The use of stainless steel crowns on primary molars

Transcription

1 2010 National Primary Oral Health Conference October Gaylord Palm, Orlando, Florida The use of stainless steel crowns on primary molars Enrique Bimstein Professor of Pediatric Dentistry University of Florida College of Dentistry.

2 The use of SSC on primary molars Goal The participants will become familiar with the basic knowledge and procedures required for the restoration of primary molars with preformed stainless steel crowns.

3 Topics 1. Introduction: crown types, definition, rationale, indications and contraindications. 2. Characteristics, advantages and disadvantages. 3. Clinical procedures: tooth preparation, crown adaptation and cementation. 4. Summary and conclusions.

4 Crown types for primary teeth Cast : Gold crowns Stainless steel: occlusal anatomy trimmed contoured pre-veneered Composite: plastic matrix

5 Cast crowns - gold

6 Cast crowns - gold

7 Cast crowns - gold

8 Stainless steel crowns Preformed metal crowns or stainless steel crowns (SSC) have been in use for about 60 years. SSC are an invaluable restorative material in the treatment of badly decayed primary teeth.

9 Definition of SSC Full coverage metallic, definitive restoration for primary teeth. (Or temporary for permanent teeth)

10 Definition of SSC Is a metal shell with preformed anatomy that can be adapted to the tooth.

11 Rationale for using a SSC Perio health # of visits Time Difficulty Lab required Cost Esthetics Good Several Hours Difficult Yes Expensive Bad Good One Minutes Easy No Cheap Bad

12 Rationale for using a SSC Stainless steel crowns are used to restore primary molars in which the failure of an amalgam or composite restoration is clear in your mind.

13 Rationale for using a SSC The use of SSC is indicated in cases in which the prognosis for long term success of regular restorations is reduced by a high possibility of: a. restoration fracture b. recurrent caries.

14 Indications for using a SSC Extensive caries destruction. An adequate isthmus is difficult to obtain with a small occlusal surface a wide contact and large pulp.

15 Indications for using a SSC Extensive caries destruction. An adequate isthmus is difficult to obtain with a small occlusal surface a wide contact and large pulp.

16 Indications for using a SSC No gingival floor possible for a proximal occlusal restoration Sidney B. Finn: Pediatric Dentistry book

17 Indications for using a SSC Early childhood caries

18 Indications for using a SSC High caries incidence

19 Indications for using a SSC

20 Indications for using a SSC After endodontic treatment Pulpotomy Pulpectomy

21 Indications for using a SSC After endodontic treatment Pulpectomy Pulpotomy A l w a y s?

22 Indications for using a SSC Pulpotomized primary molars can be successfully restored with one surface amalgam if their natural exfoliation is expected within not more than 2 years. Holan et al. Success rate of formocresol pulpotomy in primary molars restores with stainless steel crowns vs amalgam. Pediatr Dent 24:212, 2002.

23 Indications for using a SSC Delopmental abnormalities Enamel hypoplasia Enamel hypoplasia and caries

24 Indications for using a SSC Compliance and behavior?

25 Indications for using a SSC Space maintainer As an abutment for space maintainers or prosthetic appliances.

26 Indications for using a SSC Fractured molars due to trauma Tejani Z, Johnson A, Mason C, Jane Goodman J. Multiple crown-root fractures in primary molars and a suspected subcondylar fracture following trauma: a report of a case. Dental Traumatology 2008; 24:

27 Indications for using a SSC Multi-surface restorations?

28 Indications for using a SSC Preformed metal crowns demonstrate greater longevity and reduced retreatment need compared with (multi-surface) amalgam.

29 Indications for using a SSC The literature demonstrates evidence of a more favorable outcome for SSCs than for amalgam restorations in primary molars requiring multi-surface restorations. 10 Studies, 1.6 to 10 years follow-up failure rates, ranged from 1.9 to 30.3 % for SSCs and 11.6 to 88.7 % for amalgam restorations. Efficacy of preformed metal crowns vs. amalgam restorations in primary molars: a sistematic review. JADA 131:337-43, 2000.

