Orthodontic adhesives

a technology for orthodontic adhesives and adhesives, applied in dental surgery, impression caps, teeth capping, etc., can solve the problems of poor molecular weight growth, affecting the success of the bonding process, and the bracket may remain under high intensity lighting for several minutes, so as to facilitate the successful completion

Inactive Publication Date: 2008-11-20
ORMCO CORP
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0008]To achieve the foregoing objects, and in accordance with the present invention, orthodontic adhesive compositions having W/C ratios of at least 10, 12, 14 and even 20 and higher have been developed. The orthodontic adhesive compositions include a curable resin monomer component, a curing initiator system and filler. Also in accordance with the present invention are orthodontic adhesives, which include a curable resin monomer component, a quaternary curing initiator system and fille

Problems solved by technology

In that case, some brackets may remain under high intensity lighting for several minutes.
When the clinician does get to final bracket positioning, there is a high probability that the adhesive on some brackets may be long past viable working time and at risk of tearing, void formation, or other polymerization interruption that would result in poor molecular weight growth leading to compromised bond strength.
In the worst case, the bracket(s) is rigidly fixed such that final re-positioning is not possible, in which case the entire procedure must be re-started.
Compromised bond strength may manifest itself in initial bond failure often before the patient eve

Method used

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Embodiment Construction

[0032]The compositions of the present invention have the unique combination of long working times and fast cure times, which results in W / C ratios superior to those of currently-available orthodontic adhesives.

[0033]Conventional, state-of-the-art light-cured orthodontic adhesives (dental composites) typically have a working time of about 50 seconds and a cure time of about 20 seconds. The compositions of the present invention may extend the working time up to about 70-100 seconds, under typical examination lighting conditions, and may reduce the cure time to about 5 seconds. Thus, whereas the W / C ratio of current market materials is about 2.5 (and in some instances up to about 8), the W / C ratio of compositions of the invention are at least 10 and may range from about 14-20, or higher. This highly desirable improvement is important for reducing bond failures, as it allows the practitioner to carefully adjust bracket (or other orthodontic appliance) placement under bright ambient ligh...

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Abstract

An orthodontic adhesive includes a curable resin monomer component; a quaternary curing initiator system; and filler. Another orthodontic adhesive having a W/C ratio (working time to curing time ratio) of at least 10, 12, 14 or 20, includes a curable resin monomer component; a curing initiator system; and filler. The adhesives are suitable as light-curing and may include a colorant. Suitable colorants include reversible, thermochromic dyes. The adhesive may also include a resin toughening component.

Description

FIELD OF THE INVENTION[0001]The present invention relates to orthodontic adhesives and, in particular, to orthodontic adhesives having extended or increased working times and / or shortened or reduced curing times, resulting in improved work / cure (W / C) ratios. The term “orthodontic” as used herein is intended to include “dental” applications as well as orthodontic applications.BACKGROUND OF THE INVENTION[0002]Bonding orthodontic appliances (e.g., brackets) onto a patient's teeth requires an adhesive. Light-curable adhesives are most popular due to their single-component nature (i.e., no mixing). As will be appreciated, it is important to bond brackets or other attachments with a high bonding integrity as that translates to the durability and longevity of the bond. Two significant factors in attaining high bonding integrity are long working time and a quick, high-strength cure.[0003]Long working time is essential to accommodate typical clinical dynamics. For example, for direct bonding...

Claims

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Application Information

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IPC IPC(8): A61C5/00A61K6/893
CPCA61K6/0023A61K6/0052A61K6/0064A61K6/09A61K6/083C08L75/16A61K6/68A61K6/62A61K6/893A61K6/30A61K6/887
Inventor WONG, RAYMOND F.CORCORAN, KEVIN SEAN
Owner ORMCO CORP
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