Introduction of dental CAD / CAM system (Cerec 2 system) and application of In Vitro study for recovery of type II sinus

Date: 31/05/2018 / Author: Mr Hiếu

Introduction of dental CAD / CAM system (Cerec 2 system) and application of In Vitro study for restoration of sinus type II (Journal of Thai Society of Orthopedics, Volume 13 - No. 2/2013, General Assembly Vietnam Pharmaceutical Publishing).

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Summary

The CAD / CAM auto-recovery system (CAD / CAM) can be restored and attached to an appointment, without having to seal, pour the sample as well as Stage performed in Labo. This is a progressive technology applied in dentistry.

The presentation introduces the CAD / CAM system in dentistry (CEREC 2 system) and the application of in vitro type II salvage. Over 20 inlays have been shown to restore the inlay generated from the CEREC 2 system in line with the modified xoag. Calibra (a composite bivalve composite) proved appropriate for this type of restoration. INTRODUCTION TO THE DENTAL CAD-CAM SYSTEM (CEREC 2) AND IN VITRO STUDY OF MICROLEAKAGE AROUND CLASS II RESTORATION Abstract Dental CAD-CAM system has the major advantage of fabricating and placing restorations in one order, without having to go through conventional steps for prosthesis: impression taking, model casting, laboratoray work ... It is considered as one of the most important applications of computer technologies in dentistry. 

The CAD introduces a dental CAD-CAM system (Cerec 2 system) and its application in Class 2 restorations. In vitro microleakage was assessed on 20 Class II inlays. The results of this study show a good application of the restorations and little microleakage.

QUESTION

The development of computers and automated control techniques is the driving force behind the scientific and technological revolution in modern medicine in general and modern dentistry in particular. CAD / CAM technology is rapidly changing the way dentists practice. Especially thanks to the automatic dental restorative treatment, the treatment can be completed in just one appointment.

The first CEREC 2 facility in Vietnam is a facility for high quality dental rehabilitation centers located in the Department of Odonto-Dentistry, Ho Chi Minh City University of Medicine and Pharmacy. Ho Chi Minh City (Ministry of Health). Wishing to apply new technology, find new possibilities and expand the choice for physicians and patients to achieve high quality restorations and shorten treatment time, we conducted Implementation of this project aims to:

Introduction of dental CAD / CAM system (CEREC 2 system) and application for testing inlay, onlay.

2. In vitro comparison of the gingival margin of the test inlay was carried out using two types of Calibra (composite binary composite) and GC Fuji Plus (modified resin-modified glass ionomer cement).

OVERVIEW DOCUMENT

Introduction of some dental CAD / CAM systems

CAD: is the data collection by optical or mechanical marking by direct marking of prepared teeth or from model (inlay, crown ...) made by a doctor or technician and design the shape recovered from the data collected.

CAM is a fabricated part made of porcelain or metal based fabric that has been designed (either optical or mechanical) or based on a model made by a physician or technician. From there it is possible to summarize the dental CAD / CAM systems in the following table:

CEREC system

The system was developed by Mormann and Brandestini from 1980-1987. Later, it was acquired by Siemens in 1988 and started to market as CEREC 1. CEREC is the most widely used and widely used dental CAD system in the world. The first CEREC inlay was fitted to the patient in 1985.

CEREC 1: CEREC 1 was original (1980-1987), CEREC 1 was second (1988) and COS 2.0 software was developed. 1991, CEREC 1 was introduced in 1992.

CEREC 2: With the experience accumulated during the development stages of CEREC 1, in 1994, the CEREC system was completely redesigned as CEREC 2. This system improved both hardware and software. , can produce many types of recovery such as inlay, onlay, veneer, crowns for the front teeth and the rear teeth [29].

System structure CEREC 2 consists of 3 main components:

Data collection (camera), design recovery (software), fabrication recovery (grinding)

The improved CEREC 2 camera has 12 magnifications compared to the CEREC 1 camera with a magnification of 8. Thus, the image captured by the CEREC 2 camera is more detailed than the image captured by the CEREC 1 camera.

The CEREC 2 machining section can be easily grinded in 6 axes (grinding wheel 2, porcelain clamping unit 1, nose 3). Drills of 1-2mm diameters can be used to grind complex structures such as the degree of protrusion, different altitudes of the wall of the sinus, and can be adjusted to the shoreline of the crown and veneer [28]. Grinders are powered by electric motors so speed is almost unchanged even though grinding at different depths. The grinding time for inlay, onlay and crown varies from 5 to 30 minutes depending on grinding type and size.

The Cos 4.31 software was improved in 1999. Depending on the clinical situation, the chewing surface of the inlay can be designed in a variety of ways, particularly the CEREC 2 system that can create a chewable surface recovery. power.

