ABSTRACT
3D tooth models were virtually restored: flowable composite resin + bulk-fill composite (A), glass ionomer cement + bulk-fill composite (B) or adhesive + bulk-fill composite (C). Polymerization shrinkage and masticatory loads were simulated. All models exhibited the highest stress concentration at the enamel-restoration interfaces. A and C showed similar pattern with lower magnitude in A in comparison to C. B showed lower stress in dentine and C the highest cusps displacement. The use of glass ionomer cement or flowable composite resin in combination with a bulk-fill composite improved the biomechanical behavior of deep class II MO cavities.
Subject(s)
Adhesives/pharmacology , Dental Pulp Cavity/drug effects , Finite Element Analysis , Root Canal Filling Materials/pharmacology , Composite Resins/pharmacology , Dental Restoration Repair , Dental Stress Analysis , Elastic Modulus/drug effects , Glass Ionomer Cements/pharmacology , Humans , Materials Testing , Models, Anatomic , Polymerization , Weight-BearingABSTRACT
OBJECTIVE: Doctor-patient relationship is a very important variable in the oncological clinical consultation. METHODS: We have analyzed 100 outpatients oncological visits (first visits and follow up visits). We conducted an observational study of the extra verbal communication (non-verbal and para-verbal) with a structured observation grid. We have analyzed the three stages of the visit: 1. Patient's admission, 2. Communication flows and 3. Information exchange between doctor and patient. RESULT: In the first visit doctor introduce himself (85%). In the follow-up visit the doctor has received the patient with a handshake (86%) while in the first examination in 100%. In the follow-up visit the short phase of pleasantries was present in 61% of cases, while in the first examination in 45% of cases. Doctor drawn an outline, a design or wrote a note in 45% of first examination and 25% of the follow up. CONCLUSION: Extra verbal communication is more important than the verbal. We suggest useful tips on what "do not" and what "do better" during clinical consultations. CONCLUSION: Against what it is often believed eye contact is not always necessary or useful in establishing a good doctor-patient relationship it depends on the patient's preferred representational system.
Subject(s)
Communication , Physician-Patient Relations , Hospitals, University , Humans , Italy , Patient Education as Topic , PostureABSTRACT
BACKGROUND: Cooperatively-controlled robotic assistance could provide increased positional accuracy and stable and safe tissue targeting tasks during open-skull neurosurgical procedures, which are currently performed free-hand. METHODS: Two enhanced torque-based impedance control approaches, i.e. a variable damping criterion and a force-feedback enhancement control, were proposed in combination with an image-based navigation system. Control systems were evaluated on brain-mimicking phantoms by 13 naive users and 8 neurosurgeons (4 novices and 4 experts). RESULTS: In addition to a 60% reduction of user effort, the combination of the proposed strategies showed comparable performances with respect to state-of-the-art admittance controller, thus satisfying the clinical accuracy requirements (below 1 mm), reducing the hand tremor (by a factor of 10) and the tissue's indentation overshooting (by 80%). CONCLUSION: Although the perceived reliability of the system should be improved, the proposed control was suitable to assist targeting procedures, such as brain cortex stimulation, allowing for accurate, stable and safe contact with soft tissues. Copyright © 2015 John Wiley & Sons, Ltd.
