Search PubMed⌕ Search

Biomedical subjects

Shlomo Calderon

Publications and source records attributed to Shlomo Calderon.

10 recordsLinked to original sources
PubMed2006

Detection of cavitated carious lesions in approximal tooth surfaces by ultrasonic caries detector.

OBJECTIVE: A new diagnostic method for detecting cavitated carious lesions in approximal surfaces with the aid of an ultrasonic caries detector (UCD) was tested for clinical use. The objective of this study was to evaluate the efficacy and clinical performance of the UCD system and to compare it with bite-wing radiography by using direct visual inspection during restoration preparation as a validation method. STUDY DESIGN: One hundred ninety-seven directly inspected approximal sites, 95 as cavitated carious lesions and 102 as intact sites, of adults 22 to 45 years of age were examined by UCD and radiography. RESULTS: Ultrasonic caries detector sensitivity was 0.82 compared with 0.75 for bite-wing radiographs when the threshold was determined as radiolucency in inner enamel and dentin, and 0.49 when the threshold of radiolucency was in dentin. The specificity of UCD was 0.75 versus 0.9 for radiographs. CONCLUSIONS: The UCD exhibited a higher sensitivity than the radiographs but a lower specificity. This study presents a new diagnostic tool that can reduce patient exposure to ionizing radiation and improve caries detection.

Adult↗
PubMed2005

Glandular odontogenic cyst: treatment and recurrence.

PURPOSE: To investigate the correlation between clinical characteristics, radiologic features, treatment modalities, and treatment outcome of glandular odontogenic cyst, and to suggest a treatment protocol based on these results. PATIENTS AND METHODS: The study included a total of 56 cases, 49 from the literature and 7 new cases. Demographic data, locularity and radiographic extension, cortical plate integrity, treatment modalities, follow-up, and recurrence were analyzed. RESULTS: There were 34 male and 22 female patients aged 14 to 74 years (mean, 48 years). The mandible was involved in 41 cases (73.2%) and the maxilla in 15 (26.8%), predominantly in the anterior region; 53.6% of the lesions were unilocular and 46.4% multilocular. Large lesions were found in 78.5% of cases. Cortical integrity was compromised in 53.6% (cortical perforation in 39.3% and thinning or erosion of the cortical plate in 14.3%). Recurrence occurred at a rate of 29.2%, within 0.5 to 7 years (mean, 2.9 years). Mean follow-up was also 2.9 years. Two patients had 3 recurrences each. Recurrence was associated with minor surgery such as enucleation or curettage; none of the patients treated by peripheral ostectomy, marginal resection, or partial jaw resection had a recurrence. Compared with the patients without recurrence, the recurrence group had a higher frequency of multilocularity than the nonrecurrent group (64.3% vs 41.2%) and of compromised cortical integrity (71.4% vs 47.1%). CONCLUSION: Glandular odontogenic cyst is an aggressive lesion. Treatment by enucleation or curettage alone is associated with a high recurrence rate. Small unilocular lesions can be treated by enucleation. In large uni- or multilocular lesions, an initial biopsy is recommended. Surgical treatment of large lesions should include enucleation with peripheral ostectomy for unilocular cases and marginal resection or partial jaw resection in multilocular cases. Marsupialization followed by second phase surgery is an option for lesions approaching vital structures. Follow-up should continue for at least 3 years (up to 7 years in cases with features associated with increased risk).

Adolescent↗
PubMed2005

The use of molecular markers as an aid in the diagnosis of glandular odontogenic cyst.

