Comparison of Scanning With and Without Rubber Dam for Overlay Restorations

The use of rubber dam when performing adhesive restorations improves the quality of the treatment. The widespread use of this type of restorations makes it increasingly necessary to use this type of isolation of the operative field. At the same time, the use of CAD/CAM systems in dentistry has recently become more widespread, which means that chairside systems are being used more and more frequently. Given that in indirect restorations it is necessary to place the rubber dam at the time of cementation, it has been proposed to take optical impressions of the preparation with the rubber dam already in place. For this it is necessary to have previous records that are cut out and rescanned. Since there are authors who have described that rescanning can cause defects in the meshes, in this work we try to compare both types of scanning in a specific type of restorations, the overlays. For this purpose, scans of the tooth preparation with and without rubber dam are taken, and a random decision is made on the basis of which scan the restoration is made. Then it is taken to the mouth and the marginal fit, contact points and occlusion of the restoration are evaluated. The results of the group made from the scan without dam are compared with those of the group made from the scan with dam. The two scans of each case are also compared to evaluate the differences.

Study Overview

• Status: Completed
• Conditions: Crowns
• Intervention / Treatment: Device: Rubber dam

Detailed Description

1. Introduction: The use of rubber dam in restorative dentistry is important in order to improve the quality of restorations. The incorporation of CAD/CAD systems has led to an increase in the use of chairside techniques. In this work we intend to study in vivo to what extent the optical impressions obtained with rubber dam are equivalent to those taken without rubber dam. For better standardization, overlay restorations are studied.
2. Aims: To compare overlay restorations obtained from a scan with rubber dam placed versus restorations of the same type obtained with a scan without rubber dam.

3. Material and methods:

   (a) Number of patients to be treated: 30. b) Number of visits per patient: 1 c) Brief description of the different techniques used in the study, authorized and validated in the literature (3-5 lines). The use of overlay restorations is widely validated in the literature. In the digital era, rubber dam and non-rubber dam impressions are described in the literature and are used interchangeably. As there is no clinical evidence that both techniques have the same clinical efficacy, we decided to perform this in vivo comparison study.

   d) Benefits and harms for the patient of participating in the study (3-5 lines). Participation in the study does not involve any harm to the patient. It is all performed in the same working time, with identical materials and identical clinical technique. It does not bring any particular benefit to the patient. It is explained to the patient that his/her participation contributes to the improvement of scientific knowledge without physical, economic or material cost.

   e) Alternative treatment in case the patient does not wish to participate in the clinical study (3-5 lines). The same treatment is given whether the patient participates or not. The patient is informed that an overlay is required, the possible complications of this treatment are explained to him/her, and if he/she accepts, he/she is asked if he/she would object to participate in the study. Participation involves consenting to the analysis of the scans and the final evaluation of the restoration.

   f) Treatment to be carried out in the event of complications arising in the patient, once the clinical study has begun (3-5 lines). The clinical study is performed in a single visit and is independent of possible complications of the restoration or the tooth.

   g) Material necessary to carry out the study (3-5 lines). Intraoral anesthesia, milling burs, a Primescan intraoral scanner, rubber dam, W8A clamp, two-step adhesive, 5% hydrofluoric acid, silane, clamp holder, dam drill, glycerin are required. No specific material is required for the study with respect to that required for a patient who does not wish to participate in the study.

4. Evaluation of experimental and statistical results (3 lines). The sample was calculated by means of G power 3 version 3.1.9 software, 80% power and alpha=0.05. A sample of 30 was determined. The Kappa index will be used to evaluate the concordance between the two evaluators, interpreting the results with the Landis and Koch concordance table. Pearson's test will be used to evaluate the fit, occlusal contacts, interproximal contact points and choice of the best impression.

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Spain
  • Barcelona
    • Sant Cugat del Vallés, Barcelona, Spain, 08195
      • Clinica Universitaria d'Odontologia

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Need of an overlay restoration

Exclusion Criteria:

• No need of overlay restoration

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Before rubber dam; Impression taken before rubber dam placement is used for crown manufacturing	Device: Rubber dam; Intraoral impressions can be taken with rubber dam in place. The care provider will take two impressions, one with the rubber dam in place and one without. The investigator will randomly chose one of the two impressions for crown manufacturing, and the crown will be delivered by the care provider blindly
Experimental: After rubber dam; Impression taken after rubber dam placement is used for crown manufacturing	Device: Rubber dam; Intraoral impressions can be taken with rubber dam in place. The care provider will take two impressions, one with the rubber dam in place and one without. The investigator will randomly chose one of the two impressions for crown manufacturing, and the crown will be delivered by the care provider blindly

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
overall result of final crown	The final crown is judged by the care provider. A 10 cm Visual analogue scale (VAS) is used. 0 (unacceptable) is placed in left end, and 10 (perfect) is placed in the right end.	One day
Marginal fit of final crown	Marginal fit will be assessed with an exploratory probe under x3.50 magnification, observing the existence of marginal fit in mesial, distal, buccal, and lingual surfaces. The probe used will be a #23/6 explorer which measures 0.22 mm at 1 mm from the tip. A score of 0 (no perception of the gap when probing), 1 (tip of the probe slightly entered the gap), and 2 (the tip clearly entered the gap) will be used	One day
Contact points fit	Interproximal contact points will be assessed with waxed dental floss. A score of 0 (incorrect contact point), 1 (correct contact point) will be used	One day
Occlusal adjustment	Occlusal contacts will be verified with Bausch Arti-Check Micro-Thin 40μ articulating paper and Arti-Fol Metallic Shimstock-Film 12 μ. A score of 0 (no occlusal contacts), 1 (correct occlusal contacts) and 2 (too high occlusal contacts) will be used.	One day

Collaborators and Investigators

• Sponsor: Universitat Internacional de Catalunya
• Investigators: Principal Investigator: José Espona, DDS, Universidad Internacional de Catalunya

Publications and helpful links

General Publications

• Henarejos-Domingo V, Clavijo V, Blasi A, Madeira S, Roig M. Digital scanning under rubber dam: An innovative method for making definitive impressions in fixed prosthodontics. J Esthet Restor Dent. 2021 Oct;33(7):976-981. doi: 10.1111/jerd.12787. Epub 2021 May 18.

Study record dates

Study Major Dates

• Study Start (Actual): January 30, 2023
• Primary Completion (Actual): March 5, 2023
• Study Completion (Actual): March 5, 2023

Study Registration Dates

• First Submitted: January 29, 2023
• First Submitted That Met QC Criteria: February 9, 2023
• First Posted (Actual): February 21, 2023

Study Record Updates

• Last Update Posted (Estimate): March 7, 2023
• Last Update Submitted That Met QC Criteria: March 5, 2023
• Last Verified: March 1, 2023

More Information

Terms related to this study

• Other Study ID Numbers: REST-ECL-2023-01

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: All data will be published

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