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Clinical Evaluation of Different Pre-impression Preparation Procedures of Dental Arch.

Arora N, Arora M, Gupta N, Agarwal M, Verma R, Rathod P - J Int Oral Health (2015)

Bottom Line: Bubbles and voids on the occlusal surface impede the actual intercuspation and pre-impression preparation aims to reduce the incidence of air bubbles and voids as well as influences the quality of occlusal reproduction and actual clinical intercuspation in the articulator.Mann-Whitney U-test was applied to find the significant difference between different groups.Least bubbles were found in the group in which oral cavity was dried by saliva ejector and fluid hydrocolloid was finger painted onto the occlusal surfaces immediately before the placement of impression tray in the mouth.

View Article: PubMed Central - PubMed

Affiliation: Reader, Department of Orthodontics and Dentofacial Orthopaedics, Manav Rachna Dental College, Faridabad, Haryana, India.

ABSTRACT

Background: Bubbles and voids on the occlusal surface impede the actual intercuspation and pre-impression preparation aims to reduce the incidence of air bubbles and voids as well as influences the quality of occlusal reproduction and actual clinical intercuspation in the articulator. The study was undertaken to determine the influence of different pre-impression preparation procedures of antagonistic dental arch on the quality of the occlusal reproduction of the teeth in irreversible hydrocolloid impressions and to determine most reliable pre-impression preparation method to reduce the incidence of air bubbles.

Materials and methods: A total of 20 subjects were selected having full complement of mandibular teeth from second molar to second molar with well demarcated cusp height. 200 impressions were made with irreversible hydrocolloid material. The impressions were divided into five groups of 40 impressions each and each group had one specific type of pre-impression preparation. All the impressions were poured in die stone. A stereomicroscope with graduated eyepiece was used to count the number of bubbles on the occlusal surface of premolars and molars. The mean and standard deviations were calculated for each group. Mann-Whitney U-test was applied to find the significant difference between different groups.

Results: Least bubbles were found in the group in which oral cavity was dried by saliva ejector and fluid hydrocolloid was finger painted onto the occlusal surfaces immediately before the placement of impression tray in the mouth.

Conclusion: It was found that finger painting the tooth surfaces with fluid hydrocolloid immediately before the placement of loaded impression tray in the mouth was the most reliable method. The oral cavity can be cleared more easily of excess saliva by vacuum suction rather than by use of an astringent solution.

No MeSH data available.


Finger painting occlusal surface with fluid irreversible hydrcolloid before seating loaded impression tray.
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Figure 1: Finger painting occlusal surface with fluid irreversible hydrcolloid before seating loaded impression tray.

Mentions: Pre-impression preparation was divided into five groups. In Group I, the oral cavity was dried by saliva ejector and fluid hydrocolloid was finger painted onto the occlusal surfaces immediately before the impression tray was placed in the mouth (Figure 1). In Group II, the fluid hydrocolloid in the impression tray was smoothed with a wet finger. In Group III, the oral cavity was not dried before the impression and the fluid hydrocolloid was finger painted onto the occlusal surfaces as done for Group I. In Group IV, the patient rinsed mouth with an astringent mouth wash followed by a water rinse before the impression. Group V was the control group in which the oral cavity was not dried and the impression was made directly without any painting or smoothing of the hydrocolloid.


Clinical Evaluation of Different Pre-impression Preparation Procedures of Dental Arch.

Arora N, Arora M, Gupta N, Agarwal M, Verma R, Rathod P - J Int Oral Health (2015)

Finger painting occlusal surface with fluid irreversible hydrcolloid before seating loaded impression tray.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4513782&req=5

Figure 1: Finger painting occlusal surface with fluid irreversible hydrcolloid before seating loaded impression tray.
Mentions: Pre-impression preparation was divided into five groups. In Group I, the oral cavity was dried by saliva ejector and fluid hydrocolloid was finger painted onto the occlusal surfaces immediately before the impression tray was placed in the mouth (Figure 1). In Group II, the fluid hydrocolloid in the impression tray was smoothed with a wet finger. In Group III, the oral cavity was not dried before the impression and the fluid hydrocolloid was finger painted onto the occlusal surfaces as done for Group I. In Group IV, the patient rinsed mouth with an astringent mouth wash followed by a water rinse before the impression. Group V was the control group in which the oral cavity was not dried and the impression was made directly without any painting or smoothing of the hydrocolloid.

Bottom Line: Bubbles and voids on the occlusal surface impede the actual intercuspation and pre-impression preparation aims to reduce the incidence of air bubbles and voids as well as influences the quality of occlusal reproduction and actual clinical intercuspation in the articulator.Mann-Whitney U-test was applied to find the significant difference between different groups.Least bubbles were found in the group in which oral cavity was dried by saliva ejector and fluid hydrocolloid was finger painted onto the occlusal surfaces immediately before the placement of impression tray in the mouth.

View Article: PubMed Central - PubMed

Affiliation: Reader, Department of Orthodontics and Dentofacial Orthopaedics, Manav Rachna Dental College, Faridabad, Haryana, India.

ABSTRACT

Background: Bubbles and voids on the occlusal surface impede the actual intercuspation and pre-impression preparation aims to reduce the incidence of air bubbles and voids as well as influences the quality of occlusal reproduction and actual clinical intercuspation in the articulator. The study was undertaken to determine the influence of different pre-impression preparation procedures of antagonistic dental arch on the quality of the occlusal reproduction of the teeth in irreversible hydrocolloid impressions and to determine most reliable pre-impression preparation method to reduce the incidence of air bubbles.

Materials and methods: A total of 20 subjects were selected having full complement of mandibular teeth from second molar to second molar with well demarcated cusp height. 200 impressions were made with irreversible hydrocolloid material. The impressions were divided into five groups of 40 impressions each and each group had one specific type of pre-impression preparation. All the impressions were poured in die stone. A stereomicroscope with graduated eyepiece was used to count the number of bubbles on the occlusal surface of premolars and molars. The mean and standard deviations were calculated for each group. Mann-Whitney U-test was applied to find the significant difference between different groups.

Results: Least bubbles were found in the group in which oral cavity was dried by saliva ejector and fluid hydrocolloid was finger painted onto the occlusal surfaces immediately before the placement of impression tray in the mouth.

Conclusion: It was found that finger painting the tooth surfaces with fluid hydrocolloid immediately before the placement of loaded impression tray in the mouth was the most reliable method. The oral cavity can be cleared more easily of excess saliva by vacuum suction rather than by use of an astringent solution.

No MeSH data available.