UNLABELLED: (1) To investigate the use of p53, Ki67, and PCNA as an aid in the diagnosis of glandular odontogenic cyst (GOC); (2) To compare the expression of these markers in GOC, low-grade mucoepidermoid carcinoma (MEPCa), and radicular cyst with mucous metaplasia (RCM) as an aid in the differential diagnosis; (3) To establish guidelines for the diagnosis of GOC. STUDY GROUP: 35 patients: 10 GOC, 15 RCM, 9 MEPCa. Immunostaining of archival specimens for p53, Ki67, PCNA. Twenty-nine articles (1987-2004) with detailed histopathological descriptions of GOC, analyzed for frequency of histopathological characteristics. Mean p53 labeling index (LI) was higher in GOC (3.0+/-4.3%) and MEPCa (4.9+/-7.4%) than in RCM (0.4+/-1.2%, p=0.048). Ki67 LI was higher in GOC (4.4+/-4.7%) and RCM (3.7+/-6.7%) than in MEPCa (0.7+/-1.6%, p=0.03). There were no significant differences in the expression of PCNA. In the literature, the most consistent histopathological characteristics of GOC included epithelial spherules/"knobs"/whorls (82.8%), cuboidal eosinophilic cells (65.5%), goblet cells (65.5%), intraepithelial glandular/microcystic ducts (58.6%), variations in lining width (55.2%), ciliated cells (51.7%) and mucous pools/mucous-lined crypts (41.4%). These histopathological features were divided into major and minor signs. The diagnosis of GOC should be based on at least the focal presence of the major signs. Measurement of p53 and Ki67 may aid in the differential diagnosis of GOC.

Adult↗
PubMed2005

Adenoid cystic carcinoma of the salivary glands: a 20-year review with long-term follow-up.

The behavior of adenoid cystic carcinoma (ACC) of the salivary glands has been shown to be unpredictable in terms of local and distant spread and mortality. We retrospectively studied 35 operations in 34 patients who had had a pathologic diagnosis of ACC of the salivary glands and who had been treated over a 20-year period and followed for a minimum of 10 years. We analyzed the effect that different factors had on outcomes. The site of origin appeared to be an important factor in survival rates; survival among patients with tumors that had originated in the parotid gland was fairly good, while survival among those with tumors that originated in the minor salivary glands was significantly worse. TNM staging was another significant factor in survival. Other poor prognostic indicators were local spread, nodal positivity, distant metastasis, and local and regional recurrence. Radiation and chemotherapy did not appear to be beneficial for patients with advanced disease. We recommend radical surgery with complete resection for all patients with ACC of the salivary glands and a careful assessment of the neck in patients with minor salivary gland tumors.

Adenoma↗
PubMed2004

Neoplasms associated with paraneoplastic pemphigus: a review with emphasis on non-hematologic malignancy and oral mucosal manifestations.

The review included 163 cases of paraneoplastic pemphigus (PNP) reported between 1990 and 2003, including a new unique case of PNP associated with occult breast cancer and an ovarian cyst of borderline malignancy. Hematologic-related neoplasms or disorders were associated with 84% of the cases, with non-Hodgkin lymphoma (38.6%) as the most frequent, followed by chronic lymphocytic leukemia (18.4%) and Castleman's disease (18.4%). The non-hematologic neoplasms comprised 16% of all cases: epithelial origin-carcinoma (8.6%), mesenchymal origin-sarcoma (6.2%), and malignant melanoma (0.6%). Carcinoma cases comprised 58% of the non-hematologic neoplasms. Carcinoma cases (n = 14) consisted of adenocarcinoma (n = 7), squamous cell carcinoma (n = 2), multiple skin tumors probably basal cell carcinoma (n = 1), and bronchogenic carcinoma (n = 1). Of the 10 (6.2%) sarcoma cases, there was one case each of leiomyosarcoma, liposarcoma, malignant nerve sheath tumor, poorly differentiated sarcoma, reticulum cell sarcoma, dendritic cell sarcoma and inflammatory myofibroblastic tumor. The oral mucosa was involved in all of cases. Isolated oral ulcerations were the first sign in 45% of the cases. Diffuse and persistent oral ulcerations with a progressive course could be a sign of malignancy, either recognized or occult. In the absence of a clear diagnosis, malignancy should be suspected and extensive work-up performed. The full spectrum of signs of PNP may not be present initially. Repeated biopsies, direct and indirect immunofluorescence as well as screening indirect immunofluorescence on murine bladder are required for diagnosis. Clinicians should be highly suspicious when signs and symptoms suggestive of PNP are present in cancer patients, of hematologic and non-hematologic origin.

