Pre-heated Resin Composite Restoration

Effect Of Repeated Pre-Heating Of Resin Composite Restoration On Its Clinical Performance And Post-Operative Dentin Hypersensitivity "A Randomized Clinical Trial"

this study is conducted to evaluate the post-operative hypersensitivity and clinical performance of preheated resin composite with different number of pre-heating cycles in class II carious lesions compared to resin composite restorations without preheating using Modified US Public Health Service Clinical Criteria (USPHS).

Study Overview

• Status: Completed
• Conditions: The Effect of Preheating Cycles of Resin Composite on Both Hypersensitivity and Clinical Performance
• Intervention / Treatment: Procedure: no pre-heating of resin composite before application; Procedure: Pre-heating of resin composite before application

Detailed Description

1. Scientific Background One of the main problems associated with composite resin restorations is poor adaptation and gap formation between the restorative material and the cavity walls, resulting in the micro-leakage of oral fluids and accumulation of fluids responsible for many problems such as postoperative hypersensitivity, marginal discoloration and recurrent caries.

   Despite of recent developments in dental restorative materials and techniques, postoperative sensitivity following the application of a posterior resin composite restoration is often reported by dentists, as a clinical problem.

   Pre-application warming of dental resin composite restorative materials, is considered one of the modern modifications for the application of resin composite, which reduces viscosity and increases flowability, that in turn secures superior adaptation to the prepared cavity walls.

   Resin composite warming appliances found in the market nowadays, offer multiple choices for preheating either in different temperatures or in the form of the cassettes which could be compatible with different supplied forms from different manufacturers "capsules or syringes". Multiple cycles of preheating for the used composite resin syringe can affect both marginal integrity and mechanical properties of the resin composite according to the number of cycles applied.

   Increasing the temperature of dental resin composite before application can aid in monomer mobility inside its matrix giving high quality of degree of conversion and more highly cross-linked polymeric network. This kind of change of the rheology of the resin composite can aid in decreasing the postoperative hyper-sensitivity.

   However, an intensive review of literature failed to disclose the effect of using resin composite preheated for multiple times with different temperatures on the post-operative hypersensitivity.

2. Statement of the problem Using the same resin composite syringe that previously preheated multiple times in different daily restorative cases, can adversely affect the properties and the performance of the applied resin composite.
3. Hypothesis The null hypothesis is that using resin composite previously preheated for different cycles will not be different in reducing postoperative hypersensitivity, marginal integrity and mechanical properties of the resin composite as without preheating.

D. The sample size calculation

1. primary outcome: This power analysis used marginal integrity after 12 months as the primary outcome. Based upon the results of Kurdi R and Abboud SA (2016); Bulk Fill composite showed 13 cases with (Alpha) score and 4 cases with (Beta) score, respectively. The effect size (w) was 0.53. Using alpha (α) level of (5%) and Beta (β) level of (20%) i.e. power = 80%; the minimum estimated sample size was 28 cases. Sample size was increased to 35 cases to compensate for a drop-out rate of 25% after 12 months. Sample size calculation was performed using G*Power Version 3.1.9.2.
2. secondary outcome: This power analysis used hypersensitivity grades after one day in patient with medium cavity depth as the primary outcome. The effect sizes w1 = (1.4) and w2 = (1.11) were calculated based upon the results of Ragab H (2018). Using alpha (α) level of (5%) and Beta (β) level of (20%) i.e. power = 80%; the minimum estimated sample size was a total of 11 subjects. Sample size was increased to a total of 14 subjects (7 subjects per group) to compensate for a dropout rate of 25%. Sample size calculation was performed using G*Power Version 3.1.9.2

• Study Type: Interventional
• Enrollment (Actual): 105
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Egypt
  • Minia City
    • Minya, Minia City, Egypt, 61511
      • Faculty of Dentistry

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 60 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• 1- Moderate to deep proximal primary carious lesions" Class II" where each patient will have 2 "Class II" cavities on different sides.

  2- Overall good oral hygiene status 3- Patients showing no signs of spontaneous dental or orofacial pain. 4- Selected teeth should not have any signs or symptoms of pulpal and periapical disease.

  5- The selected teeth should have an occlusal contact with natural or crowned antagonist teeth, so that it could be tested for post-operative pain during chewing of food.

  6- The selected teeth should have healthy gingival tissues, without gingival recession or alveolar bone loss.

Exclusion Criteria:

• 1. Patients with a compromised medical history, or had received therapeutic irradiation to the head and neck region.

  2. Acute and chronic systemic diseases, immune-compromised patients. 3. Medical problems preventing the participant from showing up to describe the presence of hypersensitivity 4. Alcoholic and smoker patients. 5. Pregnant or breastfeeding 6. Patients having physical disabilities, or who are unable to brush their teeth 7. Patients who have a history of allergies to any personal oral care product or ingredient, or who are taking anti-inflammatory drugs within the previous month.

  8. Patients taking analgesics that could alter their normal pain perception level.

  9. Medical, psychiatric, or pharmaco-therapeutic histories that might compromise the study protocol including chronic use of ant-inflammatory, analgesic, psychotropic drugs.

  10. Individuals who had sensitive teeth but with one of the following conditions will be excluded from the study, teeth with large restorations, abutment of teeth of removable par¬tial dentures, dental caries, enamel cracks, leakage of fillings or other restorations, cracked teeth, dental pulp lesions, den¬tal abscesses, pulpitis, and atypical facial pain.

  11. Defective restorations that needs replacement for esthetic reasons. 12. Patient with severe periodontitis or severe erosion damage. 13. Patients had participated in a clinical trial within 6 months before commencement of this trial.

  14. Patients unable to return for recall appointment. 15. Previously restored teeth showing secondary caries. 16. Occlusal disturbances or temporo-mandibular joint problems involving gingival recession or alveolar bone loss.

  17. Patients on orthodontic treatment.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Health Services Research
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: No pre-heating "control group"; resin composite is used at room temperature without preheating	Procedure: no pre-heating of resin composite before application; The control group
Active Comparator: 0ne cycle pre-heating; one cycle preheating of resin composite at 68 degree Celsius before application	Procedure: Pre-heating of resin composite before application; the effect of preheating of resin composite before application in class II cavities
Active Comparator: ten cycles pre-heating; ten cycles preheating of resin composite at 68 degree Celsius before application	Procedure: Pre-heating of resin composite before application; the effect of preheating of resin composite before application in class II cavities

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
United States Public Health Service (USPHS) criteria	Clinical performance of the restorations tested for 9 months	9 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Post-Operative Dentin Hypersensitivity	Intensity of postoperative pain measured using a Modified Visual Analogue scale before and after filling for 1 month postoperatively. The score of scale from 0 to 10 where zero has no postoperative sensitivity at all and ten means the worst postoperative sensitivity is felt by the patient.	1 month

Collaborators and Investigators

• Sponsor: Minia University

Study record dates

Study Major Dates

• Study Start (Actual): January 30, 2021
• Primary Completion (Actual): January 30, 2022
• Study Completion (Actual): March 1, 2022

Study Registration Dates

• First Submitted: March 11, 2022
• First Submitted That Met QC Criteria: March 18, 2022
• First Posted (Actual): March 21, 2022

Study Record Updates

• Last Update Posted (Actual): July 28, 2022
• Last Update Submitted That Met QC Criteria: July 25, 2022
• Last Verified: July 1, 2022

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Immune System Diseases; Hypersensitivity
• Other Study ID Numbers: 73-11\9\2022-440

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No