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At least 1,441 records · Page 80Linked to original sources
PubMed1985

Preimpression preparation for positive recovery of master casts.

A technique has been described to ensure positive recovery of a cast by using wax to enlarge teeth that have diastemata and teeth that are periodontally involved with bone loss. On removal of the wax, a void is created in the impression. Stone poured into the void will strengthen the involved teeth so that the cast will not fracture on removal from the impression.

Dental Casting Technique↗
PubMed1985

Solid base working cast.

A technique is presented to facilitate the fabrication of single or multiple restoration die working casts. The technique allows a full remount potential for use especially in multiple centric relation record verification techniques. A die removal technique that will not damage the brass dowel pin is suggested.

Dental Casting Technique↗
PubMed1996

Surgical guide fabrication for an angled implant.

This article describes the steps necessary for determining ideal implant abutment position and, subsequently, the optimum implant location that would make this abutment position possible. Procedures necessary for fabricating a surgical guide are explained for placing an ITI angled implant.

Dental Implantation, Endosseous↗
PubMed1997

One clinical visit for a multiple implant restoration master cast fabrication.

The making of a one-piece, long-span, implant-supported prosthesis with conventional procedures frequently has difficulties associated with the accuracy of fit. This article presents a clinical and laboratory procedure for making an accurate implant working cast that facilitates fabrication of the casting on the master cast. The procedure demonstrates the process of sectioning and rejoining of the resin between the transfer copings and then pouring the impression by first joining the analogs alone with impression plaster, sectioning it, and rejoining it again to stabilize the analogs, and finally, using dental stone to pour the impression. Clinical, radiographic, and laboratory (optical microscope) measurements for one clinical implant restoration confirm the accuracy of fit of this one prosthesis made with this procedure. Its advantage is that it can allow fabrication of the final casting on the cast, thereby eliminating the clinical time necessary to obtain repetitive solder indexes, and thus minimizing inconvenience to the patient.

Calcium Sulfate↗
PubMed1998

A universal boxing procedure: irreversible hydrocolloid and magnetic strip.

The goal of impression making is an accurate cast. The boxing procedure is a crucial step to preserve the details of the final impression especially of the vestibular area. This article describes an alternative boxing procedure that is compatible with all impression materials, is efficient, simple, inexpensive, and practicable.

Alginates↗
PubMed1999

Comparison of cutting efficiency and instrumentation of curved canals with nickel-titanium and stainless-steel instruments.

The cutting efficiency and the effects of instrumentation on curved canal shape of both stainless-steel and nickel-titanium nonstandardized ProFile Series 29 hand instruments and stainless-steel Flexoreamer were investigated under standardized conditions. Concerning cutting efficiency in rotary motion, the Flexoreamer had significantly (p < 0.01) greater cutting efficiency than stainless-steel ProFiles and nickel-titanium ProFiles. Changes in the canal shape differed significantly between the different instruments at all measuring points (p < 0.001). After instrumentation with Flexoreamers with inclusion of two half-sizes (#17 and #22), there were fewer undesirable changes in canal shape compared with both stainless-steel and nickel-titanium ProFile Series 29 instruments. In this study, it seemed that flexible stainless-steel instruments with noncutting tips were superior to the nonstandardized ProFile Series 29 instruments with regard to cutting efficiency and instrumentation of curved canals.

Analysis of Variance↗
PubMed1983

Concomitant transverse growth of the maxillary base and dental arch in experimental submucous mid-palatal clefts. A biometrical study in the domestic cat.

To obtain information on correlated growth of the maxillary base and dental arch in submucous mid-palatal clefts, such clefts were surgically created in 18 domestic cats. The growth ratios of the dento-maxillary complex were then compared with corresponding parameters in 18 unoperated controls. When fully grown, the operated cats had developed a significant hypoplasia of the maxillary base. Also the upper dental arch in these cats showed a slight reduction in width, but significantly so only in the posterior region. The results obtained seemed to demonstrate a mutual dependence in growth of these two parts of the dento-maxillary complex, but to a limited degree. Whereas the maxillary base was significantly influenced by the altered morphology in the mid-palatal area, the dental arch growth and its final dimension seemed to be more responsive to compensatory mechanisms.

