News Column

Patent Issued for Angled Dental Platform Assembly and Methods

June 18, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Grant, James C. (Colorado Springs, CO); Renehan, Bradley (Colorado Springs, CO), filed on November 16, 2011, was published online on June 3, 2014.

The patent's assignee for patent number 8740616 is Grant Dental Technology (Colorado Springs, CO).

News editors obtained the following quote from the background information supplied by the inventors: "Implants are popular means of replacing a lost tooth. Due to their relatively low maintenance and durability people often prefer implants to bridges. Nevertheless, there is a largely undocumented body of complaints voiced to front line dentists about implants, by their patients. These complaints generally are about food impacting and accumulating around and beneath the crown portion of the implant in the enlarged periodontal gap between the implant and the adjacent teeth."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "The invention describes various dental implant systems as well as methods for securing such systems within a patient's jaw. According to one embodiment, a method for securing a dental implant system to a patient's jawbone proceeds by removing a portion of the patient's gum at a treatment site sufficient to expose the patient's jawbone. Also, a portion of the patient's jawbone is removed at the treatment site to form a recess. The recess tapers downward in a direction from lingual to buccal or from buccal to lingual. A base member is positioned at the treatment site such that the base member is embedded within the recess. The base member has a top defined by an outer periphery, a bottom, a buccal side, a lingual side, and a tapered central opening. The lingual side or the buccal side is longer than the other depending on how the recess in the patient's jawbone tapers. The base member is positioned such that buccal side is buccal on the jawbone and the lingual side is lingual on the jawbone. Also, a drill bit is placed through the central opening and a hole is drilled in the jawbone. An implant screw is inserted through the central opening. The implant screw has a head with a tapered section and a threaded end. The implant screw is turned to secure the threaded end within the hole in the jawbone and to seat the head of the implant screw within the tapered opening of the base member.

"In one specific aspect, the top has a planar top surface that is disposed at an angle relative to a planar bottom surface of the bottom. The angle of the top surface relative to the bottom surface serves to raise the buccal side of the base member relative to the lingual side of the base member (or vice versa) when the base member is secured within the recess. Typically, the top of the base member is positioned so as to be generally flush with the patient's jawbone.

"In another aspect, an abutment is placed onto the top surface of the base member. The abutment has a buccal side and a lingual side, and one of the lingual side and the buccal side is longer than the other. Further, the lingual side of the abutment is aligned with the lingual side of the base member. The abutment may be non-rotatably mounted to the base member in a variety of ways. As one specific example, the top of the base member may include at least one recess where a locating pin is placed. The pin is also placed into a corresponding recess on the abutment.

"In a further aspect, the implant screw includes a threaded hole for receiving a capture screw. Also, a healing cover may be placed onto the base member and the patient's gun sutured over the healing cover. The healing cover extends to the outer perimeter of the base member. After time, the healing cover is removed from the base member and an abutment is attached to the base using a capture screw that extends through the abutment and into the implant screw. Further, a crown may be to the abutment.

"In another embodiment, the invention provides a dental implant system that comprises a base member that is adapted to be embedded within a patient's jawbone at a treatment site. The base member has a generally flat top defining an outer periphery, a buccal side, a lingual side, a bottom, and a central opening. The base member is configured to be positioned within a recess in the patient's jawbone, and one of the lingual side and the buccal side is longer than the other depending on the state of the jawbone at the treatment site. The system further includes an implant screw comprising a head and a threaded end. The threaded end is adapted to pass through the central opening of the base member and into the patient's jawbone. The head is adapted to be seated within the central opening of the base member after the threaded end is screwed into the patient's jawbone. Further, the implant screw defines a threaded opening in the head. The system also includes an abutment that is configured to be placed onto the top of the base member. The abutment has a bottom surface that is configured to be positioned adjacent the base member, and a shaped upper surface that is adapted to receive a crown.

"In one aspect, the abutment has a buccal side and a lingual side, and one of the lingual side and the buccal side is longer than the other. The abutment may also have a flat upper portion, and a flat bottom surface is disposed at an angle relative to the flat upper portion.

"In some cases, the top of the base member has a planar top surface that is disposed at an angle relative to a planar bottom surface of the bottom. The angle of the planar top surface relative to the planar bottom surface of the bottom side is in the range from about 5 degrees to about 20 degrees. Further, the bottom of the abutment may have an outer perimeter that generally matches the outer periphery of the base member.

