A BULLETIN DEALING WITH ISSUES FOR DENTAL HEALTH PROFESSIONALS
Inside This Issue
1. Outstanding Bonding with the Silano Pen
2. Retrievable Bridge with Tap and Screw
3. Vario Stud VKS-SG Castable Housing
4. Comparing Effective Reline Procedures
5. Trade News: Dentists Most Ethical
6. Announcements: George Brown College, Mr. Bernie Mullen, RDT
Silano Pen, AssortmentThe Silano-Pen is not only a “mini silicoater” it is also a true innovation in the field of bonding systems. Simple application and handling render it suitable for both laboratory and clinical use. The bonding strength values for almost all alloys and composites that can be achieved with the pen are as good as the ones that can be obtained with conventional procedures. The current initial results of the pen indicate that it permits the use of an adhesive technique for both ceramic and composite restorations without the necessity of performing complicated pre-treatment. The Silano-Pen is a gas burner which is the size of an ink pen. A special gas which is enriched with silanes is filled into the pen. When ignited the flame gives off small elements which subsequently deposit as a silicate-like glassy layer on the surface to be veneered. A very interesting and useful aspect of the pen is the fact that almost all types of materials can be bonded. New research results of the bonding strength and the areas of usage of the Silano-Pen are published in issue No. 3 / 2001 “Quintessenz fur Zahntechnik” carried out by Zentrum fur Zahnmedeizin, Charite / Berlin under the guidance of Prof. Dr. H.J.Tiller and Prof. Dr.J.F.Roulet.
For a free copy of the research or further information on the Silano-Pen, contact us at Dent-Line of Canada Inc via e-mail at firstname.lastname@example.org or call us at 1-800-859-7589 .
In cases were we want to retrieve a bridge in the future, the Bridge Sectioning Attachment can be utilized. This attachment can be used mesially or distally to an abutment. The bridge sectioning attachment is a cylindrical vertical tube which is manufactured from extruded plastic and burns out in the furnace. It can be also adjusted to fit the gingival. Using the paralleling mandrel, place the attachment to the abutment. After casting the surface; the section connecting the attachment is milled smooth with a 0 degree cutter and then polished. The Bredent Drill and Tap Tool Kit contains ten components. This includes 2 taps, 4 drills, a screw driver, a tap holder and two titanium screws. Select the center drill and create the entrance point on the lingual of the attachment. This is to start the next drill and prevent traveling. Take the multi-drill (1.2 x 5mm) from the tool set and using the point of entry already created, drill a hole 2 mm into the attachment. Applying Bredent milling oil prevents the drill from over heating and breaking. Next select the stop drill (1.2 x 2 mm) to drill further into the hole precisely to the required depth. This fool proof method allows room for the threaded screw. After this procedure the counter-sinking drill is used to widen the existing hole to 1.4 mm to accommodate the threaded screw and provide space for the tapered screw head. In the next stage the first tap (1.4 mm) is fixed to the tap holder. The tapping procedure is slow and methodical. Initially place milling oil into the existing hole. The tap is placed into the hole and slowly twisted a few times to the right. Then it is reversed slowly moving out the shards of cut metal. This procedure continues until the tap has threaded the hole completely. The initial thread is a coarse cut. Replace the first tap with the second tap and repeat the procedure again. This last tap will refine the threads so as to match up with the machined titanium screws provided with the tool kit. The titanium screw has a deep hexagonal head that facilitates the screw driver to secure the screw firmly to the attachment; the screw should fit into the attachment by two to three mm. The screw head will be exposed and should extend out lingually about 2.5 mm. The screw has been designed to withstand shear forces up to 1550 Newton’s. The implant abutment will utilize the Security Lock System which will also ensure that the entire bridge will be retrievable. The secondary structure can be started at this stage. The best way to tackle the next step is to lubricate the external area of the screw and the bridge sectioning attachment. Then start to apply a modeling resin (Bredent Pi-Ku-Plast) around the whole area integrating the screw into the pattern. The rest of the bridge is waxed including pontics and the implant abutments. The complete waxed bridge should also include the modeling resin pattern as well. Using the screw driver from the kit remove the titanium screw from the attachment and safely secure it for later. The bridge is sprued, invested, cast and then fitted. The abutment crown and the rest of the bridge are trimmed to receive porcelain. After the porcelain has been baked and before glazing, the titanium screw should be fitted into the restoration. At this stage the head of the screw and the porcelain can be blended together to complete the lingual anatomy. Finish the final glaze and polish the restoration. The minimal dimensions and lingual application provide pleasant aesthetics for all screw retained restorations. Source: Peter T. Pontsa RDT
