A butterfly attachment to guide a clear aligner to grip a tooth. The butterfly attachment is formed by two substantially quarter sphere units, wherein each unit has a convex surface and a concave surface. The two units are merged at their convex edge mid portions, such that the convex surfaces are continuous and forms a front face resembling a valley shape. The rear face of the butterfly attachment formed by the concave surfaces is also continuous and concave that corresponds to contours of the tooth.

In some embodiments, apparatuses and methods are provided herein useful to orthodontics. In some embodiments, an orthodontic appliance comprises a body, wherein the body comprises a bonding surface, wherein the bonding surface is configured to be bonded to a surface of a patient’s tooth, a facial surface including an insertion opening, and a compound archwire slot, wherein the compound archwire slot includes an insertion portion and a retention portion, wherein the insertion portion extends into the body from the insertion opening, wherein the retention portion is formed within the body, and wherein the retention portion is angled relative to the insertion opening.

A custom tool for bonding orthodontic appliances in a mouth of a patient, the custom tool comprising: a facial body for a patient-specific, customized fit with the facial side of a plurality of teeth of the patient, a lingual body for a patient-specific, customized fit with the lingual side of the plurality of the teeth of the patient, wherein the lingual body. wherein the facial body and lingual body are configured to combine with the teeth of the patient to position orthodontic appliances on the plurality of teeth.

An orthodontic bracket has at least one base configured for attachment to a tooth surface and at least one bracket element arranged at one side of the at least one base, the at least one bracket element comprising—at least one arch wire slot—two wall portions wherein the orthodontic bracket comprises at least one one-piece covering door having at least one first free end which is shaped to fit within at least one indentation of a first wall portion. The at least one indentation comprises at least one locking elevation and the at least one covering door comprises at least one locking deepening. The at least one bracket element and/or the at least one base comprises composite material such as polyurethane material, and/or the at least one covering door comprises composite material such as polyurethane material, and/or comprises ceramic material.

A method for dental treatment may include receiving a plurality of images of a patient's dentition, identifying, from the plurality of images, individual teeth of the patient's dentition, detecting, from the plurality of images, one or more attachments on the patient's dentition, assigning, based on each of the plurality of images, each of the one or more attachments to one of the individual teeth in each image, and combining the assignments of each of the plurality of images for attachment detection results.

In some embodiments, apparatuses and methods are provided herein useful to orthodontic kits. In some embodiments, an orthodontic kit comprises a carrier, wherein the carrier is configured to house a plurality of orthodontic appliances, the plurality of orthodontic appliances, and a plurality of support structures, wherein the plurality of support structures includes groups of support structures, wherein each group of support structures connects one of the plurality of orthodontic appliances to the carrier, wherein the orthodontic kit is defined by a computer data file, wherein the computer data file includes data necessary to additively manufacture the orthodontic kit including the carrier, the plurality of orthodontic appliances, and the plurality of support structures.

Systems for fabricating dental appliances are provided. In some embodiments, a system comprising one or more processors, and a memory operably coupled to the one or more processors and storing instructions that, when executed by the one or more processors, cause the system to determine an appliance geometry for a dental appliance including a shell configured to move the patient's teeth from an initial arrangement toward a target arrangement. The appliance geometry can include a first power arm having a first connection point for connecting to the shell, a second power arm having a second connection point for connecting to the shell or to a tooth, an elongate connecting structure coupled to the first and second power arms, and an elongate counter-force connector coupled to the first power arm and extending toward the second power arm.

Systems for fabricating dental appliances are provided. In some embodiments, a system comprising one or more processors, and a memory operably coupled to the one or more processors and storing instructions that, when executed by the one or more processors, cause the system to determine an appliance geometry for a dental appliance including a shell configured to move the patient's teeth from an initial arrangement toward a target arrangement. The appliance geometry can include a first power arm having a first connection point for connecting to the shell, a second power arm having a second connection point for connecting to the shell or to a tooth, an elongate connecting structure coupled to the first and second power arms, and an elongate counter-force connector coupled to the first power arm and extending toward the second power arm.

Methods and systems for digitally designing a plurality of aligners are provided. In some embodiments, a method includes receiving an intraoral scan of the patient's teeth, and generating 3D dental model of the patient's teeth using the intraoral scan. The method can include identifying a movement path to move the patient's teeth from an initial arrangement toward a target arrangement through a plurality of intermediate arrangements in accordance with a treatment plan. The method can also include identifying one or more appliance features of at least one aligner, the one or more appliance features including one or more feature regions having one or more feature thicknesses. The method can further include instructing an additive manufacturing machine to directly fabricate the at least one aligner in a layer-by-layer fashion.

Methods and systems for digitally designing a plurality of aligners are provided. In some embodiments, a method includes receiving an intraoral scan of the patient's teeth, and generating 3D dental model of the patient's teeth using the intraoral scan. The method can include identifying a movement path to move the patient's teeth from an initial arrangement toward a target arrangement through a plurality of intermediate arrangements in accordance with a treatment plan. The method can also include identifying one or more appliance features of at least one aligner, the one or more appliance features including one or more feature regions having one or more feature thicknesses. The method can further include instructing an additive manufacturing machine to directly fabricate the at least one aligner in a layer-by-layer fashion.