The most frequently studied problems of the CEREC system

Comparisons of the accuracy of systems [27, 29, 42, 44, 45, 46, 47], restoration materials [14, 21, 22, 40.50], cemented systems [23, 37, 43, 48, 52]

Method of assessing the quality of recovery

Clinical evaluation

Use of X-ray film, scanning electron microscope, US public health standard (life of teeth, bleeding index, restoration quality, color, anatomical shape of teeth and recovery) to assess recovery quality. In addition, complications and complaints of patients were also documented [20, 35, 52]

Vitro evaluation

Recovery strategies are evaluated in two ways:

Invasive tooth tissue: the tooth is cut into thin slices or cut through the center of recovery by slow-speed diamond discs of cooled water, and then visually imaging the reconstructed teeth under the microscope. , forty six]

- Non-invasive dental tissue: the teeth and the restoration are intact, assess the entire recovery area from the microscope or evaluate the thickness of the cement attached to the selected points along the recovery glass. Microelectronics sweep [8, 21, 38].

MATERIALS AND METHODS OF RESEARCH

Study Materials

Conducted research on 20 permanent molars of the human, extracted not due to tooth decay or other loss of substance. The teeth are intact, with the tip.

Create a MO inlay and perform the corresponding inlay with the CEREC system. 2. Divide the two groups into 19 groups: group I inlays with Calibra and group II with Fuju Plus. Attach the inlay to the sinus as directed by the manufacturer.

Research facilities

- CEREC system 2

- Material attached / glued

Group I: Calibra (composite bivalent composite) (Dentsply).

Group II: GC Fuji Plus (resin-modified glass ionomer) (GC).

Research Methods

Study design: In vitro studies follow a random parallel cluster design.

Sinus Inlay: The teeth are fixed on the jaw pattern. The MO inlay sinus cavity with the following standards: 2-3mm deep sinus floor, gingival wall and flat wall, the other side is parallel and perpendicular to the gingival wall. The cylinder is flat, not curved by the external shape of the tooth. No bevels in the city.

Create recovery using the CEREC system

* Collected dental data prepared by camera

The inlay was washed and blown dry, scanned and covered with a thin layer of CEREC powder on the entire sinus and adjacent teeth. Inline sinus scan with camera: The angle of view of the camera coincides with the orientation of the inlay, inlay cavity on the screen to ensure the following four criteria: clear, good contrast, visible clearly, neatly in the middle of the screen. .

* Design recovery

The inlay design routine is executed according to the following on-screen instructions: bottom line drawing, automatic surface line design, side contact, midline drawing, next door

* Grinding recovery

Select the porcelain blocks of appropriate size according to the message on the screen to the grinder. Choosing a grinder, the machine starts the grinding process.

Restored teeth are encoded, heat cycled, insulated, dyed, cut and observed by two independent inspectors. The score scale used to observe and assess the level of penetration of the gums in the gingival tissue of restorations is: 0, 1, 2, 3 (according to Ferrari, 1996) [15].

Use SPSS for Windows 9.01 software to process the results and compare the levels of color penetration between the two groups.

RESULTS AND DISCUSSION

Result

Group I: 8 restoration without color penetration, 2 restoration color penetration to the cylinder (degree 3).

Group II: There are 6 restoration of color penetration not exceeding half the length of the gingival (grade 1), 3 restoration of penetration more than half way to gingival (grade 2) and 1 restoration of color penetration into axis (degree 3).

 

Statistical analysis

Using the Mann-Whitney Rankings, there was a statistically significant difference (p = 0.014) of the penetration of the pigments in the two groups. Thus, it can be concluded that shore consolidation of the rest of group I is better than that of group II recovery, which is statistically significant (p = 0.014).

Discuss

Technically CEREC

* Advantages of CEREC system

This study uses the CEREC 2 system as an improved system since 1994. In addition to improvements in hardware such as the camera, grinding parts; The Cos 4.31 software was also improved in 1999. The CEREC 2 system allows for the creation of many types of restorations such as inlay, onlay, crowns, back teeth and veneer laminates. presence of functional chewing [27].

The CEREC 2 system is fully automated, with fewer patient appointments and less recovery time than the classical system [41]. With this technique, the entire process from preparation of the sinus to restoration is done in one appointment, ignoring stages such as sealing, pouring, temporary restoration, as well as phases in the lab.

Another advantage of the CEREC leaf system can be used indirectly.

* The limitations and difficulties of the CEREC system

High initial investment cost. Duration of training is 2 days. Dentists participating in the training must use the camera and evaluate each step of the design [30].

The color of the porcelain blocks is limited, but this problem is easily overcome thanks to the color set of CEREC porcelain system. The sets of color dots allow the color to be unique for each recovery within a 20 minute period.

