J Korean Acad Prosthodont.  2019 Jul;57(3):304-311. 10.4047/jkap.2019.57.3.304.

Use of digital scan data for evaluation of edentulous ridge relationship: A case report for removable prosthesis with unilateral cross bite

• Kim JH
• Kim JE
• Park YB
• Lee KW

• KMID: 2453786
• DOI: http://doi.org/10.4047/jkap.2019.57.3.304

Abstract

After the teeth were extracted, maxillary and mandibular alveolar ridges show the opposite resorption pattern and as a result, the mandibular arch is enlarged than maxillary arch relatively. In this situation, we should evaluate both alveolar ridge relationship and arrange the artificial teeth properly for stability of removable prosthesis. This case is a 77 years old male patient who wishes to make removable prosthesis and has atrophic alveolar ridge. By use of model scanner and CAD software, the angle between interalveolar crest line and occlusal plane was easily measured. Depending on the measurement, the artificial teeth are arranged in unilateral cross bite and after completion, patient was satisfied with the denture which showed proper stability, retention, support.

Keyword

Digital dentistry; Removable prosthesis; Cross bite

MeSH Terms

Alveolar Process
Dental Occlusion
Dentures
Humans
Male
Malocclusion*
Prostheses and Implants*
Tooth
Tooth, Artificial

Figure

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  Fig. 1 Intraoral examination. (A) with existing prosthesis: Denture teeth wear and denture base resin discoloration, (B) without denture: Alveolar ridge atrophy.

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  Fig. 2 Radiographic examination (Panoramic view): No condylar abnormality and intrabony lesion.

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  Fig. 3 (A) Final impression taking (Maxilla: Polyvinyl siloxane, Mandible: Polyether) for maxillary complete denture and mandibular surveyed crown, working cast and occlusion rim fabrication, (B) Jaw relation record, (C) Working cast mounting.

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  Fig. 4 Working casts scanning. (A) Maxillary and mandibular working cast, (B) Mandibular occlusal rim scan data, (C) Separation of occlusion rim scan data.

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  Fig. 5 Measuring the angle between interalveolar crest line (yellow line : A) and occlusal plane (yellow line : B): Occlusal rim scan data.

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  Fig. 6 Virtual teeth arrangement: Right first and second molar are set in cross bite.

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  Fig. 7 7. (A) Surveyed crown fabrication, (B) Pick up impression for mandibular RPD(Polyvinyl siloxane), (C) Working cast for mandibular RPD, (D) Metal framework and occlusion rim fabrication for jaw relation record.

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  Fig. 8 Teeth arrangement and festooning: Right first and second molar are set in cross bite.

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  Fig. 9 Delivery of surveyed crown and removable prosthesis.

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  Fig. 10 (A) Scanned image of new removable prosthesis, (B) Sectional view of right second premolar: teeth are set in normal bite, (C) Sectional view of right first molar: teeth are set in cross bite. Buccal and palatal cusps show the same level.

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