Category: WIKI
CROWN FRACTURES : Biologic Consequences & Treatment
CROWN FRACTURES : Biologic Consequences & Treatment CROWN FRACTURES As mentioned previously, the primary aim from an endodontic point of view is to maintain vitality after these types of accidents. Crown infraction (“incomplete fracture or crack of enamel without loss of tooth structure) and uncomplicated crown fracture (“fracture of the enamel only or enamel and [...]
Retention component of removable orthodontic appliance
Retention component of removable orthodontic appliance The retention component maintains the appliance in the mouth, and it is generally advisable to have the clasps located to optimise retention. The following components are commonly used. Adams’ clasp Fixation is achieved by the arrowheads, which engage about 1 mm of the mesial and distal undercuts on the [...] Active components of removable orthodontic appliance
Active components of removable orthodontic appliance Springs The force (F) delivered by a spring is expressed by the formula F adr4//3, where d is the deflection of the spring, r is the radius of the wire and / is the length of the spring. Radius and wire length, therefore, have most effect on wire stiffness. [...]
Indications for removable appliance therapy
Indications for removable appliance therapy The role of removable appliances in the contemporary management of malocclusion is much more restrictive than it has been in the past principally because of the more widespread use of fixed appliances and a greater awareness of the limitations of removable appliances. Removable appliances are best used in the following [...]
Important points that should be remembered in relation to appliance design
Designing a removable appliance Some important points should be remembered in relation to appliance design: • always design the appliance with the patient in the dental chair; this helps to avoid design errors • keep the design as simple as possible: aim to carry out a few tooth movements with each appliance • use the [...]
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