what is an onlay in dentistry

{"cid":"91222712","title":"E Max Material Inlay And Onlay In Dentistry Aesthetic Restoration Long Lasting","imgUrl":"https:\/\/img.chinax.com\/nimg\/f8\/df\/862fb7f1e03d32d149298225f460-200x200-1.jpg","attrs":{"Price":"Market fit","Brand Name":"E-max","Model Number":"Emax Inlay Onlay","Minimum Order Quantity":"No minimum order reguired","Delivery Time":"4 Days In Lab","Place of Origin":"Shenzhen, China","Certification":"ISO","Packaging Details":"custom packaging box","Payment Terms":"Accept T\/T, Paypal.","Supply Ability":"No minimum order reguired","Thickness":"0.5mm, 1mm, 1.5mm, 2mm","Durability":"Long-lasting, Resistant To Wear And Tear","Size":"S, M, L","Biocompatibility":"Hypoallergenic, Non-toxic","Cementation":"Easy To Bond, Secure","Esthetics":"Natural-looking, Aesthetic","Indications":"Restoration Of Damaged Or Decayed Teeth, Replacement Of Old Fillings Or Crowns","Resistance To Fracture":"Strong, Resistant To Breakage","quality":"Stable and consistency","powerful":"Better materials, better technicians"}}

{"cid":"91223434","title":"OEM 0.5mm Dental Glass Ceramics In Dentistry High Strength","imgUrl":"https:\/\/img.chinax.com\/nimg\/b1\/38\/63e40daf02816a77b47a28d58482-200x200-1.jpg","attrs":{"Price":"To be negotiable","Brand Name":"Beaming","Model Number":"C14","Minimum Order Quantity":"1","Delivery Time":"7-15 days","Certification":"CE","Place of Origin":"CHINA","Payment Terms":"T\/T","Supply Ability":"1 pcs 7-15 days","Packaging Details":"Wooden crate","Package":"100pcs\/box,Carton Box,5kgs\/box,50 pcs\/set)","Sample":"Available,free sample","Color":"A1\\A2\\A3\\A4\\B1\\B2\\C1\\C2\\D2\\OM1\\OM2\\OM3","Main ingredients":"Si0 \u2082, Li0 \u2082, ZrO \u2082, K \u2082 O, etc","Oem":"Yes,Available","Warranty":"1 Months","Service":"OEM Accept,24 hours * 365 days","Dimension":"18*15*13mm"}}

{"cid":"91214434","title":"Audental 22 Au73.8% Yellow Dental Ceramic Alloy High Noble Alloys Dentistry","imgUrl":"https:\/\/img.chinax.com\/nimg\/de\/69\/0d0ad7b647daa55bcacbe57512c6-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"Audental","Model Number":"Dental Porcelain Alloy","Minimum Order Quantity":"30g","Delivery Time":"3 days","Certification":"ISO,FDA,CE ,IDENTALLOY CERIFICATE","Place of Origin":"China","Payment Terms":"Negotiable","Supply Ability":"10kg per month","Packaging Details":"Plastic packaging"}}