Endocrowns as Permanent Restorations for Endodontically Treated Permanent Molars in Young Age: Two-Year Follow up

Endodontic treatment will be done for all patients using ProTaper Next rotary files and iRoot SP sealer. Then patients were randomly divided into two groups;

Gr 1: Conventional group (CG), the coronal cavity will be restored directly with bulk-fill nanohybrid composite restorations.

Gr 2: Endocrown group (EG), the coronal cavity will be restored with IPS e.max CAD endocrown restorations.

• First step: Endodontic treatment protocol will be used as the following:

• Biomechanical preparation using; 2.6% NaOCl for irrigation, ProTaper Next rotary files for instrumentation and 17% EDTA gel for lubrication.
• Obturation of root canal using; ProTaper gutta-percha and iRoot SP sealer.
• Second step: Endocrown restoration protocol will be used as the following:

• Occlusal Butt joint design for Endocrown preparation.
• Putty-wash technique for taking impression.
• IPS e.max CAD for Endocrown construction.
• G-CEM self-adhesive resin cement for Endocrown cementation.
• Follow up visits: The patients will be recalled every 6 months for evaluation.
• Evaluation methods:

• Endodontic treatment evaluation: The outcome will be evaluated clinically and radiographically.
• Endocrown restoration evaluation: The outcome will be evaluated clinically in terms of; marginal adaptation, marginal discoloration and surface alteration.

Inclusion criteria

• Patients were systemic free.
• Mature lower permanent first molar needs conventional endodontic treatment.
• The remaining coronal tooth structure after endodontic treatment is not less than 50%.
• Presence of teeth in opposite arch with normal occlusion.
• Absence of para-functional habits.
• Supra-gingival margin after preparation.
• No known allergies.
• Complaint patient (parent/ guardians)

Exclusion criteria

• Immature lower permanent first molar.
• Presence of teeth, whose coronal anatomy does not allow use of rubber dam for optimum bonding.
• Lack of cooperation of the patients to perform a postoperative radiograph and use a rubber dam for bonding.