Conscious SedationAnesthesia, DentalHypnotics and SedativesDeep SedationMidazolamHydroxyzinePropofolPreanesthetic MedicationAnesthetics, IntravenousAnesthesia, LocalDental AnxietyAnesthesia, RectalAlphaprodineAnesthesia, GeneralAnesthesia Recovery PeriodConsciousnessMeperidineChloral HydrateEndoscopy, Digestive SystemDentistry, OperativeBurns, ElectricAnesthesia, IntravenousDiazepamDental ImplantationManifest Anxiety ScaleGastric BalloonDexmedetomidineNitrous OxideEndoscopy, GastrointestinalFentanylTooth ExtractionColonoscopyIntubation, IntratrachealProspective StudiesPatient SatisfactionCholangiopancreatography, Endoscopic RetrogradeBronchoscopyInjections, IntravenousDouble-Blind MethodNeurosurgical ProceduresPainPilot ProjectsTreatment OutcomeOxygenAnxietyEquipment DesignAnalgesiaHeart RateTime Factors