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Document Type

Original Study

Abstract

Purpose: The current study's objective was to assess the shear bond strength between dental ceramic and recycled cobalt and nickel chromium alloys following various surface treatments. Materials and methods: Seventy-two metal ceramic samples were made and separated into the following categories: Group I:Nickel chromium samples n= 36 and Group II: Cobalt chromium samples n= 36. Each group was divided into 4 subgroups n=9, Subgroup 1: casted from 100% fresh alloy, Subgroup 2: casted from 50% fresh alloy and 50% fragments from first sub group, Subgroup 3: casted from 50% fresh alloy and 50% fragments from second subgroup and subgroup 4: casted from 50% fresh alloy and 50% fragments from third subgroup. Each subgroup was split into three additional divisions (n=3)according to surface treatment, division A: Sandblasting, division B: Metal conditioner and division C: Laser etching. All samples were veneered by porcelain. The universal tasting machine was used to measure the shear bond strength. Results: It was discovered that subgroups 1 and 2 had the highest shear bond strength mean values for Ni/Cr and Co/Cr, respectively. Subgroups 3 and 4 were next in line .Conclusions: for both tested alloys, as the number of recycling times was increased ,the shear bond strength was decreased .All methods of surface treatments had an influence on bonding of porcelain to recycled cobalt chromium and nickel chromium alloys with varying degrees. sandblasting allowed for the most favorable bond strength among all methods of surface treatments followed by metal conditioner, and ERYAG laser respectively.

Keywords

Sandblasting, Metal conditioner, Laser etching

Subject Area

Restorative Dentistry Issue (Removable Prosthodontics, Fixed Prosthodontics, Endodontics, Dental Biomaterials, Operative Dentistry)

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