30 Indications for using a SSC One surface restorations Two surface restorations Stainless steel crowns Failure before the age of 8 years 1 st primary molar 2 nd primary molar 70% 32% 75% 71.4% 12.8% 11.0% Dawson et al. ASDC J Dent Child 1981.

31 Multi-surface restorations VS SSC 1. Type of tooth (first vs second molar) 2. Dental age of patient. 3. Caries incidence. 4. Patient s compliance (brushing etc.). 5. Water fluoridation. 6. Bucco-lingual extent of cavity. 7. Other (esthetics, parents compliance, etc.).

32 Contraindications for SSC Primary tooth close to exfoliation

33 Contraindications for SSC 2. Extensive dental caries: a. there is not enough crown structure left. b. the caries (gingival) extent does not allow for adaptation. c. excessive mesial drift.

34 Contraindications for SSC No restorability due to extensive crown destruction

35 Contraindications for SSC No restorability due to caries gingival depth

36 Contraindications for SSC No restorability due to caries gingival depth

37 Contraindications for SSC No restorability due to excessive mesial drift

38 Contraindications for SSC 3. Esthetics.

39 Contraindications for SSC 4. Allergy to nickel Stainless steel crowns (Unitek and Rocky Mountain) crowns composition consist of 17-19% chromium, 9-13% nickel and carbon. Nickel based crowns (Ion Ni-chro from 3M) composition consists of 76% nickel, 8% iron, 0.04 carbon and 0.35% manganese. MS Muthu- N Sivakumar. Pediatric Dentistry. Principles and practice. Elsevier 2009.

40 Contraindications for SSC 4. Allergy to nickel Nickel is one of the most common causes of allergic contact dermatitis and produces more allergic reactions than all other metals combined. There may be a risk of sensitizing patients to nickel with long-term exposure to nickel-containing appliances as in orthodontic therapy. Bass JK, Fine H, Cisneros GJ. Am J Orthod Dentofacial Orthop Mar;103(3):280-5

41 Contraindications for SSC

42 Contraindications for SSC 4. Allergy to nickel (???) Nickel, has its problems with human biochemistry. Children have to start wearing glasses within a few months of receiving the crowns.

43 4. Allergy to nickel (???) If your child becomes cranky and misbehaves after the crowns were placed while previously he had a pleasing personality, check it out. Contraindications for SSC

44 Characteristics of SSC Stainless steel crowns may be with: Occlusal anatomy Trimmed Contoured Crimped? Pre-veneered

45 Characteristics of SSC Occlusal anatomy only (Unitek) They require trimming, contouring and crimping.

46 Characteristics of SSC Oclussal and pre-trimmed (Unitek) Festooned to allow a line parallel to the gingival crest.

47 Characteristics of SSC Oclussal and pre-trimmed (Unitek) Festooned to allow a line parallel to the gingival crest. They require contouring and crimping.

48 Occlusal, pre-trimmed and precontoured: (Ion-Nichro) Characteristics of SSC Some trimming, contouring and crimping may be necessary. When trimmed, re-contouring, crimping and polish are required.

49 Characteristics of SSC 3M Stainless steel ION Ni-Chro Shape Length 3M Stainless steel ION Ni-Chro Cervical constriction

50 Pre-veneered: metal with esthetic facing (NuSmile). Characteristics of SSC Have a resin-composed facing bonded to Occ. and B. surfaces. Expensive, require more tooth reduction, and allow only for minimal crimping.

51 SSC in primary teeth: topics 1. Introduction: crown types, definition, rationale, indications and contraindications. 2. Characteristics, advantages and disadvantages. 3. Clinical procedures: tooth preparation, crown adaptation and cementation. 4. Summary and conclusions.

52 Clinical procedures for SSC Rationale Tooth preparation. Crown selection Crown adaptation. Complications. Cementation. Cleaning

53 Rationale for SSC tooth preparation and adaptation The tooth preparation and crown adaptation of SSC in primary (and permanent) molars is based (among other) on the crown s: Flexibility: easily bent or shaped. Elasticity: the tendency of a body to return to its original shape after it has been stretched.

54 Rationale for SSC tooth preparation and adaptation Preformed metal crowns are flexible and elastic (they snap). The tooth cervical bulge is surrounded by the crown.

