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Biomedical subjects

S K Lechner

Publications and source records attributed to S K Lechner.

27 records · Page 2Linked to original sources
PubMed1984

Processing changes in maxillary complete dentures.

A technique that allows for comparison of undercuts palatal thickness, and double curing has been described for measurement of curing changes in acrylic resin dentures. The technique involves a precision cast and denture positioner in front of the x-ray tube and the transfer of a lead foil strip from cast to denture. Radiographs made of this strip are projected at X20 magnification, and subsequent tracings are measured and superimposed to note shrinkage and contour changes.

Acrylic Resins↗
PubMedDate not supplied

Maxillary changes under complete dentures opposing mandibular implant-supported fixed prostheses.

PURPOSE: The aim of this study was to determine whether a condition similar to Combination Syndrome occurs in patients rehabilitated with a maxillary complete denture opposing a mandibular implant-supported fixed prosthesis. MATERIALS AND METHODS: Standardized clinical procedures measured fit, occlusal integrity, and bone loss in the anterior maxilla in 11 edentulous subjects meeting these requirements, from the patient pool of the Implant Centre, United Dental Hospital, Sydney. RESULTS: A mean annual loss of 0.17 mm in the anterior maxillary ridge height was not statistically significant (P > 0.05). However, increased pressure in the anterior maxillary ridge during occlusion and loss of posterior occlusal contacts in retruded position were noted on one or both sides in all subjects. CONCLUSION: Loss of posterior occlusion could not be related to anterior maxillary bone loss. However, to maintain the integrity of the prostheses and their supporting structures, it is important to schedule periodic recall appointments for review of the occlusion.

Aged↗
PubMedDate not supplied

Imaging for predictable maxillary implants.

Whereas other radiographs may be adequate for assessment of mandibular anterior implant sites, the use of computerised tomography is recommended for evaluating potential implant sites in the maxillae. A complete denture replica with appropriate radiopaque markers aids in the assessment. Hounsfield densitometric measurements provide additional information on the quality of available bone.

Dental Implantation, Endosseous↗
PubMedDate not supplied

Combination syndrome in relation to osseointegrated implant-supported overdentures: a survey.

Thirteen patients who had worn a maxillary conventional denture and mandibular osseointegrated implant-supported overdenture for at least 3 years were evaluated for subjective assessment of fit of the maxillary denture, occlusal integrity, and the status of the anterior maxillary residual ridge. The findings of this study support the view that this combination of prostheses can result in perceived loosening of the maxillary denture, loss of posterior occlusion, increased anterior occlusal pressure, and anterior maxillary bone loss, similar to the effects seen in Combination Syndrome. It is therefore important to ensure that where an implant-supported mandibular overdenture is planned for the edentulous patient, some form of stabilisation of the maxillary arch is also considered.

Adaptation, Psychological↗