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PubMed1998

Rotary reduction, enamel microabrasion, and dental bleaching for tooth color improvement.

Tooth color and shade can have an important influence on a person's appearance. Brown and white enamel dysmineralization defects, white hypocalcification lesions, and natural variations in tooth shading can detract from an otherwise attractive smile. Bonded facial composite resins, porcelain veneers, or full-coverage restorations can be used for color correction. A more conservative and less expensive approach is to eliminate or reduce the discoloration. In select cases this can be done without removing significant tooth structure and without placing restorative material to mask the tooth. This article describes a combination of "microreduction," microabrasion, and dental bleaching for tooth color correction that has worked well for certain patients. The method is easily performed, conservative, inexpensive, and requires minimal subsequent maintenance.

Adolescent↗
PubMed1997

Increasing patient satisfaction with natural denture teeth.

Successful laboratory communication in removable prosthodontics will always be more complex than in fixed prosthodontics. However, the unique characteristics of natural denture teeth (SR-Antaris/SR-Postaris), Ivoclar Williams, Amherst, NY) are enabling clinicians to overcome functional and aesthetic challenges. Specifically, the characterized anatomy of these anterior and posterior teeth, and their translucency and natural layering, facilitate the reestablishment of a natural smile. This article describes the benefits of SR-Antaris/SR-Postaris denture teeth and provides guidelines for communication with the laboratory to ensure predictable results.

Denture, Partial↗
PubMed1997

IPS Empress veneers. Color communication, laboratory fabrication, and cementation.

Once considered to be revolutionary, porcelain veneers are now the foundation of most aesthetic dental practices. Requiring only conservative preparations, porcelain veneers can dramatically change a smile. This article discusses the technique necessary to prepare and place porcelain veneers, using a new pressed-ceramic system. Close and thorough cooperation and communication between the clinician and the laboratory are essential throughout the procedure, and this article is coauthored by a dentist and a ceramist.

Adult↗
PubMed1998

[Orthotopic bilateral ureterocele].

OBJECTIVE: To describe two additional cases of bilateral orthotopic ureterocele and review the literature. METHODS/RESULTS: Both patients, a 70-year-old male and a 56 year-old female, were diagnosed by IVP. Treatment was by a bilateral transverse "smile" incision, which achieved good functional results. However, one of the patients with a calculus inside both ureteroceles developed unilateral grade II-III vesico-ureteral reflux. CONCLUSIONS: Despite the risk of developing vesicoureteral reflux, the transurethral transverse incision is a good method of treatment in symptomatic bilateral orthotopic ureterocele.

Aged↗
PubMed1998

[Endoscopic therapy of ureterocele: description of a case].

Ureterocele is a cystic dilatation of the terminal intravesical ureter; the therapeutic options are different and correlated on upper and lower urinary tract anatomy. The goals of treatment include control of infection, protection of ipsilateral and controlateral renal units and maintenance of vesicoureteral continence. The endoscopic approach is still debated; many authors report a higher risk of post-operative vesticoureteral reflux and further surgery. When the intravescical ureterocele is associated with the upper pole of a duplex system a small endoscopic transverse incision as definitive treatment has gained support in more than 90% of cases. We report a case of intravesical ureterocele with a complete duplex system, in a young woman treated by endoscopic incision as "smiling mouth" with good results of 6 months follow-up.

Adult↗
PubMed1997

Esthetics and vertical tooth position: orthodontic possibilities.

Throughout the 1990s, esthetic dentistry has become a prominent part of the treatment protocol of most dentists. Patients have become more conscious of the benefits of a beautiful smile and are willing to invest time and money to improve the appearance of their teeth. Many of these patients can be treated with routine restorative procedures (crowns, composites, laminates) to achieve the desired results. However, some patients have problems with tooth position that create significant discrepancies in gingival levels which can compromise the esthetic result of restorative dentistry. Prerestorative orthodontic therapy can often resolve these tooth position problems and enhance the esthetic restoration. This article describes the indication, methods, and results achieved when orthodontics preceded restorative dentistry in the treatment of various esthetic challenges.

Adult↗
PubMed1998

The AMSA injection: a new concept for local anesthesia of maxillary teeth using a computer-controlled injection system.

This article describes a new injection technique for the maxillary arch that achieves pulpal anesthesia of the central incisor through the second premolar without collateral anesthesia of the face and muscles of expression. This palatal injection can be delivered easily, consistently, and virtually imperceptibly with a recently introduced computer-controlled local anesthesia delivery system. The anterior (AMSA) middle superior alveolar block, is a single-site injection requiring less than one cartridge of anesthetic and is ideal for maxillary esthetic restorative dentistry because it does not distort the smile line. A clinical example is also presented.