Adenocarcinoma↗
PubMed2003

Palatal rotation-advancement flap for delayed repair of oroantral fistula: a retrospective evaluation of 63 cases.

OBJECTIVE: To review our 17-year clinical experience with delayed oroantral fistula repair by palatal rotation-advancement flap, and to report its advantages, disadvantages, and complications. STUDY DESIGN: The records of 63 patients with late oroantral fistula treated by palatal rotation-advancement flap from 1984 to 2002 were reviewed. Eleven had undergone unsuccessful closure with a buccal flap. Data recorded were patient age and sex, cause of fistula, signs and symptoms, interval from appearance of fistula to repair, fistula size, radiographic appearance, method of repair, and immediate and late complications. RESULTS: There were 35 women and 28 men aged 21 to 71 years (mean 50.3 years). Surgery was performed 3 months to 20 years after injury (mean 1.8 years). Twenty-four patients had acute maxillary sinusitis and 39 had chronic sinusitis. The main causes of oroantral fistula were extraction of the second and first molars and pathological lesions within the sinus. Average fistula size was 2.3 cm x 1.6 cm. Fifty-one repairs were preceded by Caldwell-Luc operation. All fistulas were successfully closed with the palatal rotation-advancement flap, with minimal complications on long-term follow-up. CONCLUSION: The palatal rotation-advancement flap is recommended for the late repair of oroantral fistula owing to its good vascularization, excellent thickness and tissue bulk, and easy accessibility; it also allows for the maintenance of the vestibular-sulcus depth. It is particularly indicated in cases of unsuccessful buccal flap closure.

Adult↗
PubMed2003

Clear-cell variant of calcifying epithelial odontogenic tumor: clinical and radiographic characteristics.

OBJECTIVES: Clear cells have been reported in approximately 8% of cases of calcifying epithelial odontogenic tumor (CEOT). The purpose of this study was to describe the clinical and radiographic features of clear-cell CEOT (CCEOT). STUDY DESIGN: Eighteen cases of CCEOT were identified by review of the literature from 1958 to 2001, and a new one was added (total 19; 12 central, 7 peripheral). RESULTS: Fourteen tumors (74%) were located in the mandible, with the central lesions favoring the posterior area and the peripheral lesions the anterior-bicuspid area. Radiographic features were as follows: 50% radiolucent, 50% mixed radiolucent-radiopaque; 92% unilocular; 64% well-defined noncorticated borders, 27% well-defined corticated borders, 9% irregular borders. Cortical perforation was common (67%) compared with CEOT without a clear-cell component (6.7%). Recurrence was reported in 17% of the central lesions and none of the peripheral ones. CONCLUSIONS: CCEOT is a distinct variant of CEOT; its high tendency for cortical perforation may indicate a more aggressive behavior.

Adult↗
PubMed2002

Carcinoma cuniculatum of the jaw: a rare variant of oral carcinoma.

Carcinoma cuniculatum is a rare variant of carcinoma usually involving the foot. Only 13 cases have been described in the oral cavity, none of which was in the English-language literature. We describe a 56-year-old man who presented with a soft exophytic mass in the maxillary gingiva, alveolar bone destruction, and loosening of the teeth. Histopathologic study revealed thin papillary projections covered by a thick keratin layer in the superficial areas and multiple, branching keratin-filled crypts surrounded by well-differentiated squamous epithelium with only mild cytologic atypia but frequent mitosis. Immunohistochemistry results of p53 and polymerase chain reaction analyses for human papillomavirus 6, 11, 16, and 18 DNA were negative. The diagnosis was carcinoma cuniculatum of the jaw. The literature on this unusual oral pathosis is reviewed and the diagnostic challenge described. We suggest that carcinoma cuniculatum may sometimes be misdiagnosed as squamous cell carcinoma or verrucous carcinoma and, therefore, might be more prevalent than the small number of published cases implies.

Carcinoma, Verrucous↗
PubMed2002

Lateral neck mass.

Explore the source record for details and available documents.

Adenolymphoma↗