"In one optional aspect, the system further includes a through hole extending longitudinally through the abutment. A locating member extends from the through hole of the abutment and into the head of the implant screw. At least one alignment feature is configured to align the base member with the abutment. Further, a capture screw is configured to be inserted through the through hole of the abutment, through the locating member and into the threaded opening in the head of the implant screw.

"In a further optional aspect, the base member defines at least one recess in the top. The bottom of the abutment defines at least one recess that is aligned with the recess in the base member when the abutment is placed onto the base member. The alignment feature comprises a pin that is configured to fit within the recess of the base member and the abutment. The abutment and the base member each include another recess that are aligned with each other when the abutment is placed onto the base member.

"In some cases, the central opening is tapered, and the implant screw has a tapered head section to seat within the tapered central opening. In another feature, the outer periphery of the base member includes a coating or surface treatment to increase the surface area of the outer periphery to promote osseointegration. Further, a crown is adapted to be mounted to the abutment.

"In yet a further embodiment, the invention provides a platform for securing a dental crown to a patient's jawbone. The platform comprises a base member that is adapted to be embedded within a patient's jawbone at a treatment site. The base member has a generally flat top side, a generally flat bottom side, an outer periphery, and a central opening that tapers inward with a constant taper from the top surface to the bottom surface and is configured to receive an implant screw. The top side has a top surface that is disposed at an angle relative to a bottom surface of the bottom side.

"In still a further embodiment, a dental implant system comprises an integral base member/abutment having an upper portion and a lower portion. The upper portion is shaped to receive a crown, and the lower portion is adapted to be at least partially embedded within a recess in a patient's jawbone at a treatment site. A central opening extends through the base member/abutment. The system as includes an implant screw that comprises a head and a threaded end. The threaded end is adapted to pass through the central opening and into the patient's jawbone, and the head is adapted to be seated within the central opening of the base member/abutment after the threaded end is screwed into the patient's jawbone.

"In another embodiment, a method for securing a dental implant system to a patient's jawbone includes the step of removing a portion of the patient's gum at a treatment site sufficient to expose the patient's jawbone. A portion of the patient's jawbone at the treatment site is also removed to form a recess. This recess preferably has a shape and size similar to a base member that will subsequently be placed into the recess. This base member has a generally flat top side defined by an outer perimeter and a tapered central opening. The base member is positioned in the recess, typically with the top side being flush with a top surface of the jawbone. A drill bit is placed through the central opening and a hole is drilled in the jawbone. An implant screw is inserted through the central opening. This implant screw has a head with a tapered section and a threaded end. The implant screw is turned to secure the threaded end within the hole in the jawbone and to seat the head of the implant screw within the tapered opening of the base member.

"In some cases drill bits of increasing size may be inserted into the central opening to progressively expand the size of the hole in the jawbone. In one particular aspect, the base member is generally rectangular in geometry as is the recess in the jawbone.

"With the base member secured, an abutment is placed onto the top surface of the base member. To help prevent rotation of the abutment relative to the base member, the top side of the base member may include at least one recess and a locating pin that is placed in the recess. The locating pin is inserted into a corresponding recess on the abutment when placing the abutment onto the base member.

"In one aspect, the implant screw includes a threaded hole. In this way, a capture screw may be inserted through a central opening of the abutment and into the threaded hole to secure the abutment to the base member. Further, the implant screw may be seated into the jawbone using a torque wrench using a force of at least about 35 Ncm.

"The abutment may include a locating sleeve extending from the central opening of the abutment. The locating sleeve may be placed into the central opening of the base member to help position the abutment on the base member.

"Prior to placement of the abutment, a healing cover may be placed onto the base member and the patient's gun sutured over the healing cover. The healing cover in one aspect extends to the outer perimeter of the base member. After the site as healed, the healing cover is accessed and removed from the base member. A tissue contouring cap may then be placed onto the base member using a screw that extends into the implant screw. This helps to form the surgical site area and prepare it for receiving the crown. After the tissue has properly formed, the healing cover is removed and the abutment is secured to the base using a capture screw that extends through the abutment and into the implant screw. Further, a crown is attached to the abutment.

