Morphology of primary teeth
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This document summarizes the key anatomical features of the four permanent molars - the maxillary first molar, mandibular first molar, maxillary second molar, and mandibular second molar. It describes the cusp patterns, pulp horn sizes and locations, root structures, and fossa/pit locations of each tooth. The maxillary first molar has 4-5 cusps, 3-4 pulp horns, and 3 roots. The mandibular first molar has 5 cusps, 5 pulp horns, and 2 divergent roots. The maxillary second molar has 4 cusps, 4 pulp horns, and 2 roots. The mandibular second molar has 4 c
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![By : Osama Ahmad .. Level 8 facebook.com/Os.a7mad ☚Os_a@dr.com
Mandibular1stmolarMandibular2ndmolarMaxillary2ndmolarMaxillary1srmolar
㊂ut line
Trapezoidal coronal
●Cusps
Four ML , MB , DB , DL
may three DL is missing
イPulp horns : Three or Four
MB = 0,8 mm DB = 1.3 - 2.1 mm
Lingual = 1.2 - 2.05 mm
below the cusp
MB horn is the largest➘
Rootsひ
Three slender Roots ,
[ two buccal one palatal ]
divergent then converge at
apices
In MB side there is
Well developed Molar tubercle = zukerkandl
-----------------------------------------------------------------
Groove >>
Central deep development groove between
buccal and lingual half and connect three fossas
Fossa >> Mesial , central , Distal
㊂ut line
Irregular quadrilateral
●Cusps
Four cusps ML , MB , DB , DL
イPulp horns : Four
ML , MB = 3.3 mm , below the cusp
DL , DB = 3.5 mm , below the cusp
Rootsひ
Two flat Roots
Long mesial root
Short distal root
In MB side there is
Well developed Molar tubercle = zukerkandl
-----------------------------------------------------------------
MD width lingually is less than buccally
Two mesial cusps joined by Transverse ridge
Fossa >>
small mesial Fossa , Longer distal fossa
㊂ut line : Rohomboid
replica of
permenant maxillary 1st molar
●Cusps
Four ML , MB , DL , DB
may fifth cusp : Carabelli
イPulp horns : Four or Five
MB = 4 mm , below the cusp
DB = 4.3 mm, below the cusp
MB horn is the largest➘
ひ Roots
Three Roots
Two buccal , one palatal
the largest is palatal
Ridge >>
from ML cusp to DB cusp oblique ridge
Groove >>
Ligual development groove
between B cusps , L cusps
2 Central pit 3 shallow mesial pitPits 1 deep distal pit
㊂ut line : Regular Rectangular
replica of
permenant mandibular 1st molar
●Cusps : Five
3 Buccal cusps ,
2 Lingual cusps equal
イPulp horns : Five
MB = 4 mm , below the cusp
DB = 4.3 mm below the cusp
MB horn is the largest➘
ひ Roots :
Two widely divergent Roots
divergent flat in MD direction
Long mesial root contain 1 or 2 canals
Short distal root contain one canal
2 mesial pit 3 shallow distal pitPits 1 deep central pit](https://image.slidesharecdn.com/morsp-130511085755-phpapp01/85/Morphology-of-primary-teeth-1-320.jpg)
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The document discusses the morphology of primary (deciduous) teeth. It describes the key traits of deciduous teeth crowns and roots compared to permanent teeth. It provides details on eruption times and shedding schedules for each tooth type. Specific traits are outlined for maxillary and mandibular incisors, canines, and first molars, including crown and root features. Primary teeth have thinner layers of enamel and dentin, larger pulp chambers, and shorter, more flaring roots compared to permanent teeth.
Cavity preparation
This document discusses cavity preparation in primary teeth. It covers the basic principles, which involve opening the cavity with a high-speed bur and then eliminating caries from all walls. It describes cavity preparations for different tooth surfaces and classes of cavities. For class I cavities, it recommends rounding internal line angles and converging side walls. For class II cavities, it suggests dovetail-shaped occlusal steps and convergence of proximal walls. Stainless steel crowns are indicated for restoring heavily decayed primary molars.
Difference between Permanent vs deciduous teeth
Primary teeth differ from permanent teeth in several key ways:
- Primary teeth are smaller with more prominent cervical ridges, narrower necks, and lighter color compared to permanent teeth.
- The crowns of primary teeth are wider than their length while primary roots are narrower and longer.
- Primary molar roots are more slender, longer, and flare out more beyond the crowns to allow space for developing permanent teeth.
