Dentistry – Orthodontics – Tool
Patent
1997-02-27
1998-08-11
Wilson, John J.
Dentistry
Orthodontics
Tool
433 24, A61C 300
Patent
active
057918961
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for providing a dental aid on at least one tooth of at least one row of teeth, which apparatus comprises a mold containing the impression of at least a portion of a number of teeth from a row.
Such an apparatus is known from U.S. Pat. No. 3,738,005. For manufacturing this known apparatus, the dental aids, in this case a number of brackets, are temporarily bonded at the desired locations on a model of the row of teeth, whereupon the mold is formed on this model with aids. When the finished mold is removed, the temporary bond of the brackets comes loose, as a result of which the brackets are left in the mold. After the brackets have been provided with a bonding agent, the mold is placed over the row of teeth and held in this position until the bonding agent has cured and the brackets are thus fixed on the row of teeth. After removal of the mold, leaving the brackets behind, the wire or brace desired for a dental treatment can be arranged through the brackets.
The advantage of employing such an apparatus is that the proper position of the brackets can be determined and fixed outside the patient's mouth and even in his absence, while the positioning of the brackets on the row of teeth takes place in a quick and accurately determined manner. However, this manner of operating may give rise to problems, because when the mold with brackets provided with bonding agent is slid onto the row of teeth, bonding agent will be scraped from these brackets and spread across the tooth. Even more disadvantageous, however, is the fact that due or not due to scraping, air bubbles become enclosed between the bonding agent and the tooth, become enclosed air bubbles may cause dental carries, which, however, only appears when, in the course of time, the brackets are removed.
U.S. Pat. No. 4,183,141 discloses a method and an apparatus for providing a number of aids on a number of teeth of a set of teeth. According to the known method, a cast is made of a set of teeth, in a known manner, first in negative and then in positive. Then, the different teeth are out loose from the positive cast made and placed in a soft plastic medium such as wax, while they are positioned in an ideal position. This means that the loose teeth are placed in the positions which, in the opinion of the dentist, orthodontist, patient or dental technician, the teeth would have to assume after use of the brace to be formed with the brackets. The thus formed idealized model of the set of teeth is accurately disposed on a table so that the whole is plane within a curved supporting block slightly spaced therefrom. On the supporting block, a number of guide blocks are placed, corresponding to the desired number of brackets, in such a manner that a fastening lip extends above the relevant tooth while a guide passage extends at a desired height and at a desired angle relative to the tooth face on which the bracket is to be provided. Over the teeth a synthetic mold is formed wherein impressions of the upper edges of the different teeth will be made and wherein the fastening lips are fixedly received. The mold is out into sections, each section carrying one guide block. The sections of the mold are then positioned, one by one, on the relevant tooth in the set of teeth to be treated. Then, on an end of a sliding element that is slideable in the guide passage, a bracket is mounted having its base surface facing the tooth face, and next each bracket is provided with cement and placed on the relevant tooth by pressing the sliding element.
An apparatus manufactured according to this known method consists of a series of parts of a mold, each part carrying a guide part. Each part can separately be placed on the relevant tooth irrespective of the position of the tooth at the moment of placing. This enables the apparatus to be reused for the relevant patient, for instance for repositioning a bracket that has come loose during use. However, this known method has the drawback that the teeth have to be cut loose from the model and repositioned i
REFERENCES:
patent: 2311158 (1943-02-01), Conway et al.
patent: 3738005 (1973-06-01), Cohen et al.
patent: 3787976 (1974-01-01), Cohen
patent: 4183141 (1980-01-01), Dellinger et al.
patent: 4224710 (1980-09-01), Solow
patent: 5055038 (1991-10-01), Ronay et al.
Aptus B.V.
Wilson John J.
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