55 Rationale for SSC tooth preparation and adaptation

56 Rationale for SSC tooth preparation and adaptation a. do not require the retention features that are incorporated in cavity design of cast crowns. b. obtain their retention from the flexibility and elasticity of the thin, contoured and crimped crown margins, and cementation.

57 Rationale for SSC tooth preparation and adaptation Subgingival depth 1.5 mm C. E. J.

58 Clinical procedures for SSC Rationale Tooth preparation. Crown selection Crown adaptation. Complications. Cementation. Cleaning

59 Check Occlusion before starting tooth reduction.

60 Armamentarium - Burs

61 Armamentarium for adaptation 114 plier Crimping plier Sharp scaler Round scissors

62 Tooth preparation for SSC General considerations Extent. Caries removal. Pulp treatment. Occlusal surface Buccal (1-1.5 mm and reduction) lingual surfaces Proximal surfaces Finish

63 Occlusal preparation (a)

64 Occlusal preparation (a) Create a channel 1.25 mm deep between the cusps.

65 Occlusal preparation (a) Reduce the cusps to the depth of the channel.

66 Occlusal preparation (b)

67 Occlusal preparation (b)

68 Occlusal preparation (b)

69 Tooth preparation for SSC General considerations Depth and extent. Caries removal. Pulp treatment. Occlusal surface Buccal and lingual surfaces Proximal surfaces Finish

70 Buccal and lingual reduction. Prepare a slight bevel, at the occlusal 1/3 portion of the surface.

71 Tooth preparation for SSC Buccal and lingual surfaces a)limited to occlusal 1/3 of the B & L surfaces at a 45º bevel. b)round off all line angles. c)a large mesio-buccal or cervical bulge may require more buccal and lingual reduction.

72 Buccal and lingual reduction. Prepare a slight bevel, at the occlusal 1/3 portion of the surface.

73 Buccal and lingual reduction. Prepare a slight bevel, at the occlusal 1/3 portion of the surface.

74 What s next? Caries removal Pulp therapy (if required) Proximal surfaces Proximal surfaces Caries removal Pulp therapy (if required)

75 Caries removal

76 Apply a liner or perform pulp therapy

77 Finish Tooth preparation for SSC General considerations Depth and extent. Caries removal. Pulp treatment. Occlusal surface Buccal and lingual surfaces Proximal surfaces

78 Tooth preparation for SSC Proximal surfaces a) 169L tapered fissure or thin tapered diamond bur. b) Break proximal contacts at appropriate depth in single sweeping motion (or gradually). c) Vertical proximal walls with slight convergence in an occlusal and lingual/palatal direction. d) Feather-edge finish line; common error: ledge formation.

79 Proximal surfaces

80 Proximal reduction: open the proximal contacts, flat surfaces.

81 Proximal reduction: open the proximal contacts, flat surfaces.

82 Proximal surfaces

83 Proximal surfaces

84 Proximal surfaces

85 Rounding angles.

86 Rounding angles.

87 Clinical procedures for SSC Rationale Tooth preparation. Crown selection Crown adaptation. Complications. Cementation. Cleaning.

88 SSC selection 3M Stainless steel 3M Stainless steel

89 SSC selection General considerations a)place or seat crown from lingual to buccal. b)push crown over the buccal buldge for a snap fit. c)check margins for close cervical adaptation extending mm subgingivally (blanching).

90 SSC selection 1. Choose the crown that fits MD. Select the smallest crown that restores the pre-existing contacts (if present). The most common used crowns are size # 4

