framework design(implants)

post&core

framework designing in implants

pre-ditch & ditch

after preparation of plaster cast,dies should be prepared to continue working,the firs step of prepare dies is determine the type of finishing line on the margin of tooth preparation.

The finished margin position and type are determined by the gingival contour, the nature of the restorative material, the presence or absence of a core margin and the choice of luting agent.Whenever possible, the margin should be supragingival following the natural gingival contours. Finish margins should ideally extend at least 1 mm past core margins to rest on sound tooth tissue

there are the several types of finish margin in prepration tooth:

  Chamfers and shoulders give definite finish margins which may be identified on preparations, temporary crowns and dies. Occasionally, knife-edge preparations may be indicated for full veneer crowns where there are deeply subgingival margins (however, periodontal surgery may be more appropriate here), bulbous teeth or pins close to the preparation margin. Metal ceramic crowns may be constructed with metal collars, especially on long preparations on posterior teeth. Lipline on smiling may indicate whether this is a practical proposition. A chamfer or knifeedge finish may avoid excessive tooth reduction in this situation. 

diagnosis and determine the finish margins and easy access to it on the die is done during the pre-ditch and ditch.there are 2 burrs for pre-ditch and ditch pear shaped burrs and round burrs that you see in images.
pre-ditch:at this stage is removed around the finish margin of gum with a pear-shaped burrs according to the images.
ditch:the following stage finish line is empty with a fine round bur and finishing line is being provided to technician clearly.

Introduction

hello,welcome to "academy dental lab"  .This blog works in the field of fixed prosthodontics laboratory procedures. the specialized field of prosthodontics as other sciences of dentistry,with the extensive research and studies of scientist and specialists in this field,providing control materials and techniques is of great new features,which  specialized books.scientific annual congresses,seminars and practical training for technicians and dentists to improve quality and presentation of new techniques in making prosthodontics used.
blogs in the field of prosthodontics can not only important in order to create and enhance more coordination and understanding between laboratories and clinics but the space can be reasonable to transfer experiences and views in this field.
 we put the images of cases that done in our laboratory and all work procedures of cases in this blog with the issues about those and we wait to view the idea and experiences of technicians and dentists about those.thus the space created and formed to transfer scientific point and experience that is easily accessible from every one.
we would like to send us your the scientific issues and the images from your cases to public with your name or title in this blog to use from it our colleagues.too we will put many books in the field of prosthodontics and implants and the other fields from it for free download,soon.
we try to use from valid scientific references in presentation issues and texts.so i hope this blog can take  though small step in the direction of scientific progress for me and my colleagues but the this obtained with  your presence and comments.
alireza esfandyari
dental technician
tabriz-iran