocclusion, faulty restorations, complications associated withorthodontic therapy, self induced injuries, tobacco and radiation therapyI Calculus: I Calculus Mineralized bacterial plaque that forms on natural teeth and restorations Calculus is divided to : Supragingival Subgingival Calculus: CalculusPrevalence: Prevalence Anerud et. Al.,1991 study Comparison between Sri Lankan tea labors and Norwegian academicians for 15 years … .Develop calculus shortly after teeth eruption Maximum calculus at 25-30 years … .80% showed calculus only on lingual surfaces of lower teeth and buccal surfaces of upper teeth with no longer progressionComposition: Composition Inorganic content: 39% calcium 19% phosphorus 1.9% carbon dioxide 0.8 % magnesium Crystals of: Hydroxyappatite:58% Magnesium White Lockite 21% Octacalsium phosphate 12% Brushite 9%Organic Contents: Organic Contents 1.9-9.1% carbohydrates: galactose, glucose,.. 5.9-8.2% proteins: amino acids 0.2% natural fates: free fatty acidsAttachment to Tooth Surface: Attachment to Tooth Surface 1- By organic pelliclePowerPoint Presentation: 2- Mechanical locking into surface irregularitiesPowerPoint Presentation: 3- Close adaptation of calculus to gently sloping mounds of untreated cementumPowerPoint Presentation: 4-Penetration of calculus bacteria into cementum ( not acknowledged by all investigations)Formation of Cementum: Formation of Cementum 1- Mineralization theory: a) Increase in pH due to loss of CO2 & ammonia produced by bacteria b) Colloid proteins in saliva binds calcium and phosphate c) Phosphatase liberated from plaque bacteria precipitate calcium phosphatePowerPoint Presentation: 2- Seeding agents induce small foci of calcification that enlarge and coalesce to form a calcified mass( epitactic concept, heterogeneous nucleation) The seeding agent is suspected to be intracellular matrix of bacteriaRole of bacteria: Role of bacteria plaque mineralization start extracellular Some bacteria have liability to form intracellular apatite crystals (diphtheroids & veillonella) Bacteria form phosphatases, change pH leading to mineralization Correlation between plaque and gingivitis is more strong than that between calculus and nacteriaEtiologic Significance: Etiologic Significance The non mineralized surface of calculus is the main irritantMateria Alba, Food debris and Stains: Materia Alba, Food debris and Stains Materia alba: bacteria, desquamated cells, leukocytes that lacks regular pattern Yellowish to grayish whit, sticky but less adheranteStains: StainsII Iatrogenic Factors: II Iatrogenic Factors 1- Margins of restorations Position of restorations: Supragingival, gingival and subgingival Roughness of subgingival margins may be caused by:PowerPoint Presentation: 1- Grooves and scratches in surface of restorations 2- Separation of restoration margin and luting material 3- Dissolution of luting material 4- Inadequate margin fitOverhanging margins of restorations: Overhanging margins of restorationsOver contoured margins of restorations: Over contoured margins of restorationsPoor fitting restorations: Poor fitting restorationsMarginal leakage: Marginal leakageOrthodontic appliance: Orthodontic applianceTrauma: TraumaTrauma: TraumaChemical burn: Chemical burnInjurious dental material: Injurious dental materialTobacco chewing: Tobacco chewingAnatomic Variations: Anatomic VariationsReadings: Readings Carranza's Clinical Periodontology !0 th edition : Chapter 10 : 270-280 11 th edition: Chapter You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.