91 Too small M-D SSC selection

92 Too big M-D SSC selection

93 SSC selection Radiograph in which crown adaptation is adequate in tooth 64 and inadequate in 65 and 74.

94 SSC selection Crowns which are to big M-D may prevent the adequate eruption of adjacent permanent tooth.

95 Crown adaptation Contour Crimping

96 Crown adaptation 114 Contouring Pliers

97 Crown adaptation Buccal and lingual

98 Crown adaptation Proximal

99 Crown adaptation Proximal

100 Crown adaptation Extra countour

101 Crown adaptation

102 Crown adaptation

103 Crown adaptation Crimping Pliers

104 Crown adaptation Crimping Pliers

105 Crown adaptation Crimping Pliers (extra crimping)

106 Crown adaptation Examine the crown for sharp angles or irregularities. Re- contour and/or re-crimp were necessary

107 Examine the occlusion. The occlusion should be the same before starting the procedure.

108 SSC Cementation and cleaning

109 SSC Cementation and cleaning

110 Complications

111 Additional crown adaptation To crown is too long over the gingiva. no space with antagonist no space interproximal. sharp angles

112 Additional crown adaptation Sharp scaler

113 Additional crown adaptation Crown and Bridge Scissors

114 Additional crown adaptation Crown and Bridge Scissors

115 Additional crown adaptation Polish the crown with a heath less stone.

116 Additional crown adaptation Buccal and lingual surfaces Due to carious proximal contact loss, the crown that fits M-D may be too small B-L; this may be solved with more buccal or lingual reduction.

117 Additional crown adaptation Buccal and lingual surfaces Due to carious proximal contact loss, the crown that fits M-D may be too small B-L; this may be solved with more buccal or lingual reduction.

118 Additional crown adaptation Due to carious proximal contact loss, the crown that fits M-D may be too small B-L; this may be solved with more buccal or lingual reduction.

119 Additional crown adaptation Too high Fits MD but does not cover the buccal surface: modify a larger crown. over the gingiva. no space with antagonist no space interproximal. sharp angles

120 Additional crown adaptation Too high Over the gingiva (or loose). over the gingiva. no space with antagonist no space interproximal. sharp angles Additional contour and/or crimping are required.

121 Additional crown adaptation Howe Plier: to rotate crowns

122 Complications Aspiration

123 Complications Aspiration Adewumi A. Kays DA. Stainless steel crown aspiration during sedation in pediatric dentistry. Pediatr Dent 30:59-62, 2006.

124 Complications Gingival and periodontal diseases

125 Complications: Allergy The nickel content in the formulation of nickel chromium crowns is around 70% greater than that of contemporary stainless steel crowns that contain 9-12% nickel similar to that of many orthodontic band and wires. tistryinfo/stainless-steelcrown

126 Complications: Allergy Pazzini CA, Pereira LJ, Marques LS, Generoso R, de Oliveira G Jr. Allergy to nickel in orthodontic patients: clinical and histopathologic evaluation. Gen Dent Jan-Feb;58(1):58-61 Kolokitha OE, Chatzistavrou E. A severe reaction to ni-containing orthodontic appliances. Exposure to nickel-containing orthodontic appliances may cause intra- or extraoral allergic reactions. Nickel is the most typical antigen implicated in causing allergic contact dermatitis, which is a Type IV delayed hypersensitivity immune response. Angle Orthod Jan;79(1): Bruce GJ, Hall WB. Nickel hypersensitivity-related periodontitis. Compend Contin Educ Dent Feb;16(2):178, 180-4; quiz 186 Ehrnrooth M, Kerosuo H. Face and neck dermatitis from a stainless steel orthodontic appliance. Angle Orthod Nov;79(6):1194-6

127

128 Pre-veneered: metal with esthetic facing have a resin-composed facing bonded to O and B surfaces. expensive, require more tooth reduction, and allow only for minimal crimping.

129 Pre-veneered: metal with esthetic facing Ram D et al. Long-term clinical performance of esthetic primary molar crowns. At the 4 year evaluation all the esthetic crowns (n=10) showed chipping of the esthetic facing, with poor esthetic appearance. Pediatr Dent 25:582-4, 2003

130 Composite crowns

131 Composite crowns

132 SSC in primary teeth: topics 1. Introduction: crown types, definition, rationale, indications and contraindications. 2. Characteristics, advantages and disadvantages. 3. Clinical procedures: tooth preparation, crown adaptation and cementation. 4. Summary and conclusions.

133 Summary and conclusions SSCs represent a long term, easy one appointment full coverage restorations of primary molars. The tooth preparation and adaptation are relatively easy, in most cases. Durable and cost effective ($34 for 5).

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