The following will be assessed at baseline (4-8 weeks after insertion), 6 month, then annually from Year 1 to 5, and further at 8, 10 and 15 years: <br>1. Clinical: <br>1.1. Crown/root caries <br>1.2. Abrasion (Index 0-4) <br>1.3. Interdental spacing in the anterior region (Index 0-3) <br>1.4. Sensibility (+/-) <br>1.5. Periodontitis/Gingivitis: Plaque-index (index 0-3), probing depth (6 point measurement in mm), attachment loss (6 point measurement in mm), bleeding on probing (BOP)(+/-), tooth mobility (index 0-3), mucosa lesions (California Dental Association [CDA] Criteria) <br>2. Clinical dysfunction index: Muscle pain via palpation (m. masseter pars profunda et superficialis, m. temporalis pars posterior et anterior, m. pterygoideus medialis et lateralis) <br>3. Range of movement (mm): maximal opening <br>4. TMJ function: Description of pain on movement/path of movement, palpation/auscultation <br>5. Technical (according to the CDA criteria): Treatment performance, preparation form, marginal fit, occlusion static/dynamic in µm, proximal contacts (shape/ strength) <br>6. Technical performance (according to the CDA criteria): Evaluation of used materials, prosthesis and bridge design, saddle extension, possibility of dental hygiene <br><br>Subjective: <br>9. Oral health related quality of life (OHIP-Questionnaire): Measure of self reported dysfunction, discomfort and disability attributed to oral conditions <br>10. Dworkin Index Axis II (questionnaire): Assessment of psychological distress and psychosocial dysfunction including questions regarding: <br>10.1. Graded chronic pain severity <br>10.2. Depression <br>10.3. Vegetative symptoms and somatization subscales of the SCL-90-R developed by Derogatis and others <br>10.4. Jaw disability checklist <br><br>The CDA Criteria are used according to the Guidelines for the Assessment of Clinical Quality and Professional Performance of the California Dental Association: http://www.cda.org/library/cda_member/policy/quality/quality.html