About the research results

Research results show that CEREC inlay with Calibra is effective in inhibiting microcrystalline formation (80% of good quality - no interference), CEREC InLine cemented with GC Fuji Plus. It is possible to notice that CEREC inlay is of a reliable quality, especially when using sticking / attaching materials. In practice, the CER inlay has a very high conjugation rate and this may yield clinically significant results.

In the 1990s, Mormann's research suggested that the use of composite photosensitive (Heliomoler) to affix the CEREC inlay had good results. The CERC composite inlay with composite bicarbonate had better results than previous generations of composites. Coagulation is easily hardened in areas of the sinus where the polymerization light can not reach.

In the 2001 study, the relative strengths of cement, glass, ionomer, resin-modified glass ionomer, composite bicarbonate on total porosity recovered from CAD / CAM systems, The ionomer is not suitable for fixing porcelain restoration of the CAD / CAM system, the composite binary composite has the best bonding strength [12].

In 1997, in a comparative study of the paste strength of glass ionomer cement and cement resin-modified glass ionomer for porcelain restorations, Vallitu and Fors concluded that the high shear adhesion rate in the glass cement group ionomer, while there was no abrasion in the cement-treated resin-modified glass ionomer cemented group [51].

In 1998, Zueling-Singer-R and Bryant-RW conducted a study of shoreline compliance of inlay remediation made from the CEREC system for three years using composite materials: composite hybrids, granular composite hybrids, ionomer glass cement. The study concluded that the edge of CEREC inlay is highly consistent and stable for 3 years. Composite composite resins have better abrasion resistance than composite hybrids and glass ionomer [52].

The study by Zodiac and Tung Hung (1999) compared the gingival margin of the SONICSYS inlay with the liquid polymer composite and the ionomer glass ionomer hybridization. The study concludes that ceramic composite inlay is significantly better than glass ionomer cement [2].

In an in vitro study using heat-cycling and mechanical stress, Reich and colleagues found that there was a corresponding increase in cemented inlay-composite cement thickness while no correlation was found in CEREC inlay. However, in an in vitro study of the quality of the gingival surface of CEREC type II (1995), two criteria were used: the integrity of the restoration surface (analyzed electronically Before and after heat cycles, mechanical stresses) and the durability of the restoration (observation of color penetration after thermal cycles and mechanical stress), Schmalz et al. affected by the thickness of the material attached.

With the thickness of the material attached to 100 Mm, the failure of sticking / pasting is low from 3% -14%. The thickness of the mounting material is greater than 100 Mm, the offset of the composite is not fully fitted [38].

In summary, it can be seen that the main factor affecting the resurfacing quality is the choice of attaching material, which facilitates close recovery between the restorative and dental tissues. Investigations on a variety of materials, the authors have come to the conclusion that composite bivalves, which are used as the binding material for CEREC recovery, are more effective than hybrid materials and cement ionomer glass.

Practical meaning and clinical application

The CEREC 2 system is an automated system of various types of dental restorations. Many lab and clinical evaluation studies have confirmed the recovery of the CEREC system with good aesthetic and functional results [20, 30, 21, 42]. On the other hand, the porcelain system used in CEREC system, especially Vita Blocs Mark II has many good features: easy to grind, easy to polish, aesthetically pleasing, feldspar frame easy to erase for effective paste, compressive strength Highly abrasion-free and non-eroding teeth.

CEREC 2 was first introduced in Vietnam. Through the research and application of this system in the work of inlay, onlay we realize that this is a modern technique but not complicated. Therefore, if trained, dentists can master the technique, perform high-quality restorations on an appointment with this system.

The study uses two different attachment materials: Calibra composite and GC Fuji Plus cement resin-modified glass ionomer. Results showed that shore reconstitution was good in both groups, especially in Group I with the adhesive material Calibra, with no recovery rate of 80%.

Through research and application of CEREC 2 system, we successfully processed inlay, onlay, and verified the suitable cement type. Therefore, the application of CEREC 2 system to make cosmetic restoration quickly, saving time and labor is a feasible and practical solution.

CONCLUDE

1. The dental CAD / CAM system marks a new development in modern dental technology.

2. The CEREC 2 system is equipped with the first dental CAD / CAM system in Vietnam that meets the demand for innovative dentistry in Ho Chi Minh City. modern; which stands out with the role of information technology. These systems require users to have basic computer knowledge and skills.

3. In vitro studies on the recovery of type II sinus inlays showed that:

The degree of gingival margin of the inlay embedded in Calibra composite is significantly less than the inlay applied by GC Fuji Plus (p <0.014).

* The choice of attaching / gluing material to the recovery material: Composite composite systems are more suitable for restoration using CAD / CAM systems. CEREC 2 through this in vitro study.

Practical meaning:

Applying CEREC 2 in the form of inlay, onlay in dentistry is a feasible solution that meets the aesthetic and functional requirements and can complete the treatment during an appointment.

INTRODUCTION TO CLINICAL CLASSES

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