Publications by authors named "S Lettner"
Background: Large variation in the prevalence of ankylosis and replacement resorption (ARR) is reported in the literature and most studies have relatively small patient numbers. The present retrospective study aimed to provide an overview on prevalence, location of, and associated risk factors with ARR based on a large sample of computed tomography (CT) / cone beam computed tomography (CBCT) scans of impacted teeth. The results should allow clinicians to better estimate the risk of ARR at impacted teeth.
View Article and Find Full Text PDFArticle Synopsis
- Platelet-rich fibrin (PRF) is used to promote healing, but its effectiveness in a standard bone regeneration model involving rats is under examination.
- In the study, collagen membranes soaked with either rat or human PRF were applied to 5 mm bone defects in rats, showing that rat PRF led to significant new bone formation compared to human PRF.
- Results indicated that while rat PRF effectively promoted bone regeneration, human PRF showed limited effectiveness in this model, highlighting the need for cautious interpretation when applying findings from rat studies to human contexts.
Objectives: Temporary anchorage devices (TADs) have become an integral part of comprehensive orthodontic treatments. This study evaluated the transfer accuracy of three-dimensional (3D) printed and computer-aided design/computer-aided manufacturing (CAD/CAM) milled surgical guides for orthodontic TADs using micro-computed tomography (CT) imaging in a preclinical trial.
Methods: Overall, 30 surgical guides were used to place TADs into typodonts; 3D printing and CAD/CAM milling were used to produce the guides.
Objectives: Part 1 of this study investigates the influence of zirconia types, chimney heights, and gingival heights on the strength of the zirconia-abutment-interface. Part 2 extends the analysis to include adhesive brands and macro-retentions.
Methods: In Part 1, the study utilized three zirconia types (700 MPa, 1000 MPa, 1200 MPa) to fabricate 234 screw-retained zirconia crowns with varying chimney heights (3.
Bio-Gide is a collagen membrane routinely used in guided bone regeneration. Recent studies have shown that this collagen membrane has osteoconductive properties, meaning that it can support the growth of new bone. However, it has also been observed that the collagen membrane has areas of mineralized fibers which can occur spontaneously and independently of osteoblasts.
View Article and Find Full Text PDF