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At least 865 records · Page 48Linked to original sources
PubMedDate not supplied

Physical characteristics of a new cleaning and polishing agent for use in a prophylaxips paste.

A prophylaxis composition containing a sodium-potassium aluminum silicate abrasive system was evaluated in the laboratory in comparison with several different commercial prophylaxis pastes. The in vitro data indicate that the new composition increases enamel polish and decreases abrasion characteristics without sacrificing cleaning efficacy when compared with the commercial products tested.

Aluminum Silicates↗
PubMedDate not supplied

Stress concentrations at the apex of pinned, implanted teeth.

Stress in the alveolus at the apex is reduced when the implant is held by a pin through the alveolar wall. This stress reduction is effected by transfer of part of the coronal force to the alveolar wall by the pin. Pin positions centrally located between the apex and the alveolar crest provide the greatest reduction of stress concentration in the alveolus at the apex. Since the bone is especially fragile near the alveolar crest, care must be taken when the pin is positioned in this region. Positioning the pin near the apex has the least effect on reducing the stress in the alveolus at the apex. Although no data were obtained relating to stress in the alveolar wall at points of pin penetration, results given here do indicate that from 7 to 30% of the intrusion component of the coronal force is transmitted to the alveolar wall by the pin. Additional research is needed to determine the effects of stress at the pin through the alveolar wall because of load transfer by the pin from the implant to the alveolar wall. The situation in the alveolar wall would be one of creation of a completely unnatural stress rather than reduction of an existing stress, as was the case at the apex. Whether the reduction of stress at the apex and the creation of stress at the pin through the alveolar wall are of physiological benefit is a question that must yet be answered.

Alveolar Process↗
PubMedDate not supplied

Luminescence spectra of dental porcelains.

The luminescence spectra were obtained for a series of porcelain teeth and powders currently used in this country. Comparison was made between the spectra of these materials and the spectra of plastic teeth and natural tooth structures. It was found that many of the porcelain teeth and powders have strikingly different luminescence characteristics than those of natural teeth.

Acrylic Resins↗
PubMed1981

Frictional behavior and surface failure of acrylic denture teeth.

The water characteristics of acrylic denture teeth were investigated under single- and double-pass sliding. The response of acrylic teeth to sliding was that of a relatively ductile material. The wear characteristics were affected similarly by environments of water and saliva. The "enamel" surfaces showed more resistance to penetration and were less susceptible to surface damage than the "dentin" surfaces. The effect of the second pass was to increase track width and cause a more severe mode of surface failure.

Acrylic Resins↗
PubMed1985

A new method for matching tooth colors with color standards.

A new method for quantitative intra-oral tooth color determination is presented. Basically, the tooth color is assessed by visual comparison with opaque color standards, which are logically arranged according to three visual color dimensions. The standards were analyzed spectrophotometrically, and the C.I.E. color coordinates were computed. Illumination and observation were standardized during the matching procedure. Two distinct situations, method 1 and method 2, were investigated. The situation in method 1 is to be considered as large window illumination and small window collection of the reflected light. For method 2, the same small window was used for both illumination and observation. Using both methods, the color of a tooth could be quantified into three separate color dimensions. Using method 1, the consistency among 25 examiners was high in determining the color of ten teeth; using method 2, the inter-examiner agreement was low. For the same tooth, different color standards were selected with method 1 or method 2. The standard selected with method 2 often appeared to be in disagreement within clinical expectations. The differences in results between method 1 and method 2 are explained by the optical properties of the translucent dental enamel (e.g., volume reflection). Method 1 allows for reproducible quantification of clinical tooth discoloration according to C.I.E. color specifications and can possibly be applied in prosthetic dentistry.

Color↗
PubMed1984

Models for multi-band training and examining.

A substitute for traditional Typodont techniques is described. The production and use of acrylic models, which are attached to the dental chair, and allow the practice of routine clinical procedures, is recommended.

Models, Dental↗
PubMed1990

Temporary pontics in aesthetic orthodontics--a new design.

A new and simple technique for aesthetic tooth replacement during orthodontic treatment, with a pontic using orthodontic wire mesh, is described and appears in the author's clinical practise to be superior to the other techniques reported previously. These pontics may be used in maxillary first bicuspid extraction cases, and with adaptation where anterior teeth have to be replaced because of agenesis, extractions, or traumatic loss. This technique thus also provides the clinician with an aesthetic and dependable space maintainer for anterior teeth whilst orthodontic treatment is being completed.

Adult↗
PubMed1995

The effects of archwire forces on incisor intrusion.

The forces exerted by archwires were measured in association with both Begg and Straight-Wire attachments. Seven stainless steel and three nickel-titanium wires were tested at vertical deflections equivalent to 20, 30, and 40 degrees, these being incorporated via anchor bends or reverse curve of Spee as appropriate to each system. All seven brands of stainless steel arches demonstrated similar performance. An increase in archwire diameter from 0.016 to 0.018 inch increased intrusive forces by 64 per cent for stainless steel and 58 per cent for nickel-titanium. Increasing anchor bend or reverse curve of Spee produced considerable force increases across the range of specimens. Begg archforms produced more force than Straight-Wire archforms of similar deflection when attached to molars only. Attachment of archwires to second premolars in addition to molars reduced the intrusive forces produced by Begg arches, but increased the forces of Straight-Wire arches.

Analysis of Variance↗
PubMed1996

Direct bonding to typodont teeth.

Three methods of bonding orthodontic brackets to acrylic teeth were investigated for use with a typodont. One-hundred-and-twenty Dentaurum 0.018 x 0.025 inch standard Edgewise brackets were bonded to Crylopax cross-linked acrylic teeth using three cements: Concise composite, Concise with acrylic primer, and GAC acrylic cement on a previously roughened tooth surface. Half the specimens in each group was immersed in a thermostatically controlled water bath for 15 min on 20 occasions over a 5-day period, to simulate the conditions of a typodont, prior to measuring tensile bond strength on an Instron machine. Under dry conditions Concise composite was significantly stronger than either Concise with acrylic primer or GAC cold cure acrylic resin. Under wet conditions, however, the mean bond strength of the acrylic resin increased significantly compared to the other cements. The bond strength of both Concise and Concise composite with primer deteriorated following water immersion. It is suggested that when setting up typodont teeth with brackets bonded with GAC acrylic resin, immersion of the bonded teeth in hot water prior to positioning of the teeth in the typodont may greatly reduce the risk of subsequent bracket loss.

Acrylic Resins↗
PubMed2002

Traumatic overbite: a restorative solution.

Deep overbite is frequently seen in the adult dentition. Although the condition is usually asymptomatic, certain factors may lead to the development of deep traumatic overbite, and in partially dentate patients loss of posterior occlusal support may be a contributory factor. Several treatment modalities, including orthodontics, orthognathic surgery and prosthodontics have been used but, as some adult patients with this problem are unwilling to avail themselves of treatment involving either orthodontics or orthognathic surgery, a restorative approach using a combination of fixed and removable restorations may provide a satisfactory solution. This paper details a case report on the restorative management of a partially dentate adult patient with a deep traumatic overbite.

Adult↗