Determining a preparation surface

A method for determining a preparation surface of a tooth for preparing the tooth for receiving a dental restoration element,

• the method comprising:
• receiving a three-dimensional digital tooth model, the three-dimensional digital tooth model being descriptive of a current form and of a position of the tooth to be prepared within a dental situation of a patient;
• adjusting the position of the tooth to be prepared within the three-dimensional digital tooth model to a planned position to be achieved by an orthodontic adjustment of the respective tooth using orthodontic measures;
• receiving a three-dimensional digital restorative tooth model, the three-dimensional digital restorative tooth model defining a preliminary target form of the tooth to be achieved by applying the dental restoration element;
• receiving a definition of a restoration area indicative of a surface area of the three-dimensional digital tooth model of the tooth to be prepared, at which the dental restoration element is to be arranged;
• receiving a first value selected for a basic preparation depth of the preparation to be executed within the restoration area of the three-dimensional digital tooth model of the tooth to be prepared;
• receiving a second value selected for a restoration thickness of the dental restoration element;
• determining a first reference surface using an inward projection of the restoration area of the three-dimensional digital tooth model of the tooth to be prepared into the three-dimensional digital tooth model depending on the first value selected for the basic preparation depth;
• determining a second reference surface using an inward projection of a surface section of the three-dimensional digital restorative tooth model overlapping with the restoration area of the three-dimensional digital tooth model of the tooth to be prepared into the three-dimensional digital restorative tooth model depending on the second value selected for the restoration thickness;
• determining one or more preparation reference surface sections using the first and second reference surface,
• determining the preparation surface for preparing the tooth to be prepared using the determined one or more preparation reference surface sections.

A computer program product for determining a preparation surface of a tooth for preparing the tooth for receiving a dental restoration element,

• the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions being executable by a processor of a computer device to cause the computer device to:
• receive a three-dimensional digital tooth model, the three-dimensional digital tooth model being descriptive of a current form and of a position of the tooth to be prepared within a dental situation of a patient;
• adjusting the position of the tooth to be prepared within the three-dimensional digital tooth model to a planned position to be achieved by an orthodontic adjustment of the respective tooth using orthodontic measures;
• receive a three-dimensional digital restorative tooth model, the three-dimensional digital restorative tooth model defining a preliminary target form of the tooth to be achieved by applying the dental restoration element;
• receive a definition of a restoration area indicative of a surface area of the three-dimensional digital tooth model of the tooth to be prepared, at which the dental restoration element is to be arranged;
• receive a first value selected for a basic preparation depth of the preparation to be executed within the restoration area of the three-dimensional digital tooth model of the tooth to be prepared;
• receive a second value selected for a restoration thickness of the dental restoration element;
• determine a first reference surface using an inward projection of the restoration area of the three-dimensional digital tooth model of the tooth to be prepared into the three-dimensional digital tooth model depending on the first value selected for the basic preparation depth;
• determine a second reference surface using an inward projection of a surface section of the three-dimensional digital restorative tooth model overlapping with the restoration area of the three-dimensional digital tooth model of the tooth to be prepared into the three-dimensional digital restorative tooth model depending on the second value selected for the restoration thickness;
• determine one or more preparation reference surface sections using the first and second reference surface,
• determine the preparation surface for preparing the tooth to be prepared using the determined one or more preparation reference surface sections.

A computer device for determining a preparation surface of a tooth for preparing the tooth for receiving a dental restoration element,

• the computer device comprising a processor and a memory storing program instructions executable by the processor, execution of the program instructions by the processor causing the computer device to:
• receive a three-dimensional digital tooth model, the three-dimensional digital tooth model being descriptive of a current form and of a position of the tooth to be prepared within a dental situation of a patient;
• adjusting the position of the tooth to be prepared within the three-dimensional digital tooth model to a planned position to be achieved by an orthodontic adjustment of the respective tooth using orthodontic measures;
• receive a three-dimensional digital restorative tooth model, the three-dimensional digital restorative tooth model defining a preliminary target form of the tooth to be achieved by applying the dental restoration element;
• receive a definition of a restoration area indicative of a surface area of the three-dimensional digital tooth model of the tooth to be prepared, at which the dental restoration element is to be arranged;
• receive a first value selected for a basic preparation depth of the preparation to be executed within the restoration area of the three-dimensional digital tooth model of the tooth to be prepared;
• receive a second value selected for a restoration thickness of the dental restoration element;
• determine a first reference surface using an inward projection of the restoration area of the three-dimensional digital tooth model of the tooth to be prepared into the three-dimensional digital tooth model depending on the first value selected for the basic preparation depth;
• determine a second reference surface using an inward projection of a surface section of the three-dimensional digital restorative tooth model overlapping with the restoration area of the three-dimensional digital tooth model of the tooth to be prepared into the three-dimensional digital restorative tooth model depending on the second value selected for the restoration thickness;
• determine one or more preparation reference surface sections using the first and second reference surface,
• determine the preparation surface for preparing the tooth to be prepared using the determined one or more preparation reference surface sections.