PMC7275344_01
Images of the canine teeth crown reduction technique. a Left maxillary canine tooth is cut to the level of the incisor teeth using a disc bur. b A 1.5-mm diameter bur removes the pulp and dentin with saline irrigation to prevent thermal injury, and the removed pulp cavity has a larger diameter at the base compared to the cutting surface. c A cotton pellet soaked with a hemostatic agent (dental formocresol; AGSA JAPAN CO., Osaka, Japan) is used to control the bleeding induced by pulpotomy. d A phosphoric acid etchant (CharmEtch 35 HV; DentKist Inc. Gunpo, Gyeonggi-do, Korea) is applied for 20 s for strong adhesion to the filling material. e The cavity is washed with a 5.25% sodium hypochlorite solution with antimicrobial effects and then dried gently with air. f The cavity is filled with calcium hydroxide/iodoform paste (Vitapex, Neo Dental Clinical Co., Tokyo, Japan). g The cavity is filled with glass-ionomer restorative cement (Fuji IX GP; GC Corporation, Tokyo, Japan) according to the manufacturer's protocol. h Complete image of canine tooth crown reduction
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Fig1
AAALAC accredited facility); IACUC number: 14-0034, 15-0297, and 16-0192). Canine teeth reduction was performed with a sterile procedure that reduces the height of the lower canine crowns by exposing the pulp and removing some of the pulp (partial coronal pulpectomy) as well as the placement of direct pulp capping (Fig. 1). Briefly, canine tooth is cut to the level of the incisor teeth using a disc bur.
Images of level of neutrophil during observation periods after canine teeth crown reduction. There are no neutrophilia except R051. The neutrophilia (arrow) with fistula on the attached gingiva are observed around D870 in R051, but it returns to the normal range after left maxillary canine tooth extraction
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Fig2
The level of neutrophil increased around D870 in R051 (Fig. 2).
Images of a fistula due to periapical abscess and alveolectomy of the left canine tooth. a Image after canine teeth crown reduction. b: The glass-ionomer restorative cement (arrow) fell out into the cavity of the left canine tooth. c: Fistula is observed on the attached gingiva. Images b & c were photographed 2 years and 6 months after canine teeth crown reduction. d Buccal alveolectomy is performed before left maxillary canine tooth extraction. f Image after buccal alveolectomy and canine tooth extraction. f Extracted canine tooth that was broken during tooth extraction
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Fig3
The glass-ionomer restorative had fallen out from left the canine tooth, and a fistula with pus on the buccal gingiva above the left maxilla canine tooth was found in R051 at 2 years and 5 months after canine teeth reduction (Fig. 3; A~C). Left maxilla canine tooth extraction was conducted via buccal alveolectomy (Fig. 3; D ~ F).