Analysis of stress on mucosa and basal bone underlying complete dentures with different reliner material thicknesses: a three-dimensional finite element study.

The aim of this study was to determine the optimal thickness of reliner material that provides the least amount of stress on thin mucosa and supporting bone in patients with complete removable dentures using a three-dimensional finite element analyses. The model was obtained from two CT scans of edentulous mandibles with dentures supported by the alveolar ridge. After virtual reconstruction, the three-dimensional models were exported to the solidworks cad software and divided into six groups based on the thickness of the reliner material as follows: (i) without material, (ii) 0·5 mm, (iii) 1 mm, (iv) 1·5 mm, (v) 2 mm and (vi) 2·5 mm. The applied load was 60 N and perpendicular to the long axis of the alveolar ridge of all the prosthetic teeth, and the mucosal thickness used was 1 mm. The analyses were based on the maximum principal stress in the fibromucosa and the minimum principal stress in the basal bone. Stress concentration was observed in the anterior zone of the mandible in the mucosa and in the bone. The maximum and minimum principal stress in the mucosa and bone, respectively, decreased, whereas the thickness of the reliner material increased until 2 mm, which transmitted the lowest stress, compared with the control. Reliner materials with a thickness of 2·5 mm showed higher stress values than those with a thickness of 2 mm. In conclusion, reliner material with a thickness of 2 mm transmitted the lowest amount of stress to the mucosa and bone in 1 mm of mucosa thickness.

Collarless metal ceramic fixed partial denture: a clinical report.

A case of a collarless metal ceramic fixed partial denture with preparations made at a slightly supragingival level is reported. The absence of the metal collar in the buccal portion of the abutments provides an excellent esthetic appearance. The use of a collarless metal ceramic fixed partial denture is a viable approach for restoring dentition where the esthetic quality is the primary concern.

Acromegaly and intestinal neoplasms.

Acromegalic subjects show increased frequency of neoplastic lesions in the colon and rectum with respect to the general population. Recent prospective studies using colonoscopy have shown a 3 time higher prevalence of intestinal polyps and up to 4 time increased presence of colorectal cancer in acromegaly, independently of sex, age, duration of disease and clinical status of the patients. The polyps are distributed throughout the extension of the large bowel and are often multiple, showing at least two different histologic types: hyperplastic and adenomatous. Sometimes they are associated with intestinal carcinomas. Pancolonoscopy is the procedure of choice for the diagnosis of large bowel neoplasms, even though it may be difficult to complete in these subjects because of the frequent presence of an enlarged and elongated colon. It shows a higher sensitivity and specificity compared to other tests such as the barium enema, fecal occult blood test and serum levels of carcinoembryonic antigen. Therefore, it is recommended to follow up acromegalic patients using pancolonoscopy to obtain early detection of neoplastic lesions in the large bowel.

Acromegaly and intestinal neoplasms.

Acromegalic subjects show increased frequency of neoplastic lesions in the colon and rectum with respect to the general population. Recent prospective studies using colonoscopy have shown a 3 time higher prevalence of intestinal polyps and up to 4 time increased presence of colorectal cancer in acromegaly, independently of sex, age, duration of disease and clinical status of the patients. The polyps are distributed throughout the extension of the large bowel and are often multiple, showing at least two different histologic types: hyperplastic and adenomatous. Sometimes they are associated with intestinal carcinomas. Pancolonoscopy is the procedure of choice for the diagnosis of large bowel neoplasms, even though it may be difficult to complete in these subjects because of the frequent presence of an enlarged and elongated colon. It shows a higher sensitivity and specificity compared to other tests such as the barium enema, fecal occult blood test and serum levels of carcinoembryonic antigen. Therefore, it is recommended to follow up acromegalic patients using pancolonoscopy to obtain early detection of neoplastic lesions in the large bowel.

Anterior esthetic rehabilitation of all-ceramic crowns: a case report.

A patient had a serious esthetic problem: One maxillary central incisor was discolored and the other was malpositioned and fractured. The fabrication of two all-ceramic crowns fulfilled both functional and esthetic objectives.

Combination of conventional fixed partial dentures and a resin-bonded retainer with intraradicular retention and a semirigid connector: a case report.

A case of an anteriorly edentulous patient who was treated with a combination of traditional fixed dentures and a resin-bonded retainer with intraradicular retention joined by a nonrigid connector is presented. This type of treatment permits conservation of dental structure, favoring function and esthetic appearance.

An interocclusal record made of a combination of wax and acrylic resin.

The correct mounting of casts on articulators is a fundamental step in obtaining good clinical results and reducing the time spent in the adjustment of oral prostheses. This procedure for retruded contact mounting of casts, based on a tripod of contacts with a combination of wax and acrylic resin, permits great accuracy in a short period of time.