Animals↗
PubMed1988

Xerox copy of the dental cast for analysis of the stability of mandibular osteotomy.

Stability of the mandible was analysed with a Xerox copy of the dental cast in 35 cases of mandibular prognathism corrected by ramus osteotomies. The occlusal relationship in the Xerox copy was illustrated by superimposing two contact points on the upper and lower dental arches and the change in the position of the lower dental arch in relation to the upper dental arch was obtained by superimposing the latter on preoperative, predicted postoperative, and six months postoperative occlusions. The stability of the mandible was analysed by measuring the movement of five landmarks (two posterior, two molar and one incisor points) set around the lower dental arch to represent the movement of the mandible. The relapse was estimated by the movements of the landmarks from the predicted postoperative occlusion to the six months postoperative occlusion. The mean estimated anterior relapses at the posterior and molar points with the larger predicted movement and the incisor point were between 0.9 mm. and 2.0 mm. at six months postoperatively, whereas on the side with the smaller predicted movement, the points moved posteriorly by 0.6 mm. and 0.5 mm. Despite the fact that the amount of the predicted lateral movement was much smaller than that of the predicted posterior movement at operation, the posterior points were estimated to relapse laterally by 2.0 mm. and 1.7 mm.(ABSTRACT TRUNCATED AT 250 WORDS)

Cephalometry↗
PubMed2004

Training in tooth preparation utilizing a support system.

Tooth preparation is an essential technique for dental treatment, but it is a skill not easily learned by a dental student. To facilitate this leaning process, a new tooth preparation support system with a parallel link mechanism was developed. This study reports the educational efficiency of this system for dental students. Dental students with no experience in clinical practice were selected and divided into two groups; one trained with this support system; and the other, with freehand preparation. They prepared axial walls in right maxillary second premolars and molars mounted in a phantom manikin with an air-turbine handpiece. Convergence angles of the axial walls and parallelisms between axes of prepared teeth were evaluated. Training with the support system led to significantly smaller convergence angles and parallelisms as compared with freehand preparation training. With the freehand preparation after training, the convergence angles and parallelisms became smaller in the group trained with the support system than those trained with freehand. The above findings suggest that training in tooth preparation utilizing the newly developed support system can be one of practical programs that are useful for dental students to achieve greater competency in tooth preparation.

Bicuspid↗
PubMed2000

Shaping ability of Hero 642 rotary nickel-titanium instruments in simulated root canals: Part 1.

AIM: To determine the general efficacy and shaping ability of Hero 642 nickel-titanium rotary instruments during the preparation of simulated canals. Part 1 of this two-part report describes the efficacy of the instruments in terms of three-dimensional canal form. METHODOLOGY: A total of 40 simulated root canals made up of four different shapes in terms of angle and position of curvature were prepared by Hero 642 instruments using a crown-down preparation sequence. The efficacy of the instruments was assessed in terms of preparation time, instrument failure, canal blockages and loss of canal length. Intra-canal impressions were taken of the prepared canals in order to assess three-dimensional canal form. RESULTS: The mean time for canal preparation was 8.6 min and was influenced significantly (P < 0.05) by canal shape. Two instruments fractured and eight instruments deformed; significant differences were observed between canal shapes (P < 0.05). All of the canals remained patent. Fifteen canals (39.5%) maintained the correct working distance, 15 lost distance and eight canals gained length. Examination of intracanal impressions demonstrated that the majority of canals (79%) had apical stops; canal shape had a significant influence (P < 0.001) on the quality of apical stops. With one exception all canals had smooth canal walls and all of the canals showed good flow characteristics. Taper was poor in 30 canals (79%) and good in eight canals (21%). CONCLUSIONS: Hero 642 rotary nickel-titanium instruments prepared simulated canals rapidly but with a three-dimensional form that lacked adequate taper.

Dental High-Speed Equipment↗