Arrangement of Artificial Teeth PDF

ARRANGEMENT OF ARTIFICIAL By TEETH Dr. Mohammed A. El-Sawy BDS, MSc, PhD (Mansoura Uni) Lecturer of Prosthetic Dental Science, Faculty of Dentistry, Menoufia Uni A- The carved occlusion rims should provide reliable guides for placement of the teeth. These guides are:...

ARRANGEMENT OF ARTIFICIAL By TEETH Dr. Mohammed A. El-Sawy BDS, MSc, PhD (Mansoura Uni) Lecturer of Prosthetic Dental Science, Faculty of Dentistry, Menoufia Uni A- The carved occlusion rims should provide reliable guides for placement of the teeth. These guides are: 1.guide lines. 2.occlusal plane. 3.lip support. 4.Correct jaw relationships. 1- Guide lines Smile line: The harmony between the curvature of the incisal edges of the maxillary anterior teeth and the upper border of the lower lip.” 2- The proper placement of the occlusal plane. Anterior occlusal plane parallel to the interpupillary line. Posterior occlusal plane parallel to the ala tragus line 3- Proper lip support  4- Correct jaw relationships (vertical dimension of occlusion and centric relation). B-Sequence of arranging the teeth First sequence: The maxillary anterior teeth Mandibular anterior teeth Maxillary posterior teeth Mandibular posterior teeth.  Second sequence The maxillary anterior teeth Mandibular anterior teeth Mandibular posterior teeth Maxillary posterior teeth.  Third sequence: The maxillary anterior teeth Maxillary posterior teeth, Mandibular posterior teeth Mandibular anterior teeth. C-Factors affecting setting of maxillary anterior teeth:  1- Alveolar ridge resorption: From papilla to the labial surface of upper central incisor = 8-10 mm. From labial surface of canine to anterior rugae = 10.5 mm The general pattern of bone loss is upwards and backwards for the maxillar anterior residual ridge and downwards and y lingually for mandibular the anterior residual ridge  Lip support 2- Esthetics Amount of tooth showing -In order to restore the natural appearance, the teeth should be placed to support the lip and muscles of expression. -The teeth should be placed in the position formerly occupied by the natural teeth. -Frequently, there are some irregularities in natural teeth which may be reproduced in complete denture to improve esthetics  Neutral zone philosophy : The neutral-zone is based upon the concept that for each individual patient, there exists within the denture space a specific area where the function of the musculature will not unseat the denture and where forces generated by the tongue are neutralized by the forces generated by the lips and cheeks.  We should not be dogmatic and insist that teeth be placed over the crest of the ridge, buccal or lingual to the ridge. Teeth should be placed as dictated by the musculature, and this will vary for different patients. Positioning artificial teeth in the neutral zone achieves two objectives. First, the teeth will not interfere with the normal muscle function, and second, the forces exerted by the musculature against the dentures are more favorable for stability and retention.  The neutral zone is the stress-free area between the tongue on one side and, on the other side, the mimic muscles, which are responsible for the movement of the lips and cheeks. Moreover, the maxillary posterior artificial teeth and the supporting acrylic surfaces of the maxillary denture have an important function in providing support for the upper lip and cheeks in order to prevent a 'denture look' appearance.  3- Phonetics Speech is affected by 1- The position of the teeth 2- The contour and bulk of the palate. Setting anterior maxillary teeth  General considerations Vertical long axis from Front view Vertical long axis from Side view Occlusal plane  Upper anterior teeth Vertical long axis from front view Vertical long axis from side view Perpendicular Vertical or Slightly Slightly Vertical or cervical Incline to the cervical third is labially labially third is inclined slightly horizontal inclined buccally distally plane buccally  Long axis Long axis Teeth Incisal edge seen from the seen from the front side Maxillary Central Perpendicular to Touch the Slightly labially the horizontal mandibular plane occlusion rim Lateral Incline Raised Slightly labially slightly approximat distally ely 1 mm Vertical or Canine Vertical or Touch the cervical third is inclined mandibular inclined slightly distally occlusion rim buccally  Lower anterior teeth Vertical long axis from front view perpendicular Perpendicular Inclined Slopes Slopes with a slight to the occlusal Inclines lingually distally labially labially distal plane inclination  Teeth Long axis seen Long axis seen Incisal edge from the front from the side Mandibular Central Perpendicular to the Slopes labially 1-1.5 mm horizontal occlusal plane and vertical overlaps Labial inclination is Lateral Inclined distally at less than that of the Same at the central the cervical central incisor incisors Nearly perpendicular to Same occlusal height as the occlusal plane with the mandibular central Canine a slight distal Inclines lingually and lateral incisors inclination  If anatomic posterior teeth are used, 1-1.5 mm horizontal and vertical overlaps are made Thank You