Relining ProceduresGenerally speaking a reline is the resurfacing of the gingival area of a denture with a new base material in order to increase retention. The reline can address a number of problems that can exist simultaneously. An example of this is tooth wear that is exhibiting progressive over closure involving the patient’s vertical dimension as well as an indication of ridge resorption. To remedy this, the practitioner modifies the denture by grinding out all the tissue surfaces, undercuts and reducing the flanges about 2 mm. A new impression of the arch is taken using the old denture, as a custom tray. It is then processed in the laboratory. There are a number of acceptable procedures on relining a denture such as the flask or jig method. Both procedures can have multiple time consuming steps. This author will concentrate on improving steps on the jig method of relining. The standards of practice is to box and pour the impression using conventional beading and boxing wax. After the master model is poured and set (45 min. to 1 hr.), the model is shaped on a model trimmer and the base grooved (5 min). Next shape a plaster patty on the bottom half of the standard two nut jig. Press the occlusal surfaces and incisal edges into the mix and let set (30 min). Afterward use sticky wax to attach the teeth down to the index. Mix the plaster and attach the master model to the upper member of the jig and allow the plaster to set (45 min). Disassemble the jig and gently separate the denture from the model. On the master model cut a posterior palatal seal. Paint an acrylic separating medium onto the model. Remove the impression material from the denture base and create a butt joint at the dentures peripheral margins. Apply a monomer to the tissue surface of the denture. Mix and apply acrylic to the denture and to the model’s undercuts. Reassemble the jig. Mold the acrylic around the borders and cure in a pressure pot. Recover, trim and polish the reline. Although this is the standard procedure, it can be improved upon. I would recommend starting out with a Renfert Reline Unit since it is designed with three guidance bolts to prevent tilting. It also prevents raising bites and transferring any errors because of its sturdy mounting plates. All components are rust proofed and a PTFE special coating prevents plaster sticking. This will save time in cleaning and applying Vaseline coating. To increase efficiency the model and index can be produced in one working step. The impression is taken and a mixture of 50/50 plaster and stone is placed on the bottom of the reline unit plate about 2 in (5 cm) high ensuring the mix is very stiff. Next the mixture is vibrated into the denture. It is placed on the plaster/stone mixture, teeth side facing upward. The plaster mixture is gently placed on the occlusal surface and built up. The upper mounting plate is placed and secured with the nuts. Extra mix is applied over top of the plate to keep the index secure. This one step method will save more than one hour of setting time over the conventional jig method discussed above. The flask method will take even longer time. Source: Peter T. Pontsa RDT. For further information, call Dent-Line of Canada Inc. at 1-800-859-7589 or e-mail us at email@example.com
We would like to remind all users of the SG attachment from Bredent that a castible housing is available in both 2.2 mm and 1.7 mm ball sizes. The housing is CAD/CAD designed and is manufactured from extruded plastic which burns out in the furnace. You can sprue and cast in the alloy of your choice. It can be soldered onto chrome partial or it can be incorporated into acrylic since it has an extended tag for retention. This housing gives the user more control over the outcome if the chrome casting is not made in your laboratory. The housing can be utilized for new cases or old cases that may require a repair or rebuild. For further details contact us at Dent-Line of Canada Inc., toll free, at 1-800-859-7589.
Dentists placed eighth on the list of the most trusted professionals. This according to the Gallup Organisations annual public opinion poll on honesty and ethics in U.S. professions. Fifty-eight percent of the poll’s respondents rated honesty and ethical standards of dentist’s as “very high” or “high”. According to the poll, the top 10 most trusted are: 1, nurses;
2, pharmacists; 3, veterinarians; 4, medical doctors; 5, grade and high school teachers; 6, clergy; 7, college teachers;
8, dentists; 9, Engineers; and 10, policemen. The ADA Future of Dentistry Report is now available on line at www.ada.org. Three years in the making, the report describes the status of the dental profession, observes recent trends, and envisions challenges dentist will face in the next five to 15 years and makes recommendations. Source: LMT To-Day, Jan. 2002 Vol. 18, No. 4.
Mr. Bernie Mullen, RDT accepts awardDent-Line of Canada Inc. is pleased to announce that Bernie Mullen, RDT is the recipient of the first annual Dent-Line Achievement Award. On February 27th, at George Brown College, Mr. Bernie Mullen, RDT was recognized for his contributions to education and the profession in general. On behalf of Dent-Line of Canada, Peter T. Pontsa, RDT presented the award.
Students at George Brown College, Milling CourseDent-Line of Canada Inc. is pleased to announce that on February 8th, 2002, Peter T. Pontsa, RDT met with the George Brown Third Year Dental Technology Program students. Mr. Pontsa introduced them to milling techniques and explained attachment placement as well as the theory behind the stress breaking arm and how it prevents loading. Many of these enthusiastic students tried their hand at milling while being offered guidance and encouragement.