- Primary teeth have thinner enamel, larger pulp chambers and horns, and more pronounced cervical ridges than permanent teeth.
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This document provides an overview of dentin, including:
- A brief history of discoveries related to dentin structure.
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- The physical properties, chemical composition, and structural components of dentin including dentinal tubules, predentin, peritubular and intertubular dentin.
- Features such as von Ebner's lines, lines of Schreger, and contour lines of Owen which represent incremental growth patterns in dentin.
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The document discusses the phases of tooth eruption and theories of tooth eruption. It describes three phases of tooth eruption: 1) the preeruptive phase where the tooth germ moves within the jaw bone, 2) the eruptive or prefunctional phase where the root forms and the tooth emerges into the mouth, and 3) the functional or post-eruptive phase where the tooth reaches the bite and the roots continue to develop. Several theories for the mechanism of tooth eruption are mentioned, including the roles of vascularity, pressure changes, root formation, bone remodeling, the dental follicle, and the periodontal ligament.
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This document discusses the stages of odontogenesis, or tooth development. It describes the five main stages of growth: initiation, proliferation, histodifferentiation, morphodifferentiation, and apposition. Key structures that form during these stages include the dental lamina, dental sac, dental organ comprising the inner and outer dental epithelium and stellate reticulum, and the dental papilla. Cells in these structures differentiate into formative cells that build the tooth structures, such as ameloblasts forming enamel and odontoblasts forming dentin. The shape of the tooth crown is determined during morphodifferentiation by the membrana preformativa.
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Pulpectomy is a dental procedure to remove infected or dead pulp from the root canals of primary teeth. It aims to maintain the tooth in a non-infected state by cleaning and filling the root canals. A partial pulpectomy removes pulp from a single visit, while a complete pulpectomy is done over two visits with emergency treatment followed by root canal filling. Common filling materials for primary teeth include zinc oxide eugenol paste and iodoform paste, which resorb at a rate similar to the tooth root. The procedure involves local anesthesia, access through the crown, pulp removal, canal cleaning and shaping, irrigation, drying and obturation.
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This document discusses stainless steel crowns, including different types, their objectives and uses, composition, indications, clinical procedure, modifications, and complications. There are three main types of stainless steel crowns - untrimmed, pretrimmed, and precontoured. Stainless steel crowns are used to restore primary and young permanent teeth with extensive decay or other defects. The clinical procedure involves tooth preparation, initial crown adaptation, contouring, crimping, and cementation. Complications can include ledges, crown tilt, or poor margins.
Oral Histology "tooth development"
1. The document describes the morphological stages of tooth development from the dental lamina stage through the bell stage.
2. It explains the histological changes that occur in each stage, including the differentiation of cells in the enamel organ and dental papilla.
3. Root formation begins after enamel and dentin deposition reaches the cemento-enamel junction, guided by the epithelial root sheath of Hertwig.
Stainless steel crowns in Pediatric Dentistry
A crown is a tooth shaped covering which is cemented to the tooth structure & its main function is to protect the tooth structure & retain the function
Morphology of tooth
This document discusses the morphology of primary (deciduous) teeth. It provides background information on primary teeth and their importance. It then describes the morphology of each individual primary tooth, including their dimensions, root shape, pulp cavity shape, and features seen from different aspects. The teeth described include the maxillary and mandibular incisors, canines, and first molars.
Enamel pearl
An enamel pearl, or enameloma, is a small white mass of ectopic enamel attached to a root surface near the cementoenamel junction (CEJ). It can contain enamel, dentin, and pulp. Enamel pearls are caused by the persistence of Hertwig's epithelial root sheath during root development, allowing it to form enamel. They range in size from 0.3 to 4 mm and commonly form on the maxillary and mandibular molars. Enamel pearls promote plaque retention and provide a niche for bacteria, which can lead to periodontal problems if left untreated.
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This document provides detailed information about the anatomy and morphology of the permanent maxillary first molar tooth. It describes the general features including that there are 12 molars total, they are the largest teeth without deciduous predecessors, and are multi-rooted. Specific details are then given about the surfaces, roots, chronology of development, and anatomical landmarks of each surface including elevations and depressions. Comparisons are made between the maxillary first and second molars, noting differences in their occlusal outlines, root structures, and morphological features.
