Lecture 06- SELECTION OF ARTIFICIAL TEETH PDF Dental Lecture

ARTIFACIAL TEETH SELCTION DR, Sara Zaky Mohamed Associate professor of Prosthodontics Goals of artificial teeth selection Function Speak Esthetics Preservation of the ridge  Selection of anterior & posterior The anterior teeth are satisfy esthetic requirements. The posterior te...

ARTIFACIAL TEETH SELCTION DR, Sara Zaky Mohamed Associate professor of Prosthodontics Goals of artificial teeth selection Function Speak Esthetics Preservation of the ridge  Selection of anterior & posterior The anterior teeth are satisfy esthetic requirements. The posterior teeth are satisfy masticatory functional requirements. There is no single rule to decide the selection, it certainly requires A. Artistic skill in addition to B. Scientific knowledge  Selection of Anterior Teeth Selection of anterior teeth Size Form (shape ) Shade Guides for selection of anterior teeth size pre-extraction records A- diagnostic casts B- photographs C- radiograph D-Extracted teeth E- previous denture  4- Pre-extraction Records a- Facial photographs: By comparing, clearly visible factors like interpupillary distance of patient in photo and in person with the tooth width in photo, the actual width of the anterior tooth can be calculated. 𝑰𝒏𝒕𝒆𝒓𝒑𝒖𝒑𝒊𝒍𝒍𝒂𝒓𝒚 𝒅𝒊𝒔𝒕𝒂𝒏𝒄𝒆 𝒐𝒇 𝒑𝒂𝒕𝒊𝒆𝒏𝒕 𝑨𝒄𝒕𝒖𝒂𝒍 𝑻𝒐𝒐𝒕𝒉 𝒘𝒊𝒅𝒕𝒉 = 𝑰𝒏𝒕𝒆𝒓𝒑𝒖𝒑𝒊𝒍𝒍𝒂𝒓𝒚 𝒅𝒊𝒔𝒕𝒂𝒏𝒄𝒆 𝒐𝒇 𝒑𝒉𝒐𝒕𝒐 𝑻𝒐𝒐𝒕𝒉 𝒘𝒊𝒅𝒕𝒉 𝒊𝒏 𝒑𝒉𝒐𝒕𝒐 b- Diagnostic casts help in selecting the width of the anterior teeth. Post extraction records Extra oral factors intra oral factors Size of the face size of arch The lips incisive papilla Nose width vertical distance between arch Maxillo mandibular relation The average width of the maxillary central 𝐛𝐢𝐳𝐲𝐠𝐨𝐦𝐚𝐭𝐢𝐜 𝐰𝐢𝐝𝐭𝐡 incisor is = 𝟏𝟔  The contour of the residual ridge Artificial teeth should follow the contour of the residual ridges that existed when natural tooth were present As reseorption occurs there is alteration in the contour of the ridge Vertical distance between ridges The length of the teeth is determined by the available space between the existing ridges It is advisable to use a tooth long to eliminate the display of the denture base The lips Labial surface supports the relaxed lip Incisal edges extends inferior to or slightly below the lip margin Labial incisal third of the maxillary anterior teeth superior border of the lower lip in speech Incisal edges of maxillary an teeth junction of he moist and dry surfaces of the vermillion border Width of the nose Boucher and Hoffman referred to nasal index as = width of anterior teeth from the center to center of the canines  Shape (form): The form or shape of the anterior teeth is selected according to: 1. Form and contour of face Frontal Profile 2. The shape of maxillary arch 3. Dentogenic concept 4. Pre-extraction Records Form of the teeth Facial profile  The shape of maxillary arch If the upper model when viewed from the occlusal surface, presents a Tapering arch form, then a tapering tooth may be indicated, Square arch indicates, square teeth and so on. Sex Male sharp edge Female round edge  Age With age The teeth wear at the incisal edges and interproximal surfaces. Labial surfaces seem flatter. Form appear squarer. The same should be considered while selecting the teeth.  Personality A vigorous personality requires square teeth with flat incisal edges, A delicate personality will require ovoid teeth. shade (color) of teeth  Shade (Color) a- The complexion: The color of artificial teeth is selected according to color of the face and eyes. Light teeth are used for white peoples and blue or green eyes. Dark teeth are indicated for dark skin and eyes.  The color of the hair Is a very unreliable guide for tooth color selection, as the patient could be dyeing the same.  b- The age and sex: The older the patient the darker will be the shade required. Also, men will usually require a darker shade than women.  A shade guide Is used in tooth color selection. It consists of a number of shades graduated from a very light to a dark yellow or grey. The color is observed with the skin and under the lip with incisal edge exposed.  Reddish Brown (A) Reddish Yellow (B) Gray (C) Shade guide Reddish Grey (D) Selection of posterior teeth Forms of posterior teeth 1- anatomic 2- semi anatomic 3- flat teeth Cusp Angle Used in Masticatory efficiency Aesthetics Horizontal force Stability A B C Anatomic teeth Anatomic Teeth (30°, 40°) Use for patients with: – Esthetic concerns – Coordinated jaw movements – Denture opposing natural teeth Non anatomic Non-Anatomic Teeth (0°, Rational, Monoline, etc. ) Jaw size discrepancies (Class III) Severe ridge resorption Uncoordinated jaw movements Poorer esthetics, due to lack of cuspal inclines The semi-anatomic teeth Have low cusp (20 degree) and have the same anatomic carvings of anatomic teeth. The semi-anatomic teeth Indications: Used in well-formed and low rounded residual alveolar ridges. Advantages Shallow cuspal inclination will generate less horizontal forces compared to anatomic teeth. Disadvantages: 1- Aesthetics is less compared to anatomic teeth. 2- Chewing efficiency is less compared to anatomic teeth. II- Size of posterior denture teeth A- Length: B- The mesiodistal width: C- The buccolingual width:  A- Length This is determined by the amount of denture space available between the upper and lower ridges.  B- The mesiodistal width: Tuberosity in the maxillary From distal aspect of the denture, canine Retromolar periphery of the lower denture C- The buccolingual width: The teeth with a narrow buccolingual width are selected to reduce the occlusal table and consequently the load falling on the ridge. However, this reduction in width should not be accomplished at the expense of losing support for the cheek.  3- Shade (color): The shade of the posterior teeth should harmonize with that of the anterior teeth.  THANK YOU For any questions feel free to contact me by mail [email protected]