Anesthesia, Dental↗
PubMed1998

The science of communicating the art of dentistry.

Laboratory work authorization forms are mainly developed in the form of written instructions, two-dimensional drawings or photographs. These can be supplemented with other forms of communications, which will give three-dimensional information and take into account the lips, which are considered the frame of the teeth. This article will describe a systematic approach to communication with a patient and laboratory technician using three-dimensional aids such as a smile replica, lip reproductions, provisional restoration casts and soft tissue casts.

Communication↗
PubMedDate not supplied

Color change and fracture resistance of two preveneered stainless-steel crowns after sterilization.

PURPOSE: This study compared the fracture resistance and color stability of two commercially available, preveneered stainless-steel crowns before and after four sterilization techniques. METHODS: Thirty-five crowns from each of two manufacturers were divided into five groups. Four groups were sterilized twice using one of the following techniques: steam autoclave at both 121 degrees C (15 PSI) for 20 min and 132 degrees C (30 PSI) for 8 min; Chemiclave with formaldehyde at 132 degrees C for 20 min; and 2% gluteraldehyde for 10 h. The fifth group from each manufacturer was the control. Color of facings was measured before and after each sterilization in triplicate using a colorimeter, and the variance of each color parameter was analyzed for significance. Fracture resistance was measured for each group and differences between the control and experimental groups analyzed for significance. RESULTS: The results of this study show that high heat and chemical sterilizations have little effect on color and fracture resistance of the preveneered stainless-steel crowns. Student's t test analysis revealed a significantly decreased resistance to fracture with Kinder Krowns sterilized in 2% gluteraldehyde. Chemiclave sterilization caused the most negative color change in all three color parameters measured for both types of crowns. CONCLUSIONS: As neither steam technique produced significant changes in fracture resistance or color changes that were clinically detectable, the results of this study indicate that the two steam techniques tested can be used by clinicians to sterilize either Kinder Krowns or Nu Smile preveneered stainless-steel crowns.

Color↗
PubMed1998

A mutation in the thrombomodulin gene, 127G to A coding for Ala25Thr, and the risk of myocardial infarction in men.

Thrombomodulin is an endothelial cell surface receptor that transforms the procoagulant thrombin into an anticoagulant. A mutation in the thrombomodulin gene is a potential risk factor for venous and arterial thrombosis. We screened a region within the coding sequence of the thrombomodulin gene by single-strand conformation polymorphism analysis (SSCP) in a pilot study of 104 patients with myocardial infarction and 104 age, sex and race matched controls. We identified a 127G to A mutation in the gene, which predicts an Ala25Thr substitution, in 2 out of 104 patients (1 man and 1 woman) with myocardial infarction but in no controls. We assessed the risk of myocardial infarction associated with the mutation in a larger "Study of Myocardial Infarctions Leiden" (SMILE). Among 560 men with a first myocardial infarction before the age of 70, 12 were carriers of the Ala25Thr substitution. In a control group of 646 men, frequency-matched for age, seven were carriers of the Ala25Thr substitution. The allelic frequencies were 1.07% among patients and 0.54% among controls suggesting risk associated with the mutation [odds ratio (OR) 2.0, 95% confidence interval (CI) 0.8-5.1]. In patients aged below 50, the predicted risk was almost seven times increased (OR 6.5, CI 0.8-54.2). In the presence of additional risk factors, such as smoking and a metabolic risk factor, the predicted risk increased to 9-fold (OR 8.8. CI 1.8-42.2) and 4-fold (OR 4.4, CI 0.9-21.3), respectively. While not conclusive, these results strongly suggest that the Ala25Thr substitution is a risk factor for myocardial infarction, especially in young men, and when in the presence of additional risk factors.

Age Factors↗
PubMed1982

Intraoral masseter muscle transposition: use with reconstruction of regional facial paralysis.

The treatment of regional facial paralysis of the lips and commissure by masseter muscle transposition is well accepted and usually accomplished by an external approach. The intraoral transfer demonstrates distinct advantages for the rehabilitation of midfacial regional paresis. The procedure is performed totally intraorally, which exposes the masseter muscle before transposing the anterior portion in a subcutaneous tunnel to the upper and lower lips. The effects of this transposition are direct support and immediate contraction, with eventual myoneurotization of the surrounding perioral musculature. The indications, operative considerations, and results in 22 cases are reported. This technique considerably advances the procedural approaches of the reconstructive surgeon and in used either in conjunction with other reconstructive modalities or as a primary procedure in selected cases.

Facial Paralysis↗
PubMed1989

Smiley's people.

Explore the source record for details and available documents.

