Single-retainer Lithium Di-silicate Versus Zirconia Resin Bonded Bridge for Replacement of an Anterior Missing Tooth.

Examination and diagnosis: Selection and examination of the patients according to inclusion and exclusion criteria. Diagnosis of the patient's chief complaint and teeth that will be involved in this study will be done.

Primary alginate impressions for diagnosis on primary casts and for mounting. The patients will be asked to maintain good oral hygiene measures by using tooth brush twice daily.

Taking a professional pre-operative photo.

Tooth preparation procedure:

• Preparation of abutment tooth for Resin bonded fixed partial denture according to specific standardized design for both types of final restorations.
• After tooth preparation, the final impression will be taken for each participant using the intraoral scanner.
• Fabrication of temporary restoration using composite resin temporary material and cemented using Zinc Oxide eugenol free temporary cement.

Fabrication of final restoration:

Lithium Di-silicate or Zirconia Resin bonded fixed partial denture will be fabricated according to group.

Clinical assessment and survival evaluation of the final restoration on delivery and on follow-up every 12 weeks for 12 months following outcome measures.

Inclusion criteria

• All subjects are required to be:

• From 15-50 years old, to be able to read and sign the informed consent document.
• Have no active periodontal or pulpal diseases.
• Psychologically and physically able to withstand conventional dental procedures
• Maintenance of good oral hygiene.
• Able to return for follow-up examinations and evaluation
• Patients have missing upper incisor tooth.

Exclusion criteria

• Patient less than 15 or more than 50 years old
• Patient with active resistant periodontal diseases
• Patients with poor oral hygiene and uncooperative patients
• Pregnant women
• Patients in the growth stage with partially erupted teeth
• Psychiatric problems or unrealistic expectations
• Lack of opposing dentition in the area of interest
• More than one missing tooth in the area of interest