"In one particular aspect, the base member has a generally flat bottom side, and the central opening tapers inward from the top surface to the bottom surface with a constant taper. Also, the base member has an outer periphery that tapers with a straight taper inward from the top surface to the bottom surface such that the top surface is greater in surface area than the bottom surface. Further, the outer periphery of the base member may be roughened.

"The invention further provides a dental implant system that comprises a base member that is adapted to be embedded within a patient's jawbone at a treatment site. The base member has a generally flat top side defining an outer periphery, a bottom side, and a central opening. At least one recess is included in the top side for receiving an alignment pin. The system further includes an implant screw that comprises a head and a threaded end. The threaded end is adapted to pass through the central opening of the base member and into the patient's jawbone. Also, the head is adapted to be seated within the central opening of the base member after the threaded end is screwed into the patient's jawbone. The implant screw further includes a threaded opening in the head.

"The system may further include an abutment that is configured to be placed onto the top side of the base member so that a crown may be placed on the abutment. The abutment comprises a flat bottom surface that is configured to be positioned adjacent the top side of the base member. The bottom surface of the abutment has an outer perimeter that generally matches the outer periphery of the base member. The bottom surface defines at least one recess that is aligned with the recess in the base member when the abutment is placed onto the base member. The abutment further includes a shaped upper surface that is adapted to receive a crown and a through hole extending longitudinally through the abutment.

"In some cases, a locating sleeve may extend from the through hole of the abutment and into the head of the implant screw. Also, an alignment pin may be placed within the recess of the base member and the abutment. Further, a capture screw may be inserted through the through hole of the abutment, through the locating sleeve and into the threaded opening in the head of the implant screw.

"In one aspect, the abutment and the base member each include a second set of recesses. These recesses are aligned with each other when the abutment is placed onto the base member. Another alignment pin is placed within the second set of recesses. In a further aspect, the sleeve is cylindrical in geometry, and the capture screw has an upper end with a smooth outer surface that is configured to fit within the sleeve.

"In one particular aspect, the central opening is tapered, and the implant screw has a tapered head section to seat within the tapered central opening. Also, the base member may be generally rectangular in geometry. Further, the outer periphery of the base member may taper inward from the top surface to the bottom surface such that the top surface is greater in surface area than the bottom surface. The outer periphery of the base member may be roughened.

"In yet a further embodiment, the invention provides a platform for securing a dental crown to a patient's jawbone. The platform comprises a base member that is adapted to be embedded within a patient's jawbone at a treatment site. The base member has a generally flat top side, a generally flat bottom side, an outer periphery, and a central opening that tapers inward with a constant taper from the top surface to the bottom surface and is configured to receive an implant screw. The top side further includes a pair of recesses that are adapted to receive alignment pins that are configured to be received within corresponding recesses of an abutment to ensure non-rotatable alignment of the abutment with the base member.

"In one particular embodiment, the invention further provides an exemplary method for securing a dental implant (or implant screw) to a patient's jawbone. According to the method, a portion of the patient's gum is removed sufficient to expose the patient's jawbone. This may be done after the patient's tooth or other dental work has been removed. Also, a portion of the patient's jawbone is removed. The depth of bone removal may be in the range from about 1 mm to about 4 mm. A base member is positioned at the treatment site such that it is embedded within the patient's jawbone wherein the bone has been removed. The base member may have a generally flat top side defined by an outer perimeter, a tapered central opening and at least one screw hole that is positioned between the central opening and the outer perimeter. A small securing screw is placed through the screw hole and rotated until it is screwed into the patient's jawbone and a head of the securing screw is at least flush with the top side of the base member. In this way, the base member is embedded within and securely fastened to the patient's jawbone. This base member will subsequently serve as a stable platform for a prosthesis. An implant screw is placed through the central opening of the base member. The implant screw has a head with a tapered section and a threaded end. The implant screw is turned to secure the threaded end within the jawbone and to seat the head of the implant screw within the tapered opening of the base member. Once the implant screw is secured to the jawbone and appropriate healing has occurred, a prosthesis, such as a crown, may be coupled to the implant screw.

"In one aspect, the base member includes two screw holes that are positioned between the outer periphery and the central opening. As one example, the base member may be generally rectangular in geometry, with the two screw holes being located in corners of the base member. This serves to further secure the base member to the patient's jawbone. Also, when the base member is rectangular, the surgeon may also surgically remove a rectangular section of the jawbone so that the base member will fit within the resulting depression in the jawbone.