Facial Expression↗
PubMed2000

Clinical and sonographic findings in carcinoma of the penis.

PURPOSE: This study was performed to assess the accuracy of high-resolution sonography in measuring penile carcinoma. METHODS: Sonography was performed using a 7.5-MHz linear-array transducer in 59 patients with penile carcinoma. The sonographic measurement of tumor extent was compared with clinical and pathologic measurements. The tumor extent measured by gross pathologic evaluation on cut sections of the fresh penectomy specimen was used as the definitive standard. The echogenicity of the tumor was compared with that of the surrounding normal penile tissue to classify the tumor as hyperechoic, hypoechoic, or of mixed echogenicity (containing both hyperechoic and hypoechoic elements). We evaluated the relationship between the echogenicity of the tumor and both tumor morphology (exophytic or infiltrative) and tumor grade as determined on pathologic examination. RESULTS: The overall mean difference +/- standard deviation in the tumor extent between clinical and gross pathologic evaluation was 3.9 +/- 5.3 mm (range, 1-9 mm), whereas the overall mean difference between sonographic and gross pathologic evaluation was 1.2 +/- 1.7 mm (range, 1-7 mm). As determined with reference to the gross pathologic extent, the error in measuring the extent on clinical examination was significantly greater than the error on sonography (p < 0.001). Lesions involving the glans alone were more often underestimated by clinical examination than were lesions involving the shaft (with or without glanular involvement). The error in measuring the extent of tumor by sonography was not related to the site of the tumor. The tumor was hyperechoic in 21 cases (36%), hypoechoic in 28 cases (47%), and of mixed echogenicity in 10 cases (17%). There was no significant association between echogenicity and tumor morphology or grade. CONCLUSIONS: Sonography gives a more accurate estimate of penile tumor extent than does physical examination. Routine use of sonography for such measurements should enable preservation of more of the penis.

Adult↗
PubMed1975

Mother-infant neonatal separation: some delayed consequences.

An earlier study of mothers of premature and full-term infants showed that the type and amount of social interaction between a human mother and her infant in the immediate postpartum period can influence the mother's subsequent behaviour and attitude towards the infant. Separation of a mother from her infant for as short a time as three weeks in the immediate postpartum period can lead to lowered feelings of maternal competency and decreased amounts of attachment behaviour, sometimes continuing for as long as one month after the pair have been reunited. Follow-up of these mothers and infants at 11, 12 and 15 months after discharge from the hospital showed that the effects of separation on maternal attitude and behaviour had disappeared, except that non-separated mothers continued to touch their infants more than separated mothers. Differences in maternal behaviour varied with birth order and sex of the infant and social class membership of the family. These findings are discussed in terms of ethological and social learning theories as they apply to matenal 'social attachment' in the neonatal period. The importance of considering the consequences of neonatal separation for the entire family rather than mother alone is emphasized.

Attitude↗
PubMed1975

The sociability of two-year-olds with their mothers and fathers.

Twenty-one two-year-olds were observed interacting with their parents in a laboratory playroom. Previously reported analyses had found that they displayes no preferencd for interaction with either parent. The present analysis found that there was a high degree of correlation between the sociability of the cild with his mother and his sociability with his father. Possible implications of this finding are discussed.

Adult↗
PubMedDate not supplied

Contextual stimulus control of conditional vasomotor and electrodermal reactions to angry and friendly faces. Transswitching--yes! Preparedness--No!

An experiment with 42 human Ss used the transswitching procedure to examine tonic stimulus control of phasic and tonic conditioned vasomotor heart rate, and electrodermal reactions. The conditional stimulus (CSs) were photos of angry and friendly human faces, and the unconditional stimulus (US) was a human scream. In one tonic context (blue light), the CSs were paired with the US, in the other context (yellow light), the CSs were presented unpaired. Following acquisition, an extinction series was run with the US omitted during both tonic contexts. Phasic vasomotor and skin conductance reactions differed in the positive and negative tonic segments (stronger in positive). The skin conductance responses also differed during extinction, but the vasomotor responses did not. Tonic differences (following onset of the tonic stimuli) in unelicited skin conductance response frequency, finger pulse volume, and heart rate were also found, although these developed more slowly than the phasic differences. The finger pulse volume tonic difference was greater in extinction than the skin conductance response frequency. There was no effect of the angry-friendly facial expressions, either directly or in interaction with the transswitching effects. The results were interpreted to mean that the transswitching phenomenon is not limited to one another autonomic effector, but is more generalized across the ANS (sympathetic branch). The absence of influence of the facial expressions indicates the relative weakness of the "preparedness" hypothesis in comparison with more influential contextual factors.

Adult↗