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This document provides detailed information about the mandibular first permanent molar tooth. It describes the tooth's number, eruption date, function, number of surfaces and roots. It examines the tooth's anatomy in detail, including the geometric outline and anatomical landmarks of each surface - buccal, lingual, mesial, distal and occlusal. It discusses the tooth's root trunk, roots, pulp chamber and root canals. The document also provides information about abnormalities that may be found and labels the different surfaces and anatomical features.
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This document describes the anatomy and characteristics of the maxillary first molar tooth. It discusses the chronology of development, geometric outline of the crown from different aspects, outlines and surface anatomy of the crown and roots. Key points include that it has 5 surfaces, 3 roots, and a trapezoidal crown outline. The mesiolingual cusp is the largest cusp and there may or may not be a Carabelli cusp present. The occlusal surface has 2 major fossae, 2 minor fossae, and 5 developmental grooves. The mesial aspect has a nearly straight outline and flat surface.
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This document describes the anatomy and features of the first permanent molar (tooth #6). It has 5 surfaces, 2 roots, and a trapezoidal outline. It is known as the "six year molar" because it begins calcifying and erupting around age 6. Key features include its mesial and distal roots, concave mesial and distal outlines, buccal and lingual cusps separated by developmental grooves, and a rectangular pulp chamber with 3 root canals.
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This document provides detailed anatomical information about the first permanent molar tooth. It describes the tooth's 5 surfaces, 2 roots, occlusal landmarks, and root canal anatomy. Key details include that it has 5 surfaces, erupts at age 6, and functions as the "key of occlusion". The roots are twice as long as the crown and inclined distally. The occlusal surface has 5 cusps separated by developmental grooves.
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Obama and his family moved to Washington D.C. after he was elected President in 2008. The document then provides detailed anatomical descriptions of the premolars, including their number, shape, features, eruption timeline, and relations to other teeth. It describes the maxillary and mandibular first and second premolars, discussing differences between them. Diagrams illustrate aspects of the premolars like occlusal outlines, root structures, and pulp cavities.
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Film vocab for eal 3 students: Australia the movie
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The simplified electron and muon model, Oscillating Spacetime: The Foundation...
The simplified electron and muon model, Oscillating Spacetime: The Foundation...
Morphology of primary teeth
- 1. By : Osama Ahmad .. Level 8 facebook.com/Os.a7mad ☚Os_a@dr.com Mandibular1stmolarMandibular2ndmolarMaxillary2ndmolarMaxillary1srmolar ㊂ut line Trapezoidal coronal ●Cusps Four ML , MB , DB , DL may three DL is missing イPulp horns : Three or Four MB = 0,8 mm DB = 1.3 - 2.1 mm Lingual = 1.2 - 2.05 mm below the cusp MB horn is the largest➘ Rootsひ Three slender Roots , [ two buccal one palatal ] divergent then converge at apices In MB side there is Well developed Molar tubercle = zukerkandl ----------------------------------------------------------------- Groove >> Central deep development groove between buccal and lingual half and connect three fossas Fossa >> Mesial , central , Distal ㊂ut line Irregular quadrilateral ●Cusps Four cusps ML , MB , DB , DL イPulp horns : Four ML , MB = 3.3 mm , below the cusp DL , DB = 3.5 mm , below the cusp Rootsひ Two flat Roots Long mesial root Short distal root In MB side there is Well developed Molar tubercle = zukerkandl ----------------------------------------------------------------- MD width lingually is less than buccally Two mesial cusps joined by Transverse ridge Fossa >> small mesial Fossa , Longer distal fossa ㊂ut line : Rohomboid replica of permenant maxillary 1st molar ●Cusps Four ML , MB , DL , DB may fifth cusp : Carabelli イPulp horns : Four or Five MB = 4 mm , below the cusp DB = 4.3 mm, below the cusp MB horn is the largest➘ ひ Roots Three Roots Two buccal , one palatal the largest is palatal Ridge >> from ML cusp to DB cusp oblique ridge Groove >> Ligual development groove between B cusps , L cusps 2 Central pit 3 shallow mesial pitPits 1 deep distal pit ㊂ut line : Regular Rectangular replica of permenant mandibular 1st molar ●Cusps : Five 3 Buccal cusps , 2 Lingual cusps equal イPulp horns : Five MB = 4 mm , below the cusp DB = 4.3 mm below the cusp MB horn is the largest➘ ひ Roots : Two widely divergent Roots divergent flat in MD direction Long mesial root contain 1 or 2 canals Short distal root contain one canal 2 mesial pit 3 shallow distal pitPits 1 deep central pit