"In another aspect, the top side of the base member may be embedded within the jawbone such that it is generally flush with the top surface of the patient's jawbone. In a further aspect, the top side may further include at least one matable feature that is configured to mate with a corresponding feature on a crown to ensure non-rotatable alignment of the crown with the base member. The implant screw may further include a threaded hole and the crown may include a bolt so that the bolt may be screwed into the threaded hole.

"In yet another aspect, the base member may have a generally flat bottom side, and the central opening may taper inward from the top surface to the bottom surface with a constant taper. Further, the base member may have an outer periphery that tapers with a straight taper inward from the top surface to the bottom surface such that the top surface is greater in surface area than the bottom surface.

"In some cases, the outer periphery of the base member may be roughened to increase the surface area of the base member. This in turn serves to enhance bone growth to the base member.

"In another embodiment, the invention provides a dental implant system that comprises a base member that is adapted to be embedded within a patient's jawbone at a treatment site. The base member has a generally flat top side defining an outer periphery, a bottom side, a central opening, and at least one screw hole positioned between the central opening and the outer periphery. The system also includes an implant screw that comprises a head and a threaded end that is adapted to pass through the central opening of the base member and into the patient's jawbone. The head of the implant screw is adapted to be seated within the central opening of the base member after the threaded end is screwed into the patient's jawbone. The system further includes a securing screw that is smaller in size than the implant screw and has a head and a threaded end. The threaded end of the securing screw passes through the screw hole of the base member and into the patient's jawbone. In this way, the securing screw may be used to help further secure the base member to the patient's jawbone. In turn, this helps to stabilize the implant screw and the prosthesis that will be coupled to the implant screw.

"In one aspect, the central opening is tapered and has a beveled edge. Also, the implant screw has a tapered head section to seat within the tapered central opening. This particular configuration is also useful in preventing microleakage between the base member and the implant screw.

"In another aspect, the base member is generally rectangular in geometry, and the securing hole is located in a corner of the base member. In one particularly useful arrangement, the base member has two securing holes for use with two securing screws. The securing holes are located in opposing corners of the base member. Also, the securing holes may have a tapered section and the heads of the securing screws may have a tapered section. Further, the securing screws may each have a pointed end and a diameter of about 1.5 mm.

"In a further aspect, the base member includes a plurality of retention grooves that are located on the outer periphery. Also, the outer periphery of the base member may tapers inward from the top surface to the bottom surface such that the top surface is greater in surface area than the bottom surface. With this arrangement, the taper may begin below retention grooves. Additionally, the outer periphery of the base member is roughened to facilitate bone growth.

"The system may be used with various prosthesis. For example, a crown may be mounted to the head of the implant screw. In some cases, the top side of the base member may includes at least one matable feature, and the crown may also include a corresponding matable feature that mates with the feature on the base member to non-rotationally secure the crown to the base member. The implant screw may include a threaded hole and the crown may include a bolt so that the bolt may be screwed into the threaded hole.

"In yet another embodiment, the invention provides a platform for securing a dental crown to a patient's jawbone. The platform comprises a base member that is adapted to be embedded within a patient's jawbone at a treatment site. The base member has a generally flat top side, a generally flat bottom side, an outer periphery, a central opening and a screw hole positioned between the central opening and the outer periphery. The central opening tapers inward with a constant taper from the top surface to the bottom surface and is configured to receive an implant screw. The top side may further include at least one matable feature that is configured to mate with a corresponding feature on a crown to ensure non-rotatable alignment of the crown with the base member.

"In one aspect, the outer periphery may include a plurality of retention grooves, and the outer periphery may taper with a straight taper inward from the retention grooves to the bottom surface such that the top surface is greater in surface area than the bottom surface. In another aspect, the base member may be generally rectangular in geometry, and the securing hole is located in a corner of the base member. Two or more securing holes and securing screws may also be used."

For additional information on this patent, see: Grant, James C.; Renehan, Bradley. Angled Dental Platform Assembly and Methods. U.S. Patent Number 8740616, filed November 16, 2011, and published online on June 3, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8740616.PN.&OS=PN/8740616RS=PN/8740616

Keywords for this news article include: Surgery, Dentistry, Bone Research, Medical Devices, Dental Implantation, Grant Dental Technology, Prosthesis Implantation, Preprosthetic Oral Surgical Procedures.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Journal of Engineering


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters