Marginal Integrity and Clinical Evaluation of Polyetheretherketone (PEEK) Versus Lithium Disilicate (E-max) Endocrowns.

Cairo University22 enrolled

Overview

Patients need Endocrowns for their teeth usually use Emax as an etchable ceramic. Yet they have disadvantages that may influence the outcome of the endocrowns, among which is the high stiffness and rigidity owing to the higher modulus of elasticity (67.2 GPa)( compared to natural dentin (18.6 GPa) which may affect the marginal adaptation.so a less rigid material is needed. PEEKs (polyetheretherketones) are presented as alternative materials to metal and glass ceramics, Their elastic modulus comparable to those of cortical bone and dentin so the polymer could exhibit good stress distribution. Also they have high fracture resistance, and low abrasion to the antagonist enamel. .but the investigators have to know clinically it is performance , so the investigators are going to have Parallel groups in a randomized clinical trial.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Endodontically Treated Teeth

Interventions

Eligibility

Sex: ALLMin age: 18 YearsMax age: 60 Years

Medical Language ↔ Plain English

Inclusion Criteria: All subjects are required to be: * From 18-60 years old, and able to read and sign the informed consent document. * Physically and psychologically able to tolerate conventional restorative procedures * Have no active periodontal or pulpal diseases. * Willing to return for follow-up examinations and evaluation Exclusion Criteria: * Patients in the growth stage with partially erupted teeth * Patient with fractured teeth of more than 50% enamel loss * Patients with poor oral hygiene and motivation * Pregnant women * Psychiatric problems or unrealistic expectations * Lack of opposite occluding dentition in the area intended for restoration

Outcomes

Primary Outcomes

evaluation of marginal gap

Marginal gap of the restorations assessed by Silicon replica technique using digital microscope

Time frame: through study completion, an average of 1 year

Secondary Outcomes

Clinical evaluation of marginal adaptation

Marginal adaptation of the restorations assessed clinically using dental mirror and probe according to the modified united states public health service criteria (USPHS)

Time frame: 1 Year

Clinical evaluation of fracture resistance

Fracture resistance of the restorations assessed clinically using dental mirror and probe according to the modified